AME, Inc.
AME4311
Low Voltage Shunt Regulator
n
General Description
The AME4311 is a low volatge version of the industry
standard 431 shunt regulator. The AME4311 reference is
set to 1.24 volts. The output voltage can be set to any
value between 1.24V and 8V with two external resistors.
(For factory set internal feedback resistors see the
AME4312.) When used with an optocoupler these de-
vices are ideal for isolated 3.3V switching supplies.
Analog Microelectronics offers this part in a TO-92 pack-
age as well as the space saving SOT-23 and SOT-25
packages.
For isolated switching power supplies requiring volt-
ages lower than 2.7V see the AME4315.
n
Functional Block Diagram
V+
REF
V
R
=1.24
n
Features
l
l
l
l
l
Small packages: SOT-23, SOT-25, TO-92
Low voltage operation, 1.24V
Tight voltage tolerance --- ±0.5%,±1.0%, ±1.5%
Wide operating current ------- 80µA to 15mA
Wide temperature range ----- -40
o
C to +85
o
C
o
GND
n
Pin Configuration
SOT-23
Top View
GND
l
Low temperature coefficient --100ppm/ C
(max)
l
Excellent transient response
SOT-25
Top View
GND
REF
n
Applications
l
l
l
l
l
l
l
Battery Operating Equipments
Adjustable Supplies
Switching Power Supplies
Error Amplifiers
Single Supply Amplifier
Monitors / VCR / TV
Personal Computers
REF
V+
V+
TO-92
Top View
V+ GND REF
1
AME, Inc.
AME4311
Low Voltage Shunt Regulator
n
Ordering Information
Part Number
AME4311EEAT
Marking
AME
4311
EEAT
yyww
AVVww
Output Voltage Tolerance Package
1.24
0.5%
TO-92
Temp. Range
- 40
o
C to + 85
o
C
AME4311EEET
1.24
0.5%
SOT-23
- 40
o
C to + 85
o
C
AME4311FEET
AVWww
1.24
1.0%
SOT-23
- 40
o
C to + 85
o
C
AME4311GEET
AVXww
1.24
1.5%
SOT-23
- 40
o
C to + 85
o
C
AME4311EEEV
AGFww
1.24
0.5%
SOT-25
- 40
o
C to + 85
o
C
Please consult AME sales office or authorized Rep./Distributor for other voltage accuracy and package type avail-
ability.
2
AME, Inc.
AME4311
Low Voltage Shunt Regulator
n
Absolute Maximum Ratings
Parameter
Supply Current
Maximum
20
Unit
mA
Caution: Stress above the listed absolute maximum rating may cause permanent damage to the device
n
Recommended Operating Conditions
Parameter
Supply Current
Ambient Temperature Range
Junction Temperature
Rating
100
µ
A ~ 15mA
-40 to +85
-40 to +125
Unit
o
C
C
o
n
Thermal Information
Parameter
SOT-23
Thermal Resistance
SOT-25
TO-92
Maximum Junction Temperature
Maximum Lead Temperature (10 Sec)
Maximum
325
325
180
150
300
Unit
o
C/W
o
C
C
o
3
AME, Inc.
AME4311
Low Voltage Shunt Regulator
n
Electrical Specifications
TA = 25
0
C, I
REF
=10mA unless otherwise specified
Parameter
Reference Voltage
(Test Circuit 1)
Ratio of Change in V
REF
to
Cathode Voltage
Reference Input Current
Off State Leakage
Minimum Current I
K
Reference Voltage Temp. Coeff.
Dynamic Output Impendance
Symbol
V
REF
0.5%
V
REF
1.0%
V
REF
1.5%
∆
V
REF
∆
V
K
I
REF
I
K (OFF)
I
MIN
V
REFTC
0
o
C < T
A
< 70
o
C
V
Z
= V
REF
, I
Z
= 0.1mA to 15mA,
Frequency = OHZ
Test Condition
T
A
=25
o
C, I
REF
= 10mA
T
A
=25
o
C, I
REF
= 10mA
T
A
=25
o
C, I
REF
= 10mA
V
KA
= 6V to 8V
(Test Circuit 2)
Test Circuit 2
V
REF
= 0V
V
K
= 7V
(Test Circuit 3)
80
100
0.3
0.4
1000
nA
µ
A
ppm/
o
C
Min
Typ
Max
Units
V
V
V
mV/V
µ
A
1.234 1.240 1.246
1.228 1.240 1.252
1.221 1.240 1.258
-2.7
0.3
1.0
r
Z
Ω
V
IN
V
KA
= V
REF
I
KA
=10mA
V
IN
V
KA
V
IN
V
KA
I
K(OFF)
R1
V
REF
R2
I
REF
I
K
Test Circuit 1
Test Circuit 2
Test Circuit 3
4
AME, Inc.
AME4311
Dynamic Impedance vs. Temperature
Dynamic Impedance 0.1-15mA (ohm)
0.33
0.31
0.29
0.27
0.25
0.23
0.21
0.19
0.17
0.15
-45
-5
25
55
85
Low Voltage Shunt Regulator
Reference Voltage vs. Temperature
Reference Voltage @ 10mA(V)
1.234
0.35
1.232
1.230
1.228
1.226
1.224
1.222
-45
-5
25
55
85
Temperature (
o
C)
Temperature
(
o
C)
Reference Input Current vs. Temperature
0.14
Line Transient Response, IK=10mA
Reference Input Current (uA)
0.12
V
IN
0.10
0.08
0.06
0.04
0.02
0.00
-45
1V / DIV
V
OUT
-5
25
55
85
CH1
1.00V
CH2
1.00V
M1.00µS
CH1
800mV
Temperature
(
o
C)
Frequency=100KHz
High Current Operating Characteristics
50
Low Current Operating Characteristics
1050
900
750
600
450
300
150
0
-150
-1.0
I
K
- Cathode Current (mA)
30
20
10
0
-10
-20
-30
-1.0
-0.5
0
0.5
1.0
1.5
I
K
- Cathode Current (µA)
µ
40
T=25
O
C
-0.5
0
0.5
1.0
1.5
V
KA
- Cathode Voltage (V)
V
KA
- Cathode Voltage (V)
5
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