Adjustable Precision Shunt Regulator
ST432
DESCRIPTION
ST432 is low-voltage three-terminal adjustable voltage references, with specified
thermal stability over applicable industrial and commercial temperature ranges. Output
voltage can be set to any value between VREF (1.24V) and 20V with two external
resistors. These devices have a typical output impedance of 0.25Ω. Active output
circuitry provides a very sharp turn-on characteristic, making the ST432 excellent
replacements for low-voltage Zener diodes in many applications, including onboard
regulation and adjustable power supplies.
FEATURES
Low-Voltage Operation down to 1.24 V
Drivers augmentation Voltage, V
OUT
= Vref
Adjustable Output
to 20 V
Low Operational Cathode Current 80uA
0.25Ω Typical Output Impedance
PIN CONFIGURATION
SOT-23
TO-92
SOT-23-5L
SOT-353 ( SC-70 )
APPLICATIONS
Battery Power Equipment
Linear Regulators
Switch Power Supply
Cellular Phone
Digital Camera
Computer Disk
PART MARKING
SOT-23
TO-92
SOT-23-5L
SOT-353 ( SC-70 )
STANSON TECHNOLOGY
120 Bentley Square, Mountain View, Ca 94040 USA
http://www.stansontech.com
ST432 2007. V1
Adjustable Precision Shunt Regulator
ST432
PIN DESCRIPTION
Pin
1
2
3
Symbol
R
C
A
Description
REF
CATHODE
ANODE
ORDERING INFORMATION
Part Number
Voltage Tolerance
Package
Part Marking
ST432AS23RG
0.5%
SOT-23
32AYW
ST432BS23RG
1.0%
SOT-23
32BYW
ST432AS25RG
0.5%
SOT-23-5L
32AYW
ST432BS25RG
1.0%
SOT-23-5L
32BYW
ST432BT92AG
1.0%
TO-92
SP432B
ST432AS35RG
0.5%
SOT-353
32AYW
ST432BS35RG
1.0%
SOT-353
32BYW
※
Week Code : A ~ Z ( 1 ~ 26 ) ; a ~ z ( 27 ~ 52 )
※
ST432XS23RG : X: Tolerance; R: Tape Reel; A: Tape Ammo; G: Pb – Free
STANSON TECHNOLOGY
120 Bentley Square, Mountain View, Ca 94040 USA
http://www.stansontech.com
ST432 2007. V1
Adjustable Precision Shunt Regulator
ST432
TYPICAL APPLICATION CIRCUIT
BLOCK DIAGRAM
ABSOULTE MAXIMUM RATINGS
(T
A
=25℃ unless otherwise specified)
Parameter
Cathode Voltage
Continuous Cathode Current
Reference Current
Operation Junction Temperature Range
Storage Temperature Range
Lead Temperature Range
(Soldering 10sec.)
Thermal Resistance
Ө
JA
Symbol
V
Z
I
Z
I
REF
T
J
T
STG
T
SOL
TO-92
SOT-23
SOT-23-5L
SOT-353
Value
20
100
3
-40 ~ +150
-65 ~ +150
260
140
206
206
252
Unit
V
mA
mA
℃
℃
℃
℃/W
The IC has a protection circuit against static electricity. Do not apply high static electricity or high voltage
that exceeds the performance of the protection circuit to the IC.
STANSON TECHNOLOGY
120 Bentley Square, Mountain View, Ca 94040 USA
http://www.stansontech.com
ST432 2007. V1
Adjustable Precision Shunt Regulator
ST432
ELECTRICAL CHARACTERISTICS
(TA=25℃, unless otherwise specified)
SP432AS23RG & SP432AS25RG & SP432AS35RG
Conditions
V
Z
= V
REF
T
A
=25℃
Reference Voltage for 432A
V
REF
I
Z
= 10mA T
A
=-40℃~+80℃
V
Z
= V
REF
T
A
=25℃
Reference Voltage for 432B
V
REF
I
Z
= 10mA T
A
=-40℃~+80℃
T
A
=-40℃~+80℃
V
REF
Temp Deviation
V
DEV
V
Z
= V
REF
, I
Z
= 10mA
Ratio of change in V
REF
to
∆V
REF
/ I
Z
= 10mA
change in Cathode voltage
∆V
Z
∆V
Z
= 16V ~ V
REF
Reference Input Current
I
REF
Temp Deviation
Off state Cathode Current
Dynamic output impedance
Minimum Operation Current
I
REF
I
REF(DEV)
I
Z(OFF)
R
Z
I
Z(MIN)
R1=10KΩ, R2=
∞,I
Z
= 10mA
T
A
=-40℃~+80℃
R1=10KΩ,R2=∞, I
Z
= 10mA
V
Z
= 6V
V
REF
= 0V
V
Z
= 12V
f < 1KHZ , VZ = VREF
I
Z
= 1mA ~ 100mA
V
Z
= V
REF
Parameter
Symbol
Min.
1.234
1.222
1.228
1.215
Typ. Max. Unit
1.24 1.246
V
1.258
1.24 1.252
V
1.265
10
-1.0
0.15
0.1
0.5
0.25
30
25
-2.7
0.5
0.4
1.0
0.4
80
mV
mV/
V
uA
uA
uA
Ω
uA
APPLICATION CIRCUIT
STANSON TECHNOLOGY
120 Bentley Square, Mountain View, Ca 94040 USA
http://www.stansontech.com
ST432 2007. V1
Adjustable Precision Shunt Regulator
ST432
APPLICATION CIRCUIT
To improve the stability of output voltage, a 0.1uf
capacitor is recommended between cathodes to
anode
STANSON TECHNOLOGY
120 Bentley Square, Mountain View, Ca 94040 USA
http://www.stansontech.com
ST432 2007. V1
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