BQ25A Datasheet – Battery SMBus Charge Controller – TI

This is one of the Controller types.

Part Number : BQ24725A, Marking : BQ25A

Description : 1-4 Cell Li+ Battery SMBus Charge Controller

Package : 20-pin 3.5 × 3.5 mm2 VQFN Type

Manufactures : Texas Instruments

See the preview image and the PDF file for more information.


BQ25A Battery Charger Controller IC



The bq24725A ( Marking : BQ25A ) is a high-efficiency, synchronous battery charger, offering low component count for space-constraint, multi-chemistry battery charging applications.

The bq24725A utilizes 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 very high regulation accuracies that can be easily programmed by the system power management micro-controller.

The bq24725A uses internal input current register or external ILIM pin to throttle down PWM modulation to reduce the charge current.


BQ25A Pinout

BQ25A datasheet pinout

1. SMBus Host-Controlled NMOS-NMOS Synchronous Buck Converter with Programmable 615kHz, 750kHz, and 885kHz Switching Frequencies

2. Automatic N-channel MOSFET Selection of System Power Source from Adapter or Battery Driven by Internal Charge Pumps

3. Enhanced Safety Features for Over Voltage Protection, Over Current Protection, Battery, Inductor and MOSFET Short Circuit Protection


BQ25A Marking Information

BQ25A Packaging Information


Official Homepage :


BQ25A Datasheet


A1699 Datasheet PDF- PNP Transistor ( TO-92 )

This is a kind of PNP transistor.

Part Number : A1699

Function : PNP Epitaxial Planar Silicon Transistor

Package : TO-92 Type

Manufacturers : SANYO ( Panasonic )

Pinouts :
A1699 datasheet

Description :

1. High breakdown voltage.

2. Adoption of MBIT process.

3. Excellent hFE linearity.

Absolute maximum ratings ( Ta=25°C )

1. Collector to Base Voltage : Vcbo = – 400 V
2. Collector to Emitter Voltage : Vceo = – 400 V
3. Emitter to Base Voltage : Vebo = – 5V
4. Collector Current : Ic = – 200 mA
5. Total Dissipation : Pc = – 400 mA
6. Junction Temperature : Tj = 150°C
7. Storage Temperatue : Tsg = -55 ~ +150°C


Test Circuit


1. High-Voltage Driver

Other data sheets within the file : 2SA1699

A1699 Datasheet PDF Download

A1699 pdf