LT3571IUD#TRPBF

LT®3571 is a current mode step-up DC/DC converter designed to bias avalanche photodiodes (APDs) in optical receivers with an output voltage up to 75V. This features a high side fi xed voltage drop APD current monitor with better than 10% relative accuracy over the entire temperature range. The integrated power switch, schottky diode and APD current monitor allow a small solution footprint and low solution cost. It combines a traditional voltage loop and a unique current loop to operate as a constant-current source or constant-voltage source. The inductor-based topology ensures an input free from switching noise. The integrated high side current monitor produces a current proportional to the APD current with better than 10% relative accuracy over four decades of dynamic range in the input range of 250nA to 2.5mA. Typical applications are APD bias, PIN diode bias, optical receivers and modules, fibre optic network equipment.

• Integrated schottky diode, 75V, 370mA internal switch
• High side fixed voltage drop APD current monitor, frequency synchronization
• Adjustable frequency range from 250KHz to 2MHz
• Constant-voltage and constant-current regulation
• Programmable current limit protection, surface mount components
• Low shutdown current <lt/>1μA, CTRL pin allows output adjustment with no polarity inversion
• Internal soft-start, internal compensation
• Minimum operating voltage is 2.7V, maximum operating voltage is 20V
• 16-lead plastic QFN package
• Temperature rating range from –40°C to 125°C

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party