EVALUATION KIT AVAILABLE MAX8556/MAX8557 General Description The MAX8556/MAX8557 low-dropout linear regulators operate from input voltages as low as 1.425V and are able to deliver up to 4A of continuous output current with a typical dropout voltage of only 100mV. The output voltage is adjustable from 0.5V to VIN - 0.2V. Designed with an internal p-channel MOSFET pass transistor, the MAX8556/MAX8557 maintain a low 800A typical supply current, independent of the load current and dropout voltage. Using a p-channel MOSFET eliminates the need for an additional external supply or a noisy internal charge pump. Other features include a logic-controlled shutdown mode, built-in soft-start, short-circuit protection with foldback current limit, and thermal-overload protection. The MAX8556 features a POK output that transitions high when the regulator output is within 10% of its nominal output voltage. The MAX8557 offers a power-on reset output that transitions high 140ms after the output has achieved 90% of its nominal output voltage. The MAX8556/MAX8557 are available in a 16-pin TQFN 5mm x 5mm package with exposed paddle. Applications Servers and Storage Devices Networking Base Stations Optical Modules Point-of-Load Supplies ATE 4A Ultra-Low-Input-Voltage LDO Regulators Benefits and Features 1.425V to 3.6V Input Voltage Range Guaranteed 4A Output Current 1% Output Accuracy Over Load/Line/Temperature 100mV Dropout at 4A Load (typ) Built-In Soft-Start 800A (typ) Operating Supply Current 150A (max) Shutdown Supply Current Short-Circuit Current Foldback Protection Thermal-Overload Protection 10% Power-OK (MAX8556) 140ms Power-On Reset Output (MAX8557) Fast Transient Response 16-Pin TQFN (5mm x 5mm) Package Typical Operating Circuit VIN 1.425V TO 3.6V OUT IN MAX8556 (MAX8557) EN POK (POR) Ordering Information appears at end of data sheet. 19-3257; Rev 3; 4/17 FB GND N.C. VOUT 0.5V TO VIN - 0.2V MAX8556/MAX8557 4A Ultra-Low-Input-Voltage LDO Regulators Absolute Maximum Ratings IN, EN, POK, POR to GND......................................-0.3V to +4V FB, OUT to GND.........................................-0.3V to (VIN + 0.3V) Output Short-Circuit Duration.....................................Continuous Continuous Power Dissipation (TA = +70C) 16-Pin TQFN (derate 33.3mW/C above +70C) (Note 1)............................................2666.7mW Operating Temperature Range............................ -40C to +85C Junction Temperature.......................................................+150C Storage Temperature Range............................. -65C to +150C Lead Temperature (soldering, 10s).................................. +300C Note 1: Maximum power dissipation is obtained using JEDEC JESD51-5 and JESD51-7 standards. Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Package Information PACKAGE TYPE: 16 TQFN Package Code T1655+3 Outline Number 21-0140 Land Pattern Number 90-0072 For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a "+", "#", or "-" in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. Electrical Characteristics (VEN = VIN = 1.8V, VOUT = 1.5V, IOUT = 2mA, TA = -40C to +105C (MAX8556ETE+) and TA = -40C to +85C (MAX8557ETE+), typical values are at TA = +25C, unless otherwise noted.) (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS 3.600 V IN Input Voltage Range Input Undervoltage Lockout 1.425 VIN rising, 70mV hysteresis 1.30 1.35 1.40 VIN falling 1.23 1.28 1.33 V OUT Output Voltage Range 0.5 Load Regulation IOUT = 2mA