BQ24640
- Charge Super Capacitor Pack From 2.1 V to 26 V
- CC/CV Charge Profile From 0 V Without
Precharge - 600-kHz NMOS-NMOS Synchronous Buck
Controller - Over 90% Efficiency for up to 10-A Charge
Current - 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
Consumption- <15-µA Off-State Super Capacitor Discharge
Current - <1.5-mA Off-State Input Quiescent Current
- <15-µA Off-State Super Capacitor Discharge
- APPLICATIONS
- 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
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.
Technical documentation
Type | Title | Date | ||
---|---|---|---|---|
* | Data sheet | bq24640 High-Efficiency Synchronous Switched-Mode Super Capacitor Charger datasheet (Rev. A) | PDF | HTML | 31 Jul 2015 |
Application note | How to Quickly and Safely Charge Supercapacitors | PDF | HTML | 27 Mar 2023 | |
Application note | BQ241xx/BQ246xx Selection of Multi-Cell Standalone Switching Battery Chargers | 31 Dec 2019 | ||
User guide | Multi Cell Synchronous Switch-Mode Charger, EVM (HPA421) | 18 Feb 2010 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
BQ24640EVM — Evaluation Module for BQ24640 Multi Cell Synchronous Switch-Mode Charger
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 (...)
PMP7327 — 28Vdc Input Super Cap Charger with Boost Converter for Bus Holdup Reference Design
Package | Pins | CAD symbols, footprints & 3D models |
---|---|---|
VQFN (RVA) | 16 | Ultra Librarian |
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