BQ24171

更新时间： 2024-09-15 12:50:35

品牌	Logo	应用领域
德州仪器 - TI		电池开关
页数	文件大小	规格书
35页	2326K
描述
JEITA Compliant Stand-Alone Switch-Mode Li-Ion and Li-Polymer Battery Charger with Integrated MOSFETs and Power Path Selector

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BQ24171 数据手册

bq24171

www.ti.com

SLUSAF2A –FEBRUARY 2011–REVISED MAY 2011

JEITA Compliant Stand-Alone Switch-Mode Li-Ion and Li-Polymer

Battery Charger with Integrated MOSFETs and Power Path Selector

Check for Samples: bq24171

FEATURES

APPLICATIONS

•

JEITA Compatible Battery Temperature

Sensing

•

Tablet PC

Netbook and Ultra-Mobile Computers

Portable Data Capture Terminals

Portable Printers

•

1.6MHz Synchronous Switch-Mode Charger

with 4A Integrated N-MOSFETs

•

Up to 94% Efficiency

Medical Diagnostics Equipment

Battery Bay Chargers

30V Input Rating with Adjustable Over-Voltage

Protection

Battery Back-Up Systems

–

4.5V to 17V Input Operating Voltage

Battery Charge Voltage

1, 2, or 3-Cell with 4.2V/Cell

High Integration

•

DESCRIPTION

–

The bq24171 is highly integrated stand-alone Li-ion

and Li-polymer switch-mode battery charger with two

integrated N-channel power MOSFETs. It offers a

constant-frequency synchronous PWM controller with

high accuracy regulation of input current, charge

current, and voltage. It closely monitors the battery

pack temperature and allows charge only in a JEITA

profile compatible window with lower charge rate at

low temperature and lower charge voltage at high

temperature. It also provides battery detection,

pre-conditioning, charge termination, and charge

status monitoring. The thermal regulation loop

reduces charge current to maintain the junction

temperature of 120°C during operation.

–

Automatic Power Path Selector Between

Adapter and Battery

–

Dynamic Power Management

Integrated 20-V Switching MOSFETs

Integrated Bootstrap Diode

Internal Loop Compensation

Internal Digital Soft Start

•

Safety

–

Thermal Regulation Loop Throttles Back

Current to Limit T_j= 120°C

The bq24171 charges the battery in three phases:

preconditioning, constant current, and constant

voltage. It is adjustable for up to three series Li+

cells.

–

Thermal Shutdown

Battery Thermistor Sense Hot/Cold Charge

Suspend & Battery Detect

–

Input Over-Voltage Protection with

Programmable Threshold

Charge is terminated when the current reaches 10%

of the fast charge rate. A programmable charge timer

offers a safety back up. The bq24171 automatically

restarts the charge cycle if the battery voltage falls

Cycle-by-Cycle Current Limit

•

Accuracy

below an internal threshold, and enters

–

±0.5% Charge Voltage Regulation

low-quiescent current sleep mode when the input

voltage falls below the battery voltage.

±4% Charge Current Regulation

±4% Input Current Regulation

The bq24171 features Dynamic Power Management

(DPM) to reduce the charge current when the input

power limit is reached to avoid over-loading the

adapter. A highly-accurate current-sense amplifier

enables precise measurement of input current from

adapter to monitor overall system power.

•

Less than 15μA Battery Current with Adapter

Removed

Less than 1.5mA Input Current with Adapter

Present and Charge Disabled

Small QFN Package

–

3.5mm × 5.5mm QFN-24 Pin

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.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

12 3 4 5 6 7...35

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与BQ24171相关器件

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bq24171RGYR	TI	获取价格	JEITA Compliant Stand-Alone Switch-Mode Li-Ion and Li-Polymer Battery Charger with Integra
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BQ24172	TI	获取价格	1.6-MHz Synchronous Switch-Mode Li-Ion and Li-Polymer Stand-Alone Battery Charger
BQ24172RGYR	TI	获取价格	1.6-MHz Synchronous Switch-Mode Li-Ion and Li-Polymer Stand-Alone Battery Charger
BQ24172RGYT	TI	获取价格	1.6-MHz Synchronous Switch-Mode Li-Ion and Li-Polymer Stand-Alone Battery Charger
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