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Product details

Parameters

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 topology Linear 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

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 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

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Description

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

= Featured
No results found. Please clear your search and try again. View all 4
Type Title Date
* Datasheet BQ25125 Low IQ Highly Integrated Battery Charge Management Solution For Wearables and IoT datasheet Jun. 10, 2019
Technical articles When to use rechargeable batteries in small battery applications Oct. 01, 2019
Technical articles Should I use a linear charger or a switching charger? Oct. 30, 2015
Technical articles 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

EVALUATION BOARDS Download
document-generic User guide
$99.00
Description
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 (...)
Features
  • 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
INTERFACE ADAPTERS Download
document-generic User guide
$199.00
Description

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 (...)

Features
  • 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

Design tools & simulation

CALCULATION TOOLS Download
SLURAY9.ZIP (580 KB)

CAD/CAE symbols

Package Pins Download
DSBGA (YFP) 25 View options

Ordering & quality

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