LT3482 Datasheet | Linear Technology

LT3482 90V Boost DC/DC Converter with APD Current Monitor .. Features - - - - - - - - - - - - DESCRIPTIO U APPLICATIO S - - - - High Output Voltage: Up to 90V Integrated Schottky Diodes 48V, 280m A Internal Switch High Side APD Current Monitor Adjustable Switching Frequency: 650k Hz or 1.1MHz Wide VIN Range: 2.5V to 16V Surface Mount ponents Low Shutdown Current: <1µA Soft-Start Internal pensation CTRL Pin Allows Output Adjustment with No Polarity Inversion 3mm × 3mm 16-Lead QFN Package APD Bias PIN Diode Bias Optical Receivers and Modules Fiber Optic Network Equipment The LT®3482 is a fixed frequency current mode step-up DC/DC converter with voltage doubler designed to bias avalanche photodiodes (APDs) in optical receivers. It can provide up to 90V output. The LT3482 Features high side APD current monitoring with better than 10% relative accuracy over the entire temperature range. The integrated power switch, Schottky diodes and APD current monitor allow a small converter footprint and low solution cost. Constant switching frequency results in predictable output noise that is easy to filter. The inductor-based topology ensures an input free from switching noise. An integrated high side current monitor produces a current proportional to APD current with better than 10% relative accuracy over four decades of dynamic range in the input range of 250n A to 2.5m A. This current can be used as a reference to provide a digitally programmed output voltage via the CTRL pin. The LT3482 is available in the tiny footprint (3mm × 3mm) 16-lead QFN package. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATIO VIN 5V 1µF 10µH 0.1µF Output Voltage Ripple SW VIN f SET PUMP MONIN LT3482 VOUT2 VOUT1 FB APD 10k 85V AT 2.5m A 0.1µF 3482 TA01a OFF ON SHDN CTRL GND MON 0.47µF 0.47µF 0.1µF 1M VAPD RIPPLE 100m V/DIV 14k 10n...