Product details


Number of series cells 1 Charge current (Max) (A) 0.8 Operating Vin (Max) (V) 6.5 Cell chemistry Li-Ion/Li-Polymer Battery charge voltage (Min) (V) 4.35 Battery charge voltage (Max) (V) 4.35 Absolute Vin (safety rating) (Max) ((V)) 30 Control topology Linear Control interface Standalone (RC-Settable) Features BAT temp thermistor monitoring (JEITA profile), IC thermal regulation Operating Vin (Min) (V) 3 Rating Catalog open-in-new Find other Battery charger ICs

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  • Input voltage up-to 30-V tolerant
  • Automatic Sleep Mode for low power consumption
    • 350-nA battery leakage current
    • 80-µA input leakage current when charge disabled
  • Supports 1-cell Li-Ion, and Li-Poly
  • Fixed 4.35-V battery regulation voltage

  • External resistor programmable operation
    • 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
    • Cold and hot temperature charging disabled
    • Cool temperature charging at 20% of ISET
    • TS pin for charging function control
    • Open-drain output for status and fault indication
  • Integrated fault protection
    • 6.6-V IN overvoltage protection
    • 1000-mA overcurrent protection
    • 125°C thermal regulation; 150°C thermal shutdown protection
    • OUT short-circuit protection
    • ISET pin short/open protection
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The BQ25175 is an integrated 800-mA linear charger for 1-cell Li-Ion batteries.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 fast charge current is programmable through external resistor. The precharge and termination current threshold track the fast charge current setting.

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Technical documentation

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Type Title Date
* Data sheet BQ25175 Standalone, 800-mA Linear Charger for 1-Cell Li-Ion datasheet Jun. 02, 2021
User guide BQ25175EVM User's Guide May 26, 2021
Certificate BQ25175EVM EU RoHS Declaration of Conformity (DoC) May 21, 2021
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

document-generic User guide
The BQ25175EVM evaluation module (EVM) is designed to evaluate and test the various operating modes of the BQ25175, a Li-ion and Li-poly chemistry battery charger IC for 4.35-V single cell. Charging current can be set from 60 mA to 600 mA with external resistor on ISET.
  • Complete solution for evaluation of the small form factor linear charger capable of providing up to 800 mA to a single Li-ion battery
  • Adjustements for charging current over a wide range also TS sensing

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