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Product details

Parameters

Number of series cells 1, 2, 3, 4 Charge current (Max) (A) 8 Operating 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 Vin (safety rating) (Max) ((V)) 30 Control topology Switch-Mode Buck Control interface SMBus Features Input OVP, Power Path Operating Vin (Min) (V) 4.5 Rating Catalog open-in-new Find other Battery charger ICs

Package | Pins | Size

VQFN (RGR) 20 12 mm² 3.5 x 3.5 open-in-new Find other Battery charger ICs

Features

  • 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

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Description

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

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 7
Type Title Date
* Datasheet BQ24725A SMBus 1- to 4-Cell Li+ Buck Battery Charge Controller with N-Channel Power MOSFET Selector datasheet (Rev. C) Oct. 02, 2019
Technical articles When to use rechargeable batteries in small battery applications Oct. 01, 2019
Technical articles Using battery charger ICs to shrink your design for vacuum robots Mar. 21, 2018
Technical articles Understanding battery charger features and charging topologies Sep. 19, 2016
Technical articles Should I use a linear charger or a switching charger? Oct. 30, 2015
Application note How to Review a Multicell Switching Charger Schematic Sep. 21, 2011
User guide bq24735/725A Battery Charger Evaluation Module (Rev. A) Aug. 16, 2011

Design & development

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

Hardware development

EVALUATION BOARD Download
49
Description

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 (...)

Features
  • Evaluation module for bq24725A
  • High-efficiency NMOS-NMOS synchronous buck charger with 750-kHz frequency
  • High-efficiency and low-cost NMOS power path selector and integrated gate driver
  • User-selectable 1-cell, 2-cell, 3-cell, or 4-cell Li-ion battery voltage
  • Programmable battery voltage, charge current (...)

Software development

GUI FOR EVALUATION MODULE (EVM) Download
SLUC258A.ZIP (2259 KB)

Design tools & simulation

CALCULATION TOOL Download
SLUC203A.ZIP (394 KB)

Reference designs

REFERENCE DESIGNS Download
Universal input reference design for 12-V lead acid battery charger
PMP21618 — 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 @ 2.5 (...)
document-generic Schematic

CAD/CAE symbols

Package Pins Download
VQFN (RGR) 20 View options

Ordering & quality

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  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

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