Product details


Number of series cells 1, 2, 3, 4, 5, 6 Charge current (Max) (A) 10 Operating Vin (Max) (V) 28 Cell chemistry Lead Acid, Li-Ion/Li-Polymer, Lithium Phosphate/LiFePO4 Battery charge voltage (Min) (V) 2.1 Battery charge voltage (Max) (V) 26 Absolute Vin (safety rating) (Max) ((V)) 33 Control topology Switch-Mode Buck Control interface Standalone (RC-Settable) Features BAT temp thermistor monitoring (hot/cold profile), Input OVP, Solar input/MPPT, VINDPM (Input voltage threshold to maximize adaptor power) Operating Vin (Min) (V) 5 Rating Catalog open-in-new Find other Battery charger ICs

Package | Pins | Size

VQFN (RVA) 16 12 mm² 3.5 x 3.5 open-in-new Find other Battery charger ICs


  • Maximum Power Point Tracking (MPPT) capability by input Voltage regulation
  • Programmable MPPT setting
  • 5-V to 28-V Input solar panel
  • 600-kHz NMOS-NMOS Synchronous buck controller
  • Resistor programmable float voltage
  • Accommodates Li-Ion/Polymer, LiFePO4, lead acid chemistries
  • Accuracy
    • ±0.5% Charge voltage regulation
    • ±3% Charge current regulation
    • ±0.6% Input voltage regulation
  • High Integration
    • Internal loop compensation
    • Internal digital soft start
  • Safety
    • Input overvoltage protection
    • Battery temperature-sensing
    • Battery absent detection
    • Thermal shutdown
  • Charge status outputs for LED or host processor
  • Charge enable on MPPSET pin
  • Automatic sleep mode for low power consumption
    • < 15-µA OFF-state battery discharge current
  • Small 3.5 × 3.5 mm2 16-pin QFN package
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The BQ24650 device is a highly integrated switch-mode battery charge controller. It provides input voltage regulation, which reduces charge current when input voltage falls below a programmed level. When the input is powered by a solar panel, the input regulation loop lowers the charge current so that the solar panel can provide maximum power output.

The BQ24650 offers a constant-frequency synchronous PWM controller with high accuracy current and voltage regulation, charge preconditioning, charge termination, and charge status monitoring.

The BQ24650 charges the battery in three phases: pre-conditioning, constant current, and constant voltage. Charge is terminated when the current reaches 1/10 of the fast charge rate. The pre-charge timer is fixed at 30 minutes. The BQ24650 automatically restarts the charge cycle if the battery voltage falls below an internal threshold and enters a low quiescent current sleep mode when the input voltage falls below the battery voltage.

The BQ24650 supports a battery from 2.1 V to 26 V with VFB set to a 2.1-V feedback reference. The charge current is programmed by selecting an appropriate sense resistor. The BQ24650 is available in a 16 -pin, 3.5 mm × 3.5 mm2 thin QFN package.

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Technical documentation

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Type Title Date
* Data sheet BQ24650 Stand-Alone Synchronous Buck Battery Charge Controller for Solar Power With Maximum Power Point Tracking datasheet (Rev. B) Oct. 02, 2019
Application note How to Charge a Lead-Acid Battery With a Li-Ion Charger Apr. 29, 2020
Application note BQ241xx/BQ246xx Selection of Multi-Cell Standalone Switching Battery Chargers Dec. 31, 2019
Technical article When to use rechargeable batteries in small battery applications Oct. 01, 2019
Application note Preventing bq24650 Leakage Current When Using Shaded Solar Panels Sep. 19, 2016
Technical article Should I use a linear charger or a switching charger? Oct. 31, 2015
Technical article Summertime and the livin' is easy Jun. 20, 2014
Application note 2Q 2012 Issue Analog Applications Journal Apr. 26, 2012
Technical article A boost-topology battery charger powered from a solar panel Jan. 04, 2012
Application note 4Q 2011 Issue Analog Applications Journal Nov. 09, 2011
Application note Solar charging solution provides narrow-voltage DC/DC system bus for multicell Nov. 09, 2011
Application note Using the bq24650 to Charge a Sealed, Lead-Acid Battery (Rev. A) Oct. 04, 2011
Application note How to Review a Multicell Switching Charger Schematic Sep. 21, 2011
Application note 3Q 2011 Issue Analog Applications Journal Sep. 16, 2011
Application note Журнал по применению аналоговых компонентов 3Q 2011 Sep. 01, 2011
Application note Maximum Power Point Tracking With the bq24650 Charger. (Rev. A) Aug. 15, 2011
User guide bq24650EVM Synchronous, Switch-Mode, Battery Charge Controller for Solar Power (Rev. A) Oct. 16, 2010
Application note Using the bq24650 to Charge a LiFePO4 battery Aug. 24, 2010

Design & development

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

Hardware development

document-generic User guide

The BQ24650EVM Evaluation Module assists users in evaluating the bq24650 synchronous battery charger. The bq24650 is a highly integrated switch-mode battery charge controller. It provides input voltage regulation, which reduces charge current when input voltage falls below a programmed level. When (...)

  • Synchronous switch-mode battery charge controller for solar power
  • Resistor-programmable up to 26-V battery voltage
  • Input operating range: 5V to 28V
  • LED indication for charge status
  • Test points for key signals available for testing purposes; easy probe hook-up.
  • Jumpers available; easy-to-change setting

Design tools & simulation

SLUC175D.ZIP (782 KB)
SLUC229.ZIP (35 KB)

Reference designs

High efficiency sync switch mode charger controller solar lithium battery charger reference design
TIDA-00049 This reference design is featured in solar lithium battery applications. This design, which contains an integrated switch-mode battery charge controller, provides input voltage regulation, which reduces charge current when input voltage falls below a programmed level. When the input is powered by a (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
VQFN (RVA) 16 View options

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