ST1PS02 Datasheet 400 mA nano-quiescent synchronous step-down converter with digital voltage selection, Power Good and AUX switch 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. Settable inductor current limitation Selectable output voltages: 1.0 V to 3.3 V Output voltage Power Good 1.5% output voltage accuracy (VOUT, TA = 25 C) * * * Dynamic output voltage selection (D0, D1 and D2) Auxiliary load switch Vout2 (AUX control input) Available in TQFN12 package Applications Product status link ST1PS02 * * * * * * * 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 Description The ST1PS02 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 ST1PS02 reaches very high efficiency conversion using just a 2.2 H inductor and two small capacitors. The device embeds a controlled load switch to supply a subsystem with same voltage rail. Advanced design circuitry is implemented to minimize the quiescent current. The device is available in thin plastic package. DS13206 - Rev 1 - February 2020 For further information contact your local STMicroelectronics sales office. www.st.com ST1PS02 Application schematic 1 Application schematic Figure 1. ST1PS02 application schematic Table 1. Typical external components DS13206 - Rev 1 Component Description C1 Ceramic capacitor with low ESR values C2, C3 Ceramic capacitor with low ESR values L1 Inductor R1 Pull-up resistor R2 Current limit resistor Value Size - imperial (metric) 10 F 0603 (1608) 2.2 H 0806 (2016) 1 M 0402 (1005) page 2/23 ST1PS02 Pin configuration 2 Pin configuration Figure 2. TQFN12 package (top through view) Table 2. Pin description DS13206 - Rev 1 Name Bump name Description AUX 1 Enable for the auxiliary output voltage VIN 2 Input supply voltage. Bypass this pin to ground with a 10 F capacitor SW 3 Switching output. Inductor connection GND 4 Ground VOUT 5 Sense pin used to monitor output voltage Vout2 6 Auxiliary output pin with OCP (100 mA max. load) PGOOD 7 Open drain output. It is in high impedance when the output regulation reaches 97% CL 8 Current limit set. Connect to GND sets the default value (700 mA). An external resistor connected to GND can be used to adjust this parameter with a lower value (resistor values are reported on Table 6. Electrical characteristics D0 9 D1 10 D2 11 EN 12 Output voltage selection inputs ( refer to the order code table) Enable pin. High logic level on the IC. VIN threshold referred page 3/23 ST1PS02 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 C1 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 C2 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, D2 Output voltage selection pins. See the Table 2 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. AUX Load switch selection pins. Vout2 output is activated when this pin is at high level. Held to ground if auxiliary output (Vout2) is not used or if it should be disabled. Vout2 Auxiliary output. It provides the same regulated voltage level as main output (VOUT) less drop on the load switch circuitry. 10 F output capacitor COUT2 must be connected close to the pin or through a short trace and should have low ESR to reduce the output voltage ripple. This output is controlled from a soft-start circuit, if unused can be left open. CL Current limit threshold input. Held to ground if not used and default current limitation is the proper value. For smaller current values a pull-down resistor must be used. DS13206 - Rev 1 page 4/23 ST1PS02 Maximum ratings 4 Maximum ratings Table 3. Absolute maximum ratings Symbol Parameter VIN EN, D0, D1, D2, AUX CL VOUT, SW Vout2 Unit Power and signal supply voltage - 0.3 to + 6.5 V Logic input pins - 0.3 to + 6.5 V Current limitation input pin - 0.3 to + 6.5 V -0.3 to VIN + 0.3 V Output signal monitoring and switching pins Load switch output pin - 0.3 to + 6.5 Power Good open drain output pin - 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 