LTC3646
LTC3646-1

PRODUCTION

40V, 1A Synchronous Step-Down Converter

Data Sheet Product Selection Table
Part Models
24
1ku List Price
Starting From $3.42
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Part Details

  • 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
LTC3646
LTC3646-1
40V, 1A Synchronous Step-Down Converter
Efficiency Curve Product Package 1 Product Package 2
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 2

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
High Voltage Hot Swap Controllers 1
LTC4364
RECOMMENDED FOR NEW DESIGNS Surge Stopper with Ideal Diode
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Tools & Simulations

LTspice 3

Models for the following parts are available in LTspice:

  • LTC3646
  • LTC3646-1

LTpowerCAD 4

LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

LTpowerCAD

LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.

Evaluation Kits

eval board
schematic 1
DC1731A-B

LTC3646-1 Demo Board (DFN) | 4V ≤ VIN ≤ 40V, VOUT = 3.3V or 5V @ 1A

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Product Details

Demonstration circuit 1731A-B is a DC/DC converter demo board using the LTC3646-1 monolithic synchronous buck regulator in the DFN package. The input voltage range is from 4V to 40V. The output voltage range of LTC3646-1 is 0.6V to 15V. It can deliver up to 1A of output current. At light load conditions, DC1731A can operate in Burst Mode® operation to improve the efficiency. The user can choose to use internal or external compensation. The switching frequency of LTC3646-1 is programmable from 200kHz to 3MHz. It can be synchronized to an external clock through the MODE/SYNC pin.

eval board
schematic 2
schematic 3
DC1820A-B

LTC3646-1 Demo Board (MSOP) | 4V ≤ VIN ≤ 40V, VOUT= 3.3V or 5V @ 1A

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Product Details

Demonstration circuit 1820A-A/1820A-B is a step-down DC/DC converter using LTC3646/LTC3646-1 monolithic synchronous buck regulator. The input voltage range is from 4V to 40V. The output voltage range of LTC3646 is 2V to 30V, for LTC3646-1 is 0.6V to 15V. It can deliver up to 1A of output current. At light load conditions, DC1820A can operate in Burst Mode® operation to improve the efficiency. The user can choose to use internal or external compensation. The switching frequency of LTC3646/LTC3646-1 is programmable from 200kHz to 3MHz. It can be synchronized to an external clock through the MODE/ SYNC pin. The LTC3646/LTC3646-1 data sheet must be read in conjunction with this demo manual prior to working on or modifying demonstration circuit 1820A.

eval board
schematic 4
DC1820A-A

LTC3646 Demo Board (MSOP) | 4V ≤ VIN ≤ 40V, VOUT = 3.3V or 5V @ 1A

Buy Now View Details

Product Details

Demonstration circuit 1820A-A/1820A-B is a step-down DC/DC converter using LTC3646/LTC3646-1 monolithic synchronous buck regulator. The input voltage range is from 4V to 40V. The output voltage range of LTC3646 is 2V to 30V, for LTC3646-1 is 0.6V to 15V. It can deliver up to 1A of output current. At light load conditions, DC1820A can operate in Burst Mode® operation to improve the efficiency. The user can choose to use internal or external compensation. The switching frequency of LTC3646/LTC3646-1 is programmable from 200kHz to 3MHz. It can be synchronized to an external clock through the MODE/ SYNC pin. The LTC3646/LTC3646-1 data sheet must be read in conjunction with this demo manual prior to working on or modifying demonstration circuit 1820A.

eval board
schematic 5
DC1731A-A

LTC3646 Demo Board (DFN) | 4V ≤ VIN ≤ 40V, VOUT = 3.3V or 5V @ 1A

Buy Now View Details

Product Details

Demonstration circuit 1731A-A is a DC/DC converter demo board using the LTC3646 monolithic synchronous buck regulator in the DFN package. The input voltage range is from 4V to 40V. The output voltage range of LTC3646 is 2V to 30V. It can deliver up to 1A of output current. At light load conditions, DC1731A can operate in Burst Mode® operation to improve the efficiency. The user can choose to use internal or external compensation. The switching frequency of LTC3646 is programmable from 200kHz to 3MHz. It can be synchronized to an external clock through the MODE/SYNC pin.
DC1731A-B
LTC3646-1 Demo Board (DFN) | 4V ≤ VIN ≤ 40V, VOUT = 3.3V or 5V @ 1A
DC1731A-A - Schematic
DC1820A-B
LTC3646-1 Demo Board (MSOP) | 4V ≤ VIN ≤ 40V, VOUT= 3.3V or 5V @ 1A
DC1820A-B diagram DC1820A-A - Schematic
DC1820A-A
LTC3646 Demo Board (MSOP) | 4V ≤ VIN ≤ 40V, VOUT = 3.3V or 5V @ 1A
DC1820A-A - Schematic
DC1731A-A
LTC3646 Demo Board (DFN) | 4V ≤ VIN ≤ 40V, VOUT = 3.3V or 5V @ 1A
DC1731A-A - Schematic

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