LT8641

RECOMMENDED FOR NEW DESIGNS

65V, 3.5A Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current

Data Sheet (Rev. C) Product Selection Table
Part Models
12
1ku List Price
Starting From $5.19
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Part Details

  • Silent Switcher® Architecture
    • Ultralow EMI Emissions
    • Spread Spectrum Frequency Modulation
  • High Efficiency at High Frequency
    • Up to 95% Efficiency at 1MHz, 12VIN to 5VOUT
    • Up to 94% Efficiency at 2MHz, 12VIN to 5VOUT
  • Wide Input Voltage Range: 3V to 65V
  • 3.5A Maximum Continuous Output, 5A Peak Transient Output
  • Fast Minimum Switch-On Time: 35ns
  • Ultralow Quiescent Current Burst Mode® Operation
    • 2.5μA IQ Regulating 12VIN to 3.3VOUT
    • Output Ripple < 10mVP-P
  • Low Dropout Under All Conditions: 130mV at 1A
  • Safely Tolerates Inductor Saturation in Overload
  • Adjustable and Synchronizable: 200kHz to 3MHz
  • Peak Current Mode Operation
  • Output Soft-Start and Tracking
  • Small 18-Lead 3mm × 4mm QFN
  • AEC-Q100 Qualified for Automotive Applications
LT8641
65V, 3.5A Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current
LT8641 Application Circuit LT8641 Performance Graph LT8641 Pin Configuration
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Technical Articles 2

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Surge Stopper, Overvoltage, and Overcurrent Protection 1
LT4363
RECOMMENDED FOR NEW DESIGNS High Voltage Surge Stopper with Current Limit
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Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

  • LT8641

LTpowerCAD 1

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
DC2373A

LT8641 Demo Board | Synchronous Buck, Silent Switcher, 5.5V ≤ VIN ≤ 65V, VOUT = 5V @ 3.5A, fSW = 2MHz

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Product Details

Demonstration circuit 2373A is a 65V, 3.5A micropower synchronous step-down Silent Switcher® with spread spectrum frequency modulation featuring the LT8641. The demo board is designed for 5V output from a 5.5V to 65V input. The wide input range allows a variety of input sources, such as automotive batteries and industrial supplies. The LT8641 is a compact, ultralow emission, high efficiency, high speed synchronous monolithic step-down switching regulator that consumes only 2.5μA of quiescent current when output is regulated at 5V. Top and bottom power switches, compensation components and other necessary circuits are inside of the LT8641 to minimize external components and simplify design.
DC2373A
LT8641 Demo Board | Synchronous Buck, Silent Switcher, 5.5V ≤ VIN ≤ 65V, VOUT = 5V @ 3.5A, fSW = 2MHz
DC2373A Demo Board DC2373A Demo Board DC2373A Demo Board DC2373A Demo Board DC2373A - Schematic

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