LTC3621 - 17V, 1A Synchronous Step-Down Regulator with 3.5μA Quiescent Current

The LTC®3621/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 VOUT 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 VIN 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

Features
  • Wide VIN Range: 2.7V to 17V
  • Wide VOUT Range: 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
Typical Application

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

Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LTC3621EDCB-2#PBF2x3 DFN-6E$3.64
LTC3621EDCB-2#TRMPBF2x3 DFN-6E$3.64$2.60
LTC3621EDCB-2#TRPBF2x3 DFN-6E$3.64$2.55
LTC3621EDCB-23.3#PBF2x3 DFN-6E$3.64
LTC3621EDCB-23.3#TRMPBF2x3 DFN-6E$3.64$2.60
LTC3621EDCB-23.3#TRPBF2x3 DFN-6E$3.64$2.55
LTC3621EDCB-25#PBF2x3 DFN-6E$3.64
LTC3621EDCB-25#TRMPBF2x3 DFN-6E$3.64$2.60
LTC3621EDCB-25#TRPBF2x3 DFN-6E$3.64$2.55
LTC3621EDCB-3.3#PBF2x3 DFN-6E$3.64
LTC3621EDCB-3.3#TRMPBF2x3 DFN-6E$3.64$2.60
LTC3621EDCB-3.3#TRPBF2x3 DFN-6E$3.64$2.55
LTC3621EDCB-5#PBF2x3 DFN-6E$3.64
LTC3621EDCB-5#TRMPBF2x3 DFN-6E$3.64$2.60
LTC3621EDCB-5#TRPBF2x3 DFN-6E$3.64$2.55
LTC3621EDCB#PBF2x3 DFN-6E$3.64
LTC3621EDCB#TRMPBF2x3 DFN-6E$3.64$2.60
LTC3621EDCB#TRPBF2x3 DFN-6E$3.64$2.55
LTC3621EMS8E-2#PBFMS-8E$3.64$2.55
LTC3621EMS8E-2#TRPBFMS-8E$2.61
LTC3621EMS8E-23.3#PBFMS-8E$3.64$2.55
LTC3621EMS8E-23.3#TRPBFMS-8E$2.61
LTC3621EMS8E-25#PBFMS-8E$3.64$2.55
LTC3621EMS8E-25#TRPBFMS-8E$2.61
LTC3621EMS8E-3.3#PBFMS-8E$3.64$2.55
LTC3621EMS8E-3.3#TRPBFMS-8E$2.61
LTC3621EMS8E-5#PBFMS-8E$3.64$2.55
LTC3621EMS8E-5#TRPBFMS-8E$2.61
LTC3621EMS8E#PBFMS-8E$3.64$2.55
LTC3621EMS8E#TRPBFMS-8E$2.61
LTC3621HMS8E-2#PBFMS-8H$4.37$3.06
LTC3621HMS8E-2#TRPBFMS-8H$3.12
LTC3621HMS8E-23.3#PBFMS-8H$4.37$3.06
LTC3621HMS8E-23.3#TRPBFMS-8H$3.12
LTC3621HMS8E-25#PBFMS-8H$4.37$3.06
LTC3621HMS8E-25#TRPBFMS-8H$3.12
LTC3621HMS8E-3.3#PBFMS-8H$4.37$3.06
LTC3621HMS8E-3.3#TRPBFMS-8H$3.12
LTC3621HMS8E-5#PBFMS-8H$4.37$3.06
LTC3621HMS8E-5#TRPBFMS-8H$3.12
LTC3621HMS8E#PBFMS-8H$4.37$3.06
LTC3621HMS8E#TRPBFMS-8H$3.12
LTC3621IDCB-2#PBF2x3 DFN-6I$4.02
LTC3621IDCB-2#TRMPBF2x3 DFN-6I$4.02$2.86
LTC3621IDCB-2#TRPBF2x3 DFN-6I$4.02$2.81
LTC3621IDCB-23.3#PBF2x3 DFN-6I$4.02
LTC3621IDCB-23.3#TRMPBF2x3 DFN-6I$4.02$2.86
LTC3621IDCB-23.3#TRPBF2x3 DFN-6I$4.02$2.81
LTC3621IDCB-25#PBF2x3 DFN-6I$4.02
LTC3621IDCB-25#TRMPBF2x3 DFN-6I$4.02$2.86
LTC3621IDCB-25#TRPBF2x3 DFN-6I$4.02$2.81
LTC3621IDCB-3.3#PBF2x3 DFN-6I$4.02
LTC3621IDCB-3.3#TRMPBF2x3 DFN-6I$4.02$2.86
LTC3621IDCB-3.3#TRPBF2x3 DFN-6I$4.02$2.81
LTC3621IDCB-5#PBF2x3 DFN-6I$4.02
LTC3621IDCB-5#TRMPBF2x3 DFN-6I$4.02$2.86
LTC3621IDCB-5#TRPBF2x3 DFN-6I$4.02$2.81
LTC3621IDCB#PBF2x3 DFN-6I$4.02
LTC3621IDCB#TRMPBF2x3 DFN-6I$4.02$2.86
LTC3621IDCB#TRPBF2x3 DFN-6I$4.02$2.81
LTC3621IMS8E-2#PBFMS-8I$4.02$2.81
LTC3621IMS8E-2#TRPBFMS-8I$2.87
LTC3621IMS8E-23.3#PBFMS-8I$4.02$2.81
LTC3621IMS8E-23.3#TRPBFMS-8I$2.87
LTC3621IMS8E-25#PBFMS-8I$4.02$2.81
LTC3621IMS8E-25#TRPBFMS-8I$2.87
LTC3621IMS8E-3.3#PBFMS-8I$4.02$2.81
LTC3621IMS8E-3.3#TRPBFMS-8I$2.87
LTC3621IMS8E-5#PBFMS-8I$4.02$2.81
LTC3621IMS8E-5#TRPBFMS-8I$2.87
LTC3621IMS8E#PBFMS-8I$4.02$2.81
LTC3621IMS8E#TRPBFMS-8I$2.87
Demo Boards
Part NumberDescriptionPrice
DC1863ALTC3621 Demo Board | 1MHz, 2.7V ≤ VIN ≤ 17V, Vout = 1.2V/1.8V/2.5V/3.3V/5V/Adj @ 1A$100.00
DC1864ALTC3621-2 Demo Board | 2.25MHz, 2.7V ≤ VIN ≤ 17V, Vout = 1.2V/1.8V/2.5V/3.3V/5V/Adj @ 1A$100.00
Datasheet
Reliability Data
Press Release
LTspice
LTpowerCAD
Related Product
LTC3621/LTC3621-2 - 17V, 1A Synchronous Step-Down Regulator with 3.5μA Quiescent Current
LTC3621 Package Drawing LTC3621
R539 - Reliability Data
17V, 2.25MHz, Synchronous Step-Down Regulator Delivers 1A & Requires Only 3.5µA of Quiescent Current
LTC3621 Footprints and Symbols
LTC3621 Demo Circuit - 17V, 1A, 1MHz Monolithic Synchronous Buck Regulator (2.7-17V to 1.2V @ 1A)
LTC3621-2 Demo Circuit - 17V, 1A, 2.25MHz Monolithic Synchronous Buck Regulator (2.7-17V to 1.2V @ 1A)
LTC3621 Project - 1A, 17V, 2.25MHz Buck Regulator (2.7-17V to 2.5V @ 1A)
LTC3621 Project - 1A, 17V, 2.25MHz Buck Regulator (5-17V to 5V @ 1A)
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