ST1PS01 Datasheet 400 mA nano-quiescent synchronous step-down converter with digital voltage selection and Power Good Features * 500 nA input quiescent current at VIN=3.6 V (not switching) * 94% typical efficiency at 1 mA load (VIN=3.6 V, VOUT=3.3 V) * * * 100% duty cycle 1.8 V to 5.5 V input operating range Undervoltage lockout: 1.57 V (VIN falling, typ.) * * * * * * * Up to 400 mA output current capability Low power control operation for the best efficiency Embedded soft-start circuit Tiny external components: L=2.2 H typ. Selectable output voltages: 1.8 V to 3.3 V Output voltage Power Good 1.5% output voltage accuracy (VOUT, TA=25 C) * * Dynamic output voltage selection (D0, D1) Available in Flip-Chip package Applications Product status link ST1PS01 Product summary ST1PS01AJR Order code ST1PS01DJR * * * * * * * Wearable applications Personal tracking monitors Smart watches, sport bands Energy harvesting, wireless sensors Wearable and fitness accessories Industrial sensors, portable low power devices Single cell Li-Ion battery applications * * Bluetooth(R) low energy Zigbee ST1PS01EJR 1.9 V, 2.0 V, 2.1 V, 2.8 V (A vers.) Output voltages 1.8 V, 2.3 V, 2.5 V, 2.8 V (D vers.) 1.8 V, 2.7 V, 3.0 V, 3.3 V (E vers.) Flip-Chip Package (1.11x1.41mm) 400 m pitch Description The ST1PS01 is a nano-quiescent miniaturized synchronous step-down converter, which is able to provide up to 400 mA output current with an input voltage ranging from 1.8 V to 5.5 V. This converter is specifically designed for applications where high efficiency, PCB size and thickness are the key factors. The output voltage can be set using two digital control inputs, a VOUT from 1.8 V to 3.3 V can be dynamically selected. Thanks to the enhanced PCC (peak current control) the ST1PS01 reaches very high efficiency conversion using just a 2.2 H inductor and two small capacitors. Advanced design circuitry is implemented to minimize the quiescent current. The device is available in Flip-Chip package. DS12799 - Rev 2 - December 2018 For further information contact your local STMicroelectronics sales office. www.st.com ST1PS01 Application schematic 1 Application schematic Figure 1. ST1PS01 application schematic EN VIN CIN PGOOD VIN H/L D0 H/L D1 L SW VOUT RPU VOUT COUT Vcc GND GPIO Low voltage system ST1PS01 GND Table 1. Typical external components DS12799 - Rev 2 Component Description Value Size - imperial (metric) CIN Ceramic capacitor with low ESR values 10 F 0603 (1608) COUT Ceramic capacitor with low ESR values 10 F 0603 (1608) L Inductor 2.2 H 0806 (2016) RPU Pull-up resistor 1 M 0402 (1005) page 2/20 ST1PS01 Pin configuration (top through view) 2 Pin configuration (top through view) Figure 2. Flip-Chip8 package 1 A D1 B C 3 VIN EN D0 D E 2 SW GND PGOOD VOUT Table 2. Pin description DS12799 - Rev 2 Name Bump name Description VIN A3 Input supply voltage. Bypass this pin to ground with a 10 F capacitor SW C3 Switching node. Inductor connection VOUT E3 Sense pin used to monitor output voltage EN B2 Enable pin. High logic level turns on the IC. VIN referred GND D2 Ground D1 A1 D0 C1 Output voltage selection inputs (Refer to the Table 7. Output voltage settings for order codes and configuration matrix) PGOOD E1 Open drain output. It is in high impedance when the output voltage reaches 97.5% of the target VOUT page 3/20 ST1PS01 Functional pin description 3 Functional pin description GND Device ground pin. VIN Supply voltage. This pin supplies power to the internal analog and digital circuitries when voltage is higher than VUVLO. Bypass this pin to GND with a 10 F ceramic capacitor. Input capacitor CIN must be chosen with low ESR to reduce the input voltage ripple. SW Inductor connection to internal PMOS and NMOS switches. VOUT Output voltage sense input. It provides the feedback voltage level to the regulation circuitry. 