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1.35 A Low-Dropout Positive Voltage Regulators: High efficiency. Small size.


The LDI1117 series by Diotec are positive linear voltage regulators with low dropout and output currents of up to 1.35 A. They offer a typical voltage drop of 1.15 V at 1 A and can be operated at up to 20 V of input voltage (maximum rating).

Parts are available with adjustable output voltage, ranging from 1.25 V to 13.65 V and set-up by just two additional resistors. Further available are versions offering a fixed output voltage of 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.3 V or 5.0 V.

All versions feature integrated current limiting and thermal shut-down circuits, which prevent damage in case of overload conditions. Furthermore, its internal circuitry comprises of trimmed bandgap reference, ensuring the tight output voltage accuracy of 1% tolerance. Adding of 22 pF at the output is recommended to attenuate transient response and ensure stability.

They are offered in low profile and space saving packages like SOT-223, SO-8 and SOT-89. All these packages are totally lead-free and in full compliance to ROHS and REACH without any exemptions.


  • Low dropout: Typ. 1.15 V
  • Narrow Tolerance
  • Current Limiting & Thermal Overload Protection
  • Totally lead-free devices



  • Post regulators for switch mode power supplies
  • Battery Chargers
  • USB devices
  • Active SCSI termination regulator

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