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SC4538ULTRT

更新时间： 2024-11-23 03:12:39
品牌 Logo 应用领域
商升特 - SEMTECH 转换器升压转换器
页数 文件大小 规格书
14页 236K
描述
High Effi ciency Boost Converter for up to 10 LEDs

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中文翻译

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SC4538ULTRT 技术参数

是否无铅： 不含铅是否Rohs认证： 符合
生命周期：Obsolete零件包装代码：SOIC
包装说明：2 X 2 MM, 0.60 MM HEIGHT, ROHS COMPLIANT, MLPD-8针数：8
Reach Compliance Code：compliantECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.81
接口集成电路类型：LED DISPLAY DRIVERJESD-30 代码：S-XDSO-N8
JESD-609代码：e4长度：2 mm
湿度敏感等级：1功能数量：1
区段数：1端子数量：8
最高工作温度：85 °C最低工作温度：-40 °C
封装主体材料：UNSPECIFIED封装代码：HVSON
封装形状：SQUARE封装形式：SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE
峰值回流温度（摄氏度）：260认证状态：Not Qualified
座面最大高度：0.6 mm最大供电电压：5.5 V
最小供电电压：2.8 V标称供电电压：3.6 V
表面贴装：YES温度等级：INDUSTRIAL
端子面层：Nickel/Palladium/Gold (Ni/Pd/Au)端子形式：NO LEAD
端子节距：0.5 mm端子位置：DUAL
处于峰值回流温度下的最长时间：NOT SPECIFIED宽度：2 mm
Base Number Matches：1

SC4538ULTRT 数据手册

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SC4538  
High Efficiency Boost Converter  
for up to 10 LEDs  
POWER MANAGEMENT  
Features  
Description  
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Input voltage range — 2.8V to 5.5V  
Current-mode PWM control — 800kHz  
Programmable LED current up to 30mA  
Soft-start to reduce in-rush current  
PWM dimming — 100Hz to 50kHz  
Analog and filtered-PWM dimming at ISET  
Over-voltage protection — 38V (min.)  
Under-voltage lockout (UVLO)  
Thermal shutdown  
Shutdown current — <1μA  
Ultra-thin package — 2mm x 2mm x 0.6mm  
Lead-free package, WEEE and RoHS compliant  
The SC4538 is designed to regulate current for a series  
chain of white LEDs in LCD backlighting applications  
where small size and high efficiency are priorities. This  
device integrates an 800kHz current-mode PWM boost  
converter and a 30mA programmable low dropout current  
sink regulator.  
An external resistor sets the LED current up to 30mA.  
PWM dimming (100Hz to 50kHz) may be applied directly  
to the enable (EN) pin, or dimming can be controlled by  
applying an analog signal to the ISET circuit. The SC4538  
drives a string of up to 10 white LEDs with a forward  
voltage of 3.8V or less. The current regulator protects  
against shorts between the BL and OUT pins and also  
eliminates backlight glow during shutdown when using  
LEDs with high leakage. Under-voltage lockout and  
thermal shutdown provide additional protection. A small  
external capacitor and series resistor control soft-start and  
loop compensation. Over-voltage detection protects the  
SC4538 if the LED pin is floating or shorted to ground.  
Applications  
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White LED Display Backlight Driver  
Smartphones and PDAs  
Cellular Handsets  
MP3 and Portable Media Players  
DSC, GPS, Satellite Radio, Game Players  
The SC4538 is available in an MLPD-8 pin 2mmx 2xmm  
0.6mm package, with a rated temperature range of -40°C  
to +85°C.  
Typical Application Circuit  
D
L1  
LX  
COUT  
2.8 to  
5.5V  
IN  
OUT  
CIN  
SC4538  
Enable and  
PWM dimming  
EN  
RISET  
ISET  
CCOMP  
RCOMP  
COMP  
BL  
GND  
July 11, 2007  
1
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中文翻译

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