10 F output capacitor COUT must be connected close to the pin or through a short trace and should have low ESR to reduce the output voltage ripple. EN Enable pin. A logic low level on this pin disables the device. High level enables the device. Do not leave this pin floating. D1, D2 Output voltage selection pins. See the Table 7. Output voltage settings for VOUT selection. Do not leave these pins floating. These pins can be dynamically changed during operation. PGOOD Power Good open drain output. If used it requires a pull-up resistor to hold a high level signal. High impedance indicates that VOUT is above proper good threshold. DS12799 - Rev 2 page 4/20 ST1PS01 Maximum ratings 4 Maximum ratings Table 3. Absolute maximum ratings Symbol Value Unit Power and signal supply voltage - 0.3 to + 6.5 V EN, D0, D1 Logic input pins - 0.3 to + 6.5 V VOUT, SW Output signal monitoring and switching pins -0.3 to VIN + 0.3 V - 0.3 to + 6.5 V Operating ambient temperature -40 to 85 C TJ Junction temperature -40 to 125 C TSTG Storage temperature -55 to 150 C VIN PGOOD TAMB Note: Parameter Power Good open drain output pin Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied Table 4. Thermal data Symbol RthJA Parameter Thermal resistance junction-ambient Flip-Chip8 Unit 60 C/W Table 5. Recommended operating conditions DS12799 - Rev 2 Symbol Parameter Min. VIN Input supply voltage 1.8 Typ. Max. Unit 5.5 V page 5/20 ST1PS01 Electrical characteristics 5 Electrical characteristics CIN= 10 F, COUT= 10 F, L=2.2 H, VIN=3.6 V, VEN= VIN, VOUT=1.8 V, TA=25 C unless otherwise specified. Table 6. Electrical characteristics Symbol Parameter Test conditions Min. Typ. Max. Unit General section IQ Quiescent current EN=VIN, IOUT=0 A, VOUT=1.8 V, device does not switch, VIN=2.5 V to 5.5 V 500 1000 nA ISD Shutdown current EN=GND, shutdown current into VIN 10 200 nA VIN rising 1.63 1.72 V VIN falling 1.51 1.57 VUVLO Undervoltage lockout threshold Hysteresis 65 Vth100%+ 100% mode leave threshold VIN rising, 100% mode is disabled with VIN = VOUTnom + Vth100%+ 300 Vth100%- 100% mode enter threshold VIN falling, 100% mode is entered with VIN = VOUTnom + Vth100%- 200 V mV mV Output voltage VOUT Output voltage range Output voltages are selected with pins D0, D1 1.8 3.3 V Output voltage accuracy VIN = 3.6 V, whole VOUT range, IOUT=100 mA -1.5 1.5 % tONmin Minimum on-time VIN = 3.6 V, VOUT= 2 V, IOUT= 0 mA 200 ns tOFFmin Minimum off-time VIN=2.3V 50 ns tstartupd Start-up delay time ROUTDIS Output discharge MOSFET onresistance VEN from low to high, VIN = 3.6 V, VOUT = 1.8 V 0.5 VEN= GND 4 30 ms Logic inputs (EN, D0, D1) VIL Low level input voltage threshold VIH High level input voltage threshold VIN=1.8 V to 5.5 V 0.3 1 V Power switch RDS(on) ILIM1 ILIMSS High-side MOSFET on-resistance Low-side MOSFET on-resistance High-side MOSFET switch current limit Low-side MOSFET switch current limit High-side MOSFET switch current limit during soft-start VIN = 3.6 V, Isw = 400 mA 580 0.38 0.45 0.14 0.2 700 820 1.8 V VIN 5.5 V 500 Reduced switch current limit during soft-start period (typ. 400 s) 200 280 Rising output voltage on VOUT pin, referred to VOUT selected (D0, D1) 95 97.5 Hysteresis. To see plot for temperature variation -6 -4.25 mA 360 Power Good output (PGOOD) Vthpg- Power Good threshold voltage VthpgH VOL DS12799 - Rev 2 Low level output voltage 1.8 V VIN 5.5 V, EN = GND, current into PGOOD pin, IPGOOD = 4 mA % -2.5 0.23 V page 6/20 ST1PS01 Electrical characteristics Table 7. Output voltage settings Device ST1PS01AJR ST1PS01DJR ST1PS01EJR DS12799 - Rev 2 D1 D0 VOUT 0 0 1.9 V 0 1 2.0 V 1 0 2.1 V 1 1 2.8 V 0 0 1.8 V 0 1 2.3 V 1 0 2.5 V 1 1 2.8 V 0 0 1.8 V 0 1 2.7 V 1 0 3.0 V 1 1 3.3 V page 7/20 ST1PS01 ST1PS01 block diagram 6 ST1PS01 block diagram Figure 3. Block diagram PGOOD VIN VIN Cin Bandgap/Bias Vref VIN Vuvlo - UVLO comp. + VFB - Vref + Rpu Output discharge EN VOUT VIN VOUT Peak and valley CURRENT LIMIT VSW Min. ON time D1 Vout selection logic D0 Min. OFF time Pulse freq. detection VFB VOUT VSW + - Vref + + Driver/ anti -cross conduction circuitry L SW Cout High current mode VSW + VIN - Vth100% + TON Compensation Soft-start ramp DS12799 - Rev 2 PWM CTRL d Logic 100% Zerocrossing mode comp. comp. - GND page 8/20 ST1PS01 Operation description 7 Operation description The ST1PS01 is an ultra-low quiescent new generation buck converter. It targets a very small quiescent current consumption (typical 500 nA) and it guarantees high efficiency operation even down to few microampere loads. It is based on a hysteretic comparator that senses the coil ripple current that is always held constant in all operation modes. The device has seamless transition between PFM (pulse frequency modulation) and PWM (pulse width modulation) mode with low ripple and good load transient response. In order to maintain constant ripple current on the selected coil, the device changes switching frequency, which also depends on input supply voltage. During PWM mode (heavy load), the device operates in continuous conduction up to 400 mA and switching frequency can reach 2 MHz maximum. 