TPS735xx www.ti.com SBVS087K - JUNE 2008 - REVISED AUGUST 2013 500mA, Low Quiescent Current, Ultra-Low Noise, High PSRR Low-Dropout Linear Regulator Check for Samples: TPS735xx FEATURES APPLICATIONS * * * * * * * 1 2 * * * * * * * * 500mA Low Dropout Regulator with EN Low IQ: 46A Multiple Output Voltage Versions Available: - Fixed Outputs of 1.0V to 4.3V Using Innovative Factory EEPROM Programming - Adjustable Outputs from 1.25V to 6.0V High PSRR: 60dB at 1kHz Ultra-low Noise: 28VRMS Fast Start-Up Time: 45s Stable with a Low-ESR, 2.0F Typical Output Capacitance Excellent Load/Line Transient Response 2% Overall Accuracy (Load/Line/Temp, VOUT > 2.2V) Very Low Dropout: 280mV at 500mA 2mm x 2mm SON-6 and 3mm x 3mm SON-8 Packages DRB PACKAGE 3mm x 3mm SON (TOP VIEW) OUT 1 N/C 2 NR/FB 3 GND 4 8 IN GND 7 N/C 6 N/C 5 EN WiFi, WiMax Printers Cellular Phones, SmartPhones Handheld Organizers, PDAs DESCRIPTION The TPS735xx family of low-dropout (LDO), lowpower linear regulators offers excellent ac performance with very low ground current. High power-supply rejection ratio (PSRR), low noise, fast start-up, and excellent line and load transient response are provided while consuming a very low 46A (typical) ground current. The TPS735xx is stable with ceramic capacitors and uses an advanced BiCMOS fabrication process to yield a typical dropout voltage of 250mV at 500mA output. The TPS735xx uses a precision voltage reference and feedback loop to achieve overall accuracy of 2% (VOUT > 2.2V) over all load, line, process, and temperature variations. It is fully specified from TJ = -40C to +125C and is offered in low-profile, 2mm x 2mm SON and 3mm x 3mm SON packages that are ideal for wireless handsets, printers, and WLAN cards. DRV PACKAGE 2mm x 2mm SON (TOP VIEW) OUT 1 NR/FB 2 GND 3 GND 6 IN 5 N/C 4 EN 1 2 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright (c) 2008-2013, Texas Instruments Incorporated TPS735xx SBVS087K - JUNE 2008 - REVISED AUGUST 2013 www.ti.com This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. ORDERING INFORMATION (1) PRODUCT TPS735xx yyy z (1) (2) VOUT (2) XX is nominal output voltage (for example, 28 = 2.8V, 285 = 2.85V, 01 = Adjustable). YYY is package designator. Z is package quantity. For the most current package and ordering information see the Package Option Addendum at the end of this document, or see the TI website at www.ti.com. Output voltages from 1.0V to 3.6V in 50mV increments are available through the use of innovative factory EEPROM programming; minimum order quantities may apply. Contact factory for details and availability. ABSOLUTE MAXIMUM RATINGS Over operating temperature range (unless otherwise noted). (1) PARAMETER TPS735xx UNIT VIN range -0.3 to +7.0 V VEN range -0.3 to VIN +0.3 V VOUT range -0.3 to VIN +0.3 V -0.3 to VFB (TYP) +0.3 V VFB range Peak output current Continuous total power dissipation Internally limited See Thermal Information table Junction temperature range, TJ -55 to +150 Storage temperature range , TSTG C -55 to +150 C ESD rating, HBM 2 kV ESD rating, CDM 500 V (1) 2 Stresses above these ratings may cause permanent damage. Exposure to absolute maximum conditions for extended periods may degrade device reliability. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those specified is not implied. Submit Documentation Feedback Copyright (c) 2008-2013, Texas Instruments Incorporated TPS735xx www.ti.com SBVS087K - JUNE 2008 - REVISED AUGUST 2013 THERMAL INFORMATION TPS735xx (2) THERMAL METRIC (1) JA Junction-to-ambient thermal resistance (4) JCtop Junction-to-case (top) thermal resistance (5) (6) DRB DRV (3) 8 PINS 6 PINS 47.8 50.2 83 59 JB Junction-to-board thermal resistance N/A N/A JT Junction-to-top characterization parameter (7) 2.1 0.1 JB Junction-to-board characterization parameter (8) 17.8 30.1 JCbot Junction-to-case (bottom) thermal resistance (9) 12.1 8.3 (1) (2) (3) (4) (5) (6) (7) (8) (9) UNITS C/W For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953A. Thermal data for the DRB, DCQ, and DRV packages are derived by thermal simulations based on JEDEC-standard methodology as specified in the JESD51 series. The following assumptions are used in the simulations: (a) i. DRB: The exposed pad is connected to the PCB ground layer through a 2x2 thermal via array. . ii. DRV: The exposed pad is connected to the PCB ground layer through a 2x2 thermal via array. Due to size limitation of thermal pad, 0.8-mm pitch array is used which is off the JEDEC standard. (b) i. DRB: The top and bottom copper layers are assumed to have a 20% thermal conductivity of copper representing a 20% copper coverage. . ii DRV: The top and bottom copper layers are assumed to have a 20% thermal conductivity of copper representing a 20% copper coverage. (c) These data were