Analog Microelectronics, Inc.
1A Low Dropout Positive
Voltage Regulator
AME1117
nGeneral Descriptions
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
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.
l Thermal protection
l Available in TO-220, TO-252, SOT-223
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
n Typical Application
Input
AME1117
GND
Current
Lim iting
Am plifier
10µF Tan
Load
4.75V to 12V
10 F Tan
µ
Therm al
Output
Protection
Input range depends on VOUT
Please refer to electrical characteristics.
Error
Am p.
ADJ/COM
Bandgap
Reference
Figure 2
Figure 1
1