PGOOD TAMB Note: Value 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 TQFN12 Unit 75 C/W Table 5. Recommended operating conditions Symbol VIN DS13206 - Rev 1 Parameter Input supply voltage Min. 1.8 Typ. Max. Unit 5.5 V page 5/23 ST1PS02 Electrical characteristics 5 Electrical characteristics C1= 10 F, C2= 10 F, C3= 10 F, L1=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 EN=VIN, AUX=GND, IOUT=0 A, VOUT=1.8 V, device does not switch, IQ Quiescent current 500 1000 VIN=2.5 V to 5.5 V EN=VIN, AUX=VIN, IOUT=ouA, VOUT=1.8 V, device not switching ISD Shutdown current EN=GND, shutdown current into VIN VIN rising VUVLO Undervoltage lockout threshold nA VIN falling 2 4 A 10 200 nA 1.63 1.72 V 1.51 1.57 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 Output voltage range Output voltages are selected with pins D0, D1, D2 1.0 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 225 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 ROUTDIS Output discharge MOSFET onresistance VEN= GND VOUT 1 5 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) High-side MOSFET onresistance 0.38 0.45 VIN = 3.6 V, Isw = 400 mA Low-side MOSFET on-resistance DS13206 - Rev 1 0.14 0.2 ILIM1 High-side MOSFET switch current limit 1.8 V VIN 5.5 V, CL=GND 750 1000 ILIM2 High-side MOSFET switch current limit 1.8 V VIN 5.5 V, CL=1 M 500 800 ILIM3 High-side MOSFET switch current limit 1.8 V VIN 5.5 V, CL=2.2 M mA 250 mA page 6/23 ST1PS02 Electrical characteristics Symbol ILIMSS Parameter High-side MOSFET switch current limit during soft-start Test conditions Min. Typ. Max. Unit 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, D2) 95 97.5 Hysteresis -4 -3.5 360 mA Power Good output (PGOOD) Vthpg- Power Good threshold voltage VthpgH VOL 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 Auxiliary output (Vout2) RAUX High-side MOSFET onresistance Rdisc2 Low-side MOSFET on-resistance ILoad=100 mA, Aux=GND (discharger) tr_aux Vaux rise time ILoad=100 mA, Aux=VIN Starting with AUX low-to-high transition, time to ramp VLOAD from 0 V to 95% VOUT = 1.8 V, 0.6 0.8 30 50 315 600 s 2.2 V VIN 5.5 V, ILOAD = 1 mA DS13206 - Rev 1 page 7/23 ST1PS02 Electrical characteristics Table 7. Output voltage settings Device ST1PS02AJR ST1PS02BJR ST1PS02CJR ST1PS02DJR DS13206 - Rev 1 D0 VOUT D2 D1 0 0 0 1.40 V 0 0 1 1.45 V 0 1 0 1.50 V 0 1 1 1.55 V 1 0 0 1.60 V 1 0 1 1.65 V 1 1 0 1.70 V 1 1 1 1.75 V 0 0 0 1.8 V 0 0 1 1.9 V 0 1 0 2.0 V 0 1 1 2.1 V 1 0 0 2.2 V 1 0 1 2.3 V 1 1 0 2.4 V 1 1 1 2.5 V 0 0 0 2.6 V 0 0 1 2.7 V 0 1 0 2.8 V 0 1 1 2.9 V 1 0 0 3.0 V 1 0 1 3.1 V 1 1 0 3.2 V 1 1 1 3.3 V 0 0 0 1.10 V 0 0 1 1.15 V 0 1 0 1.20 V 0 1 1 1.25 V 1 0 0 1.30 V 1 0 1 1.35 V 1 1 0 1.00 V 1 1 1 1.05 V page 8/23 ST1PS02 ST1PS02 block diagram 6 ST1PS02 block diagram Figure 3. Block diagram VIN PGOOD VIN C1 Bandgap/Bias Vref . - UVLO Comp VIN Vuvlo EN VFB - Vref + + CL VOUT Peak and Valley CURRENT LIMIT Min. ON time Vout Selection Logic Pulse freq. detection VFB Compensation VSW Soft-start ramp Aux DS13206 - Rev 1 + - Vref + + PWM CTRL Logic Min. OFF time D0 VOUT VOUT VIN VSW D2 D1 Rpu Output Discharge Driver/ Anti-cross conduction circuitry L SW d High current mode TON C2 VSW Zero Crossing Comp. + - VIN - Vth 100% + 100% Mode comp. Current slew Rate CTRL VOUT2 Discharge GND VOUT Vout2 C3 page 9/23 ST1PS02 Operation description 7 Operation description The ST1PS02 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 the output voltage selection without an external resistor divider. A couple of standard digital inputs are used to configure the device to supply a fixed output voltage according to Table 2. Pin description. 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. The output discharge function is available for the ST1PS02xQTR versions. 