Analog Microelectronics, Inc.
1
AME1117
1A Low Dropout Positive
Voltage Regulator
n Typical Application
nGeneral Descriptions
The AME1117 is a 1A low-dropout positive voltage regu-
lator. It is available in fixed and adjustable output
voltage versions. Overcurrent and thermal protection
are integrated onto the chip. Output current will limit
as while it reaches the pre-set current or temperature
limit. The dropout voltage is specified at 1.4V Maxi-
mum at full rated output current. The AME1117 series
provides excellent regulation over line, load and tem-
perature variations.
nApplications
l High Efficiency Linear Regulators
l 5V to 3.3V Voltage Converter
l Battery Charger
l Post Regulators for Switching Supplies
nFunctional Block Diagram
Figure 1
nKey Features
l Low dropout voltage ..............1.2V at 1A
l Adjustable or fixed voltages 2.5V, 3.3V, 5.0V
l Typical line regulation ....... 0.2%
l Typical load regulation ...... 0.15%
l Adjust pin current less than 90µA
l Overcurrent protection
l Thermal protection
l Available in TO-220, TO-252, SOT-223
Input range depends on V
OUT
Please refer to electrical characteristics.
Figure 2
Thermal
Protection
Bandgap
Reference
Current
Limiting
Amplifier
Input
Output
ADJ/COM
Error
Amp.
10µF Tan4.75V to 12V Load10µF Tan
AME1117
GND