TPS627451DSST.B中文资料德州仪器数据手册PDF规格书

1 Features

1• Input Voltage Range VIN from 3.3 V to 10 V

• Typical 400 nA Quiescent Current

• Up to 90% efficiency with load currents >15 μA

• Up to 300 mA Output Current

• RF Friendly DCS-Control™

• Low Output Ripple Voltage

• 16 Selectable Output Voltages from

– 1.8 V to 3.3 V (TPS62745)

– 1.3 V to 2.8 V (TPS627451)

• Integrated input voltage switch

• Integrated Discharge Function at VOUT

• Open Drain Power Good Output

• Operates with a Tiny 3.3 μH or 4.7 μH Inductor

• Small 3 mm x 2 mm WSON Package

2 Applications

• Bluetooth® Low Energy, RF4CE, Zigbee

• Industrial Metering

• Energy Harvesting

3 Description

The TPS62745 is a high efficiency ultra low power

synchronous step down converter optimized for low power wireless applications. It provides a regulated

output voltage consuming only 400-nA quiescent

current. The device operates from two rechargeable

Li-Ion batteries, Li-primary battery chemistries such as Li-SOCl2, Li-SO2, Li-MnO2 or four to six cell

alkaline batteries. The input voltage range up to 10 V

allows also operation from a USB port and thin-film

solar modules. The output voltage is set with four

VSEL pins between 1.8 V and 3.3 V for TPS62745 or

1.3 V and 2.8 V for TPS627451. TPS62745 features

low output ripple voltage and low noise with a small

output capacitor. An internal input voltage switch

controlled by pin EN_VIN_SW connects the supply voltage to pin VIN_SW. The switch is intended to be

used for an external voltage divider, scaling down the

input voltage for an external ADC. The switch is

automatically opened when the supply voltage is

below the undervoltage lockout threshold. The

TPS62745 is available in a small 12 pin 3 mm × 2

mm WSON package.