LT3905EUD#PBF

LT3905 is a fixed frequency current-mode step-up converter designed to bias avalanche photodiodes (APD) in optical receivers. It features high side APD current monitoring over four decades of dynamic range with better than 2% relative accuracy over the 3µA to 3mA range. The maximum APD current is programmed with a single resistor, and a fast current limiter with indicator protects the APD during overload conditions. Adjustable output voltage provides dynamic bias control, and an adjustable loss-of-signal indicator flags low APD current. Coupled with the integrated DMOS power switch and schottky rectifier, this device provides a compact total solution with few external components and low solution cost. Constant switching frequency results in predictable output noise that is easy to filter. It is used in application such as APD bias, PIN diode bias, optical receivers and modules, fibre optic network equipment etc.

• Supply current is 350µA max at (VENUVLO = 1.3V, VFB = 2V, switcher standby)
• Single resistor programs maximum APD current
• Fast APD current limiter with indicator
• Programmable loss-of-signal indicator
• CTRL pin adjusts output voltage, programmable VIN undervoltage lockout
• High efficiency step-up converter, switching frequency is 1MHz typ
• Internally compensated, internal soft-start
• Input voltage range is 2.7V to 12V
• Operating temperature is -40°C to 125°C
• Package style is 16-lead plastic QFN

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