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LT3905

Linear Technology
Part Number LT3905
Manufacturer Linear Technology
Description Boost DC/DC Converter
Published Jun 22, 2014
Detailed Description LT3905 Boost DC/DC Converter with APD Current Monitor FEATURES 65V, 350mA Internal DMOS Switch n Integrated Schottky D...
Datasheet PDF File LT3905 PDF File

LT3905
LT3905

Overview
LT3905 Boost DC/DC Converter with APD Current Monitor FEATURES 65V, 350mA Internal DMOS Switch n Integrated Schottky Diode n 2% Accurate APD Current Monitoring Over the 3µA to 3mA Range n Single Resistor Programs Maximum APD Current n Fast APD Current Limiter with Indicator n Programmable Loss-of-Signal Indicator n CTRL Pin Adjusts Output Voltage n Programmable V Undervoltage Lockout IN n High Efficiency Step-Up Converter n Selectable 1MHz/2MHz Switching Frequency n Internally Compensated n Internal Soft-Start n 2.
7V to 12V V Range IN n Low Shutdown Current: <1µA n DESCRIPTION The LT®3905 is a fixed frequency current-mode step-up converter designed to bias avalanche photodiodes (APD) in optical receivers.
The LT3905 features high side APD current monitoring over five 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, the LT3905 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.
The LT3905 is available in the tiny footprint (3mm × 3mm) 16-Lead QFN Package.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
APPLICATIONS n n n n APD Bias PIN Diode Bias Optical Receivers and Modules Fiber Optic Network Equipment TYPICAL APPLICATION Adjustable APD Bias Supply VIN 2.
7V to 12V 10µH 1µF EN/UVLO VIN LOS_ADJ fSEL VOUT ADJUST VIN 100k 100k LOS ILIM 1:10 LOS_MON CTRL LT3905 SW UP TO 54V 634k 15k MONIN GND APD 1:20 ILIM_MON 9.
09k 2.
75m...


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