7.1 Power save mode At light load the device enters automatically power save mode with total current consumption from the input power supply of 500 nA typical; during this condition most of the internal blocks are turned off in order to reach ultra-low power consumption. During this time, the load current is supported by the output capacitor. 7.2 Output voltage The device allows output voltage selection without external resistor divider. A couple of standard digital inputs are used to configure the device to supply a fixed output voltage according to Table 7. Output voltage settings. The VOUT pin must be connected directly and as close as possible to the inductor terminal to obtain the best performance and get the best output voltage regulation. The output voltage can be dynamically changed to implement voltage scaling. 7.3 Output discharge and UVLO The device embeds a fast output discharge circuitry active when the enable pin is held to ground (EN=gnd) or when the input supply voltage reaches the minimum voltage level set by the UVLO protection circuit (undervoltage lock-out protection circuit). The UVLO rising threshold at 1.63 V (typ.) guarantees a proper device supply voltage operation. 7.4 Soft-start and current limitation The device embeds a fixed soft-start circuit active during a limited time period (few ms). This feature allows the inrush current to be minimized from the power supply in case of weak source. During this period internal circuit reduces to 280 mA the typical switch current limit. 7.5 100% duty cycle operation The device enters 100% duty cycle operation if the input voltage comes close to the selected output voltage. During this mode, the regulator is turned off and output pin is directly connected to the input pin through the highside MOSFET. The output voltage follows the input level minus the voltage drop across the internal MOSFET and the inductor. Once the input voltage exceeds the 100% duty cyle leave threshold, the device restarts to switch and regulates the select output voltage again. 7.6 Power Good flag The Power Good comparator monitors the selected VOUT voltage. The Power Good open drain output is in high impedance when the VOUT reaches the correct voltage level while it switches to low level when VOUT falls below the normal voltage level. DS12799 - Rev 2 page 9/20 ST1PS01 Typical performance characteristics 8 Typical performance characteristics Figure 4. Efficiency vs load, VOUT= 1.8 V Figure 5. Efficiency vs VIN, VOUT= 1.8 V 100% 95% 90% 90% 80% 70% 85% VIN 2.8V VIN 3.2V VIN 3.6V Efficiency [%] Efficiency [%] 60% VIN 4.2V 50% VIN 5V 40% 80% Iout = 100A Iout = 1mA 75% Iout = 50mA Iout = 100mA 30% Iout = 200mA 70% L = 2.2H COUT = 10F 20% L = 2.2H COUT = 10F 65% 10% 0% 0.001 60% 0.01 0.1 1 10 100 1000 2 2.5 3 3.5 4 Load current [mA] 4.5 5 5.5 6 Input Voltage [V] Figure 6. Efficiency vs load, VOUT= 3.3 V Figure 7. Efficiency vs VIN, VOUT= 3.3 V 100% 100% 90% 95% 90% 80% VIN 3.6V VIN 4.2V 85% VIN 5V Efficiency [%] Efficiency [%] 70% 60% Iout = 100A Iout = 1mA 80% Iout = 50mA Iout = 100mA 75% 50% Iout = 200mA L = 2.2H COUT = 10F 70% 40% L = 2.2H COUT = 10F 65% 30% 20% 0.001 60% 0.01 0.1 1 Load current [mA] DS12799 - Rev 2 10 100 1000 3.3 3.8 4.3 4.8 5.3 5.8 Input voltage [V] page 10/20 ST1PS01 Typical performance characteristics DS12799 - Rev 2 Figure 8. 100% mode, VOUT = 1.8 V Figure 9. 100% mode, VOUT = 3.0 V Figure 10. VOUT change, 1.8 V to 3.3 V to 1.8 V, IOUT=5 mA Figure 11. Output ripple, VIN=3.6 V, VOUT =1.8 V, IOUT=10 A Figure 12. Output ripple, VIN=3.6 V, VOUT =1.8 V, IOUT=10 mA Figure 13. Output ripple, VIN=3.6 V, VOUT =1.8 V, IOUT=50 mA page 11/20 ST1PS01 Typical performance characteristics Figure 14. Output ripple, VIN=3.6 V, VOUT =1.8 V, IOUT=150 mA Figure 15. Output ripple, VIN=3.6 V, VOUT =1.8 V, IOUT=250 mA Figure 16. Start-up, VIN=3.6 V, VOUT=1.8 V, no load Figure 17. Disable, VIN=3.6 V, VOUT =1.8 V, no load Figure 18. Start-up, VIN=3.6 V, VOUT=1.8 V, IOUT=100 Figure 19. Disable, VIN=3.6 V, VOUT =1.8 V, IOUT=100 mA mA DS12799 - Rev 2 page 12/20 ST1PS01 Typical performance characteristics Figure 20. Load transient, VIN=3.6 V, VOUT=1.8 V, IOUT=50 A to 10 mA Figure 21. Load transient, VIN=3.6 V, VOUT=1.8 V, IOUT=0 to 100 mA Figure 22. Load transient, VIN=3.6 V, VOUT=1.8 V, IOUT=0 to 100 mA DS12799 - Rev 2 page 13/20 ST1PS01 Package information 9 Package information In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK(R) packages, depending on their level of environmental compliance. ECOPACK(R) specifications, grade definitions and product status are available at: www.st.com. ECOPACK(R) is an ST trademark. 