LTC3873-5 Series

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

Catalog

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

Part	Operating Temperature [Min]	Operating Temperature [Max]	Package / Case	Supplier Device Package	Topology	Mounting Type	Function	Number of Outputs	Output Type	Output Configuration	Output Phases	Voltage - Supply (Vcc/Vdd) [Min]	Voltage - Supply (Vcc/Vdd) [Max]	Duty Cycle (Max) [Max]	Control Features
Analog Devices LTC3873ITS8-5#TRPBF	-40 °C	125 ¯C	SOT-23-8 Thin TSOT-23-8	TSOT-23-8	Boost Flyback SEPIC	Surface Mount	Step-Up Step-Up/Step-Down	1	Transistor Driver	Isolation Capable Positive	1	4.1 V	60 V	78 %	Current Limit Enable Soft Start
Analog Devices LTC3873ETS8-5#TRPBF	-40 °C	85 °C	SOT-23-8 Thin TSOT-23-8	TSOT-23-8	Boost Flyback SEPIC	Surface Mount	Step-Up Step-Up/Step-Down	1	Transistor Driver	Isolation Capable Positive	1	4.1 V	60 V	78 %	Current Limit Enable Soft Start
Analog Devices LTC3873IDDB-5#TRPBF	-40 °C	125 ¯C	8-WFDFN Exposed Pad	8-DFN (3x2)	Boost Flyback SEPIC	Surface Mount	Step-Up Step-Up/Step-Down	1	Transistor Driver	Isolation Capable Positive	1	4.1 V	60 V	78 %	Current Limit Enable Soft Start
Analog Devices LTC3873EDDB#TRMPBF	-40 °C	85 °C	8-WFDFN Exposed Pad	8-DFN (3x2)	Boost Flyback SEPIC	Surface Mount	Step-Up Step-Up/Step-Down	1	Transistor Driver	Isolation Capable Positive	1	8.4 V	60 V	78 %	Current Limit Enable Soft Start
Analog Devices LTC3873ETS8-5#TRMPBF	-40 °C	85 °C	SOT-23-8 Thin TSOT-23-8	TSOT-23-8	Boost Flyback SEPIC	Surface Mount	Step-Up Step-Up/Step-Down	1	Transistor Driver	Isolation Capable Positive	1	4.1 V	60 V	78 %	Current Limit Enable Soft Start
Analog Devices LTC3873ITS8-5#TRMPBF	-40 °C	125 ¯C	SOT-23-8 Thin TSOT-23-8	TSOT-23-8	Boost Flyback SEPIC	Surface Mount	Step-Up Step-Up/Step-Down	1	Transistor Driver	Isolation Capable Positive	1	4.1 V	60 V	78 %	Current Limit Enable Soft Start

Catalog

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

Key Features

• VINand VOUTLimited 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 LevelMOSFET Applications

• Low Quiescent Current: 300µA

• Low Profile (1mm) ThinSOT™and (0.75mm) 2mm × 3mm DFN Package

Description

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.LTC3873LTC3873-5VCCUV+8.4V3.9VVCCUV–4V2.9VApplicationsTelecom Power SuppliesAutomotive Power SuppliesPoE Applications