Product details

Number of series cells 1 Charge current (Max) (A) 1 Operating Vin (Max) (V) 10.2 Cell chemistry Lithium Phosphate/LiFePO4 Battery charge voltage (Min) (V) 3.5 Battery charge voltage (Max) (V) 3.5 Absolute Vin (safety rating) (Max) ((V)) 30 Control interface Standalone (RC-Settable) Features IC thermal regulation, Input OVP Operating Vin (Min) (V) 3.75 Rating Catalog
Number of series cells 1 Charge current (Max) (A) 1 Operating Vin (Max) (V) 10.2 Cell chemistry Lithium Phosphate/LiFePO4 Battery charge voltage (Min) (V) 3.5 Battery charge voltage (Max) (V) 3.5 Absolute Vin (safety rating) (Max) ((V)) 30 Control interface Standalone (RC-Settable) Features IC thermal regulation, Input OVP Operating Vin (Min) (V) 3.75 Rating Catalog
WSON (DQC) 10 6 mm² 3 x 2
  • Single Cell LiFePO4 Charging Algorithm
  • 30V Input Rating, With 10.5 V Overvoltage
    Protection (OVP)
  • 50mA 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
  • Single Cell LiFePO4 Charging Algorithm
  • 30V Input Rating, With 10.5 V Overvoltage
    Protection (OVP)
  • 50mA 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

The 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.

The LiFePO4 charging algorithm removes the current taper typically seen as part of the constant voltage mode control used in Li-Ion battery charge cycles which reduces charge time significantly. Instead, the battery is fast charged to the overcharge voltage and then allowed to relax to a lower float charge voltage threshold. The charger integrates the power stage with the charge current and voltage sense to achieve a high level of accuracy in the current and voltage regulation loops. An internal control loop monitors the IC junction temperature through the charge cycle and reduces the charge current if an internal temperature threshold is exceeded.

The 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.

The LiFePO4 charging algorithm removes the current taper typically seen as part of the constant voltage mode control used in Li-Ion battery charge cycles which reduces charge time significantly. Instead, the battery is fast charged to the overcharge voltage and then allowed to relax to a lower float charge voltage threshold. The charger integrates the power stage with the charge current and voltage sense to achieve a high level of accuracy in the current and voltage regulation loops. An internal control loop monitors the IC junction temperature through the charge cycle and reduces the charge current if an internal temperature threshold is exceeded.

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Technical documentation

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Type Title Date
* Data sheet bq25071 1-A, Single-Input, Single-Cell LiFePO4 Linear Battery Charger with 50 mA LDO datasheet 16 Jul 2014
Technical article When to use rechargeable batteries in small battery applications 01 Oct 2019
Technical article A complete low-voltage backup battery solution for eCall systems 05 Mar 2016
Technical article Should I use a linear charger or a switching charger? 31 Oct 2015
Technical article Summertime and the livin' is easy 20 Jun 2014
User guide User's Guide for bq25071 EVM 17 Jun 2014

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Reference designs

PMP9769 — Automotive eCall Power Supply Reference Design with Low Intermediate Voltage

This reference design includes a complete power management solution for a standalone emergency call (eCall) system in an automotive environment. The circuit is supplied directly from the car battery rail. It also manages a backup battery to power the eCall system while the car battery rail is not (...)
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