generated with only a single device at the center of a JEDEC high-K (2s2p) board with 3in x 3in copper area. To understand the effects of the copper area on thermal performance, see the Power Dissipation and Estimating Junction Temperature sections of this data sheet. Power dissipation may limit operating range. The junction-to-ambient thermal resistance under natural convection is obtained in a simulation on a JEDEC-standard, high-K board, as specified in JESD51-7, in an environment described in JESD51-2a. The junction-to-case (top) thermal resistance is obtained by simulating a cold plate test on the top of the package. No specific JEDECstandard test exists, but a close description can be found in the ANSI SEMI standard G30-88. The junction-to-board thermal resistance is obtained by simulating in an environment with a ring cold plate fixture to control the PCB temperature, as described in JESD51-8. The junction-to-top characterization parameter, JT, estimates the junction temperature of a device in a real system and is extracted from the simulation data to obtain JA using a procedure described in JESD51-2a (sections 6 and 7). The junction-to-board characterization parameter, JB, estimates the junction temperature of a device in a real system and is extracted from the simulation data to obtain JA using a procedure described in JESD51-2a (sections 6 and 7). The junction-to-case (bottom) thermal resistance is obtained by simulating a cold plate test on the exposed (power) pad. No specific JEDEC standard test exists, but a close description can be found in the ANSI SEMI standard G30-88. Copyright (c) 2008-2013, Texas Instruments Incorporated Submit Documentation Feedback 3 TPS735xx SBVS087K - JUNE 2008 - REVISED AUGUST 2013 www.ti.com ELECTRICAL CHARACTERISTICS Over operating temperature range (TJ = -40C to +125C), VIN = VOUT(TYP) + 0.5V or 2.7V, whichever is greater; IOUT = 1mA, VEN = VIN, COUT = 2.2F, CNR = 0.01F, unless otherwise noted. For TPS73501, VOUT = 3.0V. Typical values are at TJ = +25C. PARAMETER TEST CONDITIONS VIN Input voltage range (1) VFB Internal reference (TPS73501) Output voltage range (TPS73501) VOUT Output accuracy 1.184 6.0 V +1.0 % DRB package over VIN, IOUT, Temp VOUT + 0.3V VIN VOUT > 6.5V 1mA IOUT 500mA, VOUT > 2.2V -2.0 1.0 +2.0 % VOUT + 0.3V VIN 6.5V 1mA IOUT 500mA, VOUT 2.2V -3.0 1.0 +3.0 % VOUT + 0.3V VIN VOUT + 3.0V, VIN 6.5V 1mA IOUT 500mA, VOUT > 2.2V -2.0 1.0 +2.0 % VOUT + 0.3V VIN VOUT + 3.0V, VIN 6.5V 1mA IOUT 500mA, VOUT 2.2V -3.0 1.0 +3.0 % Output accuracy (1) VOUT(NOM) + 0.3V VIN 6.5V Load regulation 500A IOUT 500mA VDO Dropout voltage (2) (VIN = VOUT(NOM) - 0.1V) IOUT = 500mA ICL Output current limit VOUT = 0.9 x VOUT(NOM) VIN = VOUT(NOM) + 0.9V, VIN 2.7V IGND Ground pin current 500A IOUT 500mA ISHDN Shutdown current (IGND) VEN 0.4V 800 Feedback pin current (TPS73501) Power-supply rejection ratio VIN = 3.85V, VOUT = 2.85V, CNR = 0.01F, IOUT = 100mA VEN(HI) Enable high (enabled) Enable low (shutdown) IEN(HI) 4 Enable pin current, enabled TSD Thermal shutdown temperature TJ Operating junction temperature UVLO (1) (2) Startup time, VOUT= 0% to 90% VOUT = 2.85V, RL = 14, COUT = 2.2F 0.02 %/V 0.005 %/mA 280 500 mV 1170 1720 mA 45 65 A 0.15 1.0 A 0.5 A -0.5 f = 100Hz 60 dB f = 1kHz 56 dB f = 10kHz 41 dB f = 100kHz Output noise voltage BW = 10Hz to 100kHz, VOUT = 2.8V VEN(LO) V VFB VOUT%/ IOUT TSTR V 1.232 -1.0 Line regulation (1) VN UNIT 6.5 TJ = +25C VOUT%/ VIN PSRR 1.208 MAX Nominal DRV package over VIN, IOUT, Temp IFB TYP 2.7 VOUT VOUT MIN 28 dB CNR = 0.01F 11 x VOUT VRMS CNR = none 95 x VOUT VRMS CNR = none 45 s CNR = 0.001F 45 s CNR = 0.01F 50 s CNR = 0.047F 50 s 1.2 VIN 0 0.4 V 1.0 A VEN = VIN = 6.5V 0.03 Shutdown, temperature increasing 165 Reset, temperature decreasing 145 -40 Under-voltage lock-out VIN rising Hysteresis VIN falling 1.90 C C +125 2.20 70 V 2.65 C V mV Minimum VIN = VOUT + VDO or 2.7V, whichever is greater. VDO is not measured for devices with VOUT(NOM) < 2.8V because minimum VIN = 2.7V. Submit Documentation Feedback Copyright (c) 2008-2013, Texas Instruments Incorporated TPS735xx www.ti.com SBVS087K - JUNE 2008 - REVISED AUGUST 2013 DEVICE INFORMATION FUNCTIONAL BLOCK DIAGRAMS IN OUT IN OUT 400W 400W 2mA Current Limit Thermal Shutdown EN 3.3MW Current Limit Overshoot Detect Overshoot Detect Thermal Shutdown EN UVLO UVLO Quickstart 1.208V (1) Bandgap 1.208V Bandgap NR 500kW FB 500kW GND GND NOTE (1): Fixed voltage versions between 1.0V to 1.2V have a 1.0V bandgap circuit instead of a 1.208V bandgap circuit. Figure 1. Fixed Voltage Versions Figure 2. Adjustable Voltage Versions PIN CONFIGURATIONS DRB PACKAGE 3mm x 3mm SON-6 (TOP VIEW) OUT 1 N/C 2 NR/FB 3 GND 4 DRB PACKAGE 3mm x 3mm SON-6 (TOP VIEW) OUT 1 N/C 2 NR/FB 3 GND 4 8 IN 7 N/C GND 6 N/C 5 EN DRV PACKAGE 2mm x 2mm SON-6 (TOP VIEW) 8 IN GND 7 N/C OUT 1 6 N/C 5 EN NR/FB 2 GND 3 Copyright (c) 2008-2013, Texas Instruments Incorporated GND 6 IN 5 N/C 4 EN Submit Documentation Feedback 5 TPS735xx SBVS087K - JUNE 2008 - REVISED AUGUST 2013 www.ti.com PIN DESCRIPTIONS TPS735xx 6 NAME DRV DRB IN 6 8 Input supply. GND 3, Pad 4 Ground. The pad must be tied to GND. EN 4 5 Driving the enable pin (EN) high turns on the regulator. Driving this pin low puts the regulator into shutdown mode. EN can be connected to IN if not used. NR 2 3 Fixed voltage versions only; connecting an external capacitor to this pin bypasses noise generated by the internal bandgap. This allows output noise to be reduced to very low levels. FB 2 3 Adjustable version only; this is the input to the control loop error amplifier, and is used to set the output voltage of the device. OUT 1 1 Output of the regulator. A small capacitor (total typical capacitance 2.0F ceramic) is needed from this pin to ground to assure stability. N/C 5 2, 6, 7 Submit Documentation Feedback DESCRIPTION Not internally connected. This pin must either be left open, or tied to GND. Copyright (c) 2008-2013, Texas Instruments Incorporated TPS735xx www.ti.com SBVS087K - JUNE 2008 - REVISED AUGUST 2013 TYPICAL CHARACTERISTICS Over operating temperature range (TJ= -40C to +125C), VIN = VOUT(TYP) + 0.5V or 2.7V, whichever is greater; IOUT = 1mA, VEN = VIN,COUT = 2.2F, CNR = 0.01F, unless otherwise noted. For TPS73501, VOUT = 2.8V. The TPS73525 is used as the evaluation target of the fixed-voltage option in this datasheet. However, this voltage option may not be released. Check the Package Option Addendum at the end of this document for the availability of the 2.5V version.Typical values are at TJ = +25C. TPS73501 LINE REGULATION 0.5 0.3 TJ = -40C 0.2 TJ = 0C 0.1 0 -0.1 TJ = +25C -0.2 TJ = +85C -0.3 0.3 0.1 0 -0.1 -0.2 TJ = +85C -0.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 3.0 6.5 3.5 4.5 5.0 VIN (V) Figure 3. Figure 4. 5.5 6.0 6.5 TPS73525 LOAD REGULATION 2.55 Y-axis range is 2% of 2.8V 2.85 4.0 VIN (V) TPS73501 LOAD REGULATION 2.86 Y-axis range is 2% of 2.5V 2.54 2.84 2.53 2.83 TJ = -40C 2.81 2.80 2.79 VOUT (V) 2.52 2.82 VOUT (V) TJ = +25C TJ = +125C -0.4 -0.5 TJ = +85C 2.78 2.77 2.51 2.47 2.46 2.74 2.45 50 TJ = -40C 2.49 2.75 0 TJ = 0C 2.50 2.48 TJ = +125C 2.76 TJ = +25C TJ = +125C 0 100 150 200 250 300 350 400 450 500 50 TJ = +85C 100 150 200 250 300 350 400 450 500 Load (mA) Load (mA) Figure 5. Figure 6. TPS73525 GROUND PIN CURRENT vs OUTPUT CURRENT TPS73525 GROUND PIN CURRENT (DISABLE) vs TEMPERATURE 60 TJ = +25C 50 500 TJ = +125C VEN = 0.4V 450 TJ = +85C 400 350 TJ = -40C 30 TJ = 0C 20 IGND (na) 40 IGND (mA) TJ = 0C TJ = -40C 0.2 -0.3 TJ = +125C -0.4 IOUT = 100mA 0.4 Change in VOUT (%) 0.4 Change in VOUT (%) TPS73525 LINE REGULATION 0.5 IOUT = 100mA 300 250 VIN = 3.3V 200 VIN = 5.0V 150 VIN = 6.5V 100 10 50 0 0 0 50 100 150 200 250 300 350 400 450 500 IOUT (mA) Figure 7. Copyright (c) 2008-2013, Texas Instruments Incorporated -40 -25 -10 5 20 35 50 65 80 95 110 125 TJ (C) Figure 8. Submit Documentation Feedback 7 TPS735xx SBVS087K - JUNE 2008 - REVISED AUGUST 2013 www.ti.com TYPICAL CHARACTERISTICS (continued) Over operating temperature range (TJ= -40C to +125C), VIN = VOUT(TYP) + 0.5V or 2.7V, whichever is greater; IOUT = 1mA, VEN = VIN,COUT = 2.2F, CNR = 0.01F, unless otherwise noted. For TPS73501, VOUT = 2.8V. The TPS73525 is used as the evaluation target of the fixed-voltage option in this datasheet. However, this voltage option may not be released. Check the Package Option Addendum at the end of this document for the availability of the 2.5V version.Typical values are at TJ = +25C. TPS73501 DROPOUT VOLTAGE vs OUTPUT CURRENT POWER-SUPPLY RIPPLE REJECTION vs FREQUENCY (VIN - VOUT = 1.0V) 90 400 TJ = +125C 350 TJ = +25C 250 200 TJ = 0C 150 10 0 0 50 IOUT = 500mA COUT = 2.2mF CNR = 0.01mF 10 100 150 200 250 300 350 400 450 500 100 IOUT = 200mA 10k 1k 100k 10M 1M IOUT (mA) Frequency (Hz) Figure 9. Figure 10. POWER-SUPPLY RIPPLE REJECTION vs FREQUENCY (VIN - VOUT = 0.5V) POWER-SUPPLY RIPPLE REJECTION vs FREQUENCY (VIN - VOUT = 0.3V) 80 90 80 IOUT = 1mA 70 IOUT = 200mA 60 IOUT = 100mA 50 40 30 0 IOUT = 200mA 60 IOUT = 100mA 50 40 30 20 10 IOUT = 1mA 70 PSRR (dB) PSRR (dB) 40 50 90 20 COUT = 2.2mF CNR = 0.01mF 10 100 IOUT = 500mA IOUT = 250mA 10k 1k COUT = 10mF CNR = 0.01mF 10 0 100k 1M 10M 10 100 IOUT = 200mA IOUT = 500mA 10k 1k 100k Frequency (Hz) Frequency (Hz) Figure 11. Figure 12. TPS73525 TOTAL NOISE vs CNR 140 Total Noise (mVRMS) 80 60 40 20 15 10 5 20 0 IOUT = 1mA CNR = 0.01mF 0 0.1 1 10 0 5 10 15 CNR (nF) COUT (mF) Figure 13. Figure 14. Submit Documentation Feedback 10M 25 100 0.01 1M TPS73525 TOTAL NOISE vs COUT 30 IOUT = 1mA COUT = 2.2mF 120 Total Noise (mVRMS) IOUT = 100mA 50 20 0 8 IOUT = 250mA 60 30 TJ = -40C 100 IOUT = 1mA 70 PSRR (dB) 300 VDO (mV) 80 TJ = +85C 20 25 Copyright (c) 2008-2013, Texas Instruments Incorporated TPS735xx www.ti.com SBVS087K - JUNE 2008 - REVISED AUGUST 2013 TYPICAL CHARACTERISTICS (continued) Over operating temperature range (TJ= -40C to +125C), VIN = VOUT(TYP) + 0.5V or 2.7V, whichever is greater; IOUT = 1mA, VEN = VIN,COUT = 2.2F, CNR = 0.01F, unless otherwise noted. For TPS73501, VOUT = 2.8V. The TPS73525 is used as the evaluation target of the fixed-voltage option in this datasheet. However, this voltage option may not be released. Check the Package Option Addendum at the end of this document for the availability of the 2.5V version.Typical values are at TJ = +25C. TPS73525 TURN-ON RESPONSE (VIN = VEN) TPS73525 EN RESPONSE OVER STABLE VIN 3.5 3.5 3.0 COUT = 2.2mF 3.0 VOUT 2.5 2.0 1.5 COUT = 10mF 1.0 VOUT 2.0 1.5 1.0 0.5 0.5 0 0 COUT = 10mF -0.5 -0.5 10ms/div 10ms/div Figure 15. Figure 16. TPS73525 POWER-UP/POWER-DOWN (VIN = VEN) 7.0 TPS73525 LOAD TRANSIENT RESPONSE RL = 5W 6.0 VIN = 3.0V COUT = 470mF OSCON 200mV/div COUT = 10mF VIN = EN VOUT 200mV/div 5.0 Volts (V) VEN COUT = 2.2mF Voltage (V) Voltage (V) 2.5 VEN VOUT 4.0 COUT = 2.2mF 200mV/div 3.0 2.0 VOUT 1.0 500mA 0 500mA/div IOUT 1mA -1.0 10ms/div 10ms/div Figure 17. Figure 18. TPS73525 LINE TRANSIENT RESPONSE COUT = 470mF OSCON 50mV/div COUT =V10 mF OUT 50mV/div COUT = 2.2mF 50mV/div VOUT VOUT VOUT 4V 0.5V/div 3V VIN 10ms/div Figure 19. Copyright (c) 2008-2013, Texas Instruments Incorporated Submit Documentation Feedback 9 TPS735xx SBVS087K - JUNE 2008 - REVISED AUGUST 2013 www.ti.com APPLICATION INFORMATION The TPS735xx family of LDO regulators combines the high performance required of many RF and precision analog applications with ultra-low current consumption. High PSRR is provided by a high gain, high bandwidth error loop with good supply rejection at very low headroom (VIN - VOUT). Fixed voltage versions provide a noise reduction pin to bypass noise generated by the bandgap reference and to improve PSRR while a quick-start circuit fast-charges this capacitor at startup. The combination of high performance and low ground current also make the TPS735xx an excellent choice for portable applications. All versions have thermal and overcurrent protection and are fully specified from -40C to +125C. Figure 20 shows the basic circuit connections for fixed voltage models. Figure 21 gives the connections for the adjustable output version (TPS73501). R1 and R2 can be calculated for any output voltage using the formula in Figure 21. Optional input capacitor. May improve source impedance, noise, or PSRR. VIN IN VOUT OUT TPS735xx EN GND VEN 2.2mF Ceramic NR Optional bypass capacitor to reduce output noise and increase PSRR. Figure 20. Typical Application Circuit for Fixed Voltage Versions Optional input capacitor. May improve source impedance, noise, or PSRR. VIN IN VOUT = R2 GND 1.208 VOUT OUT TPS73501 EN (R1 + R2) R1 FB CFB 2.2mF Ceramic R2 VEN Figure 21. Typical Application Circuit for Adjustable Voltage Versions space space 10 Submit Documentation Feedback Input and Output Capacitor Requirements Although an input capacitor is not required for stability, it is good analog design practice to connect a 0.1F to 1F low equivalent series resistance (ESR) capacitor across the input supply near the regulator. The ground of this capacitor should be connected as close as the ground of output capacitor; a capacitor value of 0.1F is enough in this condition. When it is difficult to place these two ground points close together, a 1F capacitor is recommended. This capacitor counteracts reactive input sources and improves transient response, noise rejection, and ripple rejection. A higher-value capacitor may be necessary if large, fast rise-time load transients are anticipated, or if the device is located several inches from the power source. If source impedance is not sufficiently low, a 0.1F input capacitor may be necessary to ensure stability. The TPS735xx is designed to be stable with standard ceramic output capacitors of values 2.2F or larger. X5R and X7R type capacitors are best because they have minimal variation in value and ESR over temperature. Maximum ESR of the output capacitor should be < 1.0, so output capacitor type should be either ceramic or conductive polymer electrolytic. Feedback Capacitor Requirements (TPS73501 only) The feedback capacitor, CFB, shown in Figure 21 is required for stability. For a parallel combination of R1 and R2 equal to 250k, any value from 3pF to 1nF can be used. Fixed voltage versions have an internal 30pF feedback capacitor that is quick-charged at start-up. The adjustable version does not have this quick-charge circuit, so values below 5pF should be used to