LTC3621

RECOMMENDED FOR NEW DESIGNS

LTC3621

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

RECOMMENDED FOR NEW DESIGNS

LTC3621/LTC3621-2 Application Circuit slide

LTC3621/LTC3621-2 Pin Configuration slide

LTC3621/LTC3621-2 Performance Graph slide

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Part Models 96

1ku List Price Starting From $3.06

Features

Wide V_IN Range: 2.7V to 17V
Wide V_OUT Range: 0.6V to V_IN
95% Max Efficiency
Low I_Q < 3.5μA, Zero-Current Shutdown
Constant Frequency (1MHz/2.25MHz)
Full Dropout Operation with Low I_Q
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

Additional Details

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 V_OUT range.

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 V_IN while 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 Options
Part Name	Frequency	V_OUT
LTC3621	1.00MHz	Adjustable
LTC3621-3.3	1.00MHz	3.3V
LTC3621-5	1.00MHz	5V
LTC3621-2	2.25MHz	Adjustable
LTC3621-23.3	2.25MHz	3.3
LTC3621-25	2.25MHz	5V

APPLICATIONS

Portable-Handheld Scanners
Industrial and Embedded Computing
Automotive Applications
Emergency Radio

View All Documentation

Ask a Question

Submit your question below and we will return the best answer from ADI’s knowledge database:

Other places you can find help

Support

Analog Devices Support Portal is a one-stop shop to answer all your ADI questions.

Visit the ADI Support Page

Ask the ADI community for help.

Ask the EngineerZone Community

FAQs

Sales & Ordering FAQs

Part Models 96

1ku List Price Starting From $3.06

Technical Documents 4

LTC3621/LTC3621-2: 17V, 1A Synchronous Step-Down Regulator with 3.5μA Quiescent Current Data Sheet (Rev.D) 04/27/2015

R539 Reliability Data 03/26/2018

DC1864A - Demo Board Manual 12/20/2013

DC1863A - Demo Manual 10/28/2013

Design Resources 96

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC3621EDCB#TRMPBF	6-Lead DFN (2mm x 3mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621EDCB#TRPBF	6-Lead DFN (2mm x 3mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621EDCB-2#TRMPBF	6-Lead DFN (2mm x 3mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621EDCB-2#TRPBF	6-Lead DFN (2mm x 3mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621EDCB-23.3#TRMPBF	6-Lead DFN (2mm x 3mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621EDCB-23.3#TRPBF	6-Lead DFN (2mm x 3mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621EDCB-25#TRMPBF	6-Lead DFN (2mm x 3mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621EDCB-25#TRPBF	6-Lead DFN (2mm x 3mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621EDCB-3.3#TRMPBF	6-Lead DFN (2mm x 3mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621EDCB-3.3#TRPBF	6-Lead DFN (2mm x 3mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621EDCB-5#TRMPBF	6-Lead DFN (2mm x 3mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621EDCB-5#TRPBF	6-Lead DFN (2mm x 3mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621EMS8E#PBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621EMS8E#TRPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621EMS8E#WPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621EMS8E#WTRPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621EMS8E-2#PBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621EMS8E-2#TRPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621EMS8E-2#WPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621EMS8E-2#WTRPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621EMS8E-23.3#PBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621EMS8E-23.3#TRPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621EMS8E-23.3#WPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621EMS8E-23.3#WTRPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621EMS8E-25#PBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621EMS8E-25#TRPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621EMS8E-25#WPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621EMS8E-25#WTRPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621EMS8E-3.3#PBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621EMS8E-3.3#TRPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621EMS8E-3.3#WPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621EMS8E-3.3#WTRPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621EMS8E-5#PBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621EMS8E-5#TRPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621EMS8E-5#WPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621EMS8E-5#WTRPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621HMS8E#PBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621HMS8E#TRPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621HMS8E#WPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621HMS8E#WTRPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621HMS8E-2#PBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621HMS8E-2#TRPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621HMS8E-2#WPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621HMS8E-2#WTRPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621HMS8E-23.3#PBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621HMS8E-23.3#TRPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621HMS8E-23.3#WPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621HMS8E-23.3#WTRPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621HMS8E-25#PBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621HMS8E-25#TRPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621HMS8E-25#WPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621HMS8E-25#WTRPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621HMS8E-3.3#PBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621HMS8E-3.3#TRPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621HMS8E-3.3#WPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621HMS8E-3.3#WTRPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621HMS8E-5#PBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621HMS8E-5#TRPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621HMS8E-5#WPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621HMS8E-5#WTRPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621IDCB#TRMPBF	6-Lead DFN (2mm x 3mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621IDCB#TRPBF	6-Lead DFN (2mm x 3mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621IDCB-2#TRMPBF	6-Lead DFN (2mm x 3mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621IDCB-2#TRPBF	6-Lead DFN (2mm x 3mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621IDCB-23.3#TRMPBF	6-Lead DFN (2mm x 3mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621IDCB-23.3#TRPBF	6-Lead DFN (2mm x 3mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621IDCB-25#TRMPBF	6-Lead DFN (2mm x 3mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621IDCB-25#TRPBF	6-Lead DFN (2mm x 3mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621IDCB-3.3#TRMPBF	6-Lead DFN (2mm x 3mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621IDCB-3.3#TRPBF	6-Lead DFN (2mm x 3mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621IDCB-5#TRMPBF	6-Lead DFN (2mm x 3mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621IDCB-5#TRPBF	6-Lead DFN (2mm x 3mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621IMS8E#PBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621IMS8E#TRPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621IMS8E#WPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621IMS8E#WTRPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621IMS8E-2#PBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621IMS8E-2#TRPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621IMS8E-2#WPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621IMS8E-2#WTRPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621IMS8E-23.3#PBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621IMS8E-23.3#TRPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621IMS8E-23.3#WPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621IMS8E-23.3#WTRPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621IMS8E-25#PBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621IMS8E-25#TRPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621IMS8E-25#WPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621IMS8E-25#WTRPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621IMS8E-3.3#PBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621IMS8E-3.3#TRPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621IMS8E-3.3#WPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621IMS8E-3.3#WTRPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621IMS8E-5#PBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621IMS8E-5#TRPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621IMS8E-5#WPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3621IMS8E-5#WTRPBF	8-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys