• Equivalent Full-Range Temperature Coefficient of
50ppm/°C Typical
• Tem perature Compensated for Operation Over Full Rated
Operating Temperature Range
• Low Output Noise Voltage
• Fast Turn-on Response
Internal Block Diagram
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 V
(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.
Figure 8. Small Signal Voltage Amplification vs. FrequencyFigure 9.
Ambient Temperature
INPUT
OUTPUT
Time (us)
Pulse Response
5
KA431S/KA431SA/KA431SL
Typical Performance Characteristics
140
120
100
80
60
40
, CATHODE CURRENT(mA)
K
I
20
0
100p1n10n100n1
A
stable
Figure 10. Stability Boundary Conditions
5
4
3
2
Current(mA)
B
CL, LOAD CAPACITANCE
A VKA = Vref
B V
= 5.0 V @ IK = 10
KA
TA = 25oC
stable
mA
!
10
!
(Continued)
5
4
3
2
Current(mA)
1
0
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
Anode-Ref. Voltage(V)
Figure 11. Anode-Reference Diode Curve
1
0
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
Ref.-Cathode Voltage(V)
Figure 12. Ref erence-Catho de Diode Curve
6
Typical Application
KA431S/KA431SA/KA431SL
R
1
------ -
V
V
Figure 13. Shunt Regulator
+
1
=
O
KA431S
ref
R
2
Figure 14
-
KA431S
Figure 16. Curren t Li mi t or Cu rrent Source
R
1
------ -
=
VOV
.
Output Control for
+
1
ref
R
KA431S
2
Three-Termianl Fixed Regulator
Figure 17. Constant-Current Sink
R
1
------ -
V
V
+
1
=
O
R
2
ref
KA431S
Figure 15. High Current Shunt Regulator
KA431S
7
KA431S/KA431SA/KA431SL
Mechanical Dimensions
Package
Dimensions in millimeters
SOT-23F
8
Marking
KA431S/KA431SA/KA431SL
MF-
MF2-
43A
43B
43C
2% tolerance1% tolerance0.5% tolerance
43D
43A
43E
43B
43F
43C
2% tolerance1% tolerance0.5% tolerance
9
KA431S/KA431SA/KA431SL
Ordering Information
Product NumberOutput Voltage TolerancePackageOperating Temperature
KA431SLMF0.5% SOT-23F
KA431SAMF1%SOT-23F
KA431SMF2%SOT-23F
KA431SLMF20.5% SOT-23F
KA431SAMF21%SOT-23F
KA431SMF22%SOT-23F
-25 ~ +85°C
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHE R NOTICE TO ANY
PRODUCTS HEREI N TO IMPROVE RELIAB ILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME AN Y
LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER
DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.
LIFE SUPPORT POL I CY
FAIRCHILD’S PRODUCTS ARE NOT AUTH ORIZED FOR USE AS CRI TI CAL COMPONENTS IN L IFE SUPPORT DEVICES
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR
CORPORATION. As used herein :
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, and (c) whose failure to
perform when properly used in accordance with
instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of the
user.
www.fairchildsemi.com
2. A critical component in any component of a life support
device or system whose fa ilure to perform can be
reasonably expec ted to cause the failur e of the life support
device or system, or to affect its safety or effec t iv ene ss .
6/8/05 0.0m 001
2005 Fairchild Semiconductor Corporation
Stock#DSxxxxxxxx
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