ensure fast startup; values above 47pF can be used to implement an output voltage soft-start. Larger value capacitors also improve noise slightly. The TPS73501 is stable in unity-gain configuration (OUT tied to FB) without CFB. Output Noise In most LDOs, the bandgap is the dominant noise source. If a noise reduction capacitor (CNR) is used with the TPS735xx, the bandgap does not contribute significantly to noise. Instead, noise is dominated by the output resistor divider and the error amplifier input. To minimize noise in a given application, use a 0.01F noise reduction capacitor; for the adjustable version, smaller value resistors in the output resistor divider reduce noise. A parallel combination that gives 2A of divider current has the same noise performance as a fixed voltage version. To further Copyright (c) 2008-2013, Texas Instruments Incorporated TPS735xx www.ti.com optimize noise, equivalent series resistance of the output capacitor can be set to approximately 0.2. This configuration maximizes phase margin in the control loop, reducing total output noise by up to 10%. Noise can be referred to the feedback point (FB pin) such that with CNR = 0.01F, total noise is given approximately by Equation 1: 11mVRMS VN = x VOUT V (1) The TPS73501 adjustable version does not have the noise-reduction pin available, so ultra-low noise operation is not possible. Noise can be minimized according to the above recommendations. Board Layout Recommendations to Improve PSRR and Noise Performance To improve ac performance such as PSRR, output noise, and transient response, it is recommended that the board be designed with separate ground planes for VIN and VOUT, with each ground plane connected only at the GND pin of the device. In addition, the ground connection for the bypass capacitor should connect directly to the GND pin of the device. SBVS087K - JUNE 2008 - REVISED AUGUST 2013 As with any linear regulator, PSRR and transient response are degraded as (VIN - VOUT) approaches dropout. This effect is shown in the Typical Characteristics section. Startup and Noise Reduction Capacitor Fixed voltage versions of the TPS735xx use a quickstart circuit to fast-charge the noise reduction capacitor, CNR, if present (see the Functional Block Diagrams). This architecture allows the combination of very low output noise and fast start-up times. The NR pin is high impedance so a low leakage CNR capacitor must be used; most ceramic capacitors are appropriate in this configuration. A high-quality, COGtype (NPO) dielectric ceramic capacitor is recommended for CNR when used in environments where abrupt changes in temperature can occur. Note that for fastest startup, VIN should be applied first, then the enable pin (EN) driven high. If EN is tied to IN, startup is somewhat slower. Refer to the Typical Characteristics section. The quick-start switch is closed for approximately 135s. To ensure that CNR is fully charged during the quick-start time, a 0.01F or smaller capacitor should be used. Transient Response Internal Current Limit The TPS735xx internal current limit helps protect the regulator during fault conditions. During current limit, the output sources a fixed amount of current that is largely independent of output voltage. For reliable operation, the device should not be operated in current limit for extended periods of time. The PMOS pass element in the TPS735xx has a built-in body diode that conducts current when the voltage at OUT exceeds the voltage at IN. This current is not limited, so if extended reverse voltage operation is anticipated, external limiting may be appropriate. Shutdown The enable pin (EN) is active high and is compatible with standard and low voltage TTL-CMOS levels. When shutdown capability is not required, EN can be connected to IN. Dropout Voltage The TPS735xx uses a PMOS pass transistor to achieve low dropout. When (VIN - VOUT) is less than the dropout voltage (VDO), the PMOS pass device is in its linear region of operation and the input-to-output resistance is the RDS, ON of the PMOS pass element. Because the PMOS device behaves like a resistor in dropout, VDO approximately scales with output current. Copyright (c) 2008-2013, Texas Instruments Incorporated As with any regulator, increasing the size of the output capacitor reduces over/undershoot magnitude but increases duration of the transient response. In the adjustable version, adding CFB between OUT and FB improves stability and transient response. The transient response of the TPS735xx is enhanced by an active pull-down that engages when the output overshoots by approximately 5% or more when the device is enabled. When enabled, the pull-down device behaves like a 400 resistor to ground. Undervoltage Lock-Out (UVLO) The TPS735xx utilizes an undervoltage