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RS432
Adjustable Precision Shunt Regulator
General Description
The RS432 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 1.24 or 1.25
volts) and 18 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 1.24V or 1.25V to 16V
High Stability under Capacitive Load
Low Dynamic Output Resistance: 0.2Ω Typical
Fast turn on response
Low Output Noise
Wide Operating Range of ‐40 to 125
o
C
Low Equivalent Full‐range Temperature Coefficient with 50ppm/
o
C Typical
SOT‐23, SOT‐89 and TO‐92 Packages
●
RoHS Compliant and 100% Lead (Pb)‐Freeand Green (Halogen Free with CommercialStandard)
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
V
K
Fig 3. Off‐State Current
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‐RS432‐07
September, 2009
www.Orister.com
Page No. : 2/10
Pin Assignments
SOT‐23
SOT‐89
TO‐92
(STRAIGHT LEAD OPTION)
TO‐92
(FORMED LEAD OPTION)
PACKAGE
SOT‐23
PACKAGE
SOT‐89
PACKAGE
TO‐92
PIN
1
2
3
DESCRIPTION
REFERENCE
ANODE
CATHODE
PIN
1
2
3
DESCRIPTION
REFERENCE
ANODE
CATHODE
PIN
1
2
3
DESCRIPTION
REFERENCE
CATHODE
ANODE
Ordering Information
DEVICE
DEVICE CODE
X is Reference voltage precision designator:
A: 1.24V ±2.0%
B: 1.24V ±1.0%
C: 1.24V ±0.5%
D: 1.25V ±2.0%
E: 1.25V ±1.0%
F: 1.25V ±0..5%
YY is package designator :
N: SOT‐23
M: SOT‐89
A: TO‐92 (Straight lead option)
AT: TO‐92 (Formed lead option)
Z is Lead Free designator :
P: Commercial Standard, Lead (Pb) Free and Phosphorous (P) Free Package
G: Green (Halogen Free with Commercial Standard)
RS432 X YY Z
DS‐RS432‐07
September, 2009
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Page No. : 3/10
Block Diagram
Functional Block Diagram
Symbol
Cathode
Reference
Anode
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
SOT‐89
TO‐92
‐‐
‐40 ‐ +125
‐65 ‐ +150
Value
18
20
10
370
770
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
0.1
‐40
Max.
16
20
125
Unit
V
mA
o
C
Electrical Characteristics
(T
A
=25°C, unless otherwise specified)
Characteristics
1.24V ±2.0%
1.24V ±1.0%
1.24V ±0.5%
Reference Input Voltage (Fig1)
1.25V ±2.0%
1.25V ±1.0%
1.25V ±0.5%
Ratio of Change in Reference Input Voltage to the
Change in Cathode Voltage (Fig2)
Reference Input Current (Fig2)
Minimum Cathode Current for Regulation (Fig1)
Off‐State Cathode Current (Fig3)
Dynamic Output Impedance (Fig1)
Symbol
Test Conditions
V
REF
V
K
=V
REF
, I
K
=10mA
Min
1.215
1.228
1.234
1.225
1.238
1.244
‐
‐
‐
‐
‐
Typ
1.24
1.24
1.24
1.25
1.25
1.25
1.0
0.15
20
0.01
0.04
0.2
Max
1.265
1.252
1.246
1.275
1.262
1.256
2.7
0.5
80
0.05
0.15
0.4
Unit
V
ΔV
REF
/ΔV
K
I
K
=10mA,, ΔV
K
=18V to V
REF
I
REF
I
K(min)
I
K(off)
Z
K
I
K
=10mA, R1=10KΩ, R2=∞
V
K
=V
REF
V
K
=6V, V
REF
=0
V
K
=16V, V
REF
=0
V
K
=V
REF
, f≤1kHz, I
K
=100uA to
20mA
mV/V
uA
uA
uA
Ω
DS‐RS432‐07
September, 2009
www.Orister.com
Page No. : 4/10
Typical Performance Characteristics
DS‐RS432‐07
September, 2009
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Page No. : 5/10
DS‐RS432‐07
September, 2009
www.Orister.com
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