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Fairchild
Fairchild

KA431SAMF2 Datasheet

Programmable Shunt Regulator


KA431SAMF2 Datasheet Preview


www.fairchildsemi.com
KA431S/KA431SA/KA431SL
Programmable Shunt Regulator
Features
• Programmable Output Voltage to 36 Volts
• Low Dynamic Output Impedance 0.20 Typical
• Sink Current Capability of 1.0 to 100mA
• Equivalent Full-Range Temperature Coefficient of
www.DataSheet4U.co5m0ppm/°C Typical
• Temperature Compensated for Operation Over Full Rated
Operating Temperature Range
• Low Output Noise Voltage
• Fast Turn-on Response
Description
The KA431S/KA431SA/KA431SL are three-terminal
adjustable regulator series with a guaranteed thermal
stability over applicable temperature ranges. The output
voltage may be set to any value between VREF
(approximately 2.5 volts) and 36 volts with two external
resistors These devices have a typical dynamic output
impedance of 0.2W Active output circuitry provides a very
sharp turn on characteristic, making these devices excellent
replacement for zener diodes in many applications.
SOT-23F
3
12
MF- 1.Cathode 2. Ref 3. Anode
MF2- 1. Ref 2. Cathode 3. Anode
Internal Block Diagram
REFERENCE
+
-
2.5 Vref
REFERENCE (R)
ANODE
CATHODE (K)
ANODE(A)
CATHODE
©2005 Fairchild Semiconductor Corporation
Rev. 1.0.6
Page 1

KA431S/KA431SA/KA431SL
Absolute Maximum Ratings
(Operating temperature range applies unless otherwise specified.)
Parameter
Cathode Voltage
Cathode Current Range (Continuous)
Reference Input Current Range
Thermal Resistance Junction-Air (Note1,2)
MF Suffix Package
Power Dissipation (Note3,4)
MF Suffix Package
www.DataSheet4U.cJoumnction Temperature
Operating Temperature Range
Storage Temperature Range
Symbol
VKA
IKA
IREF
RθJA
PD
TJ
TOPR
TSTG
Value
37
-100 ~ +150
-0.05 ~ +10
350
350
150
-25 ~ +85
-65 ~ +150
Note :
1. Thermal resistance test board
Size: 76.2mm * 114.3mm * 1.6mm (1S0P)
JEDEC Standard: JESD51-3, JESD51-7
2. Assume no ambient airflow.
3. TJMAX = 150°C, Ratings apply to ambient temperature at 25°C
4. Power dissipation calculation: PD = (TJ - TA)/RθJA
Recommended Operating Conditions
Parameter
Cathode Voltage
Cathode Current
Symbol
VKA
IKA
Min.
VREF
1.0
Typ.
-
-
Max.
36
100
Unit
V
mA
mA
°C/W
mW
°C
°C
°C
Unit
V
mA
2
Page 2

KA431S/KA431SA/KA431SL
Electrical Characteristics
(TA = +25°C, unless otherwise specified)
Parameter Symbol
Conditions
KA431S
KA431SA
KA431SL
Unit
Min. Typ. Max. Min. Typ. Max. Min. Typ. Max.
Reference Input
Voltage
VREF
VKA=VREF,
IKA=10mA
2.450 2.500 2.550 2.470 2.495 2.520 2.482 2.495 2.508 V
Deviation of
Reference
Input Voltage
Over-
Temperature
VREF/
T
VKA=VREF,
IKA=10mA
TMINTATMAX
- 4.5 17
- 4.5 17 - 4.5 17 mV
www.DataSheet4U.cRoamtio of Change
in Reference
Input Voltage
VREF/
VKA
to the Change in
Cathode
Voltage
IKA
=10mA
VKA=10
V-VREF
VKA=36
V-10V
-
-
-1.0 -2.7
-0.5 -2.0
- -1.0 -2.7
- -0.5 -2.0
-
-
-1.0 -2.7
mV/V
-0.5 -2.0
Reference Input
Current
IREF
IKA=10mA,
R1=10k,R2=
- 1.5 4
- 1.5 4
- 1.5 4 µA
Deviation of
Reference
Input Current
Over Full
Temperature
Range
IKA=10mA,
IREF/T
R1=10k,R2=
TA =Full Range
- 0.4 1.2 - 0.4 1.2 - 0.4 1.2 µA
Minimum
Cathode Cur-
rent for
Regulation
IKA(MIN) VKA=VREF
- 0.45 1.0
- 0.45 1.0 - 0.45 1.0 mA
Off - Stage
Cathode
Current
IKA(OFF)
VKA=36V,
VREF=0
- 0.05 1.0
- 0.05 1.0
- 0.05 1.0 µA
Dynamic
Impedance
VKA=VREF,
ZKA IKA=1 to 100mA
f 1.0kHz
- 0.15 0.5
- 0.15 0.5 - 0.15 0.5
• TMIN = -25°C, TMAX = +85°C
3
Page 3
Part Number KA431SAMF2
Manufactur Fairchild
Description Programmable Shunt Regulator
Total Page 10 Pages
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