BQ24650 High efficiency synchronous switch-mode charger controller – solar battery charger |

This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.
High efficiency synchronous switch-mode charger controller – solar battery charger



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.


  • 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

All trademarks are the property of their respective owners.


Compare all products in Battery charger ICs Email Download to Excel
Part number Order Number of series cells Function Cell chemistry Charge current (Max) (A) Operating Vin (Min) (V) Operating Vin (Max) (V) Absolute Vin (safety rating) (Max) ((V)) Battery charge voltage (Min) (V) Battery charge voltage (Max) (V) Features Control interface Control topology Rating Operating temperature range (C) Package Group Package size: mm2:W x L (PKG)
BQ24650 Order now 1
Charger     Lead Acid
Lithium Phosphate/LiFePO4    
10     5     28     33     2.1     26     OVP
Solar Input
Temp Monitoring (Thermistor Pin)
Standalone (RC-Settable)     Switch-Mode Buck     Catalog     -40 to 85     VQFN | 16     16VQFN: 12 mm2: 3.5 x 3.5 (VQFN | 16)