Description
The AZ431-A series ICs are three-terminal adjustable
shunt regulators with guaranteed thermal stability over a
full operation range. These ICs feature sharp turn-on char-
acteristics, low temperature coefficient and low output
impedance, which make them ideal substitutes for Zener
diodes in applications such as switching power supply,
charger and other adjustable regulators.

The AZ431-A series ICs are of 40V voltage type. Its out-
put voltage can be set to any value between V
REF
(2.5V)
and 36V.
The AZ431-A precision reference is offered in two band-
gap tolerance: 0.4% and 0.8%.
Features
· Programmable Precise Output Voltage from 2.5V to
36V
· Very Accurate Reference Voltage: 0.15% Typical
· High Stability under Capacitive Load
· Low Temperature Deviation: 4.5mV Typical
· Low Equivalent Full-range Temperature Coefficient
with 20PPM/
o
C Typical
· Low Dynamic Output Resistance: 0.2Ω Typical
· Sink Current Capacity from 1mA to 100 mA
· Low Output Noise
· Wide Operating Range of -40 to 125
o
C
Applications
· Charger
· Voltage Adapter
· Switching Power Supply
· Graphic Card
· Precision Voltage Reference
Benefits
· Easier to Stabilize
· Ultra Low Temperature Coefficient
· Higher V
REF
Accuracy
· Wider Operating Temperature Range
· Very Competitive Price
Parametric Table
AZ431A-A AZ431B-A
I
KA
(Max) (mA)
100 100
I
KA
(Min) (mA)
0.4 0.4
V
OUT
/ V
REF
Initial
Tol. (%)
0.4 0.8
V
OUT
(Max) (V) 36 36
V
OUT
(Min) (V)
2.5 2.5
Z
KA
(Typ) (Ω) 0.15 0.15
Temp Coeff. (Typ)
(PPM/
o
C)
20 20
Operating Temperature
(Min) (
o
C)
-40 -40
Operating Temperature
(Max) (
o
C)
+125 +125
Additional Available Materials
· Samples
· Datasheet
· Reliability Report
· ESD Report
Nov. 2004 BCD Semiconductor Manufacturing Limited
Product Brief
ADJUSTABLE PRECISION SHUNT REGULATORS AZ431-A
Pin Configuration
SOT-23-3 SOT-89
ANODE
REF CATHODE
REF ANODE CATHODE
1 2 31 2
3