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LTC3646/LTC3646-1 - 40V, 1A Synchronous Step-Down Converter

Features

  • Wide Input Voltage Range: 4.0V to 40V
  • 1A Guaranteed Output Current
  • High Efficiency: Up to 95%
  • Wide Output Voltage Range
    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

Typical Application

LTC3646 Typical Application
LTC3646 Typical Application

Description

The LTC®3646 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 overvoltage. The frequency may be set between 200kHz to 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.

Packaging

For complete and up to date package information and drawings, please refer to our packaging page

DFN-14, MS-16

LTC3646 Package Drawing
LTC3646 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC3646EDE DFN 14 E View
LTC3646EDE#PBF DFN 14 E $4.07 $2.85 View
LTC3646EDE#TRPBF DFN 14 E $2.91 View
LTC3646EDE-1#PBF DFN 14 E $4.07 $2.85 View
LTC3646EDE-1#TRPBF DFN 14 E $2.91 View
LTC3646EMSE#PBF MSOP 16 E $4.07 $2.85 View
LTC3646EMSE#TRPBF MSOP 16 E $2.91 View
LTC3646EMSE-1#PBF MSOP 16 E $4.07 $2.85 View
LTC3646EMSE-1#TRPBF MSOP 16 E $2.91 View
LTC3646HDE#PBF DFN 14 H $4.84 $3.39 View
LTC3646HDE#TRPBF DFN 14 H $3.45 View
LTC3646HDE-1#PBF DFN 14 H $4.84 $3.39 View
LTC3646HDE-1#TRPBF DFN 14 H $3.45 View
LTC3646HMSE#PBF MSOP 16 H $4.84 $3.39 View
LTC3646HMSE#TRPBF MSOP 16 H $3.45 View
LTC3646HMSE-1#PBF MSOP 16 H $4.84 $3.39 View
LTC3646HMSE-1#TRPBF MSOP 16 H $3.45 View
LTC3646IDE#PBF DFN 14 I $4.49 $3.14 View
LTC3646IDE#TRPBF DFN 14 I $3.20 View
LTC3646IDE-1#PBF DFN 14 I $4.49 $3.14 View
LTC3646IDE-1#TRPBF DFN 14 I $3.20 View
LTC3646IMSE#PBF MSOP 16 I $4.49 $3.14 View
LTC3646IMSE#TRPBF MSOP 16 I $3.20 View
LTC3646IMSE-1#PBF MSOP 16 I $4.49 $3.14 View
LTC3646IMSE-1#TRPBF MSOP 16 I $3.20 View
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC1731A-A LTC3646/LTC3646-1 Demo Board I High Efficiency Low Quiescent Current Step-Down Converter $150.00
DC1731A-B LTC3646/LTC3646-1 Demo Board I High Efficiency Low Quiescent Current Step-Down Converter $150.00
DC1820A-A LTC3646/LTC3646-1 High Efficiency Low Quiescent Current Step-Down Converter Contact Factory
DC1820A-B LTC3646/LTC3646-1 High Efficiency Low Quiescent Current Step-Down Converter Contact Factory
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Click here to view our complete list of demo boards

Applications

  • Point of Load Power Supply
  • Intermediate Bus Power
  • Automotive Applications

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Related models available in LTspice IV
LTC3646-1
LTC3646

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