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Battery charger ICs

BQ25121A

ACTIVE

300-mA linear battery charger with Power Path, integrated LDO and buck converter 2.5V default output

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Data sheet

BQ25121A

ACTIVE
Data sheet Order now

Product details

Number of series cells 1 Charge current (max) (A) 0.3 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 max Vin (max) (V) 20 Control topology Linear Control interface I2C Features BAT temp thermistor monitoring (JEITA profile), IC thermal regulation, Input OVP, Integrated LDO, Integrated buck converter, Power Path Vin (min) (V) 3.4 Rating Catalog Operating temperature range (°C) -40 to 85
Number of series cells 1 Charge current (max) (A) 0.3 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 max Vin (max) (V) 20 Control topology Linear Control interface I2C Features BAT temp thermistor monitoring (JEITA profile), IC thermal regulation, Input OVP, Integrated LDO, Integrated buck converter, Power Path Vin (min) (V) 3.4 Rating Catalog Operating temperature range (°C) -40 to 85
DSBGA (YFP) 25 6.75999999999999792000000000000016 mm² 2.5999999999999996 x 2.5999999999999996
  • Increases system operation time between charges
    • Configurable 300-mA buck regulator (2.5-V default)
    • 700-nA (typical) Iq with buck converter enabled (no load)
    • Configurable load switch or 100-mA 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
    • Watchdog timer disabled
  • Highly integrated solution with small footprint
    • 2.5-mm x 2.5-mm WCSP Package and six 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
    • System output voltage adjustment
    • LDO output voltage adjustment
  • Safety-Related Certification:
    • TUV IEC 62368-1 Certification
  • Increases system operation time between charges
    • Configurable 300-mA buck regulator (2.5-V default)
    • 700-nA (typical) Iq with buck converter enabled (no load)
    • Configurable load switch or 100-mA 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
    • Watchdog timer disabled
  • Highly integrated solution with small footprint
    • 2.5-mm x 2.5-mm WCSP Package and six 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
    • System output voltage adjustment
    • LDO output voltage adjustment
  • Safety-Related Certification:
    • TUV IEC 62368-1 Certification

The BQ25121A 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 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).

The BQ25121A 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 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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Type Title Date
* Data sheet BQ25121A Low IQ Highly Integrated Battery Charge Management Solution for Wearables and IoT datasheet (Rev. A) PDF | HTML 19 Jan 2021
Application note Implementing 2-V Charge Inhibition PDF | HTML 31 May 2023
Application note BQ2512x Frequently Asked Questions 22 Nov 2021
EVM User's guide bq2512x Evaluation Module User's Guide (Rev. A) 02 May 2016

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