LOW DROPOUT

LOW DROPOUT

LOW DROPOUT

LOW DROPOUT

LOW DROPOUT

REGULA

REGULA

REGULA

REGULA

REGULAT

TT

T

TOR

OR

OR

OR

OR

AS1185

AustinSemiconductor,Inc.reservestherighttochangeproductsorspecificationswithoutnotice.

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AS1185

Rev. 1.1 6/05

Austin Semiconductor, Inc.

GENERAL DESCRIPTION

The AS1185 is a 2.7A low dropout regulator with adjustable

current limit and remote sense capability. It can be used as a

positive output regulator with floating input or as a standard

negative regulator with grounded input. The output voltage

range is 2.5V to 25V, with ±1% accuracy on the internal

reference voltage.

The AS1185 uses a saturation-limited NPN transistor as the

pass element. This device gives the linear dropout

characteristics of a FET pass element with significantly less die

area. High efficiency is maintained by using special

anti-saturation circuitry that adjusts base drive to track load

current. The “on resistance” is typically 0.25

Ω.

Accurate current limit is programmed with a single 1/8W

external resistor, with a range of zero to three amperes. A

second, fixed internal limit circuit prevents destructive currents

if the programming current is accidentally overranged.

Assembly considerations for this package requires that

the fixed internal current limit circuit be bypassed at all times.

An external current limit resistor set to a maximum of 2.7A

must be used. Failure to do so on this package can result in

damage to the device.

Shutdown of the regulator output is guaranteed when the

program current is less than 1µA, allowing external logic

control of output voltage.

FEATURES

• Low Resistance Pass Transistor: 0.25

Ω

• Dropout Voltage: 0.75V at 2.7A

• ±1% Reference Voltage

• Accurate Programmable Current Limit

• Shutdown Capability

• Internal Reference Available

• Standard 10-Lead Packages

• Full Remote Sense

• Low Quiescent Current:

≈ 2.5mA

• Good High Frequency Ripple Rejection

OPTIONS

MARKINGS

• Packages

10 Lead Ceramic Flatpack

F

AVAILABLE AS MILITARY

SPECIFICATIONS

• Military Equipment Screening - MIL-STD-883, 1.2.2

PIN ASSIGNMENT

(Top View)

10 Lead Flat Pack (F)

Low Dropout Regulator

For more products and information

please visit our web site at

www.austinsemiconductor.com

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10

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GND

FB

V

IN

V

REF

V

IN

GND

V

OUT

NC

V

OUT

NC

AS1185

5V, 2.7A Regulator with 2.7A current limit

5.6K