1 Features

1• Resistor Programmable Input Current Limit

– ±10% Current accuracy at 500 mA over full

temperature range

– Programmable from 100 mA up to 1500 mA

• Snooze mode draws only 2 μA (typical) quiescent

current

• Designed to charge large capacitor values in the

Farad range

• Up to 92% Efficiency

• Power good indicates appropriate output voltage

level even in shutdown

• VIN range from 2.3 V to 6 V

• Adjustable output voltage up to 6.5 V

• 100% Duty-cycle mode when VIN > VOUT

• Load disconnect and reverse current protection

• Short-circuit protection

• Typical operating frequency 3.5 MHz

• Available in a 2 × 2-mm WSON-8 package

• Create a custom design using the TPS61251 with

the WEBENCH® Power Designer

2 Applications

• Current limited applications with high peak power

loads (SSD, PCMCIA Tx bursts, memory,

GPRS/GSM Tx)

• Li-Ion applications

• Battery backup applications

• Audio applications

• RF-PA buffer

3 Description

The TPS61251 device provides a power supply

solution for products powered by either a three-cell,

NiCd or NiMH battery, or a one-cell Li-Ion or Lipolymer

battery. The wide input voltage range is ideal

to power portable applications like mobile phones,

solid state drives (SSD) and wireless modems. The

converter is designed to charge large capacitors in

the Farad range to support battery back up

applications. During capacitor charging, the

TPS61251 device is working as a constant current

source until VOUT has reached its programmed value.

The charge current can be programmed by an

external resistor RILIM and provides a ±10% accuracy

for the 500-mA average input current limit.