lock-out circuit to keep the output shut off until internal circuitry is operating properly. The UVLO circuit has a de-glitch feature so that it typically ignores undershoot transients on the input if they are less than 50s duration. Minimum Load The TPS735xx is stable and well-behaved with no output load. To meet the specified accuracy, a minimum load of 500A is required. Below 500A at junction temperatures near +125C, the output can drift up enough to cause the output pull-down to turn on. The output pull-down limits voltage drift to 5% typically but ground current could increase by Submit Documentation Feedback 11 TPS735xx SBVS087K - JUNE 2008 - REVISED AUGUST 2013 www.ti.com approximately 50A. In typical applications, the junction cannot reach high temperatures at light loads because there is no appreciable dissipated power. The specified ground current would then be valid at no load in most applications. Power dissipation depends on input voltage and load conditions. Power dissipation is equal to the product of the output current time the voltage drop across the output pass element, as shown in Equation 2: P D + VIN*V OUT @ I OUT (2) Thermal Information Note: When the device is used in a condition of higher input and lower output voltages with the DRV and DRB packages, PD exceeds the package rating at room temperature. This equation shows an example of the DRB package: PD = (6.5V - 1.0V) x 500mA = 2.75W, which is greater than 2.5W at +25C. Thermal protection disables the output when the junction temperature rises to approximately +165C, allowing the device to cool. When the junction temperature cools to approximately +145C the output circuitry is again enabled. Depending on power dissipation, thermal resistance, and ambient temperature, the thermal protection circuit may cycle on and off. This cycling limits the dissipation of the regulator, protecting it from damage as a result of overheating. Any tendency to activate the thermal protection circuit indicates excessive power dissipation or an inadequate heatsink. For reliable operation, junction temperature should be limited to +125C maximum. To estimate the margin of safety in a complete design (including heatsink), increase the ambient temperature until the thermal protection is triggered; use worst-case loads and signal conditions. For good reliability, thermal protection should trigger at least +35C above the maximum expected ambient condition of your particular application. This configuration produces a worst-case junction temperature of +125C at the highest expected ambient temperature and worst-case load. The internal protection circuitry of the TPS735xx has been designed to protect against overload conditions. It was not intended to replace proper heatsinking. Continuously running the TPS735xx into thermal shutdown degrades device reliability. Package Mounting Solder pad footprint recommendations for the TPS735xx are available from the Texas Instruments web site at www.ti.com. Power Dissipation The ability to remove heat from the die is different for each package type, presenting different considerations in the PCB layout. The PCB area around the device that is free of other components moves the heat from the device to the ambient air. Performance data for JEDEC low- and high-K boards are given in the Thermal Information table. Using heavier copper increases the effectiveness in removing heat from the device. The addition of plated through-holes to heat-dissipating layers also improves the heatsink effectiveness. 12 Submit Documentation Feedback Power dissipation can be minimized and greater efficiency can be achieved by using the lowest possible input voltage necessary to achieve the required output voltage regulation. On both SON (DRB) and SON (DRV) packages, the primary conduction path for heat is through the exposed pad to the printed circuit board (PCB). The pad can be connected to ground or be left floating; however, it should be attached to an appropriate amount of copper PCB area to ensure the device does not overheat. The maximum junction-to-ambient thermal resistance depends on the maximum ambient temperature, maximum device junction temperature, and power dissipation of the device and can be calculated using Equation 3: ()125OC * T A) R qJA + PD (3) Knowing the maximum RJA, the minimum amount of PCB copper area needed for appropriate heatsinking can be estimated using Figure 22. 