9.1 Flip-Chip 8 (1.14x1.44 mm) package information Figure 23. Flip-Chip 8 (1.14x1.44 mm) package outline DS12799 - Rev 2 page 14/20 ST1PS01 Flip-Chip 8 (1.14x1.44 mm) package information Table 8. Flip-Chip 8 (1.14x1.44 mm) mechanical data Milimeters Symbol Min. Typ. Max. A 0.500 0.550 0.600 A1 0.170 0.200 0.230 A2 0.330 0.350 0.370 b 0.230 0.250 0.270 D 1.08 1.11 1.14 D1 E 0.624 1.38 1.41 E1 1.00 fE 0.205 fD 0.243 eE 0.250 eD 0.312 e 0.50 J 0.40 ccc 0.05 1.44 Figure 24. Flip-Chip 8 (1.14x1.44 mm) recommended footprint DS12799 - Rev 2 page 15/20 ST1PS01 Flip-Chip 8 (1.14x1.44 mm) packing information 9.2 Flip-Chip 8 (1.14x1.44 mm) packing information Figure 25. Flip-Chip 8 (1.14x1.44 mm) tape outline Figure 26. Flip-Chip 8 (1.14x1.44 mm) tape orientation DS12799 - Rev 2 1 A MARKING A MARKING 1 MARKING 1 A page 16/20 ST1PS01 Flip-Chip 8 (1.14x1.44 mm) packing information Figure 27. Flip-Chip 8 (1.14x1.44 mm) reel outline Table 9. Reel mechanical data DS12799 - Rev 2 A max. N min. W1 max. [mm] W2 max. [mm] W3 min./max. [mm] 180 60 8.4 14.4 7.9/10.9 page 17/20 ST1PS01 Revision history Table 10. Document revision history DS12799 - Rev 2 Date Version 31-Oct-2018 1 13-Dec-2018 2 Changes Initial release. Updated Section 8 Typical performance characteristics. Added Section 9.2 Flip-Chip 8 (1.14x1.44 mm) packing information. page 18/20 ST1PS01 Contents Contents 1 Application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2 Pin configuration (top through view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3 Functional pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 5 Electrical characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 6 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 7 Operation description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 7.1 Power save mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 7.2 Output voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 7.3 Output discharge and UVLO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 7.4 Soft-start and current limitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 7.5 100% duty cycle operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 7.6 Power Good flag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 8 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 9 Package information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14 9.1 Flip-Chip8 (1.14x1.44 mm) package information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 9.2 Flip-Chip 8 (1.14x1.44 mm) packing information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18 DS12799 - Rev 2 page 19/20 ST1PS01 IMPORTANT NOTICE - PLEASE READ CAREFULLY STMicroelectronics NV and its subsidiaries ("ST") reserve the right to make changes, corrections, enhancements, modifications, and improvements to ST products and/or to this document at any time without notice. Purchasers should obtain the latest relevant information on ST products before placing orders. ST products are sold pursuant to ST's terms and conditions of sale in place at the time of order acknowledgement. Purchasers are solely responsible for the choice, selection, and use of ST products and ST assumes no liability for application assistance or the design of Purchasers' products. No license, express or implied, to any intellectual property right is granted by ST herein. Resale of ST products with provisions different from the information set forth herein shall void any warranty granted by ST for such product. ST and the ST logo are trademarks of ST. All other product or service names are the property of their respective owners. Information in this document supersedes and replaces information previously supplied in any prior versions of this document. (c) 2018 STMicroelectronics - All rights reserved DS12799 - Rev 2 page 20/20