BQ24725系列介绍资料

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BQ24725

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具有 N 沟道功率 MOSFET 选择器的 SMBus 2 至 4 节降压电池充电控制器

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The bq24725 is a high-efficiency, synchronous battery charger, offering low component count for space-constraint, multi-chemistry battery charging applications.

The bq24725 uses two charge pumps to separately drive n-channel MOSFETs (ACFET, RBFET and BATFET) for automatic system power source selection.

SMBus controlled input current, charge current, and charge voltage DACs allow for high regulation accuracies that can be programmed by the system power management micro-controller.

The bq24725 uses internal input current register or external ILIM pin to throttle down PWM modulation to reduce the charge current.

The bq24725 charges two, three or four series Li+ cells, and is available in a 20-pin, 3.5 × 3.5 mm² QFN package.

SMBus Host-Controlled NMOS-NMOS Synchronous Buck Converter with
Programmable 615kHz, 750kHz, and 885kHz Switching Frequencies
Automatic N-channel MOSFET Selection of System Power Source from
Adapter or Battery Driven by Internal Charge Pumps
Enhanced Safety Features for Over Voltage Protection, Over Current
Protection, Battery, Inductor and MOSFET Short Circuit Protection
Programmable Input Current, Charge Voltage, Charge Current Limits
- ±0.5% Charge Voltage Accuracy up to 19.2V
- ±3% Charge Current Accuracy up to 8.128A
- ±3% Input Current Accuracy up to 8.064A
- ±2% 20x Adapter Current or Charge Current Amplifier
  Output Accuracy
Programmable Battery Depletion Threshold, and Battery LERAN Function
Programmable Adapter Detection and Indicator
Integrated Soft Start
Integrated Loop Compensation
Real Time System Control on ILIM pin to Limit Charge Current
AC Adapter Operating Range 9V-24V
5µA Off-State Battery Discharge Current
20-pin 3.5 × 3.5 mm² QFN Package
APPLICATIONS
- Portable Notebook Computers, UMPC, Ultra-Thin Notebook, and Netbook
- Personal Digital Assistant
- Handheld Terminal
- Industrial and Medical Equipment
- Portable Equipment

PowerPAD is a trademark of Texas Instruments.

Number of series cells	2, 3, 4
Charge current (max) (A)	8
Vin (max) (V)	24
Cell chemistry	Li-Ion/Li-Polymer
Battery charge voltage (min) (V)	1.024
Battery charge voltage (max) (V)	19.2
Absolute max Vin (max) (V)	30
Control topology	Switch-Mode Buck
Control interface	SMBus
Features	Input OVP, Power Path
Vin (min) (V)	0
Rating	Catalog
Operating temperature range (°C)	-40 to 85

VQFN (RGR)

12.25 mm² 3.5 x 3.5

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BQ24725

具有 N 沟道功率 MOSFET 选择器的 SMBus 2 至 4 节降压电池充电控制器

4000-306-326