LTC3873-5

PRODUCTION

No R_SENSE^™ Constant Frequency Current Mode Boost/Flyback/SEPIC DC/DC Controller

Part Models: 8
1ku List Price: Starting From $1.53

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Overview

V_IN and V_OUT Limited Only by External Components
Internal or Programmable External Soft-Start
Constant Frequency 200kHz Operation
Adjustable Current Limit
Current Sense Resistor Optional

±1.5% Voltage Reference Accuracy
Current Mode Operation for Excellent Line and Load Transient Response
4.1V Undervoltage Threshold for Logic Level
MOSFET Applications
Low Quiescent Current: 300µA
Low Profile (1mm) ThinSOT^™ and (0.75mm) 2mm × 3mm DFN Package

The LTC3873-5 is a constant frequency current mode controller for boost, flyback or SEPIC DC/DC converters designed to drive an N-channel MOSFET for high input and output voltage converter applications.

The LTC3873-5 provides ±1.5% output voltage accuracy and consumes only 300μA quiescent current during normal operation and only 50μA during micropower start-up. Using a 9.3V internal shunt regulator, the LTC3873-5 can be powered from a high input voltage through a resistor or it can be powered directly from a low impedance DC voltage of 9V or less. Soft-start can be programmed using an external capacitor.

The LTC3873-5 is available in 8-lead ThinSOT and 2mm × 3mm DFN packages.


	LTC3873	LTC3873-5
V_CC UV⁺	8.4V	3.9V
V_CC UV^–	4V	2.9V

Applications

Telecom Power Supplies
Automotive Power Supplies
PoE Applications

Part Models: 8
1ku List Price: Starting From $1.53

Documentation

Data Sheet 1

LTC3873-5: No RSENSE Constant Frequency Current Mode Boost/Flyback/SEPIC DC/DC Controller Data Sheet 10/02/2008

Reliability Data 1

R421 Reliability Data 03/23/2018

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC3873EDDB-5#TRMPBF	8-Lead DFN (3mm x 2mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3873EDDB-5#TRPBF	8-Lead DFN (3mm x 2mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3873ETS8-5#TRMPBF	8-Lead SOT-23	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3873ETS8-5#TRPBF	8-Lead SOT-23	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3873IDDB-5#TRMPBF	8-Lead DFN (3mm x 2mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3873IDDB-5#TRPBF	8-Lead DFN (3mm x 2mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3873ITS8-5#TRMPBF	8-Lead SOT-23	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3873ITS8-5#TRPBF	8-Lead SOT-23	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
LTC3873	PRODUCTION	No R_SENSE^™ Constant Frequency Current Mode Boost/Flyback/SEPIC DC/DC Controller

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LTC3873
LTC3873-5

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

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