SC431LCSK-.5TR

Manufacturer Part NumberSC431LCSK-.5TR
DescriptionAdjustable Shunt Regulator
ManufacturerSemtech Corporation
SC431LCSK-.5TR datasheet
 


Specifications of SC431LCSK-.5TR

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POWER MANAGEMENT
Description
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
) to 20V with two external
REF
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.
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.
Typical Application Circuit
(1)(2)
Revision: May 16, 2008
Low Voltage Adjustable
Shunt Regulator
Features
Low voltage operation (down to 1.24V)
Wide operating current range 100µA to 100mA
Low dynamic output impedance 0.05
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
Computer Disk Drives
Notes:
1) Set V
according to the following equation:
OUT
R
1
V
V
1
I
R
1
OUT
REF
REF
R
2
2) Choose the value for R as follows:
The maximum limit for R should be such that the
cathode current, I
, is greater than the minimum
Z
operating current (100µA) at V
IN(MIN)
The minimum limit for R should be such that I
not exceed 100mA under all load conditions, and the
instantaneous turn-on value for I
150mA. Both of the following conditions must be met:
V
IN
(max)
(to limit instantaneous turn-on I
R
min
150
mA
V
V
IN
(max)
OUT
R
(to limit I
min
I
100
mA
OUT
(min)
operating conditions)
1
SC431L
typ.
.
does
Z
does not exceed
Z
)
Z
under normal
Z
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SC431LCSK-.5TR Summary of contents