Integrated Circuits (ICs)

LTC3805MPMSE#PBF

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Analog Devices

ADJUSTABLE FREQUENCY CURRENT MODE FLYBACK DC/DC CONTROLLER

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DocumentsR421 Reliability Data Datasheet

Integrated Circuits (ICs)

LTC3805MPMSE#PBF

Active

Analog Devices

ADJUSTABLE FREQUENCY CURRENT MODE FLYBACK DC/DC CONTROLLER

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DocumentsR421 Reliability Data Datasheet

Specifications Series Pricing Description Documents

Technical Specifications

Parameters and characteristics for this part

Specification	LTC3805MPMSE#PBF

Clock Sync	True
Control Features	Soft Start, Enable
Duty Cycle (Max)	80 %
Frequency - Switching [Max]	700 kHz
Frequency - Switching [Min]	70 kHz
Function	Step-Up/Step-Down
Mounting Type	Surface Mount
Number of Outputs	1
Operating Temperature [Max]	150 °C
Operating Temperature [Min]	-55 °C
Output Configuration	Positive, Isolation Capable
Output Phases	1
Output Type	Transistor Driver
Package / Case	3 Lead, 0.118 in
Package / Case	Exposed Pad, 10-TFSOP, 10-MSOP
Supplier Device Package	10-MSOP-EP
Synchronous Rectifier	False
Topology	Flyback
Voltage - Supply (Vcc/Vdd) [Max]	9.5 V
Voltage - Supply (Vcc/Vdd) [Min]	3.95 V

LTC3805-5 Series

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

Part	Output Phases	Function	Mounting Type	Duty Cycle (Max)	Topology	Package / Case	Package / Case	Output Configuration	Number of Outputs	Control Features	Operating Temperature [Min]	Operating Temperature [Max]	Supplier Device Package	Voltage - Supply (Vcc/Vdd) [Max]	Voltage - Supply (Vcc/Vdd) [Min]	Frequency - Switching [Min]	Frequency - Switching [Max]	Output Type
Analog Devices LTC3805MPMSE#PBF	1	Step-Up/Step-Down	Surface Mount	80 %	Flyback	0.118 in 3 Lead	10-MSOP 10-TFSOP Exposed Pad	Isolation Capable Positive	1	Enable Soft Start	-55 °C	150 °C	10-MSOP-EP	9.5 V	3.95 V	70 kHz	700 kHz	Transistor Driver
Analog Devices LTC3805IMSE#TRPBF	1	Step-Up/Step-Down	Surface Mount	80 %	Flyback	0.118 in 3 Lead	10-MSOP 10-TFSOP Exposed Pad	Isolation Capable Positive	1	Enable Soft Start	-40 °C	125 ¯C	10-MSOP-EP	9.5 V	3.95 V	70 kHz	700 kHz	Transistor Driver
Analog Devices LTC3805EMSE-5#TRPBF	1	Step-Up Step-Up/Step-Down	Surface Mount	80 %	Boost Flyback SEPIC	0.118 in 3 Lead	10-MSOP 10-TFSOP Exposed Pad	Isolation Capable Positive	1	Enable Soft Start	-40 °C	85 °C	10-MSOP-EP	9.5 V	3.95 V	70 kHz	700 kHz	Transistor Driver
Analog Devices LTC3805IDD-5#TRPBF	1	Step-Up Step-Up/Step-Down	Surface Mount	80 %	Boost Flyback SEPIC		10-WFDFN Exposed Pad	Isolation Capable Positive	1	Enable Soft Start	-40 °C	125 ¯C	10-DFN (3x3)	9.5 V	3.95 V	70 kHz	700 kHz	Transistor Driver
Analog Devices LTC3805EMSE#TRPBF	1	Step-Up/Step-Down	Surface Mount	80 %	Flyback	0.118 in 3 Lead	10-MSOP 10-TFSOP Exposed Pad	Isolation Capable Positive	1	Enable Soft Start	-40 °C	85 °C	10-MSOP-EP	9.5 V	3.95 V	70 kHz	700 kHz	Transistor Driver
Analog Devices LTC3805EDD-5#PBF	1	Step-Up Step-Up/Step-Down	Surface Mount	80 %	Boost Flyback SEPIC		10-WFDFN Exposed Pad	Isolation Capable Positive	1	Enable Soft Start	-40 °C	85 °C	10-DFN (3x3)	9.5 V	3.95 V	70 kHz	700 kHz	Transistor Driver
Analog Devices LTC3805EMSE#PBF	1	Step-Up/Step-Down	Surface Mount	80 %	Flyback	0.118 in 3 Lead	10-MSOP 10-TFSOP Exposed Pad	Isolation Capable Positive	1	Enable Soft Start	-40 °C	85 °C	10-MSOP-EP	9.5 V	3.95 V	70 kHz	700 kHz	Transistor Driver
Analog Devices LTC3805EDD#TRPBF	1	Step-Up/Step-Down	Surface Mount	80 %	Flyback		10-WFDFN Exposed Pad	Isolation Capable Positive	1	Enable Soft Start	-40 °C	85 °C	10-DFN (3x3)	9.5 V	3.95 V	70 kHz	700 kHz	Transistor Driver
Analog Devices LTC3805HMSE#PBF	1	Step-Up/Step-Down	Surface Mount	80 %	Flyback	0.118 in 3 Lead	10-MSOP 10-TFSOP Exposed Pad	Isolation Capable Positive	1	Enable Soft Start	-40 °C	150 °C	10-MSOP-EP	9.5 V	3.95 V	70 kHz	700 kHz	Transistor Driver
Analog Devices LTC3805EDD-5#TRPBF	1	Step-Up Step-Up/Step-Down	Surface Mount	80 %	Boost Flyback SEPIC		10-WFDFN Exposed Pad	Isolation Capable Positive	1	Enable Soft Start	-40 °C	85 °C	10-DFN (3x3)	9.5 V	3.95 V	70 kHz	700 kHz	Transistor Driver

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$

Digikey	Tube	1	$ 14.72
		10	$ 10.49
		25	$ 9.40
		100	$ 8.18
		250	$ 7.59
		500	$ 7.24
		1000	$ 7.09
Newark	Each	1	$ 13.87
		10	$ 9.61
		25	$ 8.72
		50	$ 7.82
		100	$ 7.25
		250	$ 7.09

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