160 DRV DRB 140 120 qJA (C/W) Thermal Protection 100 80 60 40 20 0 0 Note: 1 2 4 5 7 3 6 Board Copper Area (in2) 8 9 10 JA value at board size of 9in2 (that is, 3in x 3in) is a JEDEC standard. Figure 22. JA vs Board Size Copyright (c) 2008-2013, Texas Instruments Incorporated TPS735xx www.ti.com SBVS087K - JUNE 2008 - REVISED AUGUST 2013 NOTE: When the device is mounted on an application PCB, it is strongly recommended to use JT and JB, as explained in the Estimating Junction Temperature section. ESTIMATING JUNCTION TEMPERATURE Using the thermal metrics JT and JB, as shown in the Thermal Information table, the junction temperature can be estimated with corresponding formulas (given in Equation 4). For backwards compatibility, an older JC,Top parameter is listed as well. YJT: TJ = TT + YJT * PD YJB: TJ = TB + YJB * PD (4) Where PD is the power dissipation shown by Equation 2, TT is the temperature at the center-top of the IC package, and TB is the PCB temperature measured 1mm away from the IC package on the PCB surface (as Figure 24 shows). NOTE: Both TT and TB can be measured on actual application boards using a thermo-gun (an infrared thermometer). By looking at Figure 23, the new thermal metrics (JT and JB) have very little dependency on board size. That is, using JT or JB with Equation 4 is a good way to estimate TJ by simply measuring TT or TB, regardless of the application board size. 35 30 YJT and YJB (C/W) Figure 22 illustrates the variation of JA as a function of ground plane copper area in the board. It is intended only as a guideline to demonstrate the effects of heat spreading in the ground plane and should not be used to estimate actual thermal performance in real application environments. 25 DRV Y JB DRB 20 15 10 DRV Y JT DRB 5 0 0 1 2 3 4 5 6 7 8 9 10 Board Copper Area (in2) Figure 23. JT and JB vs Board Size For a more detailed discussion of why TI does not recommend using JC(top) to determine thermal characteristics, refer to application report SBVA025, Using New Thermal Metrics, available for download at www.ti.com. For further information, refer to application report SPRA953, IC Package Thermal Metrics, also available on the TI website. For more information about measuring TT and TB, see the application note SBVA025, Using New Thermal Metrics, available for download at www.ti.com. TT on top of IC TB on PCB surface TT on top of IC TB on PCB surface 1mm 1mm See note (1) (a) Example DRB (SON) Package Measurement (1) (b) Example DRV (SON) Package Measurement Power dissipation may limit operating range. Check Thermal Information table. Figure 24. Measuring Points for TT and TB Copyright (c) 2008-2013, Texas Instruments Incorporated Submit Documentation Feedback 13 TPS735xx SBVS087K - JUNE 2008 - REVISED AUGUST 2013 www.ti.com REVISION HISTORY NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision J (May 2011) to Revision K * Page Added last sentence to first paragraph of Startup and Noise Reduction Capacitor section ............................................... 11 Changes from Revision I (April, 2011) to Revision J Page * Replaced the Dissipation Ratings table with the Thermal Information table ........................................................................ 3 * Revised conditions for Typical Characteristics to include statement about TPS73525 device availability .......................... 7 * Updated Power Dissipation section .................................................................................................................................... 12 * Added Estimating Junction Temperature section ............................................................................................................... 13 Changes from Revision H (November, 2009) to Revision I * 14 Page Corrected typo in Electrical Characteristics table for VOUT specification, DRV package test conditions, VOUT 2.2V ......... 4 Submit Documentation Feedback Copyright (c) 2008-2013, Texas Instruments Incorporated PACKAGE OPTION ADDENDUM www.ti.com 13-Nov-2013 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Op Temp (C) Device Marking (4/5) TPS73501DRBR ACTIVE SON DRB 8 3000 Green (RoHS & no Sb/Br) CU NIPDAU | Call TI Level-2-260C-1 YEAR -40 to 125 CBK TPS73501DRBT ACTIVE SON DRB 8 250 Green (RoHS & no Sb/Br) CU NIPDAU | Call TI Level-2-260C-1 YEAR -40 to 125 CBK TPS73501DRVR ACTIVE SON DRV 6 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM -40 to 125 SDR TPS73501DRVT ACTIVE SON DRV 6 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM -40 to 125 SDR TPS73512DRBR ACTIVE SON DRB 8 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR -40 to 125 QTT TPS73512DRBT ACTIVE SON DRB 8 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR -40 to 125 QTT TPS73515DRBR ACTIVE SON DRB 8 3000 Green (RoHS & no Sb/Br) CU NIPDAU | Call TI Level-2-260C-1 YEAR -40 to 125 QWH TPS73515DRBT ACTIVE SON DRB 8 250 Green (RoHS & no Sb/Br) CU NIPDAU | Call TI Level-2-260C-1 YEAR -40 to 125 QWH TPS73525DRBR ACTIVE SON DRB 8 3000 Green (RoHS & no Sb/Br) CU NIPDAU | Call TI Level-2-260C-1 YEAR -40 to 125 CBM TPS73525DRBRG4 ACTIVE SON DRB 8 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR -40 to 125 CBM TPS73525DRBT ACTIVE SON DRB 8 250 Green (RoHS & no Sb/Br) CU NIPDAU | Call TI Level-2-260C-1 YEAR -40 to 125 CBM TPS73525DRBTG4 ACTIVE SON DRB 8 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR -40 to 125 CBM TPS73525DRVR ACTIVE SON DRV 6 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM -40 to 125 NSW TPS73525DRVT ACTIVE SON DRV 6 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM -40 to 125 NSW TPS73527DRVR ACTIVE SON DRV 6 3000 Green (RoHS & no Sb/Br) NIPDAU | CU NIPDAU Level-1-260C-UNLIM -40 to 125 RAK TPS73527DRVT ACTIVE SON DRV 6 250 Green (RoHS & no Sb/Br) NIPDAU | CU NIPDAU Level-1-260C-UNLIM -40 to 125 RAK TPS735285DRVR ACTIVE SON DRV 6 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM -40 to 125 RAW Addendum-Page 1 Samples PACKAGE OPTION ADDENDUM www.ti.com Orderable Device 13-Nov-2013 Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Op Temp (C) Device Marking (4/5) TPS735285DRVT ACTIVE SON DRV 6 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM -40 to 125 RAW TPS73533DRBR ACTIVE SON DRB 8 3000 Green (RoHS & no Sb/Br) CU NIPDAU | Call TI Level-2-260C-1 YEAR -40 to 125 CVY TPS73533DRBT ACTIVE SON DRB 8 250 Green (RoHS & no Sb/Br) CU NIPDAU | Call TI Level-2-260C-1 YEAR -40 to 125 CVY TPS73533DRVR ACTIVE SON DRV 6 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM -40 to 125 CVY TPS73533DRVT ACTIVE SON DRV 6 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM -40 to 125 CVY (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. (4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device. (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Device Marking for that device. (6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish value exceeds the maximum column width. Addendum-Page 2 Samples PACKAGE OPTION ADDENDUM www.ti.com 13-Nov-2013 Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. 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Addendum-Page 3 PACKAGE MATERIALS INFORMATION www.ti.com 28-Nov-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing TPS73501DRBR SON DRB 8 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 3000 330.0 12.4 3.3 3.3 1.1 8.0 12.0 Q2 TPS73501DRBT SON DRB 8 250 180.0 12.4 3.3 3.3 1.1 8.0 12.0 Q2 TPS73501DRVR SON DRV 6 3000 179.0 8.4 2.2 2.2 1.2 4.0 8.0 Q2 TPS73501DRVT SON DRV 6 250 179.0 8.4 2.2 2.2 1.2 4.0 8.0 Q2 TPS73512DRBR SON DRB 8 3000 330.0 12.4 3.3 3.3 1.1 8.0 12.0 Q2 TPS73512DRBT SON DRB 8 250 180.0 12.4 3.3 3.3 1.1 8.0 12.0 Q2 TPS73515DRBR SON DRB 8 3000 330.0 12.4 3.3 3.3 1.1 8.0 12.0 Q2 TPS73515DRBT SON DRB 8 250 180.0 12.4 3.3 3.3 1.1 8.0 12.0 Q2 TPS73525DRBR SON DRB 8 3000 330.0 12.4 3.3 3.3 1.1 8.0 12.0 Q2 TPS73525DRBT SON DRB 8 250 180.0 12.4 3.3 3.3 1.1 8.0 12.0 Q2 TPS73525DRVR SON DRV 6 3000 179.0 8.4 2.2 2.2 1.2 4.0 8.0 Q2 TPS73525DRVT SON DRV 6 250 179.0 8.4 2.2 2.2 1.2 4.0 8.0 Q2 TPS73527DRVR SON DRV 6 3000 179.0 8.4 2.2 2.2 1.2 4.0 8.0 Q2 TPS73527DRVR SON DRV 6 3000 180.0 8.4 2.25 2.25 1.0 4.0 8.0 Q2 TPS73527DRVT SON DRV 6 250 179.0 8.4 2.2 2.2 1.2 4.0 8.0 Q2 TPS735285DRVR SON DRV 6 3000 179.0 8.4 2.2 2.2 1.2 4.0 8.0 Q2 TPS735285DRVT SON DRV 6 250 179.0 8.4 2.2 2.2 1.2 4.0 8.0 Q2 TPS73533DRBR SON DRB 8 3000 330.0 12.4 3.3 3.3 1.1 8.0 12.0 Q2 Pack Materials-Page 1 PACKAGE MATERIALS INFORMATION www.ti.com 28-Nov-2013 Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant TPS73533DRBT SON DRB 8 250 180.0 12.4 3.3 3.3 1.1 8.0 12.0 Q2 TPS73533DRVR SON DRV 6 3000 179.0 8.4 2.2 2.2 1.2 4.0 8.0 Q2 TPS73533DRVT SON DRV 6 250 179.0 8.4 2.2 2.2 1.2 4.0 8.0 Q2 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TPS73501DRBR SON DRB 8 3000 367.0 367.0 35.0 TPS73501DRBT SON DRB 8 250 210.0 185.0 35.0 TPS73501DRVR SON DRV 6 3000 203.0 203.0 35.0 TPS73501DRVT SON DRV 6 250 203.0 203.0 35.0 TPS73512DRBR SON DRB 8 3000 367.0 367.0 35.0 TPS73512DRBT SON DRB 8 250 210.0 185.0 35.0 TPS73515DRBR SON DRB 8 3000 367.0 367.0 35.0 TPS73515DRBT SON DRB 8 250 210.0 185.0 35.0 TPS73525DRBR SON DRB 8 3000 367.0 367.0 35.0 TPS73525DRBT SON DRB 8 250 210.0 185.0 35.0 TPS73525DRVR SON DRV 6 3000 203.0 203.0 35.0 TPS73525DRVT SON DRV 6 250 203.0 203.0 35.0 TPS73527DRVR SON DRV 6 3000 203.0 203.0 35.0 TPS73527DRVR SON DRV 6 3000 205.0 200.0 33.0 Pack Materials-Page 2 PACKAGE MATERIALS INFORMATION www.ti.com 28-Nov-2013 Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TPS73527DRVT SON DRV 6 250 203.0 203.0 35.0 TPS735285DRVR SON DRV 6 3000 203.0 203.0 35.0 TPS735285DRVT SON DRV 6 250 203.0 203.0 35.0 TPS73533DRBR SON DRB 8 3000 367.0 367.0 35.0 TPS73533DRBT SON DRB 8 250 210.0 185.0 35.0 TPS73533DRVR SON DRV 6 3000 203.0 203.0 35.0 TPS73533DRVT SON DRV 6 250 203.0 203.0 35.0 Pack Materials-Page 3 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. 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