AME
AME431B-1.24V
n
General Description
The AME431B series ICs are 3-terminal adjustable
shunt regulator with guaranteed temperature stability over
a full operation range. These ICs feature sharp turn-on
characteristics, low temperature coefficient and low out-
put impendance, which make them ideal substitutes for
Zener diodes in applications such as switching power
supply, charger and other adjustable regulators.
The reference is set to 1.24V for AME431Bxxxxx12.
The output voltage can be set to 1.24V to 16V for
V
REF
=1.24V part type with two external resistors.
The AME431B precision reference is offered in two ref-
erence tolerance: 0.5% and 1.0%
The 5 main packages have low thermal impendance
which allows operation over a wide range of -40
o
C t o
+125
o
C.
Anode
Adjustable Precision
Shunt Regulator
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Functional Block Diagram
Cathode
REF
V
REF
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Features
l
Very Accurate Reference Voltage : 0.15% Typical
l
High Stability under Capacitive Load
l
Low Temperature Deviation: 4.5mV Typical
l
Low Equivalent Full-range Temperature Coefficient
with 20PPM/
o
C Typical
l
Low Dynamic Output Resistance: 0.2Ω Typical
l
Sink Current Capacity from 1mA to 100mA
l
Low Output Noise
l
Available in 7 Packages: TO-92, SOT-23, TSOT-23,
SOT-89, SOP-8 and SOT-25, TSOT-25
l
All AME’ s Lead Free Products Meet RoHS
Standards
n
Applications
l
Adjustable Power Supplies
l
Linear Regulators
l
Battery Operated Computer
l
Portable Electronics
l
l
l
l
l
Instrumentation
Switching Power Supply
Mother Board
LCD Monitor
Note Book Computer
Rev.E.04
1
AME
AME431B-1.24V
n
Typical Applications
Shunt Regulator
R3
V
IN
V
OUT
Adjustable Precision
Shunt Regulator
R1
V
REF
V
O
=(1+R1/R2) V
REF
AME431B
R2
High Current Shunt Regulator
R1
V
OUT
R4
R2
V
O
=(1+R2/R3) V
REF
V
REF
AME431B
R3
V
IN
Current Source or Current Limit
V
IN
R2
I
OUT
R1
I
OUT
=V
REF
/R2+I
KA
AME431B
2
Rev.E.04
AME
AME431B-1.24V
n
Typical Applications (contd.)
Precision 5V 1.5A Regulator
V
IN
R1
8.2K
AME1117
Adjust
R2
250
Adjustable Precision
Shunt Regulator
V
OUT
5V, 1.5A
AME431B
R3
250
Precision 5V 1.5A Regulator
R3
C1
R2
680
R5
R1
COMP
R4
V
OUT
U2
3
4
C2
Q1
2
AME431B
R6
PWM
Controller
VFB
PS521
Rev.E.04
3
AME
AME431B-1.24V
n
Pin Configuration
SOT-23
TSOT-23
Top View
3
Adjustable Precision
Shunt Regulator
SOT-23
TSOT-23
Top View
AME431BAJETXXXX
1. Cathode
2. REF
3
AME431BBJETXXXX
1. REF
2. Cathode
AME431B
3. Anode
* Die Attach:
AME431B
3. Anode
* Die Attach:
1
2
Conductive Epoxy
1
2
Conductive Epoxy
SOT-89
Top View
AME431BAJFTXXXX
1. REF
2. Anode
3. Cathode
1
2
3
SOT-25
TSOT-25
Top View
5
4
AME431BAJEVXXXX
1. NC
2. NC
AME431B
AME431B
3. Cathode
4. REF
5. Andode
* Die Attach:
Conductive Epoxy
1
2
3
* Die Attach:
Non-Conductive Epoxy
SOP-8
Top View
8
7
6
5
TO-92-3
Top View
AME431BAJHAXXXX
1. Cathode
2. Anode
AME431B
AME431BAJATXXXX
1. REF
2. Anode
3. Cathode
* Die Attach:
Conductive Epoxy
AME431B
3. Anode
4. NC
5. NC
6. Anode
1
2
3
4
7. Anode
8. REF
* Die Attach:
Conductive Epoxy
1
2
3
4
Rev.E.04
AME
AME431B-1.24V
n
Ordering Information
AME431B x x x x x xx x - x
Special Feature2
Special Feature1
Reference Voltage
Accuracy
Number of Pins
Package Type
Operating Ambient Temperature Range
Pin Configuration
Number
Reference
of
Accuracy
Voltage
Pins
Adjustable Precision
Shunt Regulator
Pin
Configuration
Operating Ambient
Temperature Range
Package
Type
Special
Feature1
Special Feature2
(For TO-92 Package Only)
Package Lead Pitch
A
(SOT-23)
(TSOT-23)
1. Cathode
2. REF
3. Anode
1. REF
2. Cathode
3. Anode
1. REF
2. Anode
3. Cathode
1. REF
2. Anode
3. Cathode
1. Cathode
2. Anode
3. Anode
4. NC
5. NC
6. Anode
7. Anode
8. REF
1. NC
2. NC
3. Cathode
4. REF
5. Anode
J: -40
O
C to +125
O
C
A:
E:
F:
H:
TO-92
SOT-2X
SOT-89
SOP
A: 8
T: 3
V: 5
A: 0.5%
B: 1.0%
12: 1.24V
L: Low profile
Y: Lead free &
Low profile
Z: Lead free
N/A:
1:
Taping
Bulk
5.08mm
2.54mm
B
(SOT-23)
(TSOT-23)
A
(SOT-89)
A
(TO-92-3)
A
(SOP-8)
A
(SOT-25)
(TSOT-25)
Rev.E.04
5
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