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SC431LI5SK-2TRT PDF预览

SC431LI5SK-2TRT

更新时间: 2024-11-06 06:10:15
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商升特 - SEMTECH 稳压器
页数 文件大小 规格书
10页 209K
描述
Low Voltage Adjustable Shunt Regulator

SC431LI5SK-2TRT 数据手册

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SC431L  
Low Voltage Adjustable  
Shunt Regulator  
POWER MANAGEMENT  
Description  
Features  
The SC431L is a three terminal adjustable shunt  
regulator with thermal stability guaranteed over  
temperature. The output voltage can be adjusted to any  
value from 1.24V (VREF) to 20V with two external  
resistors. The SC431L has a typical dynamic output  
impedance of 0.05. Active output circuitry provides a  
very sharp turn on characteristic, making the SC431L an  
excellent replacement for zener diodes.  
‹ Low voltage operation (down to 1.24V)  
‹ Wide operating current range 100µA to 100mA  
‹ Low dynamic output impedance 0.05 typ.  
‹ Trimmed bandgap design ± 0.25%  
‹ Upgrade for TLV431A  
‹ SOT-23-3 and SOT-23-5 packages. Also available in  
Lead-free package, fully WEEE and RoHS compliant  
Applications  
‹ Linear Regulators  
‹ Adjustable Supplies  
‹ Switching Power Supplies  
‹ Battery Operated Computers  
‹ Instrumentation  
The SC431L shunt regulator is available with four volt-  
age tolerances (0.25%, 0.5%, 1.0% and 2.0%), two  
operating temperature ranges (commercial and indus-  
trial) and two package options (SOT-23-3 and SOT-23-  
5). This allows the designer the opportunity to select the  
optimum combination of cost and performance for their  
application.  
‹ Computer Disk Drives  
Typical Application Circuit(1)(2)  
Notes:  
1) Set VOUT according to the following equation:  
R1  
R2  
VOUT = VREF 1+  
+IREF R1  
2) Choose the value for R as follows:  
The maximum limit for R should be such that the  
cathode current, IZ, is greater than the minimum  
operating current (100µA) at VIN(MIN)  
.
The minimum limit for R should be such that IZ does  
not exceed 100mA under all load conditions, and the  
instantaneous turn-on value for IZ does not exceed  
150mA. Both of the following conditions must be met:  
VIN(max)  
150 mA  
R min  
(to limit instantaneous turn-on IZ)  
VIN(max) VOUT  
IOUT (min) +100 mA  
Rmin  
(to limit IZ under normal  
operating conditions)  
Revision: May 16, 2008  
1
www.semtech.com  

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