LT8640S
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LT8640S

42V, 6A Synchronous Step-Down Silent Switcher 2 with 2.5μA Quiescent Current

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LTspice LT8640S - Step-Down (Buck) Regulators Download 2.23 KB
Part Models 10
1ku List Price Starting From $5.48
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 96% Efficiency at 1MHz, 12VIN to 5VOUT
    • Up to 95% Efficiency at 2MHz, 12VIN to 5VOUT
  • Wide Input Voltage Range: 3.4V to 42V
  • Output Voltage Range: 0.97V to 10V(LT8640S/LT8643S); 0.97V to (VIN – 0.5V) (LT8640SA/LT8643SA)
  • 6A Maximum Continuous, 7A Peak Output
  • Ultralow Quiescent Current Burst Mode® Operation
    • 2.5µA IQ Regulating 12VIN to 3.3VOUT (LT8640S/LT8640SA)
    • Output Ripple < 10mVP-P
  • External Compensation: Fast Transient Response and Current Sharing (LT8643S)
  • Robust High VOUT Operation (LT8640SA/LT8643SA)
    • Safely Tolerates High Reverse Current
  • Fast Minimum Switch On-Time: 30ns
  • Low Dropout Under All Conditions: 100mV at 1A
  • Forced Continuous Mode
  • Adjustable and Synchronizable: 200kHz to 3MHz
  • Output Soft-Start and Tracking
  • Small 24-Lead 4mm × 4mm LQFN Package
  • AEC-Q100 Qualified for Automotive Applications
Additional Details
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The LT®8640S/LT8643S/LT8640SA/LT8643SA 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 reducing layout sensitivity. This performance makes the LT8640S/LT8643S/LT8640SA/LT8643SA ideal for noise-sensitive applications and environments.

Peak current mode control with a 30ns minimum on-time allows high step-down ratios even at high switching frequencies. The LT8643S/LT8643SA has external compensation to enable current sharing and fast transient response at high switching frequencies.

Burst Mode operation enables ultralow standby current consumption, forced continuous mode can control frequency harmonics across the entire output load range, or spread
spectrum operation can further reduce EMI emissions.

Applications

  • Automotive and Industrial Supplies
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LTspice LT8640S - Step-Down (Buck) Regulators Download 2.23 KB
Part Models 10
1ku List Price Starting From $5.48
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LT8640S

Documentation

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Data Sheet

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UPDATED 09/19/2024
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LT8640S/LT8643S: 42V, 6A Synchronous Step-Down Silent Switcher 2 with 2.5μA Quiescent Current Data Sheet (Rev.D)

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UPDATED 07/02/2017
Japanese

LT8640S/LT8643S: 静止電流が 2.5 μA の 42 V、6 A 同期整流式降圧 Silent Switcher 2 データシート

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Design Note

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UPDATED 05/23/2018
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DN1049: 42V, 6A (7A Peak) High Efficient Step-Down Regulators with Ultralow EMI Emissions redirect icon

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UPDATED 07/01/2018
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42V, 6A (7A Peak) High Efficiency Step-Down Regulators with Ultralow EMI Emissions redirect icon

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UPDATED 07/01/2018
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42 V、6 A（峰值7 A）、超低EMI辐射、高效率降压型稳压器 redirect icon

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UPDATED 07/01/2018
Japanese
放射性EMIを極小に抑えた高効率の降圧　レギュレータ、42V入力で6Aの連続出力電流と7Aのピーク出力電流に対応 redirect icon

Evaluation Design File

1

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UPDATED 05