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BQ24901_13

BQ24901_13首页预览图
型号: BQ24901_13
PDF文件:
  • BQ24901_13 PDF文件
  • BQ24901_13 PDF在线浏览
功能描述: OFFLNE APPLICATIONS
PDF文件大小: 283.83 Kbytes
PDF页数: 共18页
制造商: TI1[Texas Instruments]
制造商LOGO: TI1[Texas Instruments] LOGO
制造商网址: http://www.ti.com
捡单宝BQ24901_13
PDF页面索引
120%

SLUS527 – DECEMBER 2002
      
  
1
www.ti.com
FEATURES
D
Designed for Off-Line Charger Design for
Single-Cell Li-Ion Packs
D Provides Control Feedback to a Primary-Side
Controller
D Robust Battery Insertion and Removal
Detection
D Charge Current and Voltage Regulation
Feedback to Primary-Side for High-Accuracy
Charging
D Charge Termination by Minimum Current and
Time
D Pre-Charge Conditioning Regulator with
Safety Timer
D Charge Status Outputs for LED or Host
Processor Interface Indicates Charge-
in-Progress, Charge Completion, and Fault
Conditions
D Temperature Monitoring Before and During
Charge
D Short-Circuit Protection
D Small, 14-Pin TSSOP Package
APPLICATIONS
D
Cradle Chargers for Digital Cameras
D Desktop Chargers
D Handheld Devices
DESCRIPTION
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 of fers current or voltage
regulation feedback, temperature monitoring,
charge status, and adjustable charge termination,
in a single monolithic device. During
battery-absent or charge-complete conditions,
the bq24901 continuously regulates the
secondary-side voltage, used as V
CC
supply to
the device.
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.
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
RCH
threshold.
        
         
       
   
Copyright 2002, Texas Instruments Incorporated
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