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 Auxiliary output (Vout2) The Aux pin controls Vout2 output. It provides the same regulated voltage level as the main output (VOUT) less drop on the load switch circuitry, when Aux pin tied high. The Vout2 pin allows connecting/disconnecting the other system load to the output of the ST1PS02. 7.7 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. DS13206 - Rev 1 page 10/23 ST1PS02 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 95% 100% 90% 90% 85% 80% 80% Vin 2.8V 60% Efficiency [%] Efficiency [%] 70% Vin 3.2V Vin 3.6V 50% Vin 4.2V 40% Vin 5V 75% Iout 100A Iout 1mA 70% Iout 50mA 65% Iout 100mA 30% L= 2.2 H Cout = 10 F 20% 10% 0% 0.001 60% Iout 200mA 55% L = 2.2 H Cout = 10 F 50% 0.01 0.1 1 10 100 2.8 1000 3.3 3.8 4.3 4.8 Input voltage [V] Load current [mA] Figure 6. Efficiency vs load, VOUT = 2.5 V Figure 7. Efficiency vs VIN, VOUT = 2.5 V 100% 100% 90% 95% 80% 90% 85% Vin 3.2V 60% Vin 3.6V 50% Vin 4.2V Efficiency [%] Efficiency [%] 70% Vin 5V 40% Iout 1mA 65% Iout 100mA Iout 200mA 60% 10% L=2.2 H Cout=10 F 55% 50% 0.01 0.1 1 Load current [mA] DS13206 - Rev 1 Iout 100A 70% Cout=10 F 20% 0% 0.001 75% Iout 50mA L=2.2 H 30% 80% 10 100 1000 3.2 3.4 3.6 3.8 4 4.2 4.4 4.6 4.8 5 Input voltage [V] page 11/23 ST1PS02 Typical performance characteristics DS13206 - Rev 1 Figure 8. 100% mode, VOUT = 1.8 V, 50 mA load Figure 9. 100% mode, VOUT = 2.5 V, 50 mA load Figure 10. VOUT change, 1.8 V to 2.5 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 A 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 12/23 ST1PS02 Typical performance characteristics DS13206 - Rev 1 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 13/23 ST1PS02 Typical performance characteristics DS13206 - Rev 1 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 = 10 to 100 mA Figure 23. Start-up, VIN = 3.6 V, Vout2 = 1.8 V, no load Figure 24. Disable, VIN = 3.6 V, Vout2 = 1.8 V, no load Figure 25. Start-up, VIN = 3.6, Vout2 = 1.8 V, IOUT = 100 mA page 14/23 ST1PS02 Typical performance characteristics Figure 26. Disable, VIN = 3.6 V, Vout2 = 1.8 V, IOUT = 100 mA DS13206 - Rev 1 page 15/23 ST1PS02 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 TQFN12 (2.0x1.7x0.55 mm) package information Figure 27. TQFN12 (2.0x1.7x0.55 mm) package outline DS13206 - Rev 1 page 16/23 ST1PS02 TQFN12 (2.0x1.7x0.55 mm) package information Table 8. TQFN12 (2.0x1.7x0.55 mm) mechanical data Symbol Milimeters Min. Typ. Max. A 0.40 0.50 0.55 A1 0.00 0.03 0.05 A2 0.28 0.38 0.48 A3 0.125 b 0.15 0.20 0.25 D 1.60 1.70 1.80 E 1.90 2.00 2.10 e L 0.40 0.35 0.45 aaa 0.15 bbb 0.10 ccc 0.08 ddd 0.05 eee 0.10 0.55 Figure 28. TQFN12 (2.0x1.7x0.55 mm) recommended footprint DS13206 - Rev 1 page 17/23 ST1PS02 Ordering information 10 Ordering information Table 9. Ordering information Order codes ST1PS02AQTR ST1PS02A1QTR ST1PS02BQTR ST1PS02B1QTR ST1PS02CQTR ST1PS02C1QTR ST1PS02DQTR ST1PS02D1QTR DS13206 - Rev 1 Output voltages 1.40 V to 1.75 V, 50 mV steps 1.8 V to 2.5 V, 100 mV steps 2.6 V to 3.3 V, 100 mV steps 1.0 V to 1.35 V, 50 mV steps Output discharge Package Packing Yes No Yes No Yes TQFN12 (2.0x1.7 mm) 400 m pitch Tape and reel No Yes No page 18/23 ST1PS02 Revision history Table 10. Document revision history DS13206 - Rev 1 Date Version 17-Feb-2020 1 Changes Initial release. page 19/23 ST1PS02 Contents Contents 1 Application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 3 Functional pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 5 Electrical characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 6 ST1PS02 block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 7 Operation description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 7.1 Power save mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 7.2 Output voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 7.3 Output discharge and UVLO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 7.4 