bq25071 LiFePO4 Linear Battery Charger

bq25071 LiFePO4 Linear Battery Charger

Texas Instruments' bq25071 is a highly integrated, linear, LiFePO4 battery charger targeted at space-limited portable applications. It accepts power from either a USB port or AC adapter and charges a single-cell LiFePO4 battery with up to 1 A of charge current. The 30 V input rating with 10.5 V input overvoltage protection supports low-cost unregulated adapters.

The bq25071 has a single power output that simultaneously charges the battery and powers the system. The input current is programmable from 100 mA up to 1 A using the ISET input or configurable for USB500. There is also a 4.9 V ±10% 50 mA LDO integrated into the IC for supplying low-power external circuitry.

Applications include smart phones, mobile phones, portable media players, and low-power handheld devices.

  • Single-cell LiFePO4 charging algorithm
  • 30 V input rating, with 10.5 V Overvoltage Protection (OVP)
  • 50 mA integrated low dropout linear regulator (LDO)
  • Programmable charge current through ISET and EN terminals
  • 7% charge current regulation accuracy
  • Thermal regulation and protection
  • Soft-start feature to reduce inrush current
  • Battery NTC monitoring
  • Charging status indication