LTC3649

RECOMMENDED FOR NEW DESIGNS

60V, 4A Synchronous Step-Down Regulator with Rail-to-Rail Programmable Output

Data Sheet
Part Models
8
1ku List Price
Starting From $6.72
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Part Details

  • Wide VIN Range: 3.1V to 60V
  • Wide VOUT Range: 0V to (VIN – 0.5V)
  • Single Resistor VOUT Programming
  • Integrated 110mΩ Top N-Channel/50mΩ Bottom N-Channel MOSFETs
  • 95% Efficiency with 12VIN and 5VOUT
  • Regulated IQ: 440μA, Shutdown IQ: 18μA
  • Accurate Current Monitoring (±4%) without Sense Resistor
  • Accurate Resistor Programmable Frequency (300kHz to 3MHz) with ±50% Frequency Sync Range
  • Accurate Programmable Output Current
  • Input Voltage Regulation for MPPT Applications
  • ±0.8% Output Voltage Accuracy
  • Peak Current Mode Operation
  • Programmable Wire Drop Compensation
  • Burst Mode® Operation, Forced Continuous Mode
  • Internal Compensation and Programmable Soft-Start
  • Overtemperature Protection
  • Available in Thermally Enhanced 28-Lead (4mm × 5mm) QFN and TSSOP Packages
LTC3649
60V, 4A Synchronous Step-Down Regulator with Rail-to-Rail Programmable Output
24V to 5VOUT Burst Mode Operation Efficiency with VOUT = 5V Product Package 1 Product Package 2
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 2

Design Note 3

Technical Articles 2

Data Sheet

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

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Hardware Ecosystem

Parts Product Life Cycle Description
Circuit Monitors 1
LT4363
RECOMMENDED FOR NEW DESIGNS High Voltage Surge Stopper with Current Limit
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Tools & Simulations

LTspice 6

Models for the following parts are available in LTspice:

  • LTC3649

LTpowerCAD 1

Design tools for the following parts are available in LTpowerCAD:

  • LTC3649
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
schematic 2
schematic 3
schematic 4
schematic 5
DC2113A

LTC3649 Demo Board | Synchronous Buck, 3.1V ≤ VIN ≤ 60V, VOUT = 3.3V/5V @ 4A

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Product Details

Demonstration circuit 2113A is a high input voltage, high efficiency synchronous monolithic buck converter featuring the LTC3649. The DC2113A has wide input voltage range from 3.1V up to 60V. The output voltage of the DC2113A can be set as to 3.3V or 5V. However, “USER SELECT” option of DC2113A allows output voltage to be as high as input voltage minus 0.5V, with certain modifications. DC2113A is capable of delivering up to 4A of output current. DC2113A supports three operation modes: Fixed-Frequency modulation, Burst Mode® operation and the user can synchronize it with external clock also. Fixed-Frequency mode of operation maximizes the output current, reduces output voltage ripple, and yields a low noise switching spectrum. Burst Mode operation employs a variable frequency switching algorithm that minimizes the no-load input quiescent current and improves efficiency at light loads.

eval board
schematic 6
DC2112A

LTC3649EUFD Demo Board | 4V ≤ VIN ≤ 60V; VOUT = 3.3V or 5V @ 4A

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Product Details

Demonstration circuit 2112A is a high input voltage, high efficiency synchronous monolithic buck converter featuring the LTC3649 in a 28-lead UFD package. The DC2112A has wide input voltage range from 3.1V up to 60V. The output voltage of the DC2112A can be set as to 3.3V or 5V. However, the “USER SELECT” option of DC2112A allows output voltage to be as high as input voltage minus 0.5V, with certain modifications. DC2112A is capable of delivering up to 4A of output current. DC2112A supports three operation modes: Fixed-Frequency modulation and Burst Mode, user can synchronize it with an external clock also. Fixed-Frequency mode of operation maximizes the output current, reduces output voltage ripple, and yields a low noise switching spectrum. Burst Mode employs a variable frequency switching algorithm that minimizes the no-load input quiescent current and improves efficiency at light loads.


 
DC2113A
LTC3649 Demo Board | Synchronous Buck, 3.1V ≤ VIN ≤ 60V, VOUT = 3.3V/5V @ 4A
DC2113A Demo Board DC2113A Demo Board DC2113A Demo Board DC2113A Demo Board DC2113A - Schematic
DC2112A
LTC3649EUFD Demo Board | 4V ≤ VIN ≤ 60V; VOUT = 3.3V or 5V @ 4A
DC2112A

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