LT3089

1

3089f

For more information www.linear.com/LT3089

TYPICAL APPLICATION

FEATURES

DESCRIPTION

800mA Single Resistor

Rugged Linear Regulator

with Monitors

The LT®3089 is an 800mA low dropout linear regulator

designed for ruggedindustrialapplications.Keyfeaturesof

the IC are the extended safe operating area (SOA), output

current monitor, temperature monitor and programmable

current limit. The LT3089 can be paralleled for higher

output current or heat spreading. The device withstands

reverseinputandreverseoutput-to-inputvoltageswithout

reverse current flow.

The LT3089’s precision 50µA reference current source

allows a single resistor to program output voltage to

any level between zero and 34.5V. The current reference

architecture enables load regulation to be independent of

output voltage. The LT3089 is stable with or without input

and output capacitors.

temperature output (1µA/°C) provide system monitor-

ing and debug capability. In addition, a single resistor

programs current limit.

Internal protection circuitry includes reverse-battery and

reverse-currentprotection,currentlimitingandthermallim-

iting.TheLT3089isofferedinthe12-lead4mm×4mmDFN

and 16-lead TSSOP (both with exposed pad for improved

thermal performance), and 7-lead DD-Pak power package.

Wide Safe Operating Area Supply

APPLICATIONS

n

Extended Safe Operating Area

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Maximum Output Current: 800mA

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Stable with or without Input/Output Capacitors

n

Wide Input Voltage Range: 1.2V to 36V

n

Single Resistor Sets Output Voltage

n

n

Junction Temperature Monitor: 1µA/°C

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Output Adjustable to 0V

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50µA SET Pin Current: 1% Initial Accuracy

n

n

Parallel Multiple Devices for Higher Current or

Heat Spreading

n

Programmable Current Limit

n

Reverse-Battery and Reverse-Current Protection

n

n

<0.001%/V Line Regulation Typical

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Available in Thermally-Enhanced 12-Lead 4mm ×

4mm DFN, 16-Lead TSSOP, and 7-Lead DD-Pak

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All Surface Mount Power Supply

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Rugged Industrial Power Supply

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Post Regulator for Switching Supplies

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Low Output Voltage Supply

n

Intrinsic Safety Applications

L

, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

SET Pin Current

3089 TA01a

IN

1k

4.12k

10µF*

*OPTIONAL

OUT

+

–

LT3089

1.5V

0.75A

499*

1k

1µA/°C

SET

30.1k

TEMP

50µA

TEMPERATURE (°C)

–75 –50 –25 0 25 50 75 100 125 150 175

49.5

49.6

49.7

49.8

49.9

50.0

50.1

50.2

50.3

50.4

50.5

3089 TA01b