Data Sheet
LOW VOLTAGE (1.24V) ADJUSTABLE PRECISION SHUNT REGULATOR
AZ431L
General Description
The AZ431L 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
1.24V and 18V with two external resistors.
The AZ431L precision reference is offered in two
bandgap 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
1.24V 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 AZ431L
Dec. 2003 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
1
Data Sheet
LOW VOLTAGE (1.24V) ADJUSTABLE PRECISION SHUNT REGULATOR
AZ431L
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
2
3
4
REF
REF
ANODE CATHODE
Figure 2. Pin Configuration of AZ431L (Top View)
Functional Block Diagram
CATHODE
REF
+
-
V
REF
ANODE
Figure 3. Functional Block Diagram of AZ431L
Dec. 2003 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
2
Data Sheet
LOW VOLTAGE (1.24V) ADJUSTABLE PRECISION SHUNT REGULATOR
AZ431L
Ordering Information
Package
Temperature Range
TO-92
SOT-23-3
-40 to 125 C
SOT-23-5
SOT - 89
o
Voltage Tolerance
0.5%
1%
0.5%
1%
0.5%
1%
0.5%
1%
Part Number
AZ431LAZ
AZ431LBZ
AZ431LAN
AZ431LBN
AZ431LAK
AZ431LBK
AZ431LAR
AZ431LBR
Marking ID
AZ431LAZ
AZ431LBZ
N46
N47
K41
K42
R41A
R41B
Packing Type
Bulk
Ammo
Reel
Reel
Reel
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.
A Z 431L
X Y
Circuit Type
Bandgap Tolerance
A: 0.5%
B: 1%
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
TO-92
Package Thermal Impedance
Q
JA
SOT-23-3
SOT-23-5
SOT-89
770
370
130
330
250
100
o
Unit
V
mA
mA
mW
o
C
-65 to +150
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 Maxi-
mum Ratings" for extended periods may affect device reliability.
Dec. 2003 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
3
Data Sheet
LOW VOLTAGE (1.24V) ADJUSTABLE PRECISION SHUNT REGULATOR
AZ431L
Recommended Operating Conditions
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
V
REF
Conditions
V
KA
=V
REF,
I
KA
=10mA
0
o
C to 70
o
C
-40
o
C
to
85
o
C
Min
1.234
1.228
Typ
1.240
1.240
2
3
-0.5
0.15
Max
1.246
1.252
10
10
-1.5
0.4
mV/V
µ
A
Unit
V
mV
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
V
KA
=V
REF
I
KA
=10mA
∆
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
5
4
6
0.1
55
0.04
0.01
0.05
0.4
80
0.10
0.05
0.15
µ
A
µ
A
I
KA
V =V
(MIN)
KA REF
I
KA
V
REF
=0, V
KA
=18V
(OFF) V
KA
=6, V
REF
=0
V
KA
=V
REF
, I
KA
=1 to 100mA
Z
KA
f≤1.0kHz
µ
A
Ω
4
Dec. 2003 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
4
Data Sheet
LOW VOLTAGE (1.24V) ADJUSTABLE PRECISION SHUNT REGULATOR
AZ431L
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. 0
BCD Semiconductor Manufacturing Limited
5
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