Austin Semiconductor, Inc.
Low Dropout Regulator
AVAILABLE AS MILITARY
SPECIFICATIONS
• Military Equipment Screening - MIL-STD-883, 1.2.2
LOW DROPOUT
REGULAT
REGULATOR
AS1185
(Top View)
PIN ASSIGNMENT
10 Lead Flat Pack (F)
GND
FB
V
IN
V
REF
V
IN
1
2
3
4
5
10
9
8
7
6
GND
V
OUT
NC
V
OUT
NC
FEATURES
• Low Resistance Pass Transistor: 0.25Ω
• 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
• Packages
10 Lead Ceramic Flatpack
MARKINGS
F
5V, 2.7A Regulator with 2.7A current limit
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 0.25Ω.
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.
5.6K
AS1185
For more products and information
please visit our web site at
www.austinsemiconductor.com
AS1185
Rev. 1.1 6/05
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
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