BQ25172: 800-mA Linear Battery Charger for 1- to 6-Cell NiMH Batteries

1 Features

Input voltage up to 30-V tolerant
Automatic Sleep Mode for low power consumption
- 350-nA battery leakage current
- 85-µA input leakage current when charge disabled
Supports 1- to 6-cell NiMH with intermittent-charging
External resistor programmable operation
- VSET to set NiMH series cell-count from 1s to 6s
- ISET to set charge current from 10 mA to 800 mA
- TMR to set charge safety timer duration from
  4 hr to 22 hr
High accuracy
- ±0.5% charge voltage accuracy
- ±10% charge current accuracy
Charging features
- NTC thermistor input to monitor battery temperature
- Cold and hot temperature charging disabled
- V_{OUT_OVP} reduced at cool temperatures
- TS pin for charging function control
- Open-drain output for status and fault indication
Integrated fault protection
- 18-V IN overvoltage protection
- VSET based OUT overvoltage protection
- 1000-mA overcurrent protection
- 125°C thermal regulation; 150°C thermal shutdown protection
- OUT short-circuit protection
- VSET, ISET, TMR pins short/open protection