AS431H
ADJUSTABLE PRECISION SHUNT REGULATORS
Description
The AS431H is a three-terminal adjustable shunt regulator with
guaranteed thermal stability over a full operation range. It features
sharp turn-on characteristics, low temperature coefficient and low
output impedance, which make it ideal substitute for Zener diode in
applications such as switching power supply, charger and other
adjustable regulators.
Pin Assignments
(Top View)
ANODE
3
NEW PRODUCT
The output voltage of AS431H can be set to any value between V
REF
(2.495V) and the corresponding maximum cathode voltage (36V).
1
The AS431H precision reference is offered in two voltage tolerance:
0.5% and 1.0%.
This IC is available in 2 packages: TO92 (Ammo Packing) and
SOT23.
2
CATHODE
REF
SOT23
(Normal Pin-out)
(Top View)
Features
Programmable Precise Output Voltage from 2.495V to 36V
High Stability under Capacitive Load
Low Temperature Deviation: 5mV Typical
Low Equivalent Full-range
20PPM/° Typical
C
Low Output Noise
Wide Operating Range of -40 to +125°
C
Lead-Free Packages, Available in “Green” Molding Compound:
SOT23, TO92 (Ammo Packing)
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Temperature
Coefficient
with
ANODE
3
1
2
Sink Current Capacity from 0.5mA to 100mA
CATHODE
REF
SOT23
(Mirror Pin-out)
(Top View)
3
CATHODE
ANODE
REF
Applications
Charger
Voltage Adapter
Switching Power Supply
Graphic Card
Precision Voltage Reference
2
1
TO92 (Ammo Packing)
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
AS431H
Document number: DS39284 Rev. 1 - 2
1 of 15
www.diodes.com
January 2017
© Diodes Incorporated
AS431H
Typical Applications Circuit
(Cont.)
NEW PRODUCT
Current Source or Current Limit
Precision 5V 1A Regulator
PWM Converter with Reference
AS431H
Document number: DS39284 Rev. 1 - 2
3 of 15
www.diodes.com
January 2017
© Diodes Incorporated
AS431H
Functional Block Diagram
NEW PRODUCT
Absolute Maximum Ratings
(Note 4)
Symbol
V
KA
I
KA
I
REF
θ
JA
T
J
T
STG
ESD
Note 4:
Parameter
Cathode Voltage
Cathode Current Range (Continuous)
Reference Input Current Range
SOT23
Thermal Resistance
Rating
40
-100 to 150
10
380
Unit
V
mA
mA
°
C/W
TO92 (Ammo Packing)
Junction Temperature
Storage Temperature Range
ESD (Human Body Model)
+150
-65 to +150
2000
165
°
C
°
C
V
Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “Recommended Operating Conditions” is not implied.
Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability.
Recommended Operating Conditions
Symbol
V
KA
I
KA
T
A
Parameter
Cathode Voltage
Cathode Current
Operating Ambient Temperature Range
Min
V
REF
0.5
-40
Max
36
100
+125
Unit
V
mA
°
C
AS431H
Document number: DS39284 Rev. 1 - 2
4 of 15
www.diodes.com
January 2017
© Diodes Incorporated
AS431H
Electrical Characteristics
(Operating Conditions: T
A
= +25° unless otherwise specified.)
C,
Symbol
V
REF
Parameter
0.5%
Reference Voltage
1.0%
0 to +70°
C
∆V
REF
Deviation of Reference Voltage
Over Full Temperature Range
Ratio of Change in Reference
Voltage to the Change in Cathode
Voltage
Reference Current
Deviation of Reference Current
Over Full Temperature Range
Minimum Cathode Current for
Regulation
Off-state Cathode Current
Dynamic Impedance
Thermal Resistance
4
V
KA
= V
REF
,
I
KA
= 10mA
-40 to +85°
C
-40 to +125°
C
∆V
REF
∆V
KA
I
REF
∆I
REF
I
KA
(Min)
I
KA
(Off)
Z
KA
θ
JC
∆V
KA
= 10V to V
REF
5
5
5
4
6
4
—
I
KA
= 10mA
∆V
KA
= 36V to 10V
Test
Circuit
4
Conditions
V
KA
= V
REF
, I
KA
= 10mA
Min
2.483
2.470
—
—
—
—
—
—
—
—
—
—
—
—
Typ
2.495
2.495
5
5
5
-1.0
-0.5
0.7
0.4
0.35
0.002
0.15
136
80
Max
2.507
V
2.520
8
14
16
-2.7
mV/V
-2.0
4
1.2
0.5
0.5
0.5
—
—
°
C/W
µA
µA
mA
µA
Ω
mV
Unit
NEW PRODUCT
I
KA
= 10mA, R1 = 10kΩ, R2 =
∞
I
KA
= 10mA, R1 = 10kΩ, R2 =
∞
,
T
A
= -40 to +125°
C
V
KA
= V
REF
V
KA
= 36V, V
REF
= 0
V
KA
= V
REF
, I
KA
= 0.5 to 100mA,
f ≤ 1.0KHz
SOT23
TO92 (Ammo Packing)
AS431H
Document number: DS39284 Rev. 1 - 2
5 of 15
www.diodes.com
January 2017
© Diodes Incorporated
Analog electronics
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