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FEATURES

APPLICATIONS

DESCRIPTION

ACOP

bq24750

28LDQFN

TOP VIEW

DPMDET

SRN

BAT

CELLS

SRP

SRSET

IADAPT

ACDRV

ACSET

CHGEN

ACN

ACP

ACDET

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21

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bq24750

SLUS735 – DECEMBER 2006

Host-controlled Multi-chemistry Battery Charger with Integrated System Power Selector

and AC Over-Power Protection

• Charge Enable

• NMOS-NMOS Synchronous Buck Converter

• 10-µA Off-State Current

with 300 kHz Frequency and >95% Efficiency

• 28-pin, 5x5-mm QFN package

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

Maximum Effective Duty Cycle

• Notebook and Ultra-Mobile Computers

• High-Accuracy Voltage and Current

Regulation

• Portable Data-Capture Terminals

• 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

–

Internal Soft Start

count for space-constrained multi-chemistry battery

charging applications. Ratiometric charge current

• Safety

and voltage programming allows very high regulation

–

Input Overvoltage Protection (OVP)

accuracies,

and

can

be

either

hardwired

with

–

Dynamic Power Management (DPM) with

resistors

or

programmed

by

the

system

Status Indicator

power-management microcontroller using a DAC or

GPIOs.

–

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.

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, 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.