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BQ24707A
1-4 cell Li-ion battery charge controller with independent comparator and advanced circuit prot.
Data sheet
A newer version of this product is available
This product continues to be available for existing customers. New designs should consider an alternate product.
BQ24707A
- SMBus Host-Controlled NMOS-NMOS
Synchronous Buck Converter With Programmable
615 kHz, 750 kHz, and 885 kHz Switching
Frequency - Real-Time System Control on ILIM Pin to Limit
Charge Current - Enhanced Safety Features for Overvoltage
Protection, Overcurrent Protection, Battery,
Inductor, and MOSFET Short-Circuit Protection - Programmable Input Current, Charge Voltage,
Charge Current Limits- ±0.5% Charge Voltage Accuracy up to 19.2 V
- ±3% Charge Current Accuracy up to 8.128 A
- ±3% Input Current Accuracy up to 8.064 A
- ±2% 20× Adapter Current or Charge Current
Output Accuracy
- Programmable Adapter Detection and Indicator
- Independent Comparator With Internal Reference
- Integrated Soft-Start
- Integrated Loop Compensation
- AC Adapter Operating Range 5 V to 24 V
- 15-µA Off-State Battery Discharge Current
- 20-pin 3.5 mm × 3.5 mm QFN Package
- bq24707: ACOK Delay Default 1.3 s
- bq24707A: ACOK Delay Default 1.2 ms
- APPLICATIONS
- Portable Notebook Computers, UMPCs, Ultra-Thin
Notebooks, and Netbooks - Personal Digital Assistants
- Handheld Terminals
- Industrial and Medical Equipment
- Portable Equipment
- Portable Notebook Computers, UMPCs, Ultra-Thin
All other trademarks are the property of their respective owners
The bq24707 and bq24707A devices are high-efficiency, synchronous battery chargers, offering low component count for space-constrained, multi-chemistry battery charging applications.
SMBus controlled input current, charge current, and charge voltage DACs allow for very high regulation accuracies that can be easily programmed by the system power management micro-controller.
The IC uses the internal input current register or external ILIM pin to throttle down PWM modulation to reduce the charge current.
The IC provides an IFAULT output to alarm if any MOSFET fault or input over current occurs. This alarm output allows users to turn off input power selectors when the fault occurs. Meanwhile, an independent comparator with internal reference is available to monitor input current, output current, or output voltage.
The IC charges one-, two-, three-, or four-series Li+ cells, and is available in a 20-pin, 3.5 × 3.5 mm QFN package.
Technical documentation
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View all 3 | Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | bq24707x 1-4 Cell Li+ Battery SMBus Charge Controller With Independent Comparator and Advanced Circuit Protection datasheet (Rev. C) | PDF | HTML | 31 Jul 2015 |
| Application note | Autonomous Smart Battery Guide | PDF | HTML | 15 Oct 2021 | |
| Application note | How to Review a Multicell Switching Charger Schematic | 21 Sep 2011 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| VQFN (RGR) | 20 | Ultra Librarian |
Ordering & quality
Information included:
- RoHS
- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
Information included:
- Fab location
- Assembly location
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