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BQ24650

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Standalone 1-6 cell Buck battery charge controller with solar input and integrated MPPT

Product details

Number of series cells 1, 2, 3, 4, 5, 6 Charge current (max) (A) 10 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 max Vin (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) Vin (min) (V) 5 Rating Catalog Operating temperature range (°C) -40 to 85
Number of series cells 1, 2, 3, 4, 5, 6 Charge current (max) (A) 10 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 max Vin (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) Vin (min) (V) 5 Rating Catalog Operating temperature range (°C) -40 to 85
VQFN (RVA) 16 12.25 mm² 3.5 x 3.5
  • 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
  • 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

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.

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) PDF | HTML 02 Oct 2019
Application note How to Charge a Lead-Acid Battery With a Li-Ion Charger 29 Apr 2020
Application note BQ241xx/BQ246xx Selection of Multi-Cell Standalone Switching Battery Chargers 31 Dec 2019
Application note Preventing bq24650 Leakage Current When Using Shaded Solar Panels 19 Sep 2016
Analog Design Journal 2Q 2012 Issue Analog Applications Journal 26 Apr 2012
Analog Design Journal 4Q 2011 Issue Analog Applications Journal 09 Nov 2011
Analog Design Journal Solar charging solution provides narrow-voltage DC/DC system bus for multicell 09 Nov 2011
Application note Using the bq24650 to Charge a Sealed, Lead-Acid Battery (Rev. A) 04 Oct 2011
Application note How to Review a Multicell Switching Charger Schematic 21 Sep 2011
Analog Design Journal 3Q 2011 Issue Analog Applications Journal 16 Sep 2011
Analog Design Journal Журнал по применению аналоговых компонентов 3Q 2011 01 Sep 2011
Application note Maximum Power Point Tracking With the bq24650 Charger. (Rev. A) 15 Aug 2011
User guide bq24650EVM Synchronous, Switch-Mode, Battery Charge Controller for Solar Power (Rev. A) 16 Oct 2010
Application note Using the bq24650 to Charge a LiFePO4 battery 24 Aug 2010

Design & development

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

Evaluation board

BQ24650EVM-639 — BQ24650 Evaluation Module Synchronous, Switch-Mode, Battery Charge Controller for Solar Power

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 (...)

User guide: PDF
Not available on TI.com
Calculation tool

SLUC175 bq246xx Calculation Tool V1.5

Supported products & hardware

Supported products & hardware

Products
Battery charger ICs
BQ24600 Standalone 1-6 cell Buck battery charge controller BQ24610 Standalone 1-6 cell Buck battery charge controller with 5V-28V input BQ24616 Standalone 1-6 cell Buck battery charge controller with JEITA compliance BQ24617 Standalone 1-5 cell Buck battery charge controller with 5V-24V input BQ24618 Standalone 1-6 cell Buck battery charge controller USB friendly with 5V-28V input BQ24620 Standalone 1-7 cell Buck battery charge controller for Lithium phosphate batteries BQ24630 Standalone 1-7 cell Buck battery charge controller for LiFePO4 batteries with system power BQ24640 Standalone 1-8 cell Buck battery charge controller for super capacitor BQ24650 Standalone 1-6 cell Buck battery charge controller with solar input and integrated MPPT
Calculation tool

SLUC229 MPP Tracking with bq24650 and NTC Thermistor

Supported products & hardware

Supported products & hardware

Products
Battery charger ICs
BQ24650 Standalone 1-6 cell Buck battery charge controller with solar input and integrated MPPT
Reference designs

TIDA-00049 — High efficiency sync switch mode charger controller solar lithium battery charger reference design

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 (...)
Test report: PDF
Schematic: PDF
Package Pins Download
VQFN (RVA) 16 View options

Ordering & quality

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Information included:
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  • Assembly location

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