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1.5A low dropout linear regulator aimed at industrial apps

Posted: 24 Mar 2015 ?? ?Print Version ?Bookmark and Share

Keywords:Linear Technology? regulator? LDO? industrial? power supply?

Linear Technology has announced a 1.5A LDO plus regulator that monitors current and temperature. According to the company, the device has a wide safe area, allowing operation with high currents at high input-output differentials.

Output voltage is adjustable from zero to 37V and it withstands reverse voltage. In addition to regulating, it has a current monitor output, providing an analogue output current proportional to the output of the regulator.


The LT3081 is a 1.5A low dropout linear regulator designed for rugged industrial applications. Key features of the IC are the extended safe operating area (SOA), output current monitor, temperature monitor and programmable current limit. The LT3081 can be paralleled for higher output current or heat spreading. The device withstands reverse input and reverse output-to-input voltages without reverse current flow.

The LT3081's precision 50A reference current source allows a single resistor to program output voltage to any level between zero and 34.5V. The current reference architecture makes load regulation independent of output voltage. The LT3081 is stable with or without input and output capacitors.

The output current monitor (IOUT/5000) and die junction temperature output (1A/C) provide system monitoring and debug capability. In addition, a single resistor programs current limit.

Internal protection circuitry includes reverse-battery and reverse-current protection, current limiting and thermal limiting. The LT3081 is offered in the 16-lead TSSOP (with exposed pad for improved thermal performance), 7-lead TO-220, 7-lead DD-Pak, and an 12-lead 4mm x 4mm DFN.

LT3081 block diagram

Applications of the device include all surface mount power supply, rugged industrial power supply, post regulator for switching supplies, low output voltage supply and intrinsic safety applications.

- Jean-Pierre Joosting
??EE Times Europe

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