LTC3775IUD#TRPBF

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Analog Devices Inc./Maxim Integrated

HIGH FREQUENCY SYNCHRONOUS STEP-DOWN VOLTAGE MODE DC/DC CONTROLLER

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LTC3775IUD#TRPBF

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Analog Devices Inc./Maxim Integrated

HIGH FREQUENCY SYNCHRONOUS STEP-DOWN VOLTAGE MODE DC/DC CONTROLLER

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Description Specifications Series Pricing CAD Documents

Description

General part information

LTC3775 Series

The LTC3775 is a high efficiency synchronous step-down switching DC/DC controller that drives an all N-channel power MOSFET stage from a 4.5V to 38V input supply voltage. A patented line feedforward compensation circuit and a high bandwidth error amplifier provide very fast line and load transient response.High step-down ratios are made possible by a low 30ns minimum on-time, allowing extremely low duty cycles. MOSFET RDS(ON)current sensing maximizes efficiency. Alternatively, a sense resistor can be used for higher current limit accuracy. Continuous monitoring of the voltages across the top and bottom MOSFETs allows cycle-by-cycle control of the inductor current, configurable by external resistors.The soft-start function controls the duty cycle during start-up, providing a smooth output voltage ramp up. The operating frequency is user programmable from 250kHz to 1MHz and can be synchronized to an external clock.ApplicationsAutomotive SystemsTelecom and Industrial Power SuppliesPoint of Load Applications

Technical Specifications

Parameters and characteristics for this part

Specification	LTC3775IUD#TRPBF

Clock Sync	Yes
Control Features	Soft Start, Enable, Frequency Control, Current Limit
Duty Cycle (Max)	90 %
Frequency - Switching (Max)	1 MHz
Frequency - Switching (Min)	250 kHz
Function	Step-Down
Mounting Type	Surface Mount
Number of Outputs	1
Operating Temperature (Max)	125 °C
Operating Temperature (Min)	-40 °C
Output Configuration	Positive
Output Phases	1
Output Type	Transistor Driver
Package / Case	16-WFQFN Exposed Pad
Package Length	3 mm
Package Name	16-QFN
Package Width	3 mm
Synchronous Rectifier	Yes
Topology	Buck
Voltage - Supply (Vcc/Vdd) Maximum	38 V
Voltage - Supply (Vcc/Vdd) Minimum	4.5 V

LTC3775 Series

Part	Mounting Type	Clock Sync	Package / Case	Function	Frequency - Switching (Min)	Frequency - Switching (Max)	Duty Cycle (Max)	Package Width	Package Name	Package Length	Control Features	Topology	Operating Temperature (Max)	Operating Temperature (Min)	Output Phases	Synchronous Rectifier	Output Configuration	Number of Outputs	Output Type	Voltage - Supply (Vcc/Vdd) Maximum	Voltage - Supply (Vcc/Vdd) Minimum	Package Features
Analog Devices Inc./Maxim Integrated LTC3775IUD#PBF	Surface Mount	Yes	16-WFQFN Exposed Pad	Step-Down	250 kHz	1 MHz	90 %	3 mm	16-QFN	3 mm	Current Limit Enable Frequency Control Soft Start	Buck	125 °C	-40 °C	1	Yes	Positive	1	Transistor Driver	38 V	4.5 V
Analog Devices Inc./Maxim Integrated LTC3775IMSE#TRPBF	Surface Mount	Yes		Step-Down	250 kHz	1 MHz	90 %	3 mm	16-MSOP-EP 16-TFSOP	0.118 in	Current Limit Enable Frequency Control Soft Start	Buck	125 °C	-40 °C	1	Yes	Positive	1	Transistor Driver	38 V	4.5 V	Exposed Pad
Analog Devices Inc./Maxim Integrated LTC3775EMSE#PBF	Surface Mount	Yes		Step-Down	250 kHz	1 MHz	90 %	3 mm	16-MSOP-EP 16-TFSOP	0.118 in	Current Limit Enable Frequency Control Soft Start	Buck	85 °C	-40 °C	1	Yes	Positive	1	Transistor Driver	38 V	4.5 V	Exposed Pad
Analog Devices Inc./Maxim Integrated LTC3775EUD#TRPBF	Surface Mount	Yes	16-WFQFN Exposed Pad	Step-Down	250 kHz	1 MHz	90 %	3 mm	16-QFN	3 mm	Current Limit Enable Frequency Control Soft Start	Buck	85 °C	-40 °C	1	Yes	Positive	1	Transistor Driver	38 V	4.5 V
Analog Devices Inc./Maxim Integrated LTC3775EMSE#TRPBF	Surface Mount	Yes		Step-Down	250 kHz	1 MHz	90 %	3 mm	16-MSOP-EP 16-TFSOP	0.118 in	Current Limit Enable Frequency Control Soft Start	Buck	85 °C	-40 °C	1	Yes	Positive	1	Transistor Driver	38 V	4.5 V	Exposed Pad
Analog Devices Inc./Maxim Integrated LTC3775IUD#TRPBF	Surface Mount	Yes	16-WFQFN Exposed Pad	Step-Down	250 kHz	1 MHz	90 %	3 mm	16-QFN	3 mm	Current Limit Enable Frequency Control Soft Start	Buck	125 °C	-40 °C	1	Yes	Positive	1	Transistor Driver	38 V	4.5 V
Analog Devices Inc./Maxim Integrated LTC3775IUD#PBF	Surface Mount	Yes	16-WFQFN Exposed Pad	Step-Down	250 kHz	1 MHz	90 %	3 mm	16-QFN	3 mm	Current Limit Enable Frequency Control Soft Start	Buck	125 °C	-40 °C	1	Yes	Positive	1	Transistor Driver	38 V	4.5 V
Analog Devices Inc./Maxim Integrated LTC3775IMSE#PBF	Surface Mount	Yes		Step-Down	250 kHz	1 MHz	90 %	3 mm	16-MSOP-EP 16-TFSOP	0.118 in	Current Limit Enable Frequency Control Soft Start	Buck	125 °C	-40 °C	1	Yes	Positive	1	Transistor Driver	38 V	4.5 V	Exposed Pad
Analog Devices Inc./Maxim Integrated LTC3775EUD#PBF	Surface Mount	Yes	16-WFQFN Exposed Pad	Step-Down	250 kHz	1 MHz	90 %	3 mm	16-QFN	3 mm	Current Limit Enable Frequency Control Soft Start	Buck	85 °C	-40 °C	1	Yes	Positive	1	Transistor Driver	38 V	4.5 V

Pricing

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CAD

3D models and CAD resources for this part

Documents

Technical documentation and resources

LTC3775IUD#TRPBF | Datasheet

Tape and Reel Packaging

R526 Reliability Data