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RS431
Adjustable Precision Shunt Regulator
General Description
The RS431 series are three‐terminal adjustable regulators with guaranteed thermal stability over applicable
temperature ranges. The output voltage may be set to any value between V
REF
(approximately 2.5 volts) and 36
volts with two external resistors. These devices have a typical dynamic output impedance of 0.2Ω. Active output
circuitry provides a very sharp turn‐on characteristic, making these devices excellent replacement for zener
diodes in many applications.
Features
●
●
●
●
●
●
●
Programmable Precise Output Voltage from 2.5V to 36V
High Stability under Capacitive Load
Low Temperature Deviation: 4.5mV Typical
Low Dynamic Output Resistance: 0.2Ω Typical
Sink Current Capacity from 1mA to 100mA
Low Output Noise
Wide Operating Range of ‐40 to 125
o
C
●
Low Equivalent Full‐range Temperature Coefficient with 20PPM/
o
C Typical
Application Circuits
Fig 1. V
K
=V
REF
I
I
IN
I
REF
I
K
V
REF
R
2
V
REF
V
K
Fig 2. V
K
>V
REF
I
I
IN
R
1
Fig 3. Off‐State Current
V
K
IN
V
K
I
REF
I
K
I
OFF
Note: V
K
=V
REF
(1+R
1
/R
2
)+I
REF
xR
1
This integrated circuit can be damaged by ESD. Orister Corporation recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
DS‐RS431‐09
September,
2009
www.Orister.com
Page No. : 2/10
Pin Assignments
SOT‐23
TO‐92
(STRAIGHT LEAD OPTION)
TO‐92
(FORMED LEAD OPTION)
PACKAGE
SOT‐23
PIN
1
2
3
PIN
1
2
3
DESCRIPTION
REFERENCE
CATHODE
ANODE
DESCRIPTION
REFERENCE
ANODE
CATHODE
PACKAGE
TO‐92
Ordering Information
DEVICE
DEVICE CODE
X is Reference voltage precision designator:
A: 2.5V ±0.4%
B: 2.5V ±0.8%
YY is package designator :
A: TO‐92 (Straight lead option)
AT: TO‐92 (Formed lead option)
N: SOT‐23
Z is Lead Free designator :
P: Commercial Standard, Lead (Pb) Free and Phosphorous (P) Free Package
G: Green (Halogen Free with Commercial Standard)
RS431 X YY Z
Block Diagram
Functional Block Diagram
Symbol
Cathode
Reference
Anode
DS‐RS431‐09
September,
2009
www.Orister.com
Page No. : 3/10
Absolute Maximum Ratings
(Operating temperature range applies unless otherwise specified)
Characteristics
Cathode Voltage
Cathode Current Range (Continuous)
Reference Input Current Range
Power Dissipation
Symbol
V
KA
I
K
I
REF
P
D
SOT‐23
TO‐92
‐‐
‐‐
‐40 ‐ +125
‐65 ‐ +150
Value
40
‐100 ‐ +150
0.05 ‐ +10
370
770
‐‐
‐‐
Unit
V
mA
mA
mW
o
o
Operating Temperature Range (Max.)
Storage Temperature Range
T
OPR
T
STG
C
C
Operating Conditions
Characteristics
Cathode Voltage
Cathode Current Range (Continuous)
Operating Ambient Temperature Range
Symbol
V
KA
I
K
T
OPR
Min.
V
REF
1
‐40
Max.
36
100
125
Unit
V
mA
o
C
Electrical Characteristics
(T
A
=25°C, unless otherwise specified)
Characteristics
2.5V ±0.4%
2.5V ±0.8%
Deviation of Reference Input Voltage Over‐
Temperature (Fig1)
Ratio of Change in Reference Input Voltage to the
Change in Cathode Voltage (Fig2)
Reference Input Voltage (Fig1)
Reference Input Current (Fig2)
Deviation of Reference Input Current Over Full
Temperature Range (Fig2)
Minimum Cathode Current for Regulation (Fig1)
Off‐State Cathode Current (Fig3)
Dynamic Output Impedance (Fig1)
Symbol
V
REF
V
REF(dev)
Test Conditions
V
K
=V
REF
, I
K
=10mA
Min
2.49
2.48
‐
‐
‐
‐
‐
‐
‐
‐
Typ
2.50
2.50
4.5
1.0
0.5
0.7
0.4
0.4
0.05
0.15
Max
2.51
2.52
16
2.7
2.0
4
1.2
1.0
1.0
0.5
Unit
V
mV
mV/V
mV/V
uA
uA
mA
uA
Ω
V
K
=V
REF
, I
K
=10mA
T
MIN
≤T
A
≤T
MAX
(‐40 ‐ +125
o
C)
I =10mA,, ΔV
K
=10V to V
REF
ΔV
REF
/ΔV
K K
I
K
=10mA,, ΔV
K
=36V to 10V
I
REF
I
K
=10mA, R1=10KΩ, R2=∞
I =10mA, R1=10KΩ
I
REF(dev)
K
R2=∞, Ta=‐40 ‐ +125
o
C
I
K(min)
V
K
=V
REF
I
K(off)
V
K
=36V, V
REF
=0
Z
K
V
K
=V
REF
, f≤1kHz, I
K
=1 to 100mA
DS‐RS431‐09
September,
2009
www.Orister.com
Page No. : 4/10
Typical Performance Characteristics
DS‐RS431‐09
September,
2009
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Page No. : 5/10
Typical Performance Characteristics (Continued)
DS‐RS431‐09
September,
2009
www.Orister.com
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