STEVAL-1PS02B Data brief Evaluation board based on ST1PS02BQTR 400 mA nano-quiescent synchronous step-down converter with AUX switch Features 1.8 V to 5.5 V input operating range Up to 400 mA output current capability Tiny external components: L=2.2 H typ. Dynamically selectable output voltages from 1.8 V to 2.5 V Output voltage Power Good Auxiliary load switch Vout2 (AUX control input) WEEE and RoHS compliant (hardware only) Description The STEVAL-1PS02B evaluation board demonstrates a smart converter design able to deliver up to 400 mA output current from a 1.8 V to 5.5 V input, with a dynamically adjustable1.8 V to 2.5 V output voltage. The board features the ST1PS02BQTR nano-quiescent miniaturized synchronous step-down converter which implements enhanced peak current control (PCC) and advanced design circuitry to minimize quiescent current. The device embeds a controlled load switch to supply a subsystem with same voltage rail. The board demonstrates how highly efficient conversion can be achieved with just the ST1PS02BQTR, a 2.2 H inductor and two small capacitors. The board highlights key application benefits made possible by the ST1PS02BQTR, including high efficiency and small PCB size and thickness, and is ideal for power management solutions in wearable applications and fitness accessories, personal Product summary tracking monitors, smart watches, sports bands, energy harvesting, wireless sensors, evaluation board for industrial sensors, portable low power devices, single cell Li-Ion battery applications, ST1PS02 step-down STEVAL-1PS02B and Bluetooth low energy and Zigbee applications. converter The device used on this board is supplied in the thin TQFN12 (2.0x1.7 mm) package, 400mA nano- but other packages are also available. quiescent synchronous step- down converter with ST1PS02BQTR digital voltage selection, Power Good and AUX switch Applications Buck Converter DB4160 - Rev 1 - April 2020 www.st.com For further information contact your local STMicroelectronics sales office.STEVAL-1PS02B Schematic diagrams DB4160 - Rev 1 page 2/4 1 Schematic diagrams Figure 1. STEVAL-1PS02B schematic diagram CN2 VIN F Header 3 CN3 VIN F ST1PS02B TP1 JP2 R1 1 AUX 7 PGOOD 2 Header 3 1 JP1 L1 3 SW Header 2 12 EN CN8 5 VOUT F VOUT R2 4 8 CL VOUT S 3 GND S 2 C2 CN1 GND F 1 VIN F 2 VIN 4 GND VIN S Header 4 GND S C1 CN7 GND F 6 VOUT2 F VOUT 2 4 VOUT2 S Header 4 3 GND S 2 C3 GND F CN6 1 D0 D1 D2 VIN F Header 4 109 11 Header 3 CN5 VIN F Header 3 CN4 VIN F Header 3