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BQ24172

更新时间： 2024-11-16 08:59:03
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德州仪器 - TI 电池开关
页数 文件大小 规格书
35页 2181K
描述
1.6-MHz Synchronous Switch-Mode Li-Ion and Li-Polymer Stand-Alone Battery Charger

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BQ24172 数据手册

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bq24170  
bq24172  
www.ti.com  
SLUSAD2A –NOVEMBER 2010–REVISED NOVEMBER 2010  
1.6-MHz Synchronous Switch-Mode Li-Ion and Li-Polymer Stand-Alone Battery Charger  
with Integrated MOSFETs and Power Path Selector  
Check for Samples: bq24170, bq24172  
1
FEATURES  
APPLICATIONS  
•
•
•
•
•
•
•
Tablet PC  
•
1.6MHz Synchronous Switch-Mode Charger  
with 4A Integrated N-MOSFETs  
Netbook and Ultra-Mobile Computers  
Portable Data Capture Terminals  
Portable Printers  
Medical Diagnostics Equipment  
Battery Bay Chargers  
•
•
•
Up to 94% Efficiency  
4.5V–17V Input Operating Range  
Battery Charge Voltage  
–
–
bq24170: 1, 2, or 3-Cell with 4.2V/Cell  
bq24172: Adjustable Charge Voltage  
Battery Back-Up Systems  
•
High Integration  
DESCRIPTION  
–
Automatic Power Path Selector Between  
Adapter and Battery  
The bq24170/172 is highly integrated stand-alone  
Li-ion and Li-polymer switch-mode battery charger  
with two integrated N-channel power MOSFETs. It  
–
–
–
–
–
Dynamic Power Management  
Integrated 20-V Switching MOSFETs  
Integrated Bootstrap Diode  
Internal Loop Compensation  
Internal Digital Soft Start  
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 to allow  
charge only in a preset temperature window. 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.  
•
Safety  
–
Thermal Regulation Loop Throttles Back  
Current to Limit Tj = 120°C  
–
–
Thermal Shutdown  
Battery Thermistor Sense Hot/Cold Charge  
Suspend & Battery Detect  
The bq24170/172 charges the battery in three  
phases: precondictioning, constant current, and  
constant voltage. The bq24170 charges one, two, or  
three cells (selected by CELL pin), and the bq24172  
is adjustable for up to three series Li+ cells.  
–
–
Input Over-Voltage Protection with  
Programmable Threshold  
Cycle-by-Cycle Current Limit  
Charge is terminated when the current reaches 10%  
of the fast charge rate. A programmable charge timer  
•
Accuracy  
–
–
–
±0.5% Charge Voltage Regulation  
offers  
a
safety back up. The bq24170/172  
±4% Charge Current Regulation  
±4% Input Current Regulation  
automatically restarts the charge cycle if the battery  
voltage falls below an internal threshold, and enters a  
low-quiescent current sleep mode when the input  
voltage falls below the battery voltage.  
•
•
•
Less than 15mA Battery Current with Adapter  
Removed  
The  
bq24170/172  
features  
Dynamic  
Power  
Less than 1.5mA Input Current with Adapter  
Present and Charge Disabled  
Management (DPM) to reduce the charge current  
when the input power limit is reached to avoid  
Small QFN Package  
over-loading the adapter.  
A
highly-accurate  
current-sense amplifier enables precise measurement  
of input current from adapter to monitor overall  
system power.  
–
3.5mm × 5.5mm QFN-24 Pin  
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.  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 2010, Texas Instruments Incorporated  
 
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