BQ25120 is not recommended for new designs.
This product continues to be in production to support existing customers. Please consider one of these alternatives:
Exact equivalent in functionality and parametrics to the compared device:
BQ25120A ACTIVE 300-mA linear battery charger with Power Path, integrated LDO and buck converter 1.8V default output This product is 300mA, 1S I2C linear charger, with integrated LDO and a Buck Converter
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Product details

Parameters

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Features

  • 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 × 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
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Description

The bq2512x 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. 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

= Top documentation for this product selected by TI
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Type Title Date
* Datasheet bq2512x 700-nA Low IQ Highly Integrated Battery Charge Management Solution for Wearables and IoT datasheet (Rev. C) Jun. 03, 2016
Technical articles When to use rechargeable batteries in small battery applications Oct. 01, 2019
Application note Improved Fast Charge Using the bq25120 Adjustible VBATREG, Charge Current, TS, Aug. 08, 2016
User guide bq2512x Evaluation Module User's Guide (Rev. A) May 02, 2016
User guide Power Management Reference Design for a Wearable Device with Wireless Charging (Rev. A) Apr. 14, 2016
Technical articles Powering IoT devices with small rechargeable batteries Mar. 29, 2016
Technical articles Should I use a linear charger or a switching charger? Oct. 30, 2015
Technical articles How to design wearables that are smaller and go longer between charges Oct. 01, 2015
User guide BQ25120 Low Iq Impact Calculator Aug. 24, 2015

Design & development

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