AP1187
1A Ultra Low Dropout Positive Adjustable Regulator
Features
General Description
• Adjustable output voltage
• 0.6V Maximum Dropout voltage at 1.0A Load
current
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.
• Built-in Thermal Shutdown
• Output Current Limiting
• Fast transient response
• Good noise rejection
• Package: SOP-7L
Applications
• 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
Description
( Top View )
A resistor divider from this pin to the VOUT
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.
ADJ
ADJ
VSENSE
VIN
7 NC
1
2
3
4
VSENSE
VOUT
6
5
AP1187
SOP-7L
VIN
The input of the regulator.
VCTRL
VIN
This pin is the supply pin for the internal
VCTRL control circuit as well as the base drive
for the pass transistor.
NC
VOUT
Not used.
The output of the regulator.
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 Aug 23, 2005
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