LTC3805IDD-5#PBF

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Analog Devices Inc./Maxim Integrated

ADJUSTABLE FREQUENCY CURRENT MODE FLYBACK/BOOST/SEPIC DC/DC CONTROLLER

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LTC3805IDD-5#PBF

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Analog Devices Inc./Maxim Integrated

ADJUSTABLE FREQUENCY CURRENT MODE FLYBACK/BOOST/SEPIC DC/DC CONTROLLER

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Description Specifications Series Pricing CAD Documents

Description

General part information

LTC3805-5 Series

The LTC3805-5 is a current mode DC/DC controller designed to drive an N-channel MOSFET in flyback, boost and SEPIC converter applications. Operating frequency and slope compensation can be programmed by external resistors. Programmable overcurrent sensing protects the converter from overload and short-circuit conditions. Soft-start can be programmed using an external capacitor and the soft-start capacitor also programs an automatic restart feature.The LTC3805-5 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 LTC3805-5 can be powered from a high VINthrough a resistor or it can be powered directly from a low impedance DC voltage from 4.7V to 8.8V.The LTC3805-5 is available in the 10-lead MSOP package and the 3mm × 3mm DFN package.Turn On VoltageLTC38058.4VLTC3805-54.5VApplicationsAutomotive Power SuppliesTelecom Power SuppliesIsolated Electronic EquipmentAuxiliary/Housekeeping Power SuppliesPower over Ethernet

Technical Specifications

Parameters and characteristics for this part

Specification	LTC3805IDD-5#PBF

Clock Sync	Yes
Control Features	Soft Start, Enable
Duty Cycle (Max)	80 %
Frequency - Switching (Max)	700 kHz
Frequency - Switching (Min)	70 kHz
Function	Step-Up, Step-Up/Step-Down
Mounting Type	Surface Mount
Number of Outputs	1
Operating Temperature (Max)	125 °C
Operating Temperature (Min)	-40 °C
Output Configuration	Positive, Isolation Capable
Output Phases	1
Output Type	Transistor Driver
Package / Case	10-WFDFN Exposed Pad
Package Length	3 mm
Package Name	10-DFN
Package Width	3 mm
Synchronous Rectifier	No
Topology	SEPIC, Flyback, Boost
Voltage - Supply (Vcc/Vdd) Maximum	9.5 V
Voltage - Supply (Vcc/Vdd) Minimum	3.95 V

LTC3805-5 Series

Adjustable Frequency Current Mode Flyback/Boost/SEPIC DC/DC Controller

Part	Operating Temperature (Max)	Operating Temperature (Min)	Output Phases	Function	Synchronous Rectifier	Frequency - Switching (Max)	Frequency - Switching (Min)	Number of Outputs	Package Length	Package Name	Package Width	Output Type	Mounting Type	Control Features	Voltage - Supply (Vcc/Vdd) Minimum	Voltage - Supply (Vcc/Vdd) Maximum	Topology	Duty Cycle (Max)	Clock Sync	Output Configuration	Package / Case	Package Features
Analog Devices Inc./Maxim Integrated LTC3805IDD-5#PBF	125 °C	-40 °C	1	Step-Up Step-Up/Step-Down	No	700 kHz	70 kHz	1	3 mm	10-DFN	3 mm	Transistor Driver	Surface Mount	Enable Soft Start	3.95 V	9.5 V	Boost Flyback SEPIC	80 %	Yes	Isolation Capable Positive	10-WFDFN Exposed Pad
Analog Devices Inc./Maxim Integrated LTC3805HMSE-5#PBF	150 °C	-40 °C	1	Step-Up Step-Up/Step-Down	No	700 kHz	70 kHz	1	0.118 in	10-MSOP 10-MSOP-EP	3 mm	Transistor Driver	Surface Mount	Enable Soft Start	3.95 V	9.5 V	Boost Flyback SEPIC	80 %	Yes	Isolation Capable Positive		Exposed Pad

Pricing

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CAD

3D models and CAD resources for this part

Documents

Technical documentation and resources

R421 Reliability Data

LTC3805IDD-5#PBF | Datasheet