LTC3873EDDB#TRPBF

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Analog Devices Inc./Maxim Integrated

NO RSENSE™CONSTANT FREQUENCY CURRENT MODE BOOST/FLYBACK/SEPIC DC/DC CONTROLLER

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LTC3873EDDB#TRPBF

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Analog Devices Inc./Maxim Integrated

NO RSENSE™CONSTANT FREQUENCY CURRENT MODE BOOST/FLYBACK/SEPIC DC/DC CONTROLLER

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Description Specifications Series Pricing CAD Documents

Description

General part information

LTC3873 Series

The LTC3873 is a constant frequency, current mode, boost, flyback or SEPIC DC/DC controller that drives an N-channel power MOSFET in high input and output voltage converter applications. Soft-start can be programmed using an external capacitor.The LTC3873 provides ±1.5% output voltage accuracy and consumes only 300μA quiescent current during normal operation and only 55μA during micropower start-up. Using a 9.3V internal shunt regulator, the LTC3873 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.The LTC3873 is available in 8-lead ThinSOT and 2mm x 3mm DFN packages.LTC3873LTC3873-5VCCUV+8.4V4.1VVCCUV–4V2.9VAPPLICATIONSTelecom Power Supplies42V and 12V Automotive Power SuppliesPortable Electronic Equipment

Technical Specifications

Parameters and characteristics for this part

Specification	LTC3873EDDB#TRPBF

Clock Sync	No
Control Features	Enable, Soft Start, Current Limit
Duty Cycle (Max)	78 %
Function	Step-Up, Step-Up/Step-Down
Mounting Type	Surface Mount
Number of Outputs	1
Operating Temperature (Max)	85 °C
Operating Temperature (Min)	-40 °C
Output Configuration	Positive, Isolation Capable
Output Phases	1
Output Type	Transistor Driver
Package / Case	8-WFDFN Exposed Pad
Package Length	3 mm
Package Name	8-DFN
Package Width	2 mm
Synchronous Rectifier	No
Topology	SEPIC, Flyback, Boost
Voltage - Supply (Vcc/Vdd) Maximum	60 V
Voltage - Supply (Vcc/Vdd) Minimum	8.4 V

LTC3873 Series

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

Part	Clock Sync	Voltage - Supply (Vcc/Vdd) Maximum	Voltage - Supply (Vcc/Vdd) Minimum	Output Phases	Control Features	Function	Package Name	Topology	Output Configuration	Mounting Type	Output Type	Package / Case	Operating Temperature (Max)	Operating Temperature (Min)	Duty Cycle (Max)	Number of Outputs	Synchronous Rectifier	Package Width	Package Length
Analog Devices Inc./Maxim Integrated LTC3873ETS8#TRMPBF	No	60 V	8.4 V	1	Current Limit Enable Soft Start	Step-Up Step-Up/Step-Down	TSOT-23-8	Boost Flyback SEPIC	Isolation Capable Positive	Surface Mount	Transistor Driver	SOT-23-8 Thin TSOT-23-8	85 °C	-40 °C	78 %	1	No
Analog Devices Inc./Maxim Integrated LTC3873EDDB#TRMPBF	No	60 V	8.4 V	1	Current Limit Enable Soft Start	Step-Up Step-Up/Step-Down	8-DFN	Boost Flyback SEPIC	Isolation Capable Positive	Surface Mount	Transistor Driver	8-WFDFN Exposed Pad	85 °C	-40 °C	78 %	1	No	2 mm	3 mm
Analog Devices Inc./Maxim Integrated LTC3873ETS8#TRPBF	No	60 V	8.4 V	1	Current Limit Enable Soft Start	Step-Up Step-Up/Step-Down	TSOT-23-8	Boost Flyback SEPIC	Isolation Capable Positive	Surface Mount	Transistor Driver	SOT-23-8 Thin TSOT-23-8	85 °C	-40 °C	78 %	1	No
Analog Devices Inc./Maxim Integrated LTC3873EDDB#TRPBF	No	60 V	8.4 V	1	Current Limit Enable Soft Start	Step-Up Step-Up/Step-Down	8-DFN	Boost Flyback SEPIC	Isolation Capable Positive	Surface Mount	Transistor Driver	8-WFDFN Exposed Pad	85 °C	-40 °C	78 %	1	No	2 mm	3 mm

Pricing

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CAD

3D models and CAD resources for this part

Documents

Technical documentation and resources

R421 Reliability Data

LTC3873: No RSENSE Constant Frequency Current Mode Boost/Flyback/SEPIC DC/DC Controller Data Sheet (Rev.C)

LTC3873EDDB#TRPBF | Datasheet

Tape and Reel Packaging