Shunt Regulator. SC431M Datasheet

SC431M Regulator. Datasheet pdf. Equivalent

SC431M Datasheet
Recommendation SC431M Datasheet
Part SC431M
Description Adjustable Shunt Regulator
Feature SC431M; SC431M Adjustable Shunt Regulator Features  Wide operating current range 130μA to 150mA  Low dyna.
Manufacture Semtech
Datasheet
Download SC431M Datasheet




Semtech SC431M
SC431M
Adjustable Shunt Regulator
Features
Wide operating current range 130μA to 150mA
Low dynamic output impedance 0.25Ω typ.
Trimmed bandgap + 0.5%
Alternate for TL1431, TL431, LM431& AS431
Military temperature range
Available in SOT-23-3 package, fully WEEE and RoHS
compliant
Applications
Linear Regulators
Switching Power Supplies
Typical Application Circuit
Description
The SC431M is a three terminal adjustable shunt regulator
with thermal stability guaranteed over temperature. The
output voltage can be adjusted to any value from 2.5V (VREF) to
30V with two external resistors.
The SC431M has a typical dynamic output impedance of
0.25Ω. Active output circuitry provides a very sharp turn on
characteristic, making the SC431M an excellent replacement
for Zener diodes.
The SC431M shunt regulator is available with a 0.5% voltage
tolerance over TA = -55°C to +125°C and comes in a SOT-23-3
package.
Notes:
1) Set VOUT according to the following equation:
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 (130μA) at VIN(MIN).
The minimum limit for R should be such that IZ does
not exceed 150mA under all load conditions, and the
instantaneous turn-on value for IZ does not exceed
200mA. Both of the following conditions must be met:
(to limit instantaneous turn-on IZ)
(to limit IZ under normal operating conditions)
SC431M
Final Datasheet
August 1, 2017
Rev. 2.0
www.semtech.com
Page 1 of 10



Semtech SC431M
Pin Configuration
Marking Information
Ordering Information
Device
Package
SC431MSKQTRT (1)(2)
SOT-23-3
Notes:
(1): Only available in tape and reel packaging. A reel contains 3,000 devices. Consult factory for smaller quantities.
(2): This product is fully WEEE and RoHS compliant.
SC431M
Final Datasheet
August 1, 2017
Rev. 2.0
www.semtech.com
Page 2 of 10



Semtech SC431M
Absolute Maximum Ratings
Parameter
Symbol
Value
Cathode Voltage
VZ 31
Continuous Cathode Current
IZ 150
Reference Input Current
IREF 10
Power Dissipation at TA = 25°C
SOT-23-3
PD 0.37
Thermal Resistance
SOT-23-3
θJA 336
Operating Ambient Temperature Range
TA -55 to +125
Operating Junction Temperature Range
TJ -55 to +150
Storage Temperature Range
TSTG -65 to +150
Lead Temperature (Soldering) 10 seconds
TLEAD
300
ESD Rating (Human Body Model)
VESD
2
Notes:
(1): If multiple diodes conduct in the forward direction at any instant, the sum of the currents must not exceed this rating.
(2): ESD Gun return path to Ground Reference Plane (GRP)
(3): Any one diode to ambient.
Units
V
mA
mA
W
°C/W
°C
°C
°C
°C
kV
Electrical Characteristics
Unless specified: TA = 25°C. Values in bold apply over full operating ambient temperature range.
Parameter
Symbol Conditions
Reference Voltage
VREF Temp Deviation
Ratio of Change in
VREF to Change in VZ
VREF
VDEV
ΔVREF
ΔVZ
VZ = VREF, IZ = 10mA(1)
VZ = VREF, IZ = 10mA(1)
IZ = 10mA,ΔVZ =10V to VREF
IZ = 10mA,ΔVZ =30V to 10V
Reference Input Current
IREF
R1 = 10kΩ, R2 = ∞,
IZ = 10mA(2)
IREF Temperature Deviation
IREF(DEV)
R1 = 10kΩ, R2 = ∞,
IZ = 10mA(2)
Off-State Cathode Current
IZ(OFF)
Dynamic Output Impedance
rZ
Minimum Operating
Current
Notes:
(1): See Test Circuit 1 on page 4.
(2): See Test Circuit 2 on page 4.
(3): See Test Circuit 3 on page 4.
IZ(MIN)
VREF = 0V, VZ = 30V(3)
f < 1kHz, VZ = VREF
IZ = 130μA to 100mA(1)
VZ
=
V (1)
REF
Min. Typ. Max. Units
2.482 2.495 2.507
8 17
V
mV
-0.5 -2.7
mV/V
-1.0 -2.0
0.5 4
μA
0.4 1.2
0.04 0.5
0.25 0.5
130
μA
μA
Ω
μA
SC431M
Final Datasheet
August 1, 2017
Rev. 2.0
www.semtech.com
Page 3 of 10







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