Page No. : 1/7
AX432 Series
Adjustable Shunt Regulator
AX432 Series Pin Assignment
3-Lead Plastic
SOT-23
Package Code: N
Pin 1: Reference
Pin 2: Cathode
Pin 3: Anode
3-Lead Plastic
SOT-89
Package Code: M
Pin 1: Reference
Pin 2: Anode
Pin 3: Cathode
3-Lead Plastic
TO-92
Package Code: A
Pin 1: Reference
Pin 2: Anode
Pin 3: Cathode
3
2
Description
The AX432 series are three-terminal adjustable regulators with
guaranteed thermal stability over applicable temperature ranges. The
output voltage may be set to any value between V
REF
(approximately 1.24
or 1.25 volts) and 30 volts with two external resistors. These devices have
a typical dynamic output impedance of 0.2Ω. Active output circuitry
provides a very sharp turn-on characteristic, making these devices
excellent replacement for zener diodes in many applications.
1
1
2
3
Features
•
Programmable output voltage
•
Temperature coefficient is 50ppm/
o
C typical
•
Temperature compensated for operation over full temperature range
•
Low output noise voltage
•
Fast turn on response
1
2
12
3
3
Ordering Information
Package
SOT-23
SOT-89
TO-92
V
REF
1.24V±2%
AX432AN
AX432AM
AX432AA
V
REF
1.24V±1%
AX432BN
AX432BM
AX432BA
V
REF
1.24V±0.5%
AX432CN
AX432CM
AX432CA
V
REF
1.25V±2%
AX432DN
AX432DM
AX432DA
V
REF
1.25V±1%
AX432EN
AX432EM
AX432EA
V
REF
1.25V±0.5%
AX432FN
AX432FM
AX432FA
Absolute Maximum Ratings
(Operating temperature range applies unless otherwise specified)
Characteristics
Cathode Voltage
Cathode Current Range (Continuous)
Reference Input Current Range
Power Dissipation
Operating Temperature Range
Junction Temperature
Storage Temperature Range
Symbol
V
KA
I
K
I
REF
P
D
T
opr
T
J
T
stg
Value
30
50
0.05~+10
SOT-23
280
SOT-89
770
TO-92
770
0~+70
150
-65~+150
Unit
V
mA
mA
mW
C
o
C
o
C
o
Operating Conditions
Characteristics
Cathode Voltage
Cathode Current Range (Continuous)
Symbol
V
KA
I
K
Min.
V
REF
1
Typ.
-
10
Max.
30
-
Unit
V
mA
AVANTICS - AX432 Series
Specification No.: 050308-FE0002
Page No. : 2/7
Functional Block Diagram & Symbol
Functional Block Diagram
Symbol
Cathode
Reference
V
REF
+
-
Cathode
Reference
Anode
Anode
Test Circuits
Fig 1. V
K
=V
REF
V
IN
I
REF
I
K
V
REF
R
2
V
REF
I
I
V
K
Fig 2. V
K
>V
REF
V
IN
R
1
I
I
V
K
I
REF
I
K
I
OFF
Fig 3. Off-State Current
V
IN
V
K
Note: V
K
=V
REF
(1+R
1
/R
2
)+I
REF
xR
1
Electrical Characteristics
(T
A
=25
o
C unless otherwise specified)
Characteristics
AX432AN/AM/AA
AX432BN/BM/BA
AX432CA/CM/CA
Reference Input
(Fig1)
Voltage
AX432DN/DM/DA
AX432EN/EM/EA
AX432FN/FM/FA
Deviation of Reference Input Voltage Over-
Temperature
(Fig1)
Symbol
Test Conditions
Min
1.215
1.228
1.234
1.225
1.238
1.244
-
-
-
-
-
-
-
Typ
1.24
1.24
1.24
1.25
1.25
1.25
4
-1.4
-1
1
0.4
0.4
0.1
Max
1.265
1.252
1.246
1.275
1.262
1.256
17
-2.7
-2
4
1.2
1
1
Unit
V
REF
V
K
=V
REF
, I
K
=10mA
V
V
REF(dev)
Ratio of Change in Reference Input Voltage to
∆V
REF
/
the Change in Cathode Voltage
(Fig2)
∆V
K
Reference Input Current
(Fig2)
Deviation of Reference Input Current Over
Full Temperature Range
(Fig2)
Minimum Cathode Current for Regulation
(Fig1)
Off-State Cathode Current
(Fig3)
I
REF
I
REF(dev)
I
K(min)
I
K(off)
V
K
=V
REF
, I
K
=10mA
T
min
≤T
a
≤T
max
I
K
