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BQ24901

更新时间： 2024-11-29 04:34:39
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德州仪器 - TI /
页数 文件大小 规格书
18页 267K
描述
SINGLE-CELL LI-ION AND LI-POL CHARGE MANAGEMENT IC FOR OFFLINE APPLICATIONS

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中文翻译

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BQ24901 数据手册

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SLUS527 – DECEMBER 2002  
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ꢗꢏ ꢔ ꢏ ꢗ ꢗꢋ ꢈꢉ ꢌ ꢐꢒ ꢒꢋ ꢈꢎꢐꢖ ꢈꢏ ꢉꢇ  
FEATURES  
DESCRIPTION  
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Designed for Off-Line Charger Design for  
Single-Cell Li-Ion Packs  
The bq24901 Li-Ion charge management devices  
are designed specifically for off-line charger  
applications. The bq24901 resides on the  
secondary-side of the transformer and provides  
the control feedback to a variety of primary side  
controllers. The bq24901 offers current or voltage  
regulation feedback, temperature monitoring,  
charge status, and adjustable charge termination,  
Provides Control Feedback to a Primary-Side  
Controller  
Robust Battery Insertion and Removal  
Detection  
Charge Current and Voltage Regulation  
Feedback to Primary-Side for High-Accuracy  
Charging  
in  
a
single monolithic device. During  
battery-absent or charge-complete conditions,  
the bq24901 continuously regulates the  
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Charge Termination by Minimum Current and  
Time  
secondary-side voltage, used as V  
the device.  
supply to  
CC  
Pre-Charge Conditioning Regulator with  
Safety Timer  
The bq24901 features a time-limited precon–  
ditioning phase to condition deeply discharged  
cells. The pre-conditioning phase is achieved by  
linear regulation in the secondary side. Following  
preconditioning, the bq24901 regulates the  
charge current to the value set by the external  
current sense resistor. Once the battery reaches  
the charge voltage, the voltage regulation loop  
takes over and completes the charge cycle. The  
accuracy of the voltage regulation is better than  
±30mV. Charge is terminated based on minimum  
current. The minimum current level is set through  
TADJ pin. An internal five-hour charge timer  
provides a backup for charge termination.  
Charge Status Outputs for LED or Host  
Processor Interface Indicates Charge-  
in-Progress, Charge Completion, and Fault  
Conditions  
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Temperature Monitoring Before and During  
Charge  
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Short-Circuit Protection  
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Small, 14-Pin TSSOP Package  
APPLICATIONS  
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Cradle Chargers for Digital Cameras  
Desktop Chargers  
Handheld Devices  
The bq24901 is designed to reliably detect battery  
insertion and removal conditions, including packs  
with open protectors. Other standard features  
include a recharge feature activated when the  
battery voltage falls below the V  
threshold.  
RCH  
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Copyright 2002, Texas Instruments Incorporated  
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