LTC3646LTC3646-1 Series

40V, 1A Synchronous Step-Down Converter

Catalog

40V, 1A Synchronous Step-Down Converter

Part	Voltage - Input (Min) [Min]	Package / Case	Current - Output	Output Configuration	Supplier Device Package	Function	Output Type	Number of Outputs	Voltage - Output (Max) [Max]	Topology	Mounting Type	Operating Temperature [Max]	Operating Temperature [Min]	Voltage - Output (Min/Fixed) [Min]	Frequency - Switching [Min]	Frequency - Switching [Max]	Package / Case	Voltage - Output (Min/Fixed)
Analog Devices LTC3646IDE#PBF	4 V	14-WFDFN Exposed Pad	1 A	Positive	14-DFN (4x3)	Step-Down	Adjustable	1	30 V	Buck	Surface Mount	150 °C	-40 °C	2 V	200 kHz	3 MHz
Analog Devices LTC3646IMSE#TRPBF	4 V	16-TFSOP Exposed Pad	1 A	Positive	16-MSOP-EP	Step-Down	Adjustable	1	30 V	Buck	Surface Mount	150 °C	-40 °C	2 V	200 kHz	3 MHz	0.118 in 3 mm
Analog Devices LTC3646IMSE#PBF	4 V	16-TFSOP Exposed Pad	1 A	Positive	16-MSOP-EP	Step-Down	Adjustable	1	30 V	Buck	Surface Mount	150 °C	-40 °C	2 V	200 kHz	3 MHz	0.118 in 3 mm
Analog Devices LTC3646EMSE#PBF	4 V	16-TFSOP Exposed Pad	1 A	Positive	16-MSOP-EP	Step-Down	Adjustable	1	30 V	Buck	Surface Mount	150 °C	-40 °C	2 V	200 kHz	3 MHz	0.118 in 3 mm
Analog Devices LTC3646IDE-1#TRPBF	4 V	14-WFDFN Exposed Pad	1 A	Positive	14-DFN (4x3)	Step-Down	Adjustable	1		Buck	Surface Mount	150 °C	-40 °C		200 kHz	3 MHz		0.6 V
Analog Devices LTC3646EDE-1	4 V	14-WFDFN Exposed Pad	1 A	Positive	14-DFN (4x3)	Step-Down	Adjustable	1		Buck	Surface Mount	150 °C	-40 °C		200 kHz	3 MHz		0.6 V
Analog Devices LTC3646HMSE#PBF	4 V	16-TFSOP Exposed Pad	1 A	Positive	16-MSOP-EP	Step-Down	Adjustable	1	30 V	Buck	Surface Mount	150 °C	-40 °C	2 V	200 kHz	3 MHz	0.118 in 3 mm
Analog Devices LTC3646HDE#PBF	4 V	14-WFDFN Exposed Pad	1 A	Positive	14-DFN (4x3)	Step-Down	Adjustable	1	30 V	Buck	Surface Mount	150 °C	-40 °C	2 V	200 kHz	3 MHz
Analog Devices LTC3646HDE-1#TRPBF	4 V	14-WFDFN Exposed Pad	1 A	Positive	14-DFN (4x3)	Step-Down	Adjustable	1		Buck	Surface Mount	150 °C	-40 °C		200 kHz	3 MHz		0.6 V
Analog Devices LTC3646IMSE-1#TRPBF	4 V	16-TFSOP Exposed Pad	1 A	Positive	16-MSOP-EP	Step-Down	Adjustable	1		Buck	Surface Mount	150 °C	-40 °C		200 kHz	3 MHz	0.118 in 3 mm	0.6 V

Catalog

40V, 1A Synchronous Step-Down Converter

Key Features

• Wide Input Voltage Range: 4.0V to 40V

• 1A Guaranteed Output Current

• High Efficiency: Up to 95%

• Wide Output Voltage RangeLTC3646: 2.0V to 30VLTC3646-1: 0.6V to 15V

• LTC3646: 2.0V to 30V

• LTC3646-1: 0.6V to 15V

• ±1% Accurate Reference Voltage

• Internal or External Compensation

• Switching Frequency Adjustable and Synchronizable: 200kHz to 3MHz

• Selectable High Efficiency Burst Mode®Operation or Forced Continuous Mode

• 14 Lead 3mm × 4mm DFN or Thermally Enhanced

• 16-Lead MSOP Packages

Description

The LTC3646 is a high efficiency, step-down DC/DC converter with internal high side and synchronous power FETs. It draws only 140μA typical DC supply current in Burst Mode operation at no load while maintaining output voltage regulation.The LTC3646 can supply up to a 1A load, and its combination of Burst Mode operation, integrated power switches and low quiescent current provides high efficiency over a broad range of load currents. Alternatively, it can be used in forced continuous mode for ripple sensitive applications.The LTC3646 has a wide 4.0V to 40V input range and its patented controlled on-time architecture and 0.6V reference voltage allow for large step-down ratios without the risk of output overvoltage. The frequency may be set between 200kHz and 3.0MHz with a program resistor or synchronized to an external clock.The internal soft-start, short-circuit protection and voltage rating make the LTC3646 a robust part ideal for high voltage applications.ApplicationsPoint of Load Power SupplyIntermediate Bus PowerAutomotive Applications