LT3050 Series

1

3050fa

TYPICAL APPLICATION

DESCRIPTION

100mA, Linear Regulator

with Precision Current Limit

and Diagnostic Outputs

dropout voltage (LDO) linear regulators. The devices

supply 100mA of output current with a dropout voltage of

340mV. A 10nF bypass capacitor reduces output noise to

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 in fixed output voltages of

3.3V and 5V, and as an adjustable version 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

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.

1μF

12V

IN

FAULT

SHDN

GND

OUT

REF/BYP

LT3050-5

5V

2.2μF

0.1μF

10nF

3k

(ADC FULL SCALE = 3V)

TO μP ADC

0.1μF

11.3k

(THRESHOLD = 10mA)

10nF

1.15k

(THRESHOLD = 100mA)

120k

3050 TA01

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