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QB2057C

更新时间： 2024-09-23 12:14:03
品牌 Logo 应用领域
德州仪器 - TI /
页数 文件大小 规格书
30页 1041K
描述
ADVANCED LINEAR CHARGE MANAGEMENT IC FOR SINGLE-AND TWO-CELL LITHIUM-ION AND LITHIUM-POLYMER

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中文翻译

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QB2057C 数据手册

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ꢀ ꢁꢂ ꢃ ꢄ ꢅ ꢆ ꢀꢁ ꢂꢃ ꢄꢅ ꢇ  
ꢀ ꢁꢂ ꢃ ꢄ ꢅ ꢈꢆ ꢀꢁ ꢂꢃ ꢄꢅ ꢉ  
SLUS025F − MAY 2001 − REVISED JULY 2002  
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FEATURES  
DESCRIPTION  
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Ideal for Single (4.1 V or 4.2 V) and Dual-Cell  
(8.2 V or 8.4 V) Li-Ion or Li-Pol Packs  
The BENCHMARQ bq2057 series advanced  
Lithium-Ion (Li-Ion) and Lithium-Polymer (Li-Pol) linear  
charge-management ICs are designed for cost-  
sensitive and compact portable electronics. They  
combine high-accuracy current and voltage regulation,  
battery conditioning, temperature monitoring, charge  
termination, charge-status indication, and AutoComp  
charge-rate compensation in a single 8-pin IC. MSOP,  
TSSOP, and SOIC package options are offered to fit a  
wide range of end applications.  
Requires Small Number of External  
Components  
0.3 V Dropout Voltage for Minimizing Heat  
Dissipation  
Better Than 1% Voltage Regulation Accuracy  
With Preset Voltages  
AutoCompt Dynamic Compensation of  
Battery Pack’s Internal Impedance to Reduce  
Charge Time  
The bq2057 continuously measures battery  
temperature using an external thermistor. For safety,  
the bq2057 inhibits charge until the battery temperature  
is within user-defined thresholds. The bq2057 then  
charges the battery in three phases: conditioning,  
constant current, and constant voltage. If the battery  
D
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Optional Cell-Temperature Monitoring Before  
and During Charge  
Integrated Voltage and Current Regulation  
With Programmable Charge-Current and High-  
or Low-Side Current Sensing  
voltage is below the low-voltage threshold, V  
, the  
(min)  
D
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Integrated Cell Conditioning for Reviving  
Deeply Discharged Cells and Minimizing Heat  
Dissipation During Initial Stage Of Charge  
bq2057 precharges using a low current to condition the  
battery. The conditioning charge rate is approximately  
10% of the regulation current. The conditioning current  
also minimizes heat dissipation in the external pass-  
element during the initial stage of the charge. After  
conditioning, the bq2057 applies a constant current to  
the battery. An external sense-resistor sets the current.  
The sense-resistor can be on either the high or low side  
of the battery without additional components. The  
constant-current phase continues until the battery  
reaches the charge-regulation voltage.  
Charge Status Output for Single or Dual Led  
or Host Processor Interface  
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Automatic Battery-Recharge Feature  
Charge Termination by Minimum Current  
Automatic Low-Power Sleep Mode When V  
CC  
Is Removed  
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EVMs Available for Quick Evaluation  
D
Packaging: 8-Pin SOIC, 8-Pin TSSOP, 8-Pin  
MSOP  
bq2057xSN or bq2057xTS  
SOIC (SN) or TSSOP (TS) PACKAGE  
(TOP VIEW)  
bq2057xDGK  
MSOP (DGK) PACKAGE  
(TOP VIEW)  
COMP  
CC  
BAT  
SNS  
BAT  
VCC  
TS  
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VCC  
TS  
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5
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4
SNS  
COMP  
CC  
VSS  
STAT  
VSS  
STAT  
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.  
AutoComp is a trademark of Texas Instruments.  
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Copyright 2002, Texas Instruments Incorporated  
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ꢣ ꢧ ꢤ ꢣꢜ ꢝꢰ ꢟꢞ ꢢ ꢩꢩ ꢨꢢ ꢠ ꢢ ꢡ ꢧ ꢣ ꢧ ꢠ ꢤ ꢫ  
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