to 4A Line Regulation VIN = 1.425V to 3.6V, VOUT = 1.225V Dropout Voltage VIN = 1.425V, IOUT = 4A, VFB = 480mV Regulated Output-Voltage Current Limit VIN = 3.6V, VOUT = 3V, VFB = 460mV 5 Load Capacitance ESR < 50mA (Note 3) 16 FB Threshold Accuracy (Note 4) VOUT = 1.225V to 3V, VIN = VOUT + 0.2V to 3.6V, IOUT = 2mA to 4A 495 FB Input Bias Current VFB = 0.5V, VIN = 3.6V 3.4 0.1 -0.15 V %/A 0 +0.15 %/V 100 200 mV 7 9 A 120 F 500 505 mV 0.001 1 A FB www.maximintegrated.com Maxim Integrated 2 MAX8556/MAX8557 4A Ultra-Low-Input-Voltage LDO Regulators Electrical Characteristics (continued) (VEN = VIN = 1.8V, VOUT = 1.5V, IOUT = 2mA, TA = -40C to +105C (MAX8556ETE+) and TA = -40C to +85C (MAX8557ETE+), typical values are at TA = +25C, unless otherwise noted.) (Note 2) PARAMETER CONDITIONS MIN TYP MAX VIN = 1.425V to 3.6V, VOUT = 1.225V 800 1600 Dropout, VIN = 3.6V, VFB = 480mV 1000 2000 UNITS GND GND Supply Current GND Shutdown Current VIN = 3.6V, EN = GND 150 A A POK FB Power-OK Fault Threshold FB moving out of regulation, VIN = 1.425V to 3.6V, 10mV hysteresis POK Output Voltage, Low VFB = 0.4V or 0.6V, IPOK = 2mA POK Output Current, High VPOK = 3.6V VFB = 0.5 POK Delay Time From FB rising to POK high FB high 540 550 560 FB low 440 450 460 25 mV 25 200 mV 0.001 1 A 50 100 s EN Enable Input Threshold VIN = 1.425V to 3.6V Enable Input Bias Current VEN = 0V or 3.6V EN rising EN falling 1.25 0.4 -1 +1 V A THERMAL SHUTDOWN Thermal-Shutdown Threshold Output on and off TJ rising +160 TJ falling +115 C POR FB Power-On Reset Fault Threshold FB falling, VIN = 1.425V to 3.6V, 10mV hysteresis POR Output Voltage, Low POR Output Current, High POR Rising Delay Time FB rising to POR high impedance 440 450 460 mV VFB = 0.4V, IPOR = 2mA 25 200 mV VPOR = 3.6V, VFB = 0.5V 0.001 1 A 140 200 ms 100 SOFT-START Soft-Start Time 100 s Note 2: Specifications to TA = -40C are guaranteed by design and not production tested. Note 3: Guaranteed by design, not production tested. Note 4: Minimum supply voltage for output accuracy must be at least 1.425V. www.maximintegrated.com Maxim Integrated 3 MAX8556/MAX8557 4A Ultra-Low-Input-Voltage LDO Regulators Typical Operating Characteristics (VEN = VIN = +1.8V, VOUT = +1.5V, IOUT = 4A, COUT = 20F, CIN = 20F, and TA = +25C, unless otherwise noted.) TA = -85C TA = -25C TA = -40C 1.40 1.35 1.30 TA = +25C 1.5015 1.5010 1.5005 TA = +85C 1.5000 1.4995 1.4990 1.4985 1.8 1.2 2.4 TA = -40C 1.4980 ILOAD = 2A 3.0 3.6 1.4975 1 0 INPUT VOLTAGE (V) GND CURRENT vs. INPUT VOLTAGE ILOAD = 4A 900 600 500 ILOAD = 0A 400 300 500 400 100 1.2 2.4 3.6 ILOAD = 0A 300 100 0 ILOAD = 2A 600 200 90 0 -40 -15 10 35 60 INPUT VOLTAGE (V) TEMPERATURE (C) DROPOUT VOLTAGE vs. LOAD CURRENT LINE-TRANSIENT RESPONSE 80 DROPOUT VOLTAGE (mV) 700 200 0 4 800 GND CURRENT (A) ILOAD = 2A 700 MAX8556 toc05 GND CURRENT (A) 800 3 GND CURRENT vs. TEMPERATURE 900 MAX8556 toc03 1000 2 LOAD CURRENT (A) 70 MAX8556 toc04 1.45 OUTPUT VOLTAGE vs. LOAD CURRENT 1.5020 OUTPUT VOLTAGE (V) OUTPUT VOLTAGE (V) 1.50 1.5025 MAX8556 toc02 OUTPUT VOLTAGE vs. INPUT VOLTAGE MAX8556 toc01 1.55 85 MAX8556 toc06 2.5V VIN 1.8V 60 50 40 30 VOUT (AC-COUPLED) 20 10 0 10mV/div VIN = 1.5V 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 100s/div LOAD CURRENT (A) www.maximintegrated.com Maxim Integrated 4 MAX8556/MAX8557 4A Ultra-Low-Input-Voltage LDO Regulators Typical Operating Characteristics (continued) (VEN = VIN = +1.8V, VOUT = +1.5V, IOUT = 4A, COUT = 20F, CIN = 20F, and TA = +25C, unless otherwise noted.) 