LT8646S
Info : RECOMMENDED FOR NEW DESIGNS
searchIcon
cartIcon

LT8646S

65V, 8A Synchronous Step-Down Silent Switcher 2 with 2.5μA Quiescent Current

Show More showmore-icon

Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Viewing: Part Details
arrow-icon

Not the part you were looking for?

viewall Go to Product Selection Table
file View Data Sheet (Rev.E)
Documentation View All Documentation
LTspice LT8646S - Step-Down (Buck) Regulators Download 2 KB
Part Models 8
1ku List Price Starting From $7.01
Features
  • Silent Switcher®2 Architecture
    • Ultralow EMI Emissions on Any PCB
    • Eliminates PCB Layout Sensitivity
    • Internal Bypass Capacitors Reduce Radiated EMI
    • Optional Spread Spectrum 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: 3.4V to 65V
  • Ultralow Quiescent Current Burst Mode Operation
    • 2.5μA IQ Regulating 12VIN to 3.3VOUT (LT8645S)
    • Output Ripple < 10mVP-P
  • External Compensation: Fast Transient Response and Current Sharing (LT8646S)
  • Fast Minimum Switch On-Time: 40ns
  • Low Dropout Under All Conditions: 60mV at 1A
  • Adjustable and Synchronizable: 200kHz to 2.2MHz
  • Peak Current Mode Operation
  • Output Soft-Start and Tracking
  • Small 32-Lead 6mm × 4mm LQFN Package
  • AEC-Q100 Qualified for Automotive Applications
Additional Details
show more Icon

The LT8645S/LT8646S synchronous step-down regulator features second generation Silent Switcher architecture designed to minimize EMI emissions while delivering high efficiency at high switching frequencies. This includes the integration of bypass capacitors to optimize all the fast current loops inside and make it easy to achieve advertised EMI performance by eliminating layout sensitivity.

The fast, clean, low-overshoot switching edges enable high efficiency operation even at high switching frequencies, leading to a small overall solution size. Peak current mode control with a 40ns minimum on-time allows high step-down ratios even at high switching frequencies. The LT8646S has external compensation to enable current sharing and fast transient response at high switching frequencies.

Burst Mode® operation enables ultralow standby current consumption, pulse-skipping mode allows full switching frequency at lower output loads, or spread spectrum operation can further reduce EMI emissions.

Applications

  • Automotive and Industrial Supplies
  • General Purpose Step-Down
  • GSM Power Supplies
Show More Arrow image
file View Data Sheet (Rev.E)
Documentation View All Documentation
LTspice LT8646S - Step-Down (Buck) Regulators Download 2 KB
Part Models 8
1ku List Price Starting From $7.01
modal bookmark icon

{{modalTitle}}

modal close icon

{{modalDescription}}

{{dropdownTitle}}

input down arrow
  • {{defaultSelectedText}}
    • {{#each projectNames}}
  • {{name}}
    • {{/each}} {{#if newProjectText}}
  • plus icon {{newProjectText}}
    • {{/if}}
{{#if toggleButtonDescription}}
{{toggleButtonDescription}}
{{/if}} {{#if newProjectTitle}}

{{newProjectTitle}}

{{projectNameErrorText}}

{{/if}}

LT8646S

Documentation

7
overlayclose

Filters

1 Applied

mobileoverlaydownarrow
  • All
    TickIcon
  • Data Sheet
  • Reliability Data
  • User Guide
  • Design Note
  • All
    TickIcon
  • English
  • Japanese
  • Chinese
resetfilter

Reset Filters

Data Sheet

2

PDF Vector

PDF

UPDATED 09/03/2024
English

LT8645S/LT8646S: 65V, 8A Synchronous Step-Down Silent Switcher 2 with 2.5μA Quiescent Current Data Sheet (Rev.E)

Open PDF File

redirect
3.25 M
download

Download PDF

PDF Vector

PDF

UPDATED 06/14/2017
Japanese

LT8645S: 静止電流が2.5μAの65V、8A同期整流式降圧Silent Switcher 2 データシート

Open PDF File

redirect
2.00M
download

Download PDF

Reliability Data

1

PDF Vector

PDF

UPDATED 04/13/2020
English
R585 Reliability Data redirect icon

108.22 K

download

Download PDF

User Guide

1

PDF Vector

PDF

UPDATED 03/02/2018
English
DC2660A - Demo Board Manual redirect icon

563.00K

download

Download PDF

Design Note

3

PDF Vector

HTML

UPDATED 09/01/2018
English
Monolithic 65V , 8A Step-Down Regulators with Fast Transient Response and Ultralow EMI Emissions redirect icon

PDF Vector

HTML

UPDATED 09/01/2018
Chinese
具快速瞬态响应和超低 EMI 辐射的单片式 65 V、8 A 降压型稳压器 redirect icon

PDF Vector

HTML

UPDATED 09/01/2018
Japanese
65V入力／8A出力のモノリシック型降圧レギュレータ、高速な過渡応答と極めて高いEMI性能を実現 redirect icon

There are no results matching this criteria. Try resetting your filters or searching for a different term

close icon

Documentation

Solutions Bulletin & Brochure 1

Silent Switcher Technology

Book & eBook 1

Understanding Silent Switcher Technology: High Efficiency, Low EMI eBook

Webcast 1

Improving Switch-Mode Power Supplies Using Noise Cancelling Technology

Video

1

Thumbnail Image

Video

2018-04-08

01:44

Silent Switcher II

Learn More
Show More Arrow image

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LT8646SEV#PBF 32-Lead LQFN (6mm x 4mm x 0.94mm w/ EP) external-link
  • HTML
  • Material Declaration external-link
  • HTML
  • Reliablity Data external-link
LT8646SEV#TRPBF 32-Lead LQFN (6mm x 4mm x 0.94mm w/ EP) external-link
  • HTML
  • Material Declaration external-link
  • HTML
  • Reliablity Data external-link
LT8646SEV#WPBF 32-Lead LQFN (6mm x 4mm x 0.94mm w/ EP) external-link
  • HTML
  • Material Declaration external-link
  • HTML
  • Reliablity Data external-link
LT8646SEV#WTRPBF 32-Lead LQFN (6mm x 4mm x 0.94mm w/ EP) external-link
  • HTML
  • Material Declaration external-link
  • HTML
  • Reliablity Data external-link
LT8646SIV#PBF 32-Lead LQFN (6mm x 4mm x 0.94mm w/ EP) external-link
  • HTML
  • Material Declaration external-link
  • HTML
  • Reliablity Data external-link
LT8646SIV#TRPBF 32-Lead LQFN (6mm x 4mm x 0.94mm w/ EP) external-link
  • HTML
  • Material Declaration external-link
  • HTML
  • Reliablity Data external-link
LT8646SIV#WPBF 32-Lead LQFN (6mm x 4mm x 0.94mm w/ EP) external-link
  • HTML
  • Material Declaration external-link
  • HTML
  • Reliablity Data external-link
LT8646SIV#WTRPBF 32-Lead LQFN (6mm x 4mm x 0.94mm w/ EP) external-link
  • HTML
  • Material Declaration external-link
  • HTML
  • Reliablity Data external-link

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Feb 6, 2024

- 24_0002

Qualification of New Mold Compound, SMT Paste and Pillar Diameter Change for LT8645S, LT8645S-2, LT8646S

