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SC121EVB

更新时间： 2024-11-19 09:33:55
品牌 Logo 应用领域
商升特 - SEMTECH 稳压器
页数 文件大小 规格书
23页 330K
描述
Low Voltage Synchronous Boost Regulator

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中文翻译

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SC121EVB 数据手册

 浏览型号SC121EVB的Datasheet PDF文件第2页浏览型号SC121EVB的Datasheet PDF文件第3页浏览型号SC121EVB的Datasheet PDF文件第4页浏览型号SC121EVB的Datasheet PDF文件第5页浏览型号SC121EVB的Datasheet PDF文件第6页浏览型号SC121EVB的Datasheet PDF文件第7页 
SC121  
Low Voltage Synchronous  
Boost Regulator  
POWER MANAGEMENT  
Features  
Description  
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Input voltage — 0.7V to 4.5V  
The SC121 is a high efficiency, low noise, synchronous  
step-up DC-DC converter that provides boosted voltage  
levels in low-voltage handheld applications. The wide  
input voltage range allows use in systems with single  
NiMH or alkaline battery cells as well as in systems with  
higher voltage battery supplies. It features an internal  
1.2A switch and synchronous rectifier to achieve up to  
94% efficiency and to eliminate the need for an external  
Schottky diode. The output voltage can be set to 3.3V  
with internal feedback, or to any voltage within the speci-  
fied range using a standard resistor divider.  
Minimum start-up voltage — 0.85V  
Output voltage — fixed at 3.3V; adjustable from 1.8V  
to 5.0V  
Peak input current limit — 1.2A  
Output current at 3.3 VOUT — 80mA with VIN = 1.0V,  
190mA with VIN = 1.5V  
Forced PWM operation at all loads  
Efficiency up to 94%  
Internal synchronous rectifier  
No forward conduction path during shutdown  
Switching frequency — 1.2MHz  
Soft-start startup current limiting  
Shutdown current — 0.1μA (typ)  
Ultra-thin 1.5 × 2.0 × 0.6 (mm) MLPD-UT-6 package  
Lead-free and halogen-free  
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The SC121 operates exclusively in Pulse Width Modulation  
(PWM) mode for low ripple and fixed-frequency switching.  
Output disconnect capability is included to reduce leakage  
current, improve efficiency, and eliminate external com-  
ponents sometimes needed to disconnect the load from  
the supply during shutdown.  
WEEE and RoHS compliant  
Applications  
Low quiescent current is maintained with a high 1.2MHz  
operating frequency. Small external components and the  
space saving MLPD-UT-6, 1.5×2.0×0.6 (mm) package  
make this device an excellent choice for small handheld  
applications that require the longest possible battery life.  
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MP3 players  
Smart phones and cellular phones  
Palmtop computers and handheld instruments  
PCMCIA cards and memory cards  
Digital cordless phones  
Personal medical products  
Wireless VoIP phones  
Small motors  
Typical Application Circuit  
L1  
IN  
LX  
Single  
Cell  
OUT  
3.3V  
EN  
(1.2V)  
FB  
GND  
CIN  
COUT  
SC121  
April 13, 2010  
1
© 2010 Semtech Corporation  
1234567...23

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