LTC3809EDD-1#PBF

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Analog Devices Inc./Maxim Integrated

NO RSENSE™, LOW INPUT VOLTAGE, SYNCHRONOUS DC/DC CONTROLLER WITH OUTPUT TRACKING

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LTC3809EDD-1#PBF

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Analog Devices Inc./Maxim Integrated

NO RSENSE™, LOW INPUT VOLTAGE, SYNCHRONOUS DC/DC CONTROLLER WITH OUTPUT TRACKING

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Description Specifications Series Pricing CAD Documents

Description

General part information

LTC3809-1 Series

The LTC3809-1 is a synchronous step-down switching regulator controller that drives external complementary power MOSFETs using few external components. The constant frequency current mode architecture with MOSFET VDSsensing eliminates the need for a current sense resistor and improves efficiency.Optional Burst Mode operation provides high efficiency operation at light loads. 100% duty cycle provides low dropout operation, extending operating time in battery-powered systems. Burst Mode is inhibited when the MODE pin is pulled low to reduce noise and RF interference.The LTC3809-1 allows either coincident or ratiometric output voltage tracking. Switching frequency is fixed at 550kHz. Fault protection is provided by an overvoltage comparator and a short-circuit current limit comparator.The LTC3809-1 is available in tiny footprint thermally enhanced DFN and 10-lead MSOP packages.FeaturesPackageLTC3809PLL, Selectable Spread Spectrum, Power Good3x3 DFN-10, MS-10ELTC3809-1Tracking3x3 DFN-10, MS-10ELTC3808PLL, Selectable Spread Spectrum, Tracking, Power Good4x3 DFN-14, SSOP-16Applications1- or 2-Cell Lithium-Ion Powered DevicesNotebook and Palmtop Computers, PDAsPortable InstrumentsDistributed DC Power Systems

Technical Specifications

Parameters and characteristics for this part

Specification	LTC3809EDD-1#PBF

Clock Sync	No
Control Features	Tracking, Enable, Soft Start
Duty Cycle (Max)	100 %
Frequency - Switching	550 kHz
Function	Step-Down
Mounting Type	Surface Mount
Number of Outputs	1
Operating Temperature (Max)	85 °C
Operating Temperature (Min)	-40 °C
Output Configuration	Positive
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	Yes
Topology	Buck
Voltage - Supply (Vcc/Vdd) Maximum	9.8 V
Voltage - Supply (Vcc/Vdd) Minimum	2.75 V

LTC3809-1 Series

Part	Voltage - Supply (Vcc/Vdd) Minimum	Voltage - Supply (Vcc/Vdd) Maximum	Function	Clock Sync	Package Name	Topology	Package Width	Package Features	Package Length	Duty Cycle (Max)	Synchronous Rectifier	Number of Outputs	Frequency - Switching	Control Features	Output Configuration	Mounting Type	Output Phases	Operating Temperature (Max)	Operating Temperature (Min)	Output Type	Package / Case
Analog Devices Inc./Maxim Integrated LTC3809IMSE-1#TRPBF	2.75 V	9.8 V	Step-Down	No	10-MSOP 10-MSOP-EP	Buck	3 mm	Exposed Pad	0.118 in	100 %	Yes	1	550 kHz	Enable Soft Start Tracking	Positive	Surface Mount	1	85 °C	-40 °C	Transistor Driver
Analog Devices Inc./Maxim Integrated LTC3809IMSE-1#PBF	2.75 V	9.8 V	Step-Down	No	10-MSOP 10-MSOP-EP	Buck	3 mm	Exposed Pad	0.118 in	100 %	Yes	1	550 kHz	Enable Soft Start Tracking	Positive	Surface Mount	1	85 °C	-40 °C	Transistor Driver
Analog Devices Inc./Maxim Integrated LTC3809EDD-1#TRPBF	2.75 V	9.8 V	Step-Down	No	10-DFN	Buck	3 mm		3 mm	100 %	Yes	1	550 kHz	Enable Soft Start Tracking	Positive	Surface Mount	1	85 °C	-40 °C	Transistor Driver	10-WFDFN Exposed Pad
Analog Devices Inc./Maxim Integrated LTC3809EMSE-1#PBF	2.75 V	9.8 V	Step-Down	No	10-MSOP 10-MSOP-EP	Buck	3 mm	Exposed Pad	0.118 in	100 %	Yes	1	550 kHz	Enable Soft Start Tracking	Positive	Surface Mount	1	85 °C	-40 °C	Transistor Driver
Analog Devices Inc./Maxim Integrated LTC3809IDD-1#TRPBF	2.75 V	9.8 V	Step-Down	No	10-DFN	Buck	3 mm		3 mm	100 %	Yes	1	550 kHz	Enable Soft Start Tracking	Positive	Surface Mount	1	85 °C	-40 °C	Transistor Driver	10-WFDFN Exposed Pad
Analog Devices Inc./Maxim Integrated LTC3809EMSE-1#TRPBF	2.75 V	9.8 V	Step-Down	No	10-MSOP 10-MSOP-EP	Buck	3 mm	Exposed Pad	0.118 in	100 %	Yes	1	550 kHz	Enable Soft Start Tracking	Positive	Surface Mount	1	85 °C	-40 °C	Transistor Driver
Analog Devices Inc./Maxim Integrated LTC3809EDD-1#PBF	2.75 V	9.8 V	Step-Down	No	10-DFN	Buck	3 mm		3 mm	100 %	Yes	1	550 kHz	Enable Soft Start Tracking	Positive	Surface Mount	1	85 °C	-40 °C	Transistor Driver	10-WFDFN Exposed Pad
Analog Devices Inc./Maxim Integrated LTC3809IDD-1#PBF	2.75 V	9.8 V	Step-Down	No	10-DFN	Buck	3 mm		3 mm	100 %	Yes	1	550 kHz	Enable Soft Start Tracking	Positive	Surface Mount	1	85 °C	-40 °C	Transistor Driver	10-WFDFN Exposed Pad

Pricing

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CAD

3D models and CAD resources for this part

Documents

Technical documentation and resources

R421 Reliability Data

LTC3809EDD-1#PBF | Datasheet