AQ112
Ultra-Low Dropout
1A Voltage Regulator
Product Specification
Revision 1.6
September 13, 2006
General Description
The AQ112 is an ultra-low dropout three terminal
voltage regulator, offered in popular fixed options
or an adjustable version that can set a precise
voltage from 1.22V to 12V with two external
resistors.
It drops into the footprint of the popular LM1117
SOT-223 and provides a true 4
th
pin separated
from the output tab which allows a separate bias
connection from the pass transistor in order to
achieve
enable
and
ultra low dropout
from V
IN
to V
OUT
.
The
enable
pin provides a remote turn-off for low
power consumption. It draws virtually zero current
in shutdown mode and implements Sequential,
Ratiometric,
or
Simultaneous
sequencing
schemes.
To assure accuracy within 1%, the heart of the
AQ112 is a self-correcting AcuRef™ bandgap
reference.
On-chip current limit and thermal shutdown with
hysteresis protects against any combination of
overload and ambient temperature that might
cause the junction temperature to exceed safe
limits.
Applications
•
Graphic cards
•
PC motherboards
•
Switching power supply post-regulation
•
Telecom equipment
•
DVD video player
Features
•
Ultra Low Dropout (400mV at 1A)
•
Enable pin implements sequencing
•
Vout tolerance less than
1.5%
over
•
•
•
•
•
•
temperature
Stable with low cost 1uF capacitor
Thermal protection with hysteresis
Short circuit protection
Adjustable output
The AQ112 is featured in the new
SOT223 4-lead
TetraPack
TM
package.
RoHS compliant
available
Typical Application
www.acutechnology.com
AQ112
ACUTECH [ ACUTECHNOLOGY SEMICONDUCTOR ]
