Diodes AZ432 User Manual
AZ432
Document number: DS36803 Rev. 3 - 2
1 of 18
www.diodes.com
January 2014
© Diodes Incorporated
AZ432
A Product Line of
Diodes Incorporated
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/oC
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 +125oC
Applications
Graphic Card
PC Motherboard
Voltage Adapter
Switching Power Supply
Charger
1
2
3
CATHODE
ANODE
REF
CATHODE
ANODE
REF
3
2
1
CATHODE
ANODE
REF
1
2
3
LOW VOLTAGE (1.25V) ADJUSTABLE PRECISION SHUNT REGULATOR
Pin Assignments
(Top View) (Top View) (Top View)
(TO-92 (Bulk Packing)/ Z Package) (TO-92 (Ammo Packing)/ Z Package) (SOT-23/ N Package)
AZ432
Document number: DS36803 Rev. 3 - 2
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January 2014
© Diodes Incorporated
AZ432
A Product Line of
Diodes Incorporated
V
IN
V
OUT
R1
R2
V
REF
AZ432
R3
V
IN
V
OUT
R4
R1
R2
V
REF
R3
AZ432
CATHODE
ANODE
REF
1
2
3
4
5NC
*
(Note 1)
V
OUT
= (1+R1/R2)*V
REF
V
OUT
= (1+R2/R3)*V
REF
1 2 3
REF ANODE CATHODE
1 2
3
REF ANODE CATHODE
Pin Assignments (Cont.)
(Top View) (Top View) (Top View)
Note 1: *Pin 2 is attached to substrate and must be connected to ANODE or open.
(SOT-23-5/ K Package) (SOT-89 (Option 1/ R Package) (SOT-89 (Option 2/ R Package)
Typical Applications Circuit
Shunt Regulator
High Current Shunt Regulator
AZ432
Document number: DS36803 Rev. 3 - 2
3 of 18
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January 2014
© Diodes Incorporated
AZ432
A Product Line of
Diodes Incorporated
I
OUT
V
IN
AZ432
R2
R1
AZ1117V
IN
2.5V/1A
8.2K
AZ432
R1
R2
R3
250
250
PWM Controller
C1
R1
R2 680
U2
3
4
PS521
C2
2
R3
R4
R5
V
OUT
AZ432
Q1
COMP
VFB
I
OUT
= V
REF
/R2+ I
KA
Typical Applications Circuit (Cont.)
Current Source or Current Limit
Precision 2.5V/1A Regulator
PWM Converter with Reference
AZ432
Document number: DS36803 Rev. 3 - 2
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© Diodes Incorporated
AZ432
A Product Line of
Diodes Incorporated
Symbol
Parameter
Rating
Unit
VKA
Cathode Voltage
20
V
I
KA
Cathode Current Range (Continuous)
-100 to 100
mA
I
REF
Reference Input Current Range
10
mA
P
D
Power Dissipation
Z, R Package
770
mW
N, K Package
370
TJ
Junction Temperature
+150
ºC
T
STG
Storage Temperature Range
-65 to +150
ºC
Symbol
Parameter
Min
Max
Unit
V
KA
Cathode Voltage
V
REF
18 V I
KA
Cathode Current
0.1
100
mA
–
Operating Ambient Temperature Range
-40
+125
ºC
Functional Block Diagram
Absolute Maximum Ratings (Note 2)
Note 2: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stres s ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “Recommended O perating Conditions” is not implied. Exposure to
“Absolute Maximum Ratings” for extended periods may affect device reliability.
Recommended Operating Conditions
AZ432
Document number: DS36803 Rev. 3 - 2
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January 2014
© Diodes Incorporated
AZ432
A Product Line of
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Symbol
Parameter
Test
Circuit
Conditions
Min
Typ
Max
Unit
V
REF
Reference Voltage
0.5%
4
V
KA
= V
REF
, I
KA
= 10mA
1.244
1.250
1.256
V
1.0%
1.238
1.250
1.262
∆V
REF
Deviation of Reference Voltage
Over Full Temperature Range
4
V
KA
= V
REF
,
I
KA
= 10mA
0 to +70°C
– 2 10
mV
-40 to +85°C
– 3 10
-40 to +125°C
– 4 15
∆V
REF
∆VKA
Ratio of Change in V
REF
to the
Change in Cathode Voltage
5
I
KA
= 10mA,
∆VKA: V
REF
to 16V
–
-0.5
-1.5
mV/V
I
REF
Reference Input Current
5
I
KA
= 10mA, R1 = 10KΩ, R2 = ∞
–
0.15
0.4
µA
∆I
REF
Deviation of Reference Current
Over Full Temperature Range
5
I
KA
= 10mA, R1 = 10KΩ, R2 = ∞,
TA = -40 to +125°C
–
0.1
0.4
µA
I
KA
(Min)
Minimum Cathode Current for
Regulation
4
V
KA
= V
REF
–
55
80
µA
I
KA
(Off)
Off-state Cathode Current
6
V
REF
= 0, V
KA
= 18V
–
0.04
0.10
µA
V
KA
= 6V, V
REF
= 0
–
0.01
0.05
Z
KA
Dynamic Impedance
4
V
KA
= V
REF
, IKA = 1 to 100mA,
f ≤ 1.0KHz
–
0.05
0.15
Ω
θ
JC
Thermal Resistance
(Junction to Case)
–
SOT-23
–
84.84
–
°C/W
SOT-23-5
–
84.84
–
TO-92
–
140.80
–
SOT-89
–
29.80
–
Electrical Characteristics (Typical and limits apply for T
= +25 ºC, unless otherwise noted.)
A
AZ432
Document number: DS36803 Rev. 3 - 2
6 of 18
www.diodes.com
January 2014
© Diodes Incorporated
AZ432
A Product Line of
Diodes Incorporated
Electrical Characteristics (Cont.)
Test Circuit 4 for V
KA
= V
REF
Test Circuit 5 for V
Test Circuit 6 for I
> V
REF
KA
OFF
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