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LT3082

3082f

TYPICAL APPLICATIONS

DAC-Controlled Regulator

Two-Level Regulator

Protection Features

The LT3082 incorporates several protection features ideal

for battery-powered circuits, among other applications. In

addition to normal monolithic regulator protection features

such as current limiting and thermal limiting, the LT3082

protects itself against reverse-input voltages, reverse-

output voltages, and reverse OUT-to-SET pin voltages.

Current limit protection and thermal overload protection

protect the IC against output current overload conditions.

For normal operation, do not exceed a junction temperature

of 125°C. The thermal shutdown circuit’s temperature

threshold is typically 165°C and incorporates about 5°C

of hysteresis.

The LT3082’s IN pin withstands ±40V voltages with respect

to the OUT and SET pins. Reverse current ﬂow, if OUT is

greater than IN, is less than 1mA (typically under 100μA),

protecting the LT3082 and sensitive loads.

Clamping diodes and 1k limiting resistors protect the

LT3082’s SET pin relative to the OUT pin voltage. These

protection components typically only carry current under

transient overload conditions. These devices are sized to

handle ±10V differential voltages and ±15mA crosspin

current ﬂow without concern. Relative to these application

concerns, note the following two scenarios. The ﬁrst sce-

nario employs a noise-reducing SET pin bypass capacitor

while OUT is instantaneously shorted to GND. The second

scenario follows improper shutdown techniques in which

the SET pin is reset to GND quickly while OUT is held up

by a large output capacitance with light load. The Typical

Applications section shows simple, robust techniques for

shutting down SET and OUT together.

APPLICATIONS INFORMATION

–

SET

–

LT3082

10μA

OUT

VIN

VOUT

3082 TA02

GAIN = 4

LT1991

4.7μF

150k

450k

LTC2641

SPI

SET

–

LT3082

10μA

OUT

VIN

VOUT

3082 TA03

VN2222LL

2.2μF

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