4A LOAD-TRANSIENT RESPONSE 2A LOAD-TRANSIENT RESPONSE MAX8556 toc07 VOUT (AC-COUPLED) MAX8556 toc08 50mV/div IOUT 2A/div VOUT (AC-COUPLED) IOUT 40s/div 1A/div 40s/div ENABLE WAVEFORMS SHORT-CIRCUIT WAVEFORMS MAX8556 toc09 MAX8556 toc10 2V/div VEN VIN 3.6V 2V/div VOUT 1V/div IOUT 5A/div 1V/div VOUT 100s/div 200s/div PSRR vs. FREQUENCY STARTUP WAVEFORMS MAX8556 toc12 MAX8556 toc11 90 80 70 60 PSRR (dB) 50mV/div 2V/div VIN 50 40 2A/div IIN 30 1V/div 20 10 0 VOUT VIN = 2.5V ILOAD = 1A 1 10 100 1000 100s/div FREQUENCY (kHz) www.maximintegrated.com Maxim Integrated 5 MAX8556/MAX8557 4A Ultra-Low-Input-Voltage LDO Regulators Typical Operating Characteristics (continued) (VEN = VIN = +1.8V, VOUT = +1.5V, IOUT = 4A, COUT = 20F, CIN = 20F, and TA = +25C, unless otherwise noted.) 0.510 MAX8556 toc13 90 80 60 50 40 30 0.500 0.495 20 DATA TAKEN USING MAX8556 EVALUATION KIT 0 17 34 51 68 ILOAD = 50mA 0.490 85 AMBIENT TEMPERATURE (C) 10 35 60 85 CURRENT-LIMIT THRESHOLD vs. TEMPERATURE MAX8556 toc15 5A/div CURRENT-LIMIT THRESHOLD (A) 8.0 500mV/div IOUT -15 TEMPERATURE (C) FOLDBACK CURRENT-LIMIT WAVEFORMS VOUT -40 MAX8556 toc16 10 0 FB REGULATION vs. TEMPERATURE 0.505 70 FB (V) EXPOSED PADDLE TEMPERATURE (C) 100 MAX8556 toc14 EXPOSED PADDLE TEMPERATURE vs. AMBIENT TEMPERATURE 7.8 7.6 7.4 7.2 7.0 6.8 6.6 6.4 6.2 100s/div 6.0 -40 -15 10 35 60 85 TEMPERATURE (C) www.maximintegrated.com Maxim Integrated 6 MAX8556/MAX8557 4A Ultra-Low-Input-Voltage LDO Regulators 14 N.C. 15 EN 16 + OUT OUT OUT 9 MAX8556 (MAX8557) EP 1 2 3 4 IN GND 10 IN 13 11 IN FB 12 IN TOP VIEW POK (POR) Pin Configuration 8 OUT 7 OUT 6 IN 5 IN 16 TQFN 5mm x 5mm Pin Description PIN NAME FUNCTION 1-6 IN LDO Input. Connect to a 1.425V to 3.6V input voltage. Bypass with a 22F ceramic capacitor to GND. 7-11 OUT LDO Output. Bypass with 2 x 10F ceramic capacitors to GND. A smaller capacitance can be used if the maximum load current is less than 4A. POK (MAX8556) Power-OK Output. Open-drain output that pulls low when VOUT is outside 10% of the expected regulation voltage or when EN is low. POK is high impedance when VOUT is within 10% of the nominal output voltage. Connect a resistor from POK to a logic supply of less than 3.6V. POR (MAX8557) Power-On Reset. Open-drain output goes high impedance 140ms after the output is above 90% of its nominal regulation voltage. POR pulls low immediately after an output fault or when EN is low. Connect a resistor from POR to a logic supply of less than 3.6V. 13 FB Feedback Input. VFB is regulated to 0.5V. Connect to the center tap of a resistor-divider from output to GND to set the desired output voltage. 14 GND Ground 15 N.C. Connect to GND or Leave Unconnected 16 EN Enable Input. Connect to GND or a logic low to shut down the device. Connect to IN or a logic high for normal operation. -- EP Exposed Paddle. Connect to GND and to a ground plane for heatsinking. 12 www.maximintegrated.com Maxim Integrated 7 MAX8556/MAX8557 4A Ultra-Low-Input-Voltage LDO Regulators Block Diagram IN THRESHOLD THERMALOVERLOAD PROTECTION 0.50V REF EN SHUTDOWN LOGIC UNDERVOLTAGE LOCKOUT ERROR AMP P 0.45V 0.55V CURRENTLIMIT COMPARATOR OUT FB POK (POR) MAX8556 (MAX8557) POK (POR) CIRCUITRY N GND www.maximintegrated.com Maxim Integrated 8 MAX8556/MAX8557 Detailed Description The MAX8556/MAX8557 low-dropout linear regulators are capable of delivering up to 4A from low-input voltage supplies ranging from 1.425V to 3.6V with only 200mV of dropout (max). The pMOS output