Part Number: BQ738 ( = BQ24738 )
Function : 1-4 Cell Li+ Battery SMBus Charge Controller
Package: QFN-20 Type
Manufacturer: Texas Instruments
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Description
The BQ738 device is a high-efficiency, synchronous battery charger, offering low component count for space-constrained, multichemistry battery charging applications. The BQ738 device supports turbo boost by allowing battery discharge energy to the system when system power demand is temporarily higher than the adapter maximum power level so the adapter will not crash.
Pinout
Features
1. Adapter and Battery Provide Power to System Together to Support Intel CPU Turbo Boost Mode
2. SMBus Host-Controlled NMOS-NMOS Synchronous Buck Converter With Programmable 615-, 750-, and 885-kHz Switching Frequencies
3. Programmable Battery Depletion Threshold, and Battery LEARN Function
4. Programmable Adapter Detection and Indicator
5. Integrated Loop Compensation and Soft Start
Applications
1. Portable Notebook Computers, UMPC, Ultra-Thin Notebooks, and Netbooks
2. Handheld Terminals
3. Portable Equipment
4. Industrial and Medical Equipment
Design Considerations
- Select external MOSFETs with appropriate RDS(on) and current rating for charger efficiency.
- Inductor value must be chosen based on switching frequency and desired ripple current.
- Proper layout of high-current switching paths is critical to minimize EMI and losses.
- Use SMBus interface to configure charging voltage, current limits, and system power management.
- Thermal management of MOSFETs and inductor should be considered in compact notebook designs.
Selection Guidance
- Recommended when SMBus-controlled smart charging is required.
- Suitable for systems needing adapter and battery power sharing.
- Useful in designs where high transient CPU loads must be supported.
- Appropriate for compact designs requiring low external component count.
- Compatible with multichemistry rechargeable battery systems.
Other data sheets are available within the file: BQ24738
BQ738 Datasheet
BQ735 Datasheet
