LT3571IUD#PBF

LINEAR TECHNOLOGY  LT3571IUD#PBF  直流/直流开关升压逐步递增稳压器, 可调, 2.7V-20V输入, 75V/370mA输出, 2.3MHz, QFN-16

The is a current-mode step-up DC-to-DC Converter designed to bias avalanche photodiodes APDs in optical receivers with an output voltage up to 75V. The LT3571 features a high side fixed 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. This current can be used as a reference to provide a digitally programmed output voltage via the CTRL pin.

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Integrated Schottky diode

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High side fixed voltage drop APD current monitor

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Frequency synchronization

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Constant-voltage and constant-current regulation

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Programmable current limit protection

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Surface mount components

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Internal soft-start

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Internal compensation

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CTRL pin allows output adjustment with no polarity inversion

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Up to 70V high APD voltage

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<1µA Low shutdown current