LTC3621 Series

17V, 1A Synchronous Step-Down Regulator with 3.5μA Quiescent Current

Catalog

17V, 1A Synchronous Step-Down Regulator with 3.5μA Quiescent Current

Part	Topology	Voltage - Input (Min) [Min]	Operating Temperature [Min]	Operating Temperature [Max]	Number of Outputs	Output Type	Voltage - Output (Min/Fixed)	Frequency - Switching	Voltage - Input (Max) [Max]	Function	Output Configuration	Current - Output	Supplier Device Package	Mounting Type	Package / Case	Package / Case [custom]	Voltage - Output (Max) [Max]	Output Type
Analog Devices LTC3621IDCB-3.3#TRMPBF	Buck	2.7 V	-40 °C	125 ¯C	1	1.81 mOhm	3.3 V	1 MHz	17 V	Step-Down	Positive	1 A	6-DFN (2x3)	Surface Mount	6-WFDFN Exposed Pad
Analog Devices LTC3621IMS8E-3.3#TRPBF	Buck	2.7 V	-40 °C	125 ¯C	1	1.81 mOhm	3.3 V	1 MHz	17 V	Step-Down	Positive	1 A	8-MSOP-EP	Surface Mount	8-MSOP 8-TSSOP Exposed Pad	0.118 in 3 mm
Analog Devices LTC3621HMS8E#TRPBF	Buck	2.7 V	-40 °C	150 °C	1		0.6 V	1 MHz	17 V	Step-Down	Positive	1 A	8-MSOP-EP	Surface Mount	8-MSOP 8-TSSOP Exposed Pad	0.118 in 3 mm	17 V	Adjustable
Analog Devices LTC3621HMS8E-2#PBF	Buck	2.7 V	-40 °C	150 °C	1		0.6 V	2.25 MHz	17 V	Step-Down	Positive	1 A	8-MSOP-EP	Surface Mount	8-MSOP 8-TSSOP Exposed Pad	0.118 in 3 mm	17 V	Adjustable
Analog Devices LTC3621HMS8E-23.3#PBF	Buck	2.7 V	-40 °C	150 °C	1	1.81 mOhm	3.3 V	2.25 MHz	17 V	Step-Down	Positive	1 A	8-MSOP-EP	Surface Mount	8-MSOP 8-TSSOP Exposed Pad	0.118 in 3 mm
Analog Devices LTC3621EMS8E#PBF	Buck	2.7 V	-40 °C	125 ¯C	1		0.6 V	1 MHz	17 V	Step-Down	Positive	1 A	8-MSOP-EP	Surface Mount	8-MSOP 8-TSSOP Exposed Pad	0.118 in 3 mm	17 V	Adjustable
Analog Devices LTC3621HMS8E-3.3#PBF	Buck	2.7 V	-40 °C	150 °C	1	1.81 mOhm	3.3 V	1 MHz	17 V	Step-Down	Positive	1 A	8-MSOP-EP	Surface Mount	8-MSOP 8-TSSOP Exposed Pad	0.118 in 3 mm
Analog Devices LTC3621EMS8E-23.3#TRPBF	Buck	2.7 V	-40 °C	125 ¯C	1	1.81 mOhm	3.3 V	2.25 MHz	17 V	Step-Down	Positive	1 A	8-MSOP-EP	Surface Mount	8-MSOP 8-TSSOP Exposed Pad	0.118 in 3 mm
Analog Devices LTC3621EDCB-23.3#TRMPBF	Buck	2.7 V	-40 °C	125 ¯C	1	1.81 mOhm	3.3 V	2.25 MHz	17 V	Step-Down	Positive	1 A	6-DFN (2x3)	Surface Mount	6-WFDFN Exposed Pad
Analog Devices LTC3621EDCB#TRMPBF	Buck	2.7 V	-40 °C	125 ¯C	1		0.6 V	1 MHz	17 V	Step-Down	Positive	1 A	6-DFN (2x3)	Surface Mount	6-WFDFN Exposed Pad		17 V	Adjustable

Catalog

17V, 1A Synchronous Step-Down Regulator with 3.5μA Quiescent Current

Key Features

• Wide VINRange: 2.7V to 17V

• Wide VOUTRange: 0.6V to VIN

• 95% Max Efficiency

• Low IQ< 3.5μA, Zero-Current Shutdown

• Constant Frequency (1MHz/2.25MHz)

• Full Dropout Operation with Low IQ

• 1A Rated Output Current

• ±1% Output Voltage Accuracy

• Current Mode Operation for Excellent Line and Load Transient Response

• Synchronizable to External Clock

• Pulse-Skipping, Forced Continuous, Burst Mode®Operation

• Internal Compensation and Soft-Start

• Overtemperature Protection

• Compact 6-Lead DFN (2mm × 3mm) Package or Thermally-Enhanced MS8E Package with Power Good Output and Independent SGND Pin

• AEC-Q100 Qualified for Automotive Applications

Description

The LTC3621/LTC3621-2 is a high efficiency 17V, 1A synchronous monolithic step-down regulator. The switching frequency is fixed to 1MHz or 2.25MHz with a ±40% synchronizing range. The regulator features ultralow quiescent current and high efficiencies over a wide VOUTrange.The step-down regulator operates from an input voltage range of 2.7V to 17V and provides an adjustable output range from 0.6V to VINwhile delivering up to 1A of output current. A user-selectable mode input is provided to allow the user to trade off ripple noise for light load efficiency; Burst Mode operation provides the highest efficiency at light loads, while pulse-skipping mode provides the lowest voltage ripple. The MODE pin can also be used to allow the user to sync the switching frequency to an external clock.LTC3621 OptionsPart NameFrequencyVOUTLTC36211.00MHzAdjustableLTC3621-3.31.00MHz3.3VLTC3621-51.00MHz5VLTC3621-22.25MHzAdjustableLTC3621-23.32.25MHz3.3LTC3621-252.25MHz5VAPPLICATIONSPortable-Handheld ScannersIndustrial and Embedded ComputingAutomotive ApplicationsEmergency Radio