LT3050

1

3050f

TYPICAL APPLICATION

DESCRIPTION

100mA, Low Noise

Linear Regulator With Precision Current

Limit And Diagnostic Functions

voltage (LDO) linear regulator. The device supplies 100mA

of output current with a dropout voltage of 340mV. A 10nF

10Hz to 100kHz bandwidth and soft-starts the reference.

The LT3050’s ±45V input voltage rating combined with its

precision current limit and diagnostic functions make the IC

an ideal choice for robust, high reliability applications.

AsingleresistorprogramstheLT3050’scurrentlimit,accurate

to ±5% over a wide input voltage and temperature range.

A single resistor programs the LT3050’s minimum output

currentmonitor,usefulfordetectingopen-circuitconditions.

The current monitor function sources a current equal to

1/100th of output current. A logic FAULT pin asserts low if

the LT3050 is in current limit, operating below its minimum

output current (open-circuit) or is in thermal shutdown.

The LT3050 optimizes stability and transient response

with low ESR ceramic capacitors, requiring a minimum

of 2.2μF. The LT3050 is available as an adjustable device

with an output voltage range down to the 0.6V reference.

The LT3050 is available in the thermally-enhanced 12-Lead

3mm × 2mm DFN and MSOP packages.

FEATURES

APPLICATIONS

Thermal Limit

(2.2μF minimum)

Reverse-Current Protection

1μF

12V

IN

FAULT

SHDN

GND

OUT

ADJ

REF/BYP

LT3050

5V

2.2μF

0.1μF

10nF

1%

442k

1%

60.4k

3k

(ADC FULL SCALE = 3V)

TO μP ADC

0.1μF

11.3k

(THRESHOLD = 10mA)

10nF

1.15k

(THRESHOLD = 100mA)

120k

3050 TA01

External Current Limit

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.

TEMPERATURE (°C)

105

100

101

102

103

104

98

99

3050 TA01a

95

96

97

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