Data Sheet
LOW VOLTAGE (1.25V) ADJUSTABLE PRECISION SHUNT REGULATOR
AZ432
General Description
The AZ432 series ICs are low voltage three-terminal
adjustable regulators with guaranteed thermal stability
over a full operation range. These ICs feature sharp
turn-on characteristics, low temperature coefficient
and low output impedance, which make them ideal
substitutes for Zener diodes in applications such as
switching power supply, charger, motherboard and
other adjustable regulators.
The output voltage can be set to any value between
1.25V and 18V with two external resistors.
The AZ432 precision reference is offered in two band-
gap tolerance: 0.5% and 1%.
These ICs are available in 4 packages: TO-92, SOT-
23-3, SOT-23-5, SOT-89.
Features
·
·
·
·
·
·
·
·
Wide Programmable Precise Output Voltage from
1.25V to 18V
High Stability under Capacitive Load
Low Temperature Deviation: 3mV Typical
Low Equivalent Full-Range Temperature Coeffi-
cient: 20PPM/
o
C Typical
Low Dynamic Output resistance: 0.05Ω Typical
High Sink Current Capacity from 55µA to 100
mA
Low Output Noise
Wide Operating Range of -40 to 125
o
C
Applications
·
·
·
·
·
Graphic Card
PC Motherboard
Voltage Adapter
Switching Power Supply
Charger
SOT-23-5
SOT-23-3
TO-92
SOT-89
Figure 1. Package Types of AZ432
Dec. 2003 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
1
Data Sheet
LOW VOLTAGE (1.25V) ADJUSTABLE PRECISION SHUNT REGULATOR
AZ432
Pin Configuration
Z Package
(TO-92)
N Package
(SOT-23-3)
ANODE
K Package
(SOT-23-5)
R Package
(SOT-89)
3 CATHODE
2 ANODE
1 REF
REF
1
3
2
NC
NC
CATHODE
CATHODE
1
2
3
5
ANODE
1
4
REF
REF
2
3
ANODE CATHODE
Figure 2. Pin Configuration of AZ432 (Top View)
Functional Block Diagram
CATHODE
REF
+
-
V
REF
ANODE
Figure 3. Functional Block Diagram of AZ432
Dec. 2003 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
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Data Sheet
LOW VOLTAGE (1.25V) ADJUSTABLE PRECISION SHUNT REGULATOR
AZ432
Ordering Information
Package
Temperature Range
Voltage Tolerance
0.5%
1%
0.5%
1%
0.5%
1%
0.5%
1%
Part Number
AZ432AZ
AZ432BZ
AZ432AN
AZ432BN
AZ432AK
AZ432BK
AZ432AR
AZ432BR
Marking ID
AZ432AZ
AZ432BZ
N48
N49
K43
K44
R42A
R42B
Packing Type
Bulk
Ammo
Reel
Reel
Reel
TO-92
SOT-23-3
SOT-23-5
SOT - 89
-40 to 125
o
C
Some of our products are available in Lead Free packages; If buyers need Lead Free product, please add -E1 after
the part number in your order. For example, AZ358M is a standard tin-lead product, AZ358M-E1 means a Lead
Free product.
AZ432
X
Circuit Type
Bandgap Tolerance
A: 0.5%
B: 1%
Y
Package
Z: TO-92
N: SOT-23-3
K: SOT-23-5
R: SOT-89
Absolute Maximum Ratings (Note 1)
Parameter
Cathode Voltage
Cathode Current Range (Continuous)
Reference Input Current Range
Power Dissipation
Storage Temperature Range
Symbol
V
KA
I
KA
I
REF
P
D
T
STG
Value
20
-100 to 100
10
Z,R Package
N,K Package
-65 to 150
TO-92
Package Thermal Impedance
Q
JA
SOT-23-3
SOT-23-5
SOT-89
130
330
250
100
o
Unit
V
mA
mA
770
370
mW
o
C
C/W
Note 1: 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 Max-
imum Ratings" for extended periods may affect device reliability.
Dec. 2003 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
3
Data Sheet
LOW VOLTAGE (1.25V) ADJUSTABLE PRECISION SHUNT REGULATOR
AZ432
Recommended Operation Ratings
Parameter
Cathode Voltage
Cathode Current
Operating Ambient Temperature Range
Symbol
V
KA
I
KA
Min
V
REF
0.1
-40
Max
18
100
125
Unit
V
mA
o
C
Electrical Characteristics
(Typical and limits apply for T
J
=25
o
C unless otherwise noted.)
Parameter
Reference Voltage
0.5%
1%
Test
Symbol
Circuit
4
4
5
5
5
4
Conditions
Min
1.244
1.238
Typ
1.250
1.250
2
3
-0.5
0.15
Max
1.256
1.262
10
10
-1.5
0.4
mV/V
µ
A
µ
A
µ
A
µ
A
Ω
Unit
V
mV
V
REF
V
KA
=V
REF,
I
KA
=10mA
∆
V
REF
V
KA
=V
REF
I
KA
=10mA
0 to 70
o
C
-40 to 85
o
C
Deviation of Reference Voltage
Over-Temperature
Ratio of Change in V
REF
to the
Change in Cathode Voltage
Reference Input Current
Deviation of Reference Current
Over Full Temperature Range
Minimum Cathode Current for
Regulation
Off-State Cathode
Current
Dynamic Impedance
∆
V
REF
I =10mA,
∆Vz:
V
KA
REF
to 16V
∆
V
KA
I
REF
∆I
REF
I
KA
=10mA, R1=10KΩ, R2=∞
I
KA
=10mA, R1=10KΩ, R2=∞
T
A
=-40 to 85
o
C
0.1
55
0.04
0.01
0.05
0.4
80
0.10
0.05
0.15
I
KA
V =V
(MIN)
KA REF
I
KA
V
REF
=0, V
KA
=18V
(OFF) V
KA
=6V, V
REF
=0
Z
KA
V
KA
=V
REF
, I
KA
=1 to 100mA
f≤1.0kHz
6
4
Dec. 2003 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
4
Data Sheet
LOW VOLTAGE (1.25V) ADJUSTABLE PRECISION SHUNT REGULATOR
AZ432
Electrical Characteristics (Continued)
R1
V
IN
I
KA
V
KA
V
REF
Figure 4. Test Circuit 4 for V
KA
=V
REF
R3
V
IN
I
KA
R1
I
REF
V
KA
=V
REF
(1+R1/R2)+ I
REF
R1
R2
V
REF
V
KA
Figure 5. Test Circuit 5 for V
KA
>V
REF
V
IN
I
OFF
V
KA
Figure 6. Test Circuit 6 for I
OFF
Dec. 2003 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
5
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