AME, Inc.
AME4311
Low Voltage Shunt Regulator
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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.
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Functional Block Diagram
V+
REF
V
R
=1.24
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Features
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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
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Pin Configuration
SOT-23
Top View
GND
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Low temperature coefficient --100ppm/ C
(max)
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Excellent transient response
SOT-25
Top View
GND
REF
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Applications
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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 [ ANALOG MICROELECTRONICS ]
