Product details


Number of series cells 1, 2, 3, 4, 5, 6, 7, 8 Charge current (Max) (A) 10 Operating Vin (Max) (V) 28 Cell chemistry SuperCap 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) 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


  • Charge Super Capacitor Pack From 2.1 V to 26 V
  • CC/CV Charge Profile From 0 V Without
  • 600-kHz NMOS-NMOS Synchronous Buck
  • Over 90% Efficiency for up to 10-A Charge
  • 5-V to 28-V VCC Input Voltage Range
  • Accuracy
    • ±0.5% Charge Voltage Regulation
    • ±3% Charge Current Regulation
  • High Integration
    • Internal Loop Compensation
    • Internal Digital Soft Start
  • Safety
    • Input Overvoltage Protection
    • Capacitor Temperature Sensing Hot and Cold
      Charge Suspend
    • Thermal Shutdown
  • Status Outputs
    • Adapter Present
    • Charger Operation Status
  • Charge Enable Pin
  • 30-ns Driver Dead Time and 99.5% Maximum
    Effective Duty Cycle
  • Automatic Sleep Mode for Low Power
    • <15-µA Off-State Super Capacitor Discharge
    • <1.5-mA Off-State Input Quiescent Current
    • Memory Backup Systems
    • Industrial UPS Systems and Power Transient Buffering
    • Bridge Power to Buffer the Battery

All other trademarks are the property of their respective owners

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The bq24640 device is a highly integrated switched-mode super capacitor charge controller. The device offers a constant-frequency synchronous PWM controller with high accuracy charge current, voltage regulation, and charge status monitoring.

The bq24640 charges a super capacitor in two phases: constant current and constant voltage (CC/CV). The device can charge super capacitors from 0 V with current set on the ISET pin. When the super capacitor voltage reaches the programmed target voltage, charge current begins tapering down.

The bq24640 enters a low-current sleep mode
(<15 µA) when the input voltage falls below the output capacitor voltage.

The bq24640 has an input CE pin to enable and disable charge, and the STAT and PG output pins report charge and adapter status. The TS pin on the bq24640 monitors the temperature of the capacitor and suspends charge during hot and cold conditions.

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Technical documentation

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Type Title Date
* Data sheet bq24640 High-Efficiency Synchronous Switched-Mode Super Capacitor Charger datasheet (Rev. A) Jul. 31, 2015
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
Technical article Should I use a linear charger or a switching charger? Oct. 31, 2015
Technical article Supercapacitors-the solution for back-up power Jul. 17, 2015
Technical article Summertime and the livin' is easy Jun. 20, 2014
User guide Multi Cell Synchronous Switch-Mode Charger, EVM (HPA421) Feb. 18, 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

Evaluation Module for bq24600/bq24620/bq24640. the bq24600 is a highly integrated Li-ion or Li-polymer switch-mode battery charge controller. The bq24620 is highly integrated switch-mode battery charge controller designed specifically to charge Lithium Phosphate battery chemistries. The bq24640 is (...)

  • Evaluation Module for bq24600/bq24620/bq24640
  • High Efficiency Synchronous Buck Charger
  • User-programmable up to 26V Battery Voltage
  • AC Adapter Operating Range 5V to 28V
  • LED Indication for Control and Status Signals
  • Test Points for Key Signals Available for Testing Purpose. Easy Probe Hook-up.
  • Jumpers (...)

Design tools & simulation

SLUC175D.ZIP (782 KB)

Reference designs

28Vdc Input Super Cap Charger with Boost Converter for Bus Holdup Reference Design
PMP7327 This reference design uses the BQ24640 super cap charging controller to charge a large bank of super caps to a voltage below the input bus voltage. During an input bus dropout, the energy from the super caps is used to power a boost converter that can supply 10A of output current at 26.2V. This (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
VQFN (RVA) 16 View options

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