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.