stage can be driven from input voltages down to 1.425V without sacrificing stability or transient performance. Supply current is not a significant function of load or input headroom because this regulator has a pMOS output device. The MAX8556/MAX8557 are fully protected from an output short circuit by current-limiting and thermal-overload circuitry. The low-power shutdown mode reduces supply current to 0.2A (typ) to maximize battery life in portable applications. The MAX8556 includes an open-drain power-OK signal (POK) that goes high when the regulator output is within 10% of its nominal output voltage. The MAX8557 includes an open-drain power-on-reset output (POR) that goes high 140ms after the output has risen above 90% of its nominal value. Internal p-Channel Pass Transistor The MAX8556/MAX8557 feature a 25m p-channel MOSFET pass transistor. Unlike similar designs using pnp pass transistors, p-channel MOSFETs require no base drive, which reduces quiescent current; pnp-based regulators also waste considerable current in dropout when the pass transistor saturates, and use high base-drive currents under large loads. The MAX8556/MAX8557 do not suffer from these problems and consume only 800A (typ) of quiescent current under heavy loads, as well as in dropout. Short-Circuit/Thermal Fault Protection The MAX8556/MAX8557 are fully protected from output short circuits through current-limiting and thermal-overload circuitry. When the output is shorted to ground, the output current is foldback limited to 3A (max). Under these conditions, the device quickly heats up. When the junction temperature reaches +160C, the thermal-overload circuitry turns off the output, allowing the device to cool. When the junction cools to +115C, the output turns back on and attempts to establish regulation. Current limiting and thermal protection continue until the fault is removed. www.maximintegrated.com 4A Ultra-Low-Input-Voltage LDO Regulators Shutdown Mode The MAX8556/MAX8557 feature a low-power shutdown mode that reduces quiescent current to 0.2A (typ). Drive EN low to disable the voltage reference, error amplifier, gate-drive circuitry, and pass transistor, and pull the output low with 5k impedance. Drive EN high or connect to IN for normal operation. Power-OK Output (POK, MAX8556 Only) The MAX8556 features a power-OK (POK) output to indicate the status of the output. POK is high impedance when the regulator output is within 10% of its nominal output voltage. If the output voltage falls/rises outside this range or the IC experiences thermal fault, POK is internally pulled low. This open-drain output requires an external pullup resistor to VIN or another logic supply below 3.6V. For glitch immunity, an internal delay circuit prevents the output from switching for 50s (typ) after the trip threshold is initially reached. POK is low when the IC is in shutdown mode. Power-On Reset (POR, MAX8557 Only) The MAX8557 features a power-on reset output that goes high impedance 140ms (typ) after the output reaches 90% of its nominal value. This open-drain output requires an external pullup resistor to VIN or another logic supply less than 3.6V. When the output falls below 90% of the nominal output voltage or the IC experiences a thermal fault, POR immediately transitions low. POR is low when the IC is in shutdown mode. Operating Region and Power Dissipation The maximum power dissipation depends on the thermal resistance of the IC package and the circuit board, the