24

23

22

21

20

19

7

8

9

10

11

12

18

17

16

15

14

13

1

2

3

4

5

6

CE

ACN

ACP

ACDRV

STAT1

TS

SRN

SRP

ISET 2

ACSET

GND

REGN

OAT

(bq24630)

QFN-24

bq24630

www.ti.com

SLUS894 – JANUARY 2010

Stand-Alone Synchronous Switch-Mode Lithium Phosphate Battery Charger with System

Check for Samples: bq24630

1

FEATURES

•

•

300 kHz NMOS-NMOS Synchronous Buck

•

Converter

–

< 15 mA Off-State Battery Discharge current

•

Stand-alone Charger Specifically for Lithium

–

< 1.5 mA Off-State Input Quiescent Current

Phosphate

•

5V–28V VCC Input Operating Range, Support

APPLICATIONS

1-7 Battery Cells

•

Power Tool and Portable Equipment

•

High-Accuracy Voltage and Current Regulation

•

Personal Digital Assistants

•

Handheld Terminals

–

±0.5% Charge Voltage Accuracy

•

Industrial and Medical Equipment

–

±3% Charge Current Accuracy

•

Netbook, Mobile Internet Device and

–

±3% Adapter Current Accuracy

Ultra-Mobile PC

•

Integration

–

Automatic System Power Selection from

DESCRIPTION

Adapter or Battery

The bq24630 is highly integrated switch-mode battery

–

Internal Loop Compensation

charge controller designed specifically for Lithium

–

Internal Soft Start

Phosphate battery. It offers a constant-frequency

synchronous PWM controller with high accuracy

–

Dynamic Power Management (DPM)

current

and

voltage

regulation,

charge

•

Safety Protection

preconditioning,

termination,

adapter

current

–

Input Over-Voltage Protection

regulation, and charge status monitoring.

–

Battery Thermistor Sense Suspend Charge

The bq24630 charges the battery in three phases:

preconditioning,

constant

current,

and

constant

Hot/Cold or Warm/Cool

voltage. Charge is terminated when the current

reaches

a

minimum

user-selectable

level.

A

–

Battery Detection

programmable

charge

timer

provides

a

safety

–

Reverse Protection Input FET

backup. The bq24630 automatically restarts the

–

Programmable Safety Timer

charge cycle if the battery voltage falls below an

–

Charge Over-Current Protection

internal threshold, and enters a low-quiescent current

sleep mode when the input voltage falls below the

–

Battery Short Protection

battery voltage.

–

Battery Over-Voltage Protection

PACKAGE AND PINOUT

–

Thermal Shutdown

•

Status Outputs

–

Adapter Present

–

Charger Operation Status

•

Charge Enable Pin

•

6V Gate Drive for Synchronous Buck

Converter

•

30ns Driver Dead-time and 99.95% Max

Effective Duty Cycle

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 © 2010, 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.