Soft-start and current limitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 7.5 100% duty cycle operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 7.6 Auxiliary output (Vout2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 7.7 Power Good flag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 8 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 9 Package information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16 9.1 10 TQFN12 (2x1.7x0.55) package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19 DS13206 - Rev 1 page 20/23 ST1PS02 List of tables List of tables Table 1. Table 2. Table 3. Table 4. Table 5. Table 6. Table 7. Table 8. Table 9. Table 10. Typical external components . . . . . . . . . . . . Pin description. . . . . . . . . . . . . . . . . . . . . . Absolute maximum ratings . . . . . . . . . . . . . Thermal data. . . . . . . . . . . . . . . . . . . . . . . Recommended operating conditions. . . . . . . Electrical characteristics . . . . . . . . . . . . . . . Output voltage settings . . . . . . . . . . . . . . . . TQFN12 (2.0x1.7x0.55 mm) mechanical data Ordering information. . . . . . . . . . . . . . . . . . Document revision history . . . . . . . . . . . . . . DS13206 - Rev 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 . 3 . 5 . 5 . 5 . 6 . 8 17 18 19 page 21/23 ST1PS02 List of figures List of figures Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. Figure 6. Figure 7. Figure 8. Figure 9. Figure 10. Figure 11. Figure 12. Figure 13. Figure 14. Figure 15. Figure 16. Figure 17. Figure 18. Figure 19. Figure 20. Figure 21. Figure 22. Figure 23. Figure 24. Figure 25. Figure 26. Figure 27. Figure 28. DS13206 - Rev 1 ST1PS02 application schematic . . . . . . . . . . . . . . . . . . . . . . TQFN12 package (top through view) . . . . . . . . . . . . . . . . . . . Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Efficiency vs load, VOUT = 1.8 V . . . . . . . . . . . . . . . . . . . . . . Efficiency vs VIN, VOUT = 1.8 V . . . . . . . . . . . . . . . . . . . . . . . Efficiency vs load, VOUT = 2.5 V . . . . . . . . . . . . . . . . . . . . . . Efficiency vs VIN, VOUT = 2.5 V . . . . . . . . . . . . . . . . . . . . . . . 100% mode, VOUT = 1.8 V, 50 mA load . . . . . . . . . . . . . . . . . 100% mode, VOUT = 2.5 V, 50 mA load . . . . . . . . . . . . . . . . . VOUT change, 1.8 V to 2.5 V to 1.8 V, IOUT = 5 mA, VIN = 3.6 V. Output ripple, VIN=3.6 V, VOUT = 1.8 V, IOUT = 10 A . . . . . . . . Output ripple, VIN=3.6 V, VOUT =1.8 V, IOUT = 1 mA. . . . . . . . . Output ripple, VIN=3.6 V, VOUT =1.8 V, IOUT = 50 mA . . . . . . . . Output ripple, VIN=3.6 V, VOUT =1.8 V, IOUT = 150 mA . . . . . . . Output ripple, VIN=3.6 V, VOUT =1.8 V, IOUT = 250 mA . . . . . . . Start-up, VIN=3.6 V, VOUT=1.8 V, no load . . . . . . . . . . . . . . . . Disable, VIN=3.6 V, VOUT =1.8 V, no load . . . . . . . . . . . . . . . . Start-up, VIN=3.6 V, VOUT=1.8 V, IOUT = 100 mA . . . . . . . . . . . Disable, VIN=3.6 V, VOUT = 1.8 V, IOUT = 100 mA . . . . . . . . . . Load transient, VIN=3.6 V, VOUT=1.8 V, IOUT =50 A to 10 mA . Load transient, VIN=3.6 V, VOUT=1.8 V, IOUT = 0 to 100 mA . . . Load transient, VIN=3.6 V, VOUT=1.8 V, IOUT = 10 to 100 mA . . Start-up, VIN = 3.6 V, Vout2 = 1.8 V, no load . . . . . . . . . . . . . . Disable, VIN = 3.6 V, Vout2 = 1.8 V, no load . . . . . . . . . . . . . . Start-up, VIN = 3.6, Vout2 = 1.8 V, IOUT = 100 mA . . . . . . . . . . Disable, VIN = 3.6 V, Vout2 = 1.8 V, IOUT = 100 mA . . . . . . . . . TQFN12 (2.0x1.7x0.55 mm) package outline . . . . . . . . . . . . . TQFN12 (2.0x1.7x0.55 mm) recommended footprint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 . 3 . 9 11 11 11 11 12 12 12 12 12 12 13 13 13 13 13 13 14 14 14 14 14 14 15 16 17 page 22/23 ST1PS02 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. 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