LT3081 Series Regulators

By Analog Devices Inc 94

LT3081 Series Regulators

The Linear Technology LT3081 is a 1.5 A 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 50 µA reference current source allows a single resistor to program output voltage to any level between zero and 34.5 V. 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 (1 µA / °C) provide system monitoring and debug capability. In addition, a single resistor programs a 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 D2PAK, and an 12-lead 4 mm × 4 mm DFN.

  • Extended safe operating area
  • Maximum output current: 1.5 A
  • Stable with or without input/output capacitors
  • Wide input voltage range: 1.2 V to 36 V
  • Single resistor sets output voltage
  • Output current monitor: IMON = IOUT / 5000
  • Junction temperature monitor: 1 µA / °C
  • Output adjustable to 0 V
  • 50 µA SET pin current: 1% initial accuracy
  • Output voltage noise: 27 µVRMS
  • Parallel multiple devices for higher current or heat spreading
  • Programmable current limit
  • Reverse-battery and reverse-current protection
  • Load regulation typical independent of VOUT <1 mV
  • Line regulation typical <0.001%/V
  • Available in thermally-enhanced 12-lead 4 mm × 4 mm DFN and 16-lead TSSOP, 7-lead D2PAK and 7-lead TO-220