=10mA,
∆V
K
=10V to V
REF
I
K
=10mA,
∆V
K
=30V to 10V
I
K
=10mA, R
1
=10kΩ,
R
2
=∞
I
K
=10mA, R
1
=10kΩ,
R
2
=∞, T
a
=Full Range
V
K
=V
REF
V
K
=30V, V
REF
=0
mV
mV/V
mV/V
uA
uA
mA
uA
AVANTICS - AX432 Series
Specification No.: 050308-FE0002
Page No. : 3/7
Characteristics Curve
Cathode Current & Cathode Voltage
20
15
Change in Reference Input Voltage
& Cathode Voltage
0
Change in Reference Input Voltage (mV)
-2
-4
-6
-8
-10
-12
-14
-16
-18
-20
0
10
20
Cathode Voltage (V)
30
40
10
Cathode Current (mA)
5
0
-5
-10
-15
-20
-25
-1
-0.5
0
0.5
Cathode Voltage (V)
1
1.5
V
K
=V
REF
, Ta=25 C
Test Circuit (Fig1)
o
Reference Input Voltage & Temperature
1.248
1.246
Reference Input Voltage (V)
1.244
1.242
1.24
1.238
1.236
1.234
-20
0
20
40
60
o
Temperature ( C)
80
100
120
V
K
=V
REF
, I
K
=10mA
Test Circuit (Fig1)
300
200
100
0
-100
-200
-300
-400
-1
Cathode Current & Cathode Voltage
Cathode Current (uA)
V
K
=V
REF
, Ta=25 C
Test Circuit (Fig1)
o
-0.5
0
0.5
Cathode Voltage (V)
1
1.5
Small Signal Voltage Amplification &
Frequency
60
50
Voltage Amplification (dB)
40
30
Vout
20
10
0
-10
100
+
10uF
6.8K
Ik
180
4.3K
5V
GND
1000
10000
100000
Frequency (Hz)
1000000
10000000
AVANTICS - AX432 Series
Specification No.: 050308-FE0002
Page No. : 4/7
Typical Application
Fig 4. Shunt Regulator
Fig 5. High Current Shunt Regulator
Vcc
R1
Vout
Vcc
R1
Vout
R2
R2
Vout=(1+R
1
/R
2
)V
REF
Vout=(1+R
1
/R
2
)V
REF
Fig 6. Output Control of a Three-Terminal Fixed
Regulator
AX7805
Fig 7. Series Pass Regulator
Vcc
IN
OUT
COMMON
Vout
R1
Vcc
R1
Vout
R2
R2
Vout=(1+R
1
/R
2
)V
REF
; V
out(min)
=V
REF
+5V
Vout=(1+R
1
/R
2
)V
REF
; V
out(min)
=V
REF
+V
BE
Fig 8. Current Limiter or Current Source
Fig 9. Constant Current Sink
Vcc
Vcc
RCL
Iout
Isink
Rs
Iout=V
REF
/R
CL
AVANTICS - AX432 Series
Isink=V
REF
/R
S
Specification No.: 050308-FE0002
Page No. : 5/7
SOT-89 Dimension
C
H
Marking:
Date Code
AX4 3 2
Control Code
Pb Free Mark
Pb-Free: "
.
"
(Note)
Normal: None
B
D
1
E
G
A
2
3
I
Note: Green label is used for pb-free packing
Pin Style: 1.Reference 2.Anode 3.Cathode
Material:
•
Lead solder plating: Sn60/Pb40 (Normal),
Sn/3.0Ag/0.5Cu or Pure-Tin (Pb-free)
•
Mold Compound: Epoxy resin family,
flammability solid burning class: UL94V-0
F
J
DIM
A
B
C
D
E
F
G
H
I
Min.
4.40
4.05
1.50
2.40
0.36
*1.50
*3.00
1.40
0.35
Max.
4.60
4.25
1.70
2.60
0.51
-
-
1.60
0.41
*: Typical, Unit: mm
3-Lead SOT-89 Plastic
Surface Mounted Package
AVANTICS Package Code: M
TO-92 Dimension
A
B
1
2
3
α
2
Marking:
Pb Free Mark
Pb-Free: "
.
"
(Note)
Normal: None
A X
4 3 2
A
α
3
Date Code
Control Code
C
Note: Green label is used for pb-free packing
D
Pin Style: 1.Reference 2.Anode 3.Cathode
Material:
•
Lead solder plating: Sn60/Pb40 (Normal),
Sn/3.0Ag/0.5Cu or Pure-Tin (Pb-free)
•
Mold Compound: Epoxy resin family,
flammability solid burning class: UL94V-0
DIM
A
B
C
D
E
F
G
H
I
α1
α2
α3
Min.
4.33
4.33
12.70
0.36
-
3.36
0.36
-
-
-
-
-
Max.
4.83
4.83
-
0.56
*1.27
3.76
0.56
*2.54
*1.27
*5°
*2°
*2°
H
I
E
F
G
*: Typical, Unit: mm
α
1
3-Lead TO-92 Plastic Package
AVANTICS Package Code: A
AVANTICS - AX432 Series
Specification No.: 050308-FE0002
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