Analog Microelectronics, Inc.
1
AME1085
3A Low Dropout
Positive Voltage Regulator
n Applications
l High Efficiency Linear Regulators
l Post Regulators for Switching Supplies
l 5V to 3.3V Voltage Converter
l Battery Charger
n Functional Block Diagram
Thermal
Protection
Bandgap
Reference
Current
Limiting
Amplifier
Input
Output
ADJ/GND
Error
Amp.
n General Description
The AME1085 is a 3A low-dropout positive voltage regu-
lator. It is available in fixed and adjustable output voltage
versions. Overcurrent and thermal protection are inte-
grated onto the chip. Output current will limit as it reaches
the pre-set current or temperature limit. At full rated
output current the dropout voltage is 1.4V (max.).
AME1085 series regulators provide excellent regulation
over line, load and temperature variations.
n Key Features
l Low dropout voltage 1.2V typically at 3A
l Adjustable or 3.3V fixed voltage
l Line regulation typically 0.015%
l Load regulation typically 0.05%
l Adjust pin (ADJ) current less than 90υA
l Overcurrent protection
l Thermal protection
l Available in TO-220, TO-263, TO-252
Figure 1
n Typical Application
Figure 2
AME1085
Load
10µF Tan10µF Tan4.75V to 5.25V
V
IN
GND
V
OUT