LT3905EUD#PBF

Active

Analog Devices Inc./Maxim Integrated

DC-DC SWITCHING BOOST REGULATOR, ADJUSTABLE, 2.7 TO 12V IN, 65V/0.35A OUT, QFN-EP-16

LT3905EUD#PBF

Active

Analog Devices Inc./Maxim Integrated

DC-DC SWITCHING BOOST REGULATOR, ADJUSTABLE, 2.7 TO 12V IN, 65V/0.35A OUT, QFN-EP-16

Description Specifications Series Pricing CAD Documents

Description

General part information

LT3905 Series

The LT3905 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 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, 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.ApplicationsAPD BiasPIN Diode BiasOptical Receivers and ModulesFiber Optic Network Equipment

Technical Specifications

Parameters and characteristics for this part

Specification	LT3905EUD#PBF

Current - Output	350 mA
Frequency - Switching (Max)	2 MHz
Frequency - Switching (Min)	1 MHz
Function	Step-Up
Mounting Type	Surface Mount
Number of Outputs	1
Operating Temperature (Max)	125 °C
Operating Temperature (Min)	-40 °C
Output Configuration	Positive
Output Type	Adjustable
Package / Case	16-WFQFN Exposed Pad
Package Length	3 mm
Package Name	16-QFN
Package Width	3 mm
Synchronous Rectifier	No
Topology	Boost
Voltage - Input (Max)	12 V
Voltage - Input (Min)	2.7 V
Voltage - Output (Max)	65 V
Voltage - Output (Min/Fixed)	1.248 V

LT3905 Series

Boost DC/DC Converter with APD Current Monitor

Part	Output Type	Output Configuration	Voltage - Input (Min)	Number of Outputs	Mounting Type	Frequency - Switching (Min)	Frequency - Switching (Max)	Package / Case	Operating Temperature (Max)	Operating Temperature (Min)	Package Width	Package Name	Package Length	Current - Output	Function	Voltage - Output (Min/Fixed)	Voltage - Output (Max)	Topology	Synchronous Rectifier	Voltage - Input (Max)	Utilized IC / Part	Voltage - Output	Main Purpose	Frequency - Switching	Total Output Count	Non-Isolated Output Count	Voltage - Input (Minimum)	Voltage - Input (Maximum)	Contents	Regulator Topology
Analog Devices Inc./Maxim Integrated LT3905IUD#PBF	Adjustable	Positive	2.7 V	1	Surface Mount	1 MHz	2 MHz	16-WFQFN Exposed Pad	125 °C	-40 °C	3 mm	16-QFN	3 mm	350 mA	Step-Up	1.248 V	65 V	Boost	No	12 V
Analog Devices Inc./Maxim Integrated DC1956A	Non-Isolated													2 mA							LT3905	50 V	DC/DC Step Up	1 MHz	1	1 count	2.7 V	12 V	Board	Boost
Analog Devices Inc./Maxim Integrated LT3905EUD#PBF	Adjustable	Positive	2.7 V	1	Surface Mount	1 MHz	2 MHz	16-WFQFN Exposed Pad	125 °C	-40 °C	3 mm	16-QFN	3 mm	350 mA	Step-Up	1.248 V	65 V	Boost	No	12 V
Analog Devices Inc./Maxim Integrated LT3905IUD#TRPBF	Adjustable	Positive	2.7 V	1	Surface Mount	1 MHz	2 MHz	16-WFQFN Exposed Pad	125 °C	-40 °C	3 mm	16-QFN	3 mm	350 mA	Step-Up	1.248 V	65 V	Boost	No	12 V
Analog Devices Inc./Maxim Integrated LT3905EUD#TRPBF	Adjustable	Positive	2.7 V	1	Surface Mount	1 MHz	2 MHz	16-WFQFN Exposed Pad	125 °C	-40 °C	3 mm	16-QFN	3 mm	350 mA	Step-Up	1.248 V	65 V	Boost	No	12 V

Pricing

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CAD

3D models and CAD resources for this part

Documents

Technical documentation and resources

LT3905EUD#PBF | Datasheet

R570 Reliability Data