AP1187 ANACHIP [Anachip Corp], AP1187 Datasheet

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AP1187

Manufacturer Part Number
AP1187
Description
1A Ultra Low Dropout Positive Adjustable Regulator
Manufacturer
ANACHIP [Anachip Corp]
Datasheet
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.
1A Ultra Low Dropout Positive Adjustable Regulator
Adjustable output voltage
0.6V Maximum Dropout voltage at 1.0A Load
Built-in Thermal Shutdown
Output Current Limiting
Fast transient response
Good noise rejection
Package: SOP-7L
PC Motherboard
LCD Monitor
Graphic Card
DVD-Video Player
NIC/Switch
Telecom Equipment
ADSL Modem
Printer and other Peripheral Equipment
current
Features
Applications
Pin Assignments
V
V
SENSE
ADJ
CTRL
V
IN
1
2
3
4
( Top View )
AP1187
SOP-7L
7
6
5
NC
V
V
OUT
IN
1/6
AP1187 is a 1A regulator with extremely low
dropout
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.
V
Name
V
V
ADJ
SENSE
NC
General Description
V
CTRL
Pin Descriptions
OUT
IN
voltage.
A resistor divider from this pin to the V
pin and ground sets the output voltage.
This pin is the positive side of the
reference
sensing
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.
This
to
that
Description
achieve
product
allows
Rev.1.1 Aug 23, 2005
AP1187
excellent
is
remote
specifically
load
load
OUT

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AP1187 Summary of contents

Page 1

... 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. General Description AP1187 regulator with extremely low dropout voltage. ...

Page 2

... P Power Dissipation D T Storage Temperature ST T Operating Junction Temperature Range OP NOTE1: AP1187-ADJ incorporates an internal thermal shutdown that protects the device when the junction temperature exceeds the allowable maximum junction temperature. Anachip Corp. www.anachip.com.tw AP 1187 Package Lead Free S7:SOP-7L Blank : Normal ...

Page 3

... V =0V, T =25 ADJ J =2.05V, I =1. =2.05 ADJ ADJ OUT SENSE V V OUT CTRL IN + AP1187 3/6 AP1187 150 C. Typical value refer Min. Typ. Max. Unit +1V 1.225 1.250 1.275 IN 0.2 1 1.5 1.7 0.5 0.6 1 0.01 0. 120 ...

Page 4

... This is summarized in the above equation. Since the minimum load current requirement of the AP1187 is 10mA typically selected 121Ω resistor so that it automatically satisfies this condition. Notice that since the I range of 50uA it only adds a small error to the ...

Page 5

... Ultra Low Dropout Positive Adjustable Regulator Function Description (Continued) Thermal Design The AP1187 incorporates an internal thermal shutdown that protects the device when the junction temperature exceeds the allowable maximum junction temperature. Although this device can operate with junction temperatures in the range of 150℃ ...

Page 6

... AP1187 e D Nom. Max. 0.236 0.244 0.154 0.157 0.152 0.155 0.192 0.194 0.066 0.070 0.016 0.019 0.050 0.054 0.009 0.010 0.041REF 0.027 0.035 0.057 0.061 o 7 Rev.1.1 Aug 23, 2005 ...

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