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BQ24725A

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SMBus 1-4 cell Buck battery charge controller with N-Channel power MOSFET selector

Product details

Number of series cells 1, 2, 3, 4 Charge current (max) (A) 8 Vin (max) (V) 24 Cell chemistry Li-Ion/Li-Polymer Battery charge voltage (min) (V) 1.024 Battery charge voltage (max) (V) 19.2 Absolute max Vin (max) (V) 30 Control topology Switch-Mode Buck Control interface SMBus Features Input OVP, Power Path Vin (min) (V) 4.5 Rating Catalog Operating temperature range (°C) -40 to 85
Number of series cells 1, 2, 3, 4 Charge current (max) (A) 8 Vin (max) (V) 24 Cell chemistry Li-Ion/Li-Polymer Battery charge voltage (min) (V) 1.024 Battery charge voltage (max) (V) 19.2 Absolute max Vin (max) (V) 30 Control topology Switch-Mode Buck Control interface SMBus Features Input OVP, Power Path Vin (min) (V) 4.5 Rating Catalog Operating temperature range (°C) -40 to 85
VQFN (RGR) 20 12.25 mm² 3.5 x 3.5
  • SMBus Host-controlled NMOS-NMOS synchronous buck converter with programmable 615kHz, 750kHz, and 885kHz switching frequencies
  • Automatic N-channel MOSFET selection of system power source from adapter or battery driven by internal charge pumps
  • Enhanced safety features for over voltage protection, over current protection, battery, inductor and MOSFET short circuit protection
  • Programmable input current, charge voltage, charge current limits
    • ±0.5% Charge voltage accuracy up to 19.2V
    • ±3% Charge current accuracy up to 8.128A
    • ±3% Input current accuracy up to 8.064A
    • ±2% 20x Adapter current or charge current amplifier output accuracy
  • Programmable battery depletion threshold, and battery LEARN function
  • Programmable adapter detection and indicator
  • Integrated soft start
  • Integrated loop compensation
  • Real time system control on ILIM pin to limit charge current
  • AC Adapter operating range 4.5V-24V
  • 5µA Off-state battery discharge current
  • 0.65mA (0.8mA max) Adapter standby quiescent current
  • 20-pin 3.5 x 3.5 mm2 VQFN Package
  • SMBus Host-controlled NMOS-NMOS synchronous buck converter with programmable 615kHz, 750kHz, and 885kHz switching frequencies
  • Automatic N-channel MOSFET selection of system power source from adapter or battery driven by internal charge pumps
  • Enhanced safety features for over voltage protection, over current protection, battery, inductor and MOSFET short circuit protection
  • Programmable input current, charge voltage, charge current limits
    • ±0.5% Charge voltage accuracy up to 19.2V
    • ±3% Charge current accuracy up to 8.128A
    • ±3% Input current accuracy up to 8.064A
    • ±2% 20x Adapter current or charge current amplifier output accuracy
  • Programmable battery depletion threshold, and battery LEARN function
  • Programmable adapter detection and indicator
  • Integrated soft start
  • Integrated loop compensation
  • Real time system control on ILIM pin to limit charge current
  • AC Adapter operating range 4.5V-24V
  • 5µA Off-state battery discharge current
  • 0.65mA (0.8mA max) Adapter standby quiescent current
  • 20-pin 3.5 x 3.5 mm2 VQFN Package

The BQ24725A is a high-efficiency, synchronous battery charger, offering low component count for space-constraint, multi-chemistry battery charging applications.

The BQ24725A utilizes two charge pumps to separately drive n-channel MOSFETs (ACFET, RBFET and BATFET) for automatic system power source selection.

SMBus controlled input current, charge current, and charge voltage DACs allow for very high regulation accuracies that can be easily programmed by the system power management micro-controller.

The BQ24725A uses internal input current register or external ILIM pin to throttle down PWM modulation to reduce the charge current.

The BQ24725A charges one, two, three or four series Li+ cells.

The BQ24725A is a high-efficiency, synchronous battery charger, offering low component count for space-constraint, multi-chemistry battery charging applications.

The BQ24725A utilizes two charge pumps to separately drive n-channel MOSFETs (ACFET, RBFET and BATFET) for automatic system power source selection.

SMBus controlled input current, charge current, and charge voltage DACs allow for very high regulation accuracies that can be easily programmed by the system power management micro-controller.

The BQ24725A uses internal input current register or external ILIM pin to throttle down PWM modulation to reduce the charge current.

The BQ24725A charges one, two, three or four series Li+ cells.

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Technical documentation

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Type Title Date
* Data sheet BQ24725A SMBus 1- to 4-Cell Li+ Buck Battery Charge Controller with N-Channel Power MOSFET Selector datasheet (Rev. C) PDF | HTML 02 Oct 2019
Application note Autonomous Smart Battery Guide PDF | HTML 15 Oct 2021
Technical article Using battery charger ICs to shrink your design for vacuum robots PDF | HTML 21 Mar 2018
Application note How to Review a Multicell Switching Charger Schematic 21 Sep 2011
User guide bq24735/725A Battery Charger Evaluation Module (Rev. A) 16 Aug 2011

Design & development

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

Evaluation board

BQ24725AEVM-710 — Evaluation Module for BQ24725A 1-4 Cell Li+ Battery SMBus Charge Controller

The BQ24725AEVM-710 evaluation module (EVM) is a complete charger module for evaluating a multicell synchronous notebook turbo boost charge using the bq24725A device. It is designed to deliver up to 4 A of charge current to Li-ion or Li-polymer applications. The charge current is programmable by (...)

User guide: PDF
Not available on TI.com
Application software & framework

TI-CHARGER-GUI — GUI software for use with USB2ANY & battery charging evaluation modules

The TI-CHARGER-GUI offers a web-based or standalone graphical user interface to assist in the process of evaluating, designing with, configuring or testing battery charger products. The software provides full access to registers and an easy interface to send and sequence commands.
GUI for evaluation module (EVM)

SLUC258 bq24725A/735/728/738 SMBus Gui

Supported products & hardware

Supported products & hardware

Products
Battery charger ICs
BQ24725A SMBus 1-4 cell Buck battery charge controller with N-Channel power MOSFET selector BQ24735 SMBus 1-4 cell Buck battery charge controller to support turbo boost mode
Calculation tool

SLUC203 bq24725_725A_726_707_73x Calculation Tool

Supported products & hardware

Supported products & hardware

Products
Battery charger ICs
BQ24707 SMBus 1-4 cell Buck battery charge controller with independent comparator and circuit protection BQ24707A 1-4 cell Li-ion battery charge controller with independent comparator and advanced circuit prot. BQ24725 SMBus 2-4 cell Buck battery charge controller with N-Channel power MOSFET selector BQ24725A SMBus 1-4 cell Buck battery charge controller with N-Channel power MOSFET selector BQ24735 SMBus 1-4 cell Buck battery charge controller to support turbo boost mode
Reference designs

PMP21618 — Universal input reference design for 12-V lead acid battery charger

This reference design takes a Universal AC input (85 VAC - 265 VAC) and converts to a 17.5-V isolated output using a PSR flyback topology. It is then followed by a battery charger circuit, which outputs up to 15 V to a lead acid battery. This is a fast-charge design capable of delivering 12 V @ (...)
Test report: PDF
Schematic: PDF
Package Pins Download
VQFN (RGR) 20 View options

Ordering & quality

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Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

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