LT1185 LINER [Linear Technology], LT1185 Datasheet

LT1185

Manufacturer Part Number

LT1185

Description

Low Dropout Regulator

Manufacturer

LINER [Linear Technology]

Datasheet

1.LT1185.pdf (16 pages)

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Current page: 1 of 16
Download datasheet (215Kb)

The LT

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.

TYPICAL

6V TO 16V

FEATURE

–

ESCRIPTIO

Low Resistance Pass Transistor: 0.25

Dropout Voltage: 0.75V at 3A

Accurate Programmable Current Limit

Shutdown Capability

Internal Reference Available

Standard 5-Lead Packages

Full Remote Sense

Low Quiescent Current: 2.5mA

Good High Frequency Ripple Rejection

1% Reference Voltage

*CURRENT LIMIT = 15k/R

1185 is a 3A low dropout regulator with adjustable

5V, 3A Regulator with 3.5A Current Limit

2 F

TANT

PPLICATI

REF

4.3k

LIM

LT1185

= 3.5A

GND

OUT

2.37k

2.67k

2 F

TANT

LT1185 • TA01

5V AT 3A

OUT

–

The LT1185 uses a saturation-limited NPN transistor as

the pass element. This device gives the linear dropout

characteristics of an 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 .

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 over-

ranged. Shutdown of the regulator output is guaranteed

when the program current is less than 1 A, allowing

external logic control of output voltage.

The LT1185 has all the protection features of previous LTC

regulators, including power limiting and thermal shut-

down. The 4-lead TO-3 package is specified for –55 C to

150 C operation and the 5-lead TO-220 is specified over

0 C to 125 C.

, LTC and LT are registered trademarks of Linear Technology Corporation.

Low Dropout Regulator

1.6

1.2

1.0

0.6

1.4

0.8

0.4

0.2

Dropout Voltage

LOAD CURRENT (A)

= 125 C

= 25 C

= –55 C

LT1185 • TA02

LT1185

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