LT8646SEV#PBF

PRODUCTION

LT8646SEV#TRPBF

PRODUCTION

LT8646SEV#WPBF

LT8646SEV#WTRPBF

LT8646SIV#PBF

PRODUCTION

LT8646SIV#TRPBF

PRODUCTION

LT8646SIV#WPBF

LT8646SIV#WTRPBF

pdf

PCN24_0002_Form

external-icon

xls

Material_Report

Download

pdf

Qualification Results Summary

external-icon

xlsm

Delta Qualification Matrix

Download

Other

Apr 11, 2019

- 19_0067

Notification of Wafer Fab Location Change for 0.35 BCD Process

LT8646SEV#PBF

PRODUCTION

LT8646SIV#PBF

PRODUCTION

pdf

PCN19_0067_Form

external-icon

xls

Material_Report

Download

xlsm

Delta Qualification Matrix

Download

pdf

Qualification Results Summary

external-icon

Detailed Parts List

pdf

Other

external-icon

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Feb 6, 2024

- 24_0002

arrow down

Qualification of New Mold Compound, SMT Paste and Pillar Diameter Change for LT8645S, LT8645S-2, LT8646S

LT8646SEV#PBF

PRODUCTION

LT8646SEV#TRPBF

PRODUCTION

LT8646SEV#WPBF

LT8646SEV#WTRPBF

LT8646SIV#PBF

PRODUCTION

LT8646SIV#TRPBF

PRODUCTION

LT8646SIV#WPBF

LT8646SIV#WTRPBF

pdf

PCN24_0002_Form

external-icon

xls

Material_Report

Download

pdf

Qualification Results Summary

external-icon

xlsm

Delta Qualification Matrix

Download
Other
Apr 11, 2019

- 19_0067

arrow down

Notification of Wafer Fab Location Change for 0.35 BCD Process

LT8646SEV#PBF

PRODUCTION

LT8646SIV#PBF

PRODUCTION

pdf

PCN19_0067_Form

external-icon

xls

Material_Report

Download

xlsm

Delta Qualification Matrix

Download

pdf

Qualification Results Summary

external-icon
Detailed Parts List

pdf

Other

external-icon

Software & Part Ecosystem

Parts Product Life Cycle Description

High Voltage Hot Swap Controllers1
LTC4380
popup image
Cart

RECOMMENDED FOR NEW DESIGNS

Low Quiescent Current Surge Stopper

Low Voltage Hot Swap Controllers1
LTC4231
popup image
Cart

RECOMMENDED FOR NEW DESIGNS

Micropower Hot Swap Controller

Evaluation Kits 1

reference details image

DC2660A

LT8646S Demo Board | 65V, 8A Synchronous Step-Down Silent Switcher 2

zoom

DC2660A

LT8646S Demo Board | 65V, 8A Synchronous Step-Down Silent Switcher 2

download icon

Download

 print icon

Print
DC2660A
LT8646S Demo Board | 65V, 8A Synchronous Step-Down Silent Switcher 2
Buy Now View Details

Product Detail

Demonstration circuit 2660A is a 65V, 8A synchronous step-down second generation Silent Switcher® with spread spectrum frequency modulation featuring the LT8646S. The demo board is designed for 5V output from a 5.6V to 65V input. The wide input range allows a variety of input sources, such as automotive batteries and industrial supplies. The LT8646S is a compact, ultralow emission, high efficiency, and high speed synchronous monolithic step-down switching regulator. The integrated bypass capacitors optimize all the fast current loops and make it easier to minimize EMI/EMC emissions by reducing layout sensitivity. Selectable spread spectrum mode can further improve EMI/EMC performance. Fast minimum on-time of 40ns enables high VIN to low VOUT conversion at high frequency.

Resources

pdf icon

PDF

DC2660A - Demo Board Manual Download

563.00K

pdf icon

PDF

DC2660A - Schematics Download

30.00K

pdf icon

ZIP

DC2660A - Design Files Download

1.00M

Show More Arrow image

Evaluation Kits1

evaluation kit item images

DC2660A

LT8646S Demo Board | 65V, 8A Synchronous Step-Down Silent Switcher 2

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.

spice tool Lt Spice

LT8646S - Step-Down (Buck) Regulators Download

2 K

Recently Viewed

Part Details
Documentation
Software & Part Ecosystem
Evaluation Kit
Tools & Simulations
Latest Discussions