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Product details

Parameters

Number of series cells 1 Charge current (Max) (A) 1 Operating Vin (Max) (V) 8 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 topology Linear Control interface Standalone (RC-Settable) Features IC thermal regulation, Input OVP Operating Vin (Min) (V) 3.75 Rating Automotive open-in-new Find other Battery charger ICs

Package | Pins | Size

WSON (DQC) 10 6 mm² 3 x 2 open-in-new Find other Battery charger ICs

Features

  • Qualified for Automotive Applications
  • AEC-Q100 Qualified With the Following Results:
    • Device Temperature Grade 1: –40°C to 125°C
      Ambient Operating Temperature Range
    • Device HBM ESD Classification Level H2
    • Device CDM ESD Classification Level C5
  • 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
  • Thermal Regulation and Protection
  • Soft-Start Feature to Reduce Inrush Current
  • Battery NTC Monitoring
  • Charging Status Indication
  • 10-Pin SON (2mm x 3mm) Package with Wettable
    Flanks
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Description

The bq25071-Q1 is a highly integrated, linear, LiFePO4 battery charger targeted at space-limited automotive 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 supports low-cost unregulated adapters.

The bq25071-Q1 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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NEW BQ25171-Q1 ACTIVE Automotive, 800-mA linear battery charger for 1- to 2-cell Li-ion, LiFePO4, and 1- to 6-cell NiMH This product is an automotive 800-mA Linear Battery Charger for single and multicell Li-ion, LiFePO4 and NiMH

Technical documentation

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Type Title Date
* Data sheet bq25071-Q1 1-A, Automotive Qualified, Single-Cell LiFePO4 Linear Battery Charger with 50-mA LDO datasheet Apr. 21, 2016
Technical article When to use rechargeable batteries in small battery applications Oct. 01, 2019
Technical article Is a LiFePO4 or Lithium-ion battery better for eCall systems? Oct. 25, 2016
Technical article Should I use a linear charger or a switching charger? Oct. 31, 2015
Technical article Summertime and the livin' is easy Jun. 20, 2014

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARD Download
document-generic User guide
99
Description

The bq25071 evaluation module (EVM) is a complete charger module for evaluating the QFN packaged 1-A battery charge solution for single-cell, LiFePO4 battery-powered systems used in a wide range of portable applications

Features
  • Programmable battery charge current via external resistors and digital input pins
  • Adapter input operating range of 3.75 V – 10.2 V
  • LED indication for charge
  • Test points for key signals available for testing purposes.

CAD/CAE symbols

Package Pins Download
WSON (DQC) 10 View options

Ordering & quality

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  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

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