temperature difference between the die junction and ambient air, and the rate of ambient airflow. The power dissipated by the IC is P = IOUT x (VIN - VOUT). Proper PCB layout can increase the allowed power dissipation by dissipating heat in the board instead of the package. See the Thermal Considerations in PCB Layout section for more details. Maxim Integrated 9 MAX8556/MAX8557 4A Ultra-Low-Input-Voltage LDO Regulators Applications Information Output Voltage Selection The MAX8556/MAX8557 feature an adjustable output voltage from 0.5V to 3.4V. Set the output voltage using an external resistor-divider from the output to GND with FB connected to the center tap as shown in Figures 1 and 2. Choose R3 1k for light-load stability. Determine R2 using the following equation: V R2 R3 x OUT - 1 = VFB VIN 1.425V TO 3.6V C1 2 x 10F 1-6 U1 MAX8556 R1 100k 12 POK ENABLED 18 SHUTDOWN OUT IN POK GND Capacitors are required at the MAX8556/MAX8557 inputs and outputs for stable operation over the full temperature range and with load currents up to 4A. Connect 2 x 10F capacitors between IN and GND and 2 x 10F low equivalent-series-resistance (ESR) capacitors between OUT and GND. The input capacitor (CIN) lowers the source impedance of the input supply. If the MAX8556/MAX8557s' input is close to the output of the source supply, a smaller input capacitance can be used. Otherwise, 2 x 10F ceramic input capacitors are recommended. The output capacitor's (COUT) ESR affects output noise and can affect output stability. Use output capacitors with an ESR of 0.05 or less to ensure stability and optimum transient dropout. For good output transient performance, use the following formula to select a minimum output capacitance: COUT = IOUT(MAX) x 1F/200mA Noise, PSRR, and Transient Response The MAX8556/MAX8557 are designed to operate with low-dropout voltages and low quiescent currents while still maintaining low noise, good transient response, and high AC rejection (see the Typical Operating Characteristics for a plot of Power-Supply Rejection Ratio (PSRR) vs. Frequency). When operating from noisy sources, improved supply-noise rejection and transient response can be achieved by increasing the values of the input and output www.maximintegrated.com C2 2 x 10F 13 R3 1k 14 N.C. 15 where VOUT is the desired output voltage and VFB is 0.5V. Capacitor Selection and Regulator Stability R2 1.4k FB EN VOUT 1.2V AT 4A 7-11 Figure 1. MAX8556 Typical Application Circuit VIN 1.7V TO 3.6V C1 2 x 10F POR SHUTDOWN 1-6 OUT IN U2 MAX8557 R1 100k 12 ENABLED 18 POR R2 2k FB EN VOUT 1.5V AT 4A 7-11 GND C2 2 x 10F 13 R3 1k 14 N.C. 15 Figure 2. MAX8557 Typical Application Circuit bypass capacitors and through passive filtering techniques. The MAX8556/MAX8557 load-transient response graphs (see the Typical Operating Characteristics) show two components of the output response: a DC shift from the output impedance due to the load current change, and the transient response. A typical transient overshoot for a step change in the load current from 40mA to 4A is 40mV. Use an output capacitance from 20F to 120F to attenuate the overshoot. Maxim Integrated 10 MAX8556/MAX8557 4A Ultra-Low-Input-Voltage LDO Regulators Thermal Considerations in PCB Layout where: How much power the package can dissipate strongly depends on the mounting method of the IC to the PCB and the copper area for cooling. Using the JEDEC test standard, the maximum power dissipation allowed in the package is 2667mW. This data is