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The TPS62745DSSR is a highly efficient, ultra-low-power synchronous buck converter optimised for low-power wireless applications. It provides a regulated output consuming only 400nA of quiescent current. The device is powered by two rechargeable lithium-ion batteries (the main chemistry of lithium batteries is Li-SOCl2, Li-SO2, Li-MnO2) or four to six alkaline batteries. The device has an input voltage range of up to 10V, so it can also be powered via a USB port and a thin film solar module. Output voltages are set via four VSEL pins, ranging from 1.8V to 3.3V for the TPS62745DSSR and 1.3V to 2.8V for the TPS627451. The TPS62745DSSR is paired with a small output capacitor, which is characterised by low output ripple voltage and low noise. An internal input voltage switch controlled by pin EN_VIN_SW connects the supply voltage to pin VIN_SW. This switch is dedicated to an external voltage divider that proportionally reduces the input voltage to the external ADC. This switch is automatically disconnected when the supply voltage falls below the undervoltage lockout threshold. The TPS62745DSSR is available in a small 12-pin 3mm × 2mm WSON package.

TPS62745DSSR Features

3.3V to 10V input voltage (VIN) range

400nA quiescent current typical

Up to 90% efficiency at load currents >15µA

Output current up to 300mA

Radio Frequency (RF)-friendly DCS-Control

Low output ripple voltage

16 selectable output voltages:

1.8V to 3.3V (TPS62745)

1.3V to 2.8V (TPS627451)

Integrated input voltage switch

VOUT Integrated discharge function

Open-drain power-normal output

Uses miniature 3.3µH or 4.7µH inductors

Small 3mm x 2mm WSON package

TPS62745DSSR Applications

Bluetooth low-power, RF for consumer electronics (RF4CE), short-range low-power communication technology (Zigbee)

Industrial instrumentation metering

Energy harvesting

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