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, VINDPM (Input voltage threshold to maximize adaptor power) Operating Vin (Min) (V) 3.4 Rating Catalog
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, VINDPM (Input voltage threshold to maximize adaptor power) Operating Vin (Min) (V) 3.4 Rating Catalog
DSBGA (YFP) 25 0 mm² 2.508 x 2.57
  • 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 100mA LDO Output (Load Switch by 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
  • 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
  • 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 100mA LDO Output (Load Switch by 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
  • 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

The bq25120A 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 mutliple different configuration options for wake are reset optimization.

The bq25120A 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 mutliple different configuration options for wake are reset optimization.

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Technical documentation

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Type Title Date
* Data sheet bq25120A Low IQ Highly Integrated Battery Charge Management Solution for Wearables and IoT datasheet (Rev. A) 21 Nov 2017
Application note BQ2512x Frequently Asked Questions 22 Nov 2021
Technical article When to use rechargeable batteries in small battery applications 01 Oct 2019
Technical article Pull the tab: How to implement ship mode in your lithium-ion battery design 20 Feb 2019
Application note Dynamic Power-Path Mgmt & Dynamic Power Mgmt (Rev. A) 01 May 2018
Technical article Choosing the right battery charger for your portable medical device design 22 Jan 2018
Technical article The future of wearable biosensors and linear chargers 04 Dec 2017
User guide bq25120AEVM and bq25122EVM Evaluation Modules (Rev. A) 04 Dec 2017
Application note Improved Fast Charge Using the bq25120 Adjustible VBATREG, Charge Current, TS, 08 Aug 2016
User guide bq2512x Evaluation Module User's Guide (Rev. A) 02 May 2016

Design & development

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

Evaluation board

BQ25120AEVM — 700nA Low Iq Highly Integrated Battery Charge Management Evaluation Module for Wearables & Hearables

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 (...)
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Support software

BQ25120A Setup Guide Tool

SLUC696.ZIP (579 KB)
Gerber file

Linear Charger NTC Calculator

SLUC670.ZIP (350 KB)
Reference designs

PMP11311 — Power Reference Design for a Wearable Device with Wireless Charging using the bq51003 and bq25120

Wearable devices require advanced power management to achieve long battery run times with always-on functionality.  Additionally, the devices need to use small rechargeable batteries and enable small footprint designs.  This application note shows the implementation of a scalable power (...)
Reference designs

TIDA-00712 — Smartwatch Battery Management Solution Reference Design

This reference design is for smartwatch battery management solution (BMS). It is suitable for low-power wearable devices like smartwatch applications. The design includes an ultra-low current 1 cell Li-ion linear charger; a highly integrated Qi-compliant wireless power receiver; a (...)
Reference designs

TIDA-00761 — Low Power Battery Charge Management Reference Design for Wearables and IoT Applications

The TIDA-00761 is a power management solution using the bq25120 IC in a small form factor design targeted at low power wearable devices.  It integrates the most common functions for wearable devices: Linear charger, regulated output, load switch, manual reset with timer, and battery voltage (...)
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