LTC3805 Series

Adjustable Frequency Current Mode Flyback DC/DC Controller

Manufacturer: Analog Devices Inc./Maxim Integrated

Catalog

Adjustable Frequency Current Mode Flyback DC/DC Controller

Part	Voltage - Supply (Vcc/Vdd) Minimum	Voltage - Supply (Vcc/Vdd) Maximum	Control Features	Output Type	Mounting Type	Topology	Function	Output Configuration	Clock Sync	Synchronous Rectifier	Duty Cycle (Max)	Frequency - Switching (Max)	Frequency - Switching (Min)	Output Phases	Package Name	Operating Temperature (Min)	Operating Temperature (Max)	Number of Outputs	Package Width	Package Features	Package Length	Package / Case
Analog Devices Inc./Maxim Integrated LTC3805MPMSE#PBF	3.95 V	9.5 V	Enable Soft Start	Transistor Driver	Surface Mount	Flyback	Step-Down Step-Up	Isolation Capable Positive	Yes	No	80 %	700 kHz	70 kHz	1	10-MSOP 10-MSOP-EP	-55 °C	150 °C	1	3 mm	Exposed Pad	0.118 in
Analog Devices Inc./Maxim Integrated LTC3805IDD#PBF	3.95 V	9.5 V	Enable Soft Start	Transistor Driver	Surface Mount	Flyback	Step-Down Step-Up	Isolation Capable Positive	Yes	No	80 %	700 kHz	70 kHz	1	10-DFN	-40 °C	125 °C	1	3 mm		3 mm	10-WFDFN Exposed Pad
Analog Devices Inc./Maxim Integrated LTC3805IDD#TRPBF	3.95 V	9.5 V	Enable Soft Start	Transistor Driver	Surface Mount	Flyback	Step-Down Step-Up	Isolation Capable Positive	Yes	No	80 %	700 kHz	70 kHz	1	10-DFN	-40 °C	125 °C	1	3 mm		3 mm	10-WFDFN Exposed Pad
Analog Devices Inc./Maxim Integrated LTC3805IMSE#TRPBF	3.95 V	9.5 V	Enable Soft Start	Transistor Driver	Surface Mount	Flyback	Step-Down Step-Up	Isolation Capable Positive	Yes	No	80 %	700 kHz	70 kHz	1	10-MSOP 10-MSOP-EP	-40 °C	125 °C	1	3 mm	Exposed Pad	0.118 in
Analog Devices Inc./Maxim Integrated LTC3805EMSE-5#TRPBF	3.95 V	9.5 V	Enable Soft Start	Transistor Driver	Surface Mount	Boost Flyback SEPIC	Step-Up Step-Up/Step-Down	Isolation Capable Positive	Yes	No	80 %	700 kHz	70 kHz	1	10-MSOP 10-MSOP-EP	-40 °C	85 °C	1	3 mm	Exposed Pad	0.118 in
Analog Devices Inc./Maxim Integrated LTC3805IDD-5#TRPBF	3.95 V	9.5 V	Enable Soft Start	Transistor Driver	Surface Mount	Boost Flyback SEPIC	Step-Up Step-Up/Step-Down	Isolation Capable Positive	Yes	No	80 %	700 kHz	70 kHz	1	10-DFN	-40 °C	125 °C	1	3 mm		3 mm	10-WFDFN Exposed Pad
Analog Devices Inc./Maxim Integrated LTC3805EDD#PBF	3.95 V	9.5 V	Enable Soft Start	Transistor Driver	Surface Mount	Flyback	Step-Down Step-Up	Isolation Capable Positive	Yes	No	80 %	700 kHz	70 kHz	1	10-DFN	-40 °C	85 °C	1	3 mm		3 mm	10-WFDFN Exposed Pad
Analog Devices Inc./Maxim Integrated LTC3805EMSE#TRPBF	3.95 V	9.5 V	Enable Soft Start	Transistor Driver	Surface Mount	Flyback	Step-Down Step-Up	Isolation Capable Positive	Yes	No	80 %	700 kHz	70 kHz	1	10-MSOP 10-MSOP-EP	-40 °C	85 °C	1	3 mm	Exposed Pad	0.118 in
Analog Devices Inc./Maxim Integrated LTC3805EDD-5#PBF	3.95 V	9.5 V	Enable Soft Start	Transistor Driver	Surface Mount	Boost Flyback SEPIC	Step-Up Step-Up/Step-Down	Isolation Capable Positive	Yes	No	80 %	700 kHz	70 kHz	1	10-DFN	-40 °C	85 °C	1	3 mm		3 mm	10-WFDFN Exposed Pad
Analog Devices Inc./Maxim Integrated LTC3805EMSE#PBF	3.95 V	9.5 V	Enable Soft Start	Transistor Driver	Surface Mount	Flyback	Step-Down Step-Up	Isolation Capable Positive	Yes	No	80 %	700 kHz	70 kHz	1	10-MSOP 10-MSOP-EP	-40 °C	85 °C	1	3 mm	Exposed Pad	0.118 in

Catalog

Adjustable Frequency Current Mode Flyback DC/DC Controller

Description

The LTC3805 is a current mode controller for flyback DC/DC converters designed to drive an N-channel MOSFET in high input and output voltage converter applications. Operating frequency and slope compensation can be programmed by external resistors. Programmable overcurrent sensing protects the converter from short-circuits. Soft-start can be programmed using an external capacitor and the soft-start capacitor also programs an automatic restart feature.The LTC3805 provides ±1.5% output voltage accuracy and consumes only 360μA of quiescent current during normal operation and only 40μA during micropower startup. Using a 9.5V internal shunt regulator, the LTC3805 can be powered from a high VINthrough a resistor or it can be powered directly from a low impedance DC voltage of 9V or less.The LTC3805 is available in the 10-lead MSOP package and the 3mm × 3mm DFN package.Turn On VoltageLTC38058.4VLTC3805-54.5VApplicationsTelecom Power Supplies42V and 12V Automotive Power SuppliesIsolated Electronic Equipment