obtained with +70C ambient temperature and +150C maximum junction temperature. The test board has dimensions of 7.62cm x 7.62cm (3in x 3in) with four layers of 2oz copper and FR-4 material with 62mil finished thickness. Nine thermal vias are used under the thermal paddle with a diameter of 12mil and 1mil plated copper thickness. Top and bottom layers are used to route the traces. Two middle layers are solid copper and isolated from the nine thermal vias. More power dissipation can be handled by the package if great attention is given during PCB layout. For example, using the top and bottom copper as a heatsink and connecting the thermal vias to one of the middle layers (GND) transfers the heat from the package into the board more efficiently, resulting in lower junction temperature at high power dissipation in some MAX8556/MAX8557 applications. Furthermore, the solder mask around the IC area on both top and bottom layers can be removed to radiate the heat directly into the air. The maximum allowable power dissipation in the IC is as follows: PMAX = JC = the thermal resistance from the junction to the case (1.7C/W for the 16-pin TQFN) CA = the thermal resistance from the case to the surrounding air through the PCB, copper traces, and the package materials. CA is directly related to system level variables and can be modified to increase the maximum power dissipation. The TQFN package has an exposed thermal pad on its underside. This pad provides a low thermal resistance path for heat transfer into the PCB. This low thermally resistive path carries a majority of the heat away from the IC. The PCB is effectively a heatsink for the IC. The exposed paddle should be connected to a large ground plane for proper thermal and electrical performance. The minimum size of the ground plane is dependent upon many system variables. To create an efficient path, the exposed paddle should be soldered to a thermal landing, which is connected to the ground plane by thermal vias. The thermal landing should be at least as large as the exposed paddle and can be made larger depending on the amount of free space from the exposed paddle to the other pin landings. A sample layout is available on the MAX8556 evaluation kit to speed designs. (TJ(MAX) - T A ) JC + CA Ordering Information Chip Information TEMP RANGE PINPACKAGE FEATURE MAX8556ETE+ -40C to +105C 16 TQFN-EP* POK MAX8556ETE/V+ -40C to +85C 16 TQFN-EP* POK MAX8557ETE+ -40C to +85C 16 TQFN-EP* POR PART TJ(MAX) = the maximum junction temperature (+150C) TA = the ambient air temperature TRANSISTOR COUNT: 3137 PROCESS: BiCMOS +Denotes a lead(Pb)-free/RoHS-compliant package. /V Denotes an automotive qualified part. *EP = Exposed pad. www.maximintegrated.com Maxim Integrated 11 MAX8556/MAX8557 4A Ultra-Low-Input-Voltage LDO Regulators Revision History REVISION NUMBER REVISION DATE PAGES CHANGED 0 4/04 Initial release -- 1 8/08 Revised Pin Configuration 1 2 8/09 Added automotive version of the MAX8556 1 3 4/17 Updated MAX8556ETE+ operating temperature range in Electrical Characteristics and Ordering Information tables. Updated Package Information table. DESCRIPTION 1-3, 11 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated's website at www.maximintegrated.com. Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. (c) 2017 Maxim Integrated Products, Inc. 12 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Maxim Integrated: MAX8556ETE+ MAX8557ETE+ MAX8556ETE+T MAX8557ETE+T MAX8556ETE/V+ MAX8556ETE/V+T