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LT3088

3088fb

For more information www.linear.com/LT3088

APPLICATIONS INFORMATION

Protection Features

The LT3088 incorporates several protection features ideal

for harsh industrial and automotive environments, among

otherapplications.Inadditiontonormalmonolithicregula-

torprotectionfeaturessuchascurrentlimitingandthermal

limiting, the LT3088 protects itself against reverse-input

voltages, reverse-output voltages, and large 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 the rated absolute

maximum junction temperature. The thermal shutdown

circuit’s temperature threshold is typically 165°C and

incorporates about 5°C of hysteresis.

TheLT3088’sINpinwithstands±40Vvoltageswithrespect

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

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

protecting the LT3088 and sensitive loads.

Clamping diodes and 400Ω limiting resistors protect the

LT3088’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 ±25mA crosspin

current flow without damage. Relative to these applica-

tion concerns, note the following two scenarios. The first

scenario employs a noise-reducing SET pin bypass ca-

pacitor 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.

During normal operation, keep OUT-to-SET differential

voltages below 2V.

SET

RSET

30.1k

10m

OUT

–

LT3088

ISET

50µA

VOUT

1.6A

VIN

SET

10m

OUT

–

LT3088

ISET

50µA

3088 TA02

8.2*

3.3VOUT

2.3A

*4mV DROP ENSURES LT3088 IS OFF WITH NO LOAD

MULTIPLE LT3088s CAN BE USED

SET

20m

OUT

–

LT3088

ISET

50µA

3088 TA03

6.2k

10µF

LT1963-3.3

47µF

20m

TYPICAL APPLICATIONS

Paralleling Regulators

Boosting Fixed Output Regulators

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