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MIC79050

更新时间： 2024-11-20 22:05:07
品牌 Logo 应用领域
麦瑞 - MICREL 电池
页数 文件大小 规格书
20页 104K
描述
Simple Lithium-Ion Battery Charger Preliminary Information

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MIC79050 数据手册

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MIC79050  
Simple Lithium-Ion Battery Charger  
Preliminary Information  
General Description  
Features  
The MIC79050 is a simple single-cell lithium-ion battery  
charger. It includes an on-chip pass transistor for high preci-  
sioncharging.Featuringultrahighprecision(+0.75%overthe  
Li-ion battery charging temperature range) and “zero” off  
mode current, the MIC79050 provides a very simple, cost  
effective solution for charging lithium-ion battery.  
• High accuracy charge voltage:  
±0.75% over -5°C to + 60°C (Li-ion charging  
temperature range)  
• “Zero” off-mode current  
• 10µA reverse leakage  
• Ultralow 380mV dropout at 500mA  
• Wide input voltage range  
• Logic controlled enable input (8-pin devices only)  
• Thermal shutdown and current limit protection  
• Power MSOP-8, Power SOP-8, and SOT-223  
• Pulse charging capability  
Other features of the MIC79050 include current limit and  
thermal shutdown protection. In the event the input voltage to  
the charger is disconnected, the MIC79050 also provides  
minimal reverse-current and reversed-battery protection.  
The MIC79050 is a fixed 4.2V device and comes in the  
thermally-enhanced MSO-8, SO-8, and SOT-223 packages.  
The 8-pin versions also come equipped with enable and  
feedback inputs. All versions are specified over the tempera-  
ture range of –40°C to +125°C.  
Applications  
• Li-ion battery charger  
• Celluar phones  
• Palmtop computers  
• PDAs  
• Self charging battery packs  
Ordering Information  
Part Number  
Voltage  
4.2V  
Junct. Temp. Range  
–40°C to +125°C  
–40°C to +125°C  
–40°C to +125°C  
Package  
SOT-223  
SOP-8  
MIC79050-4.2BS  
MIC79050-4.2BM  
MIC79050-4.2BMM  
4.2V  
4.2V  
MSOP-8  
Typical Applications  
MIC79050-4.2BS  
4.2V ±0.75% Over Temp  
Regulated or  
unregulated  
wall adapter  
IN  
BAT  
Li-Ion  
Cell  
GND  
Simplest Battery Charging Solution  
Regulated or  
unregulated  
wall adapter  
MIC79050-4.2BMM  
4.2V ±0.75%  
IN  
BAT  
FB  
Li-Ion  
Cell  
EN  
External PWM*  
GND  
*See Applications Information  
Pulse-Charging Application  
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com  
June 2000  
1
MIC79050  
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