AP1187
1A Ultra Low Dropout Positive Adjustable Regulator
Features
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General Description
AP1187 is a 1A regulator with extremely low
dropout voltage. This product is specifically
designed to provide well regulated supply for
applications requiring 2.8V or lower voltages from
3.3V ATX power supplies where high efficiency of a
switcher can be achieved without the cost and
complexity associated with switching regulator. One
such application is the new graphic chip sets that
require anywhere from 2.4V to 2.7V supply.
Adjustable output voltage
0.6V Maximum Dropout voltage at 1.0A Load
current
Built-in Thermal Shutdown
Output Current Limiting
Fast transient response
Good noise rejection
Package: SOP-7L
Applications
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PC Motherboard
LCD Monitor
Graphic Card
DVD-Video Player
NIC/Switch
Telecom Equipment
ADSL Modem
Printer and other Peripheral Equipment
Pin Assignments
Pin Descriptions
Name
ADJ
Description
A resistor divider from this pin to the V
OUT
pin and ground sets the output voltage.
This pin is the positive side of the
reference that allows remote load
sensing to achieve excellent load
regulation. A minimum of 10uF capacitor
must be connected from this pin to
ground to insure stability.
The input of the regulator.
This pin is the supply pin for the internal
control circuit as well as the base drive
for the pass transistor.
Not used.
The output of the regulator.
( Top View )
ADJ 1
V
SENSE
2
AP1187
V
IN
3
V
CTRL
4
SOP-7L
7 NC
6 V
OUT
V
SENSE
5 V
IN
V
IN
V
CTRL
NC
V
OUT
This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of
this product. No rights under any patent accompany the sale of the product.
Rev.1.1
1/6
Aug 23, 2005
ANACHIP [ ANACHIP CORP ]
