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SC431LCSK-25TRT Datasheet(PDF) 1 Page - Semtech Corporation |
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SC431LCSK-25TRT Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 10 page  POWER MANAGEMENT 1 www.semtech.com SC431L Low Voltage Adjustable Shunt Regulator Description Features Revision: May 16, 2008 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 (V REF) to 20V with two external resistors. The SC431L has a typical dynamic output impedance of 0.05 Ω. Active output circuitry provides a very sharp turn on characteristic, making the SC431L an excellent replacement for zener diodes. 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. Linear Regulators Adjustable Supplies Switching Power Supplies Battery Operated Computers Instrumentation Computer Disk Drives Low voltage operation (down to 1.24V) Wide operating current range 100µA to 100mA Low dynamic output impedance 0.05 Ω 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 Notes: 1) Set V OUT according to the following equation: 1 R I 2 R 1 R 1 V V REF REF OUT + + = 2) Choose the value for R as follows: • The maximum limit for R should be such that the cathode current, I Z, is greater than the minimum operating current (100µA) at V IN(MIN). • The minimum limit for R should be such that I Z does not exceed 100mA under all load conditions, and the instantaneous turn-on value for I Z does not exceed 150mA. Both of the following conditions must be met: mA 150 V R (max) IN min ≥ (to limit instantaneous turn-on I Z) mA 100 I V V R (min) OUT OUT (max) IN min + − ≥ (to limit I Z under normal operating conditions) Applications Typical Application Circuit(1)(2) |
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