ST1PS01BJR

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 µH typ. Selectable output voltages: 0.625 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 • • • • • • • 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® low energy Zigbee 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 0.625 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 µH 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 6 - June 2021 For further information contact your local STMicroelectronics sales office. www.st.com ST1PS01 Application schematic 1 Application schematic Figure 1. ST1PS01 application schematic Table 1. Typical external components DS12799 - Rev 6 Component Description Value Size - imperial (metric) CIN Ceramic capacitor with low ESR values 10 µF 0603 (1608) COUT Ceramic capacitor with low ESR values 10 µF 0603 (1608) L Inductor 2.2 µH 0806 (2016) RPU Pull-up resistor 1 MΩ 0402 (1005) page 2/20 ST1PS01 Pin configuration 2 Pin configuration Figure 2. Flip-Chip8 package (top through view) 1 A D1 B C 3 VIN EN D0 D E 2 SW GND PGOOD VOUT Table 2. Pin description DS12799 - Rev 6 Name Bump name VIN A3 Input supply voltage. Bypass this pin to ground with a 10 µF capacitor SW C3 Switching output. 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 PGOOD E1 Description Output voltage selection inputs (Refer to the Section 5 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 μF 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 µF 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. D0, D1 Output voltage selection pins. See the Section 5 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 6 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 6 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 µF, COUT= 10 µF, L=2.2 µH, RPU=1 MOhm, 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 EN=VIN, IQ Quiescent current device does not switch (VOUT pin voltage > VOUT setting value), - 500 1000 nA EN = GND, shutdown current into VIN - 10 200 nA VIN rising - 1.63 1.72 V VIN falling 1.51 1.57 - V Hysteresis - 65 - mV 100% mode leave threshold VIN rising, 100% mode is disabled with VIN = VOUTnom + Vth100%+ - 300 - 100% mode enter threshold VIN falling, 100% mode is entered with VIN = VOUTnom + Vth100%- - 200 - VIN= VOUT_min.+0.3 V (1.8 V min.) to 5.5 V ISD VUVLO Vth100%+ Vth100%- Shutdown current Undervoltage lockout threshold mV Output voltage VOUT Output voltage range Output voltages are selected with pins D0, D1 0.625 - 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 A - 200 - ns tOFFmin Minimum off-time VIN=2.3V - 50 - ns tstartupd Start-up delay time VEN from low to high, VIN = 3.6 V, VOUT = 1.8 V - 1.7 - ms ROUTDIS Output discharge MOSFET onresistance VEN= GND - 30 - Ω - - 0.3 1.1 - - 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 V Power switch RDS(on) High-side MOSFET onresistance - 0.38 0.45 - 0.14 0.2 1.8 V ≤ VIN ≤ 5.5 V 500 - 1150 Reduced switch current limit during soft-start period (typ. 400 µs) 180 280 360 Rising output voltage on VOUT pin, referred to VOUT selected (D0, D1) 95 97.5 - Hysteresis -4 -3.2 -2.5 VIN = 3.6 V, Isw = 400 mA Low-side MOSFET on-resistance ILIM1 High-side MOSFET switch current limit ILIMSS High-side MOSFET switch current limit during soft-start Ω mA Power Good output (PGOOD) Vthpg VthpgH DS12799 - Rev 6 Power Good threshold voltage % page 6/20 ST1PS01 Electrical characteristics Symbol Parameter VOL Low level output voltage Test conditions Min. 1.8 V ≤ VIN ≤ 5.5 V, EN = GND, current into PGOOD pin, IPGOOD = 4 mA - Typ. Max. Unit - 0.23 V Table 7. Output voltage settings Device ST1PS01AJR ST1PS01BJR ST1PS01CJR ST1PS01DJR ST1PS01EJR ST1PS01FJR ST1PS01GJR ST1PS01HJR 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 1.1 V 0 1 1.2 V 1 0 1.5 V(1) 1 1 1.7 V(1) 0 0 1.0 V 0 1 1.2 V 1 0 1.3 V 1 1 1.5 V(1) 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 0 0 1.05 V 0 1 1.25 V 1 0 1.35 V 1 1 1.55 V(1) 0 0 0.73 V 0 1 0.80 V 1 0 0.90 V 1 1 1.0 V 0 0 1.05 V 0 1 0.90 V 1 0 0.70 V 1 1 0.625 V 1. Vout can be dinamically selected when VIN=Vout selected+300 mV, at least. DS12799 - Rev 6 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 Compensation + - Vref + + Driver/ anti -cross conduction circuitry L SW Cout High current mode VSW + VIN - Vth100% + TON Soft-start ramp DS12799 - Rev 6 PWM CTRL d Logic Zero100% crossing 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 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 Section 5 . 