Product details


Number of series cells 1 Charge current (Max) (A) 0.3 Operating Vin (Max) (V) 5.5 Cell chemistry Li-Ion/Li-Polymer Battery charge voltage (Min) (V) 3.6 Battery charge voltage (Max) (V) 4.65 Absolute Vin (safety rating) (Max) ((V)) 20 Control interface I2C Features BAT temp thermistor monitoring (JEITA profile), IC thermal regulation, Input OVP, Integrated LDO, Integrated buck converter, Power Path Operating Vin (Min) (V) 3.4 Rating Catalog open-in-new Find other Battery charger ICs

Package | Pins | Size

DSBGA (YFP) 25 0 mm² 2.508 x 2.57 open-in-new Find other Battery charger ICs


  • Increases system operation time between charges
    • Configurable 300-mA buck regulator (1.8 V default)
    • 700-nA (typical) Iq with buck converter enabled (No Load)
    • Configurable load switch or 100-mA LDO output (1.8 V default)
    • Up to 300-mA charge current for fast charging
    • 0.5% Accurate battery voltage regulation (configurable from 3.6 V to 4.65 V in 10-mV steps)
    • Configurable termination current down to 500 µA
    • Simple voltage based battery monitor
    • Watchdog timer enabled by default
    • VDPPM Loop disabled
    • VINDPM Disabled by default to support low voltage charging
  • Highly integrated solution with small footprint
    • 2.5 mm x 2.5 mm WCSP Package and 6 external components for minimal solution
    • Push-button wake-up and reset with adjustable timers
    • Power path management for powering the system and charging the battery
    • Power path management enables <50 nA ship mode battery quiescent current for longest shelf life
    • Battery charger operates from 3.4 V – 5.5 VIN (5.5-V OVP / 20-V tolerant)
    • Dedicated pins for input current limit, charge current, termination current, and status output
  • I2C Communication control
    • Charge voltage and current
    • Termination threshold
    • Input current limit
    • VINDPM Threshold
    • Timer options
    • Load switch control
    • Controls for interrupts for faults and status
    • System output voltage adjustment
    • LDO Output voltage adjustment
  • Safety-Related Certification:
    • TUV IEC 62368-1 Certification
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The BQ25125 is a highly integrated battery charge management IC that integrates the most common functions for wearable devices: Linear charger, regulated output, load switch, manual reset with timer, and battery voltage monitor. The integrated buck converter is a high efficiency, low IQ switcher using DCS-Control™ that extends light load efficiency down to 10-µA load currents.

The low quiescent current during operation and shutdown enables maximum battery life. The device supports charge currents from 5 mA to 300 mA. The input current limit, charge current, buck converter output voltage, LDO output voltage, and other parameters are programmable through the I2C interface.

The battery is charged using a standard Li-Ion charge profile with three phases: precharge, constant current and constant voltage. A voltage-based JEITA compatible battery pack thermistor monitoring input (TS) is included that monitors battery temperature and automatically changes charge parameters to prevent the battery from charging outside of its safe temperature range. The charger is optimized for 5-V USB input, with 20-V tolerance to withstand line transients. The buck converter is run from the input or battery. When in battery only mode, the device can run from a battery up to 4.65 V.

A configurable load switch allows system optimization by disconnecting infrequently used devices. The manual reset with timer allows multiple different configuration options for wake are reset optimization. A simple voltage based monitor provides battery level information to the host in 2% increments from 60% to 100% of the programmed V(BATREG).

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Technical documentation

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Type Title Date
* Data sheet BQ25125 Low Iq Highly Integrated Battery Charge Management Solution datasheet (Rev. A) Jan. 20, 2021
White paper Overcoming Low-IQ Challenges in Low-Power Applications (Rev. A) Sep. 15, 2021
White paper 克服低功耗應用中的低 IQ 挑戰 Mar. 11, 2021
White paper 저전력 애플리케이션의 저 IQ 문제점 극복 Mar. 11, 2021
Technical article When to use rechargeable batteries in small battery applications Oct. 01, 2019
Technical article Pull the tab: How to implement ship mode in your lithium-ion battery design Feb. 20, 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

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Hardware development

document-generic User guide
The bq25120AEVM evaluation module is a highly integrated battery charge management IC that integrates the most common functions for wearables devices: linear charger, regulated output, load switch, manual reset with timer, and battery voltage monitor. The low quiescent current during operation and (...)
  • Configurable 300mA buck regulator (1.8V default)
  • 700nA typical IQ with PWM enabled (no load)
  • Up to 300mA charge current for fast charging
  • 0.5% accurate battery voltage regulation (configurable from 3.6V to 4.65V in 10mV steps)
  • Configurable termination current down to 500µA
document-generic User guide

The EV2400 EVM interface board enables an IBM-compatible or other type PC (with the required driver for its particular platform) to communicate with the Texas Instruments SMBus or I2C interface gas gauges via a Universal Serial Bus (USB) port. In addition to this board, PC software is required to (...)

  • Fully powered from the USB port
  • Optional 5-V port for powering high power voltage drivers (future upgrade)
  • Complete interface between the USB and SMBus, I2C (8/16) interfaces
  • Expansion port for future upgrades

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