1

FEATURES

APPLICATIONS

DESCRIPTION

ACOP

bq24750

28LDQFN

TOP VIEW

DPMDET

SRN

BAT

CELLS

SRP

SRSET

IADAPT

ACDRV

ACSET

CHGEN

ACN

ACP

ACDET

1

2

3

4

5

6

7

21

20

19

18

17

16

15

8

9

10

11 12 13

14

28

27 26

25

24 23

22

bq24750

Host-Controlled Multi-Chemistry Battery Charger With Integrated System Power Selector

and AC Overpower Protection

• 10-µA Off-State Current

• NMOS-NMOS Synchronous Buck Converter

• 28-pin, 5x5-mm QFN package

with 300 kHz Frequency and >95% Efficiency

• 30-ns Minimum Driver Dead-time and 99.5%

• Notebook and Ultra-Mobile Computers

Maximum Effective Duty Cycle

• Portable Data-Capture Terminals

• High-Accuracy Voltage and Current Regulation

• Portable Printers

–

±0.5% Charge Voltage Accuracy

• Medical Diagnostics Equipment

–

±3% Charge Current Accuracy

• Battery Bay Chargers

–

±3% Adapter Current Accuracy

• Battery Back-up Systems

–

±2% Input Current Sense Amp Accuracy

• Integration

–

Automatic System Power Selection From

The

bq24750

is

a

high-efficiency,

synchronous

AC/DC Adapter or Battery

battery charger with integrated compensation and

–

Internal Loop Compensation

system power selector logic, offering low component

count for space-constrained multi-chemistry battery

–

Internal Soft Start

charging applications. Ratiometric charge current and

• Safety

voltage

programming

allows

high

regulation

–

Input Overvoltage Protection (OVP)

accuracies, and can be either hardwired with resistors

or programmed by the system power-management

–

Dynamic Power Management (DPM) with

microcontroller using a DAC or GPIOs.

Status Indicator

–

Programmable Inrush Adapter Power

(ACOP) and Overcurrent (ACOC) Limits

–

Reverse-Conduction Protection Input FET

–

Battery Thermistor Sense Input (TS) for

Charge Qualification

• Supports Two, Three, or Four Li+ Cells

• 5–24 V AC/DC-Adapter Operating Range

• Analog Inputs with Ratiometric Programming

via Resistors or DAC/GPIO Host Control

–

Charge Voltage (4–4.512 V/cell)

–

Charge Current (up to 10 A, with 10-m

Ω

Sense Resistor)

–

Adapter Current Limit (DPM)

• Status and Monitoring Outputs

–

AC/DC Adapter Present with Programmable

Voltage Threshold

–

DPM Loop Active

–

Current Drawn from Input Source

• Supports Any Battery Chemistry: Li+, NiCd,

NiMH, Lead Acid, etc.

• Charge Enable

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 © 2006–2009, 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.