NOT RECOMMENDED FOR NEW DESIGN -
NO ALTERNATE PART
AZ432
LOW VOLTAGE (1.25V) ADJUSTABLE PRECISION SHUNT REGULATOR
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 voltage tolerance:
0.5% and 1.0%.
These ICs are available in 4 packages: TO-92 (bulk or ammo
packing), SOT-23, SOT-23-5 and 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 Coefficient: 20PPM/°
C
Typical
Low Dynamic Output Resistance: 0.05Ω Typical
High Sink Current Capacity from 0.1mA to 100mA
Low Output Noise
Wide Operating Range of -40 to +125°
C
Applications
Graphic Card
PC Motherboard
Voltage Adapter
Switching Power Supply
Charger
Pin Assignments
(Top View)
(Top View)
(Top View)
ANODE
3
2
CATHODE
ANODE
3
CATHODE
ANODE
REF
3
2
1
REF
1
1
REF
2
CATHODE
SOT-23
TO-92 (Bulk Packing)
TO-92 (Ammo Packing)
(Top View)
(Top View)
(Top View)
NC
*
1
2
3
5
ANODE
(Note 1)
CATHODE
4
REF
1
2
3
1
2
3
REF ANODE CATHODE
SOT-23-5
Note 1:
REF ANODE CATHODE
SOT-89 (Option 2)
SOT-89 (Option 1)
*Pin 2 is attached to substrate and must be connected to ANODE or open.
AZ432
Document number: DS36803 Rev. 4 - 3
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December 2018
© Diodes Incorporated
NOT RECOMMENDED FOR NEW DESIGN -
NO ALTERNATE PART
AZ432
Typical Applications Circuit
R3
V
IN
R1
V
OUT
= (1+R1/R2)*V
REF
V
OUT
V
REF
R2
AZ432
Shunt Regulator
V
IN
R1
R4
R2
V
OUT
V
OUT
= (1+R2/R3)*V
REF
V
REF
AZ432
R3
High Current Shunt Regulator
R2
V
IN
I
OUT
R1
I
OUT
= V
REF
/R2+ I
KA
AZ432
Current Source or Current Limit
AZ432
Document number: DS36803 Rev. 4 - 3
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December 2018
© Diodes Incorporated
NOT RECOMMENDED FOR NEW DESIGN -
NO ALTERNATE PART
AZ432
Typical Applications Circuit
(Cont.)
V
IN
R1
8.2K
AZ1117
2.5V/1A
R2
250
AZ432
R3
250
Precision 2.5V/1A Regulator
C1
R2 680
R5
R1
3
R3
R4
V
OUT
U2
C2
Q1
2
AZ432
COMP
PWM Controller
VFB
4
PS521
PWM Converter with Reference
AZ432
Document number: DS36803 Rev. 4 - 3
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December 2018
© Diodes Incorporated
NOT RECOMMENDED FOR NEW DESIGN -
NO ALTERNATE PART
AZ432
Functional Block Diagram
Absolute Maximum Ratings
(Note 2)
Symbol
V
KA
I
KA
I
REF
Parameter
Cathode Voltage
Cathode Current Range (Continuous)
Reference Input Current Range
Z, R Package
P
D
Power Dissipation
N, K Package
T
J
T
STG
Note 2:
Rating
20
-100 to 100
10
770
Unit
V
mA
mA
mW
370
°
C
°
C
Junction Temperature
Storage Temperature Range
+150
-65 to +150
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
—
Parameter
Cathode Voltage
Cathode Current
Operating Ambient Temperature Range
Min
V
REF
0.1
-40
Max
18
100
+125
Unit
V
mA
°
C
AZ432
Document number: DS36803 Rev. 4 - 3
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December 2018
© Diodes Incorporated
NOT RECOMMENDED FOR NEW DESIGN -
NO ALTERNATE PART
AZ432
Electrical Characteristics
(Typical and limits apply for T
A
= +25° unless otherwise noted.)
C,
Symbol
Parameter
0.5%
V
REF
Reference Voltage
1.0%
0 to +70°
C
∆V
REF
Deviation of Reference Voltage
Over Full Temperature Range
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
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
5
5
5
4
I
KA
= 10mA,
∆V
KA
: V
REF
to 16V
I
KA
= 10mA, R1 = 10kΩ, R2 = ∞
I
KA
= 10mA, R1 = 10kΩ, R2 = ∞,
T
A
= -40 to +125°
C
V
KA
= V
REF
V
REF
= 0, V
KA
= 18V
6
V
KA
= 6V, V
REF
= 0
Dynamic Impedance
4
V
KA
= V
REF
, I
KA
= 1 to 100mA,
f ≤ 1.0kHz
SOT-23
Thermal Resistance
(Junction to Case)
SOT-23-5
—
TO-92
SOT-89
—
—
140.80
29.80
—
—
—
—
—
—
0.01
0.05
84.84
84.84
0.05
0.15
—
—
°
C/W
Ω
4
V
KA
= V
REF
, I
KA
= 10mA
1.238
—
—
—
—
—
—
—
—
1.250
2
3
4
-0.5
0.15
0.1
55
0.04
1.262
10
10
15
-1.5
0.4
0.4
80
0.10
µA
mV/V
µA
µA
µA
mV
Test
Circuit
Conditions
Min
1.244
Typ
1.250
Max
1.256
V
Unit
θ
JC
AZ432
Document number: DS36803 Rev. 4 - 3
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December 2018
© Diodes Incorporated
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