Low Temperature Coefficient ........................30 ppm/°C
Offered in SOT-23, TO-92 & SOT 89
Low Output Noise
APPLICATIONS
•
•
•
•
•
•
•
Battery Operating Equipment
Adjustable Supplies
Switching Power Supplies
Error Amplifiers
Single Supply Amplifier
Monitors / VCR / TV
Personal Computers
PRODUCT DESCRIPTION
The AS3431 is a 3-terminal Adjustable Shunt Voltage Regulator providing a highly accurate 0.5% bandgap reference. AS3431 acts as
an open-loop error amplifier with a 2.5V temperature compensation reference. The AS3431 thermal stability, wide operating current
(100mA) and temperature range (0°C to 105°C) makes it suitable for all variety of applications that are looking for a low cost solution
with high performance.
AS3431 tolerance of 0.5% is proven to be sufficient to overcome all the other errors in the system to
virtually eliminate the need for trimming in the power supply manufactures assembly line and contribute a big Cost Savings.
In the standard shunt configuration, the combination of low temperature coefficient (T.C.), sharp turn-on characteristics, low output
impedance and programmable output voltage make this precision reference an excellent error amplifier.
The AS3431 is a direct replacement for the AS431 and TL431 in low voltage, low current applications. AS3431 is also available in
SOT-89 and TO-92.
ORDERING INFORMATION
TO-92
AS3431AN
AS3431N
SOT-23- 3-PIN
AS3431AM
AS3431M
SOT-89- 3-PIN
AS3431AM1
AS3431M1
TEMP RANGE
0°C to 105°C
0°C to 105°C
Output Accuracy
0.5%
1%
The AS3431AM is 0.5% tolerance and the marking on the pin should be “3431”
The AS3431M is 1% tolerance and the marking on the pin should be “3432”
PIN CONNECTIONS
SOT-23
Marking & pinout for
the 1% device
ANODE
TO-92 (N)
1
2
3
SOT-23
Marking & pinout for
the 0.5% device
ANODE
SOT-89
Marking &
pinout for all
devices
3431
CATHODE
ANODE
REF
CATHODE
REF
3432
1
3431
2
3
CATHODE
REF
CATHODE
ANODE
REF
Top View
Top View
Top View
Top View
Rev. 10/11/00
AS3431
CATHODE (K)
REFERENCE
(R)
+
-
2.5V
ABSOLUTE MAXIMUM RATINGS
Parameter
Cathode-Anode Reverse Breakdown
Anode-Cathode Forward Current
Operating Cathode Current
Reference Input Current
Continuous Power Dissipation at 25°C
SOT-23
Junction Temperature
Storage Temperature
Lead Temperature (Soldering 10 sec.)
Symbol
V
KA
I
AK
I
KA
I
REF
P
D
T
J
T
STG
T
L
ANODE (A)
Rating
18
1
100
1
300
150
- 65 to 150
300
Units
V
A
mA
mA
mW
°C
°C
°C
Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional
operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect reliability.
RECOMMENDED CONDITIONS
Parameter
Cathode Voltage
Cathode Current
Symbol
V
KA
1
K
Rating
V
REF
to 18
10
Unit
V
mA
TYPICAL THERMAL RESISTANCES
Package
SOT-23
SOT-89
TO-92
0
JA
575° C/W
575° C/W
575° C/W
0
JC
150° C/W
80° C/W
80° C/W
Typical Derating
1.7 mW/°C
9.1 mW/°C
6.3 mW/°C
Rev. 10/11/00
AS3431
ELECTRICAL CHARACTERISTICS
are guaranteed over full junction temperature range (0°C to 105°C). Ambient
temperature must be derated based on power dissipation and package thermal characteristics. The conditions are: V