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. The ST1PS01 embeds also a current limit on high-side MOSFET to protect the device against overload or short-circuit on the output, during normal operation conditions. When the device enters 100% duty cycle operation condition and an overload (or short-circuit) occurs, the output voltage is set in shutdown in order to limit the power dissipation. To restart the device operation, a LOW to HIGH cycle on EN pin is necessary. 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 high-side 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 6 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 = 100µA Iout = 1mA 75% Iout = 50mA Iout = 100mA 30% Iout = 200mA 70% L = 2.2µH COUT = 10µF 20% L = 2.2µH COUT = 10µF 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 = 100µA Iout = 1mA 80% Iout = 50mA Iout = 100mA 75% 50% Iout = 200mA L = 2.2µH COUT = 10µF 70% 40% L = 2.2µH COUT = 10µF 65% 30% 20% 0.001 60% 0.01 0.1 1 Load current [mA] DS12799 - Rev 6 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 6 Figure 8. 100% mode, VOUT 1.8 V, IOUT 100 mA Figure 9. 100% mode, VOUT 3 V, IOUT 10 mA Figure 10. VOUT change, 1.8 V to 3 V to 1.8 V, IOUT 5 mA, VIN 3.6 V Figure 11. Output ripple, VIN 3.6 V, VOUT 1.8 V, IOUT 10 uA Figure 12. Output ripple, VIN 3.6 V, VOUT 1.8 V, IOUT 1 mA Figure 13. Output ripple, VIN 3.6 V, VOUT 1.8 V, IOUT 50 mA page 11/20 ST1PS01 Typical performance characteristics DS12799 - Rev 6 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 mA Figure 19. Disable, VIN 3.6 V, VOUT 1.8 V, IOUT 100 mA page 12/20 ST1PS01 Typical performance characteristics Figure 20. Load transient, VIN 3.6 V VOUT 1.8 V, IOUT Figure 21. Load transient, VIN 3.6 V, VOUT 1.8 V, IOUT 50 uA to 10 mA 0 to 100 mA Figure 22. Load transient, VIN 3.6 V, VOUT 1.8 V, IOUT 10 mA to 100 mA DS12799 - Rev 6 page 13/20 ST1PS01 Package information 9 Package information In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK packages, depending on their level of environmental compliance. ECOPACK specifications, grade definitions and product status are available at: www.st.com. ECOPACK 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 6 page 14/20 ST1PS01 Flip-Chip 8 (1.14x1.44 mm) package information Table 8. Flip-Chip 8 (1.14x1.44 mm) mechanical data Symbol Milimeters 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 6 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 6 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 6 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 Date Version 31-Oct-2018 1 13-Dec-2018 2 13-Dec-2019 3 22-Jul-2020 4 Changes Initial release. Updated Section 8 Typical performance characteristics. Added Section 9.2 Flip-Chip 8 (1.14x1.44 mm) packing information. Updated Figure 22. Load transient, VIN 3.6 V, VOUT 1.8 V, IOUT 10 mA to 100 mA. Updated the cover page, Section 5 Electrical characteristics, Section 8 Typical performance characteristics. Minor text changes. 22-Sep-2020 5 Updated Section Features. Updated Figure 1. ST1PS01 application schematic. 28-Jun-2021 6 Updated Section 3 Functional pin description, Section 7.4 Soft-start and current limitation and Table 6. Electrical characteristics. Updated Table 7. Output voltage settings. DS12799 - Rev 6 page 18/20 ST1PS01 Contents Contents 1 Application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18 DS12799 - Rev 6 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. For additional information about ST trademarks, please refer to www.st.com/trademarks. 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. © 2021 STMicroelectronics – All rights reserved DS12799 - Rev 6 page 20/20