LT8641
Info : RECOMMENDED FOR NEW DESIGNS
searchIcon
cartIcon

LT8641

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

Show More showmore-icon

Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 12
1ku List Price Starting From $5.19
Features
  • 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
Additional Details
show more Icon

The LT8641 step-down regulator features Silent Switcher architecture designed to minimize EMI/EMC emissions while delivering high efficiency at frequencies up to 3MHz. Assembled in a 3mm × 4mm QFN, the monolithic construction with integrated power switches and inclusion of all necessary circuitry yields a solution with a minimal PCB footprint. An ultralow 2.5μA quiescent current—with the output in full regulation—enables applications requiring highest efficiency at very small load currents. Transient response remains excellent and output voltage ripple is below 10mVP-P at any load, from zero to full current.

The LT8641 allows high VIN to low VOUT conversion at high frequency with a fast minimum top switch on-time of 35ns. Operation is safe in overload even with a saturated inductor.

Essential features are included and easy to use: An open-drain PG pin signals when the output is in regulation. The SYNC/MODE pin selects between Burst Mode, pulse-skipping, or spread spectrum mode, and also allows synchronization to an external clock. Soft-start and tracking functionality is accessed via the TR/SS pin. An accurate enable threshold can be set using the EN/UV pin and a resistor at the RT pin programs switch frequency.

APPLICATIONS

  • Automotive and Industrial Supplies
  • General Purpose Step-Down
  • GSM Power Supplies
Part Models 12
1ku List Price Starting From $5.19

close icon
Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LT8641EUDC#PBF
  • HTML
  • HTML
LT8641EUDC#TRPBF
  • HTML
  • HTML
LT8641HUDC#PBF
  • HTML
  • HTML
LT8641HUDC#TRPBF
  • HTML
  • HTML
LT8641HUDC#WPBF
  • HTML
  • HTML
LT8641HUDC#WTRPBF
  • HTML
  • HTML
LT8641IUDC#PBF
  • HTML
  • HTML
LT8641IUDC#TRPBF
  • HTML
  • HTML
LT8641IUDC#WPBF
  • HTML
  • HTML
LT8641IUDC#WTRPBF
  • HTML
  • HTML
LT8641JUDC#WPBF
  • HTML
  • HTML
LT8641JUDC#WTRPBF
  • HTML
  • HTML

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Sep 30, 2020

- 20_0293

Test Site Transfer from Analog Devices Singapore to UTAC Thailand

LT8641EUDC#PBF

PRODUCTION

LT8641EUDC#TRPBF

PRODUCTION

LT8641HUDC#PBF

PRODUCTION

LT8641HUDC#TRPBF

PRODUCTION

LT8641IUDC#PBF

PRODUCTION

LT8641IUDC#TRPBF

PRODUCTION

Apr 11, 2019

- 19_0067

Notification of Wafer Fab Location Change for 0.35 BCD Process

LT8641EUDC#PBF

PRODUCTION

LT8641EUDC#TRPBF

PRODUCTION

LT8641HUDC#PBF

PRODUCTION

LT8641HUDC#TRPBF

PRODUCTION

LT8641IUDC#PBF

PRODUCTION

LT8641IUDC#TRPBF

PRODUCTION

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Sep 30, 2020

- 20_0293

arrow down

Test Site Transfer from Analog Devices Singapore to UTAC Thailand

LT8641EUDC#PBF

PRODUCTION

LT8641EUDC#TRPBF

PRODUCTION

LT8641HUDC#PBF

PRODUCTION

LT8641HUDC#TRPBF

PRODUCTION

LT8641IUDC#PBF

PRODUCTION

LT8641IUDC#TRPBF

PRODUCTION

Apr 11, 2019

- 19_0067

arrow down

Notification of Wafer Fab Location Change for 0.35 BCD Process

LT8641EUDC#PBF

PRODUCTION

LT8641EUDC#TRPBF

PRODUCTION

LT8641HUDC#PBF

PRODUCTION

LT8641HUDC#TRPBF

PRODUCTION

LT8641IUDC#PBF

PRODUCTION

LT8641IUDC#TRPBF

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

reference details image

DC2373A

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

zoom

DC2373A

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

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

Product Detail

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.

Tools & Simulations

Tools & Simulations 2

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.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

Recently Viewed