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LT1571-1

更新时间： 2022-11-27 03:30:53
品牌 Logo 应用领域
凌特 - Linear 电池
页数 文件大小 规格书
16页 205K
描述
Constant-Current/ Constant-Voltage Battery Charger with Preset Voltage and Termination Flag

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LT1571-1 数据手册

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Final Electrical Specifications  
LT1571 Series  
Constant-Current/  
Constant-Voltage Battery Charger  
with Preset Voltage and Termination Flag  
April 2000  
U
FEATURES  
DESCRIPTIO  
The LT®1571 PWM battery charger is a simple, efficient  
solution to fast-charge rechargeable batteries including  
lithium-ion (Li-Ion), nickel-metal-hydride (NiMH) and  
nickel-cadmium (NiCd) using constant-current and/or  
constant-voltage control. The internal switch is capable  
of delivering 1.5A DC current (2A peak current). The  
onboard current sense resistor (0.1Ω) allows simple  
charge current programming to within 5% accuracy  
using a low cost external resistor. The constant-voltage  
outputcanbeselectedfor4.1Vor4.2Vpercellwith0.6%  
accuracy.  
■
Fast Charging of Li-Ion, NiMH and NiCd Batteries  
Simple Charge Current Programming Requires Only  
One Low Cost, 1/32W Resistor  
High Efficiency Charger with Up to  
1.5A Charge Current  
Precision 0.6% Internal Voltage Reference  
Preset Battery Voltages: 4.1V, 4.2V, 8.2V, 8.4V  
500kHz or 200kHz Switching Frequency  
Minimizes Charger Size  
■
■
■
■
■
■
■
■
■
■
Low Reverse Battery Drain Current: 5µA  
Flag Indicates Li-Ion Charge Completion  
5% Typical Charge Current Accuracy  
Low Shutdown Current  
LT1571-5: 500kHz, Fixed 4.1V or 4.2V  
LT1571-1: 200kHz, Adjustable Voltage  
LT1571-2: 200kHz, Fixed 8.2V or 8.4V  
U
LT1571 can charge batteries ranging from 1V to 20V. A  
saturating switch operating at 200kHz (LT1571-1,  
LT1571-2) or 500kHz (LT1571-5) gives high efficiency  
and small charger size. A logic output (flag) indicates  
Li-Ion near full charge when the charge current drops to  
20% of the programmed value. The LT1571-1 and  
LT1571-2 are in a 28-pin fused lead narrow SSOP power  
package. The LT1571-5 is in a 16-pin fused lead narrow  
SSOP power package.  
APPLICATIO S  
■
Cellular Phones, PDAs, Notebook Computers,  
Portable Instruments  
■
Cradle Chargers for Li-Ion, NiCd, NiMH and  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Lead-Acid Rechargeable Batteries  
U
TYPICAL APPLICATIO  
D3  
D1  
MBRM120T3  
V
MBRM120T3  
IN  
8.2V  
V
CC  
SW  
TO 20V  
C
*
IN  
C1  
0.22µF  
LT1571-5  
10µF  
L1**  
10µH  
V
PROG  
BOOST  
DD  
D2  
1µF  
0.33µF  
MMBD914L  
100k 6.19k  
300Ω  
SENSE  
CAP  
V
C
1k  
CHARGE  
COMPLETE  
FLAG  
BAT  
0.1µF  
SELECT  
GND  
4.2V  
+
+
C
OUT  
22µF  
***  
BAT2  
Li-Ion  
BATTERY  
*TOKIN OR MARCON CERAMIC SURFACE MOUNT  
**COILTRONICS TP3-100, 10µH, 2.2mm HEIGHT (0.8A CHARGING CURRENT)  
COILTRONICS TP1 SERIES, 10µH, 1.8mm HEIGHT (<0.5A CHARGING CURRENT)  
***  
1571 F01  
PANASONIC EEFCD1B220  
Figure 1. Compact Li-Ion Cellular Phone Charger (0.8A)  
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.  
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-  
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.  
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