DCINP

PGND

CSSN

CSSP

VREF

PHASE

PHASE

PHASE

BOOT

DCINA

bq24765

34 LD

QFN

TOP VIEW

DCINP

DCINP

VDDP

ICOUT

1

34

7

29

23

2

3

4

5

6

28

27

26

25

24

33

32

31

ICREF

ACIN

CSOP

CSON

9

21

8

22

EAO

EAI

FBO

VFB

AGND

ACOK

10

11

12

20

19

18

30

13

14

15

16

17

bq24765

www.ti.com

SLUS999 – NOVEMBER 2009

SMBus-Controlled Multi-Chemistry Battery Charger With Integrated Power MOSFETs

Check for Samples :bq24765

1

FEATURES

–

< 10-

μA Battery Current with Adapter

Removed

•

Integrated Power MOSFETs, NMOS-NMOS,

Synchronous Buck Converter

–

< 1 mA Input DCINA Current When Adapter

Present and Charge Disabled

•

>95% Efficiency

•

34-pin, 3.5mmx7mm QFN Package

•

Frequency 700kHz Allows Smaller Inductor

(5mm x 5mm)

APPLICATIONS

•

•

Notebook and Ultra-Mobile Computers

120°C

•

Portable Data-Capture Terminals

•

Adaptive Driver Dead-time and 99.5%

•

Portable Printers

Maximum Effective Duty Cycle

•

Medical Diagnostics Equipment

•

High-Accuracy Voltage and Current Regulation

•

Battery Bay Chargers

–

±0.5% Charge Voltage Accuracy

•

Battery Back-up Systems

–

±3% Charge Current Accuracy

–

±3% Adapter Current Accuracy

DESCRIPTION

–

±2% Input Current Sense Amp Accuracy

The

bq24765

is

a

high-efficiency,

synchronous

•

Integration

battery charger with two integrated 30m

Ω NMOS

power MOSFETs, and an integrated input current

–

Integrated Power MOSFETs

comparator,

offering

low

component

count

for

–

Input Current Comparator

space-constraint, multi-chemistry battery charging

–

Internal Soft-Start

applications.

Input

current,

charge

current,

and

•

Safety

charge voltage DACs allow for very high regulation

accuracies that can be easily programmed by the

–

Thermal Regulation Loop and Thermal

system power management micro-controller using

Shutdown

SMBus. The bq24765 has switching frequency of

–

Dynamic Power Management (DPM)

700kHz. The bq24765 charges 2, 3, or 4 series Li+

–

Power FETs Over Current Protection

cells, and is available in a 34-pin, 3.5mmx7mm QFN

package.

•

7 V–24 V AC/DC-Adapter Operating Range

•

Simplified SMBus Control

–

Charge Voltage DAC (1.024 V–19.2 V)

–

Charge Current DAC (128 mA–8.064 A)

–

Adapter Current Limit DPM DAC (256

mA–11.008 A)

•

Status and Monitoring Outputs

–

AC/DC Adapter Present with Adjustable

Voltage Threshold

–

Input Current Comparator, With Adjustable

Threshold and Hysteresis

–

Current Sense Amplifier for Current Drawn

From Input Source

•

Charge Any Battery Chemistry: Li+, LiFePO4,

NiCd, NiMH, Lead Acid (2, 3, and 4 Li-Ion Cells)

•

Charge Enable Pin (CE)

•

Energy Star Low Iq

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Copyright © 2009, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.