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Product details

Parameters

Number of series cells 1 Charge current (Max) (A) 0.8 Operating Vin (Max) (V) 6.5 Cell chemistry Li-Ion/Li-Polymer, Lithium Phosphate/LiFePO4 Battery charge voltage (Min) (V) 3.5 Battery charge voltage (Max) (V) 4.4 Absolute Vin (safety rating) (Max) ((V)) 30 Control topology Linear Control interface Standalone, Standalone (RC-Settable) Features BAT temp thermistor monitoring (hot/cold profile), IC thermal regulation, IINDPM (Input current limit) Operating Vin (Min) (V) 3 Rating Catalog open-in-new Find other Battery charger ICs

Package | Pins | Size

WSON (DSG) 8 4 mm² 2 x 2 open-in-new Find other Battery charger ICs

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-cell Li-Ion, Li-Poly, and LiFePO4
  • External resistor programmable operation
    • VSET to set battery regulation voltage:
      • Li-Ion: 4.05 V, 4.1 V, 4.2 V, 4.35 V, 4.4 V
      • LiFePO4: 3.5 V, 3.6 V, 3.7 V
    • ISET to set charge current from 10 mA to 800 mA
  • High accuracy
    • ±0.5% charge voltage accuracy
    • ±10% charge current accuracy
  • Charging features
    • Precharge current 20% of ISET
    • Termination current 10% of ISET
    • NTC thermistor input to monitor battery temperature
    • TS pin for charging function control
    • Open-drain output for status and fault indication
    • Open-drain output for power good indication
  • Integrated fault protection
    • 6.6-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 pins short/open protection
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Description

The BQ25170 is an integrated 800-mA linear charger for 1-cell Li-Ion, Li-Polymer, and LiFePO4 batteries targeted at space-limited portable applications. The device has a single power output that charges the battery. The system load can be placed in parallel with the battery, as long as the average system load does not prevent the battery from charging fully within the safety timer duration. When the system load is placed in parallel with the battery, the charge current is shared between the system and the battery.

The device has three phases for charging a Li-Ion battery: precharge to recover a fully discharged battery, fast-charge constant current to supply the bulk of the charge, and voltage regulation to reach full capacity.

In all charge phases, an internal control loop monitors the IC junction temperature and reduces the charge current if an internal temperature threshold, TREG, is exceeded.

The charger power stage and charge current sense functions are fully integrated. The charger function has high accuracy current and voltage regulation loops, charge status display, and automatic charge termination. The charge voltage and fast charge current are programmable through external resistors. The precharge and termination current threshold track the fast charge current setting.

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NEW BQ25175 PREVIEW Standalone 1-cell 800-mA linear battery charger in a WCSP package Is available in a WCSP package

Technical documentation

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Type Title Date
* Data sheet BQ25170: 800-mA Linear Battery Charger for 1-Cell Li-Ion, and LiFePO4 datasheet (Rev. A) Apr. 14, 2021
User guide BQ25170EVM Evaluation Module (Rev. A) Jun. 10, 2021
Certificate BQ25170EVM EU Declaration of Conformity (DoC) Aug. 13, 2020
Technical article When to use rechargeable batteries in small battery applications Oct. 01, 2019
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
49
Description
The BQ25170EVM is designed to help the user evaluate and test the various operating modes of the BQ25170 device. The user’s guide includes setup instructions for the hardware, a schematic diagram, a bill of materials (BOM), and PCB layout drawings for the evaluation module. 
Features
  • Complete solution for evaluation of the small form factor linear charger capable of providing up to 800 mA to a single li-ion or LiFePO4 battery
  • Popular configuration can be selected using the switches
  • Adjustments for charge current over a wide range along with TS sensing

CAD/CAE symbols

Package Pins Download
WSON (DSG) 8 View options

Ordering & quality

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  • Qualification summary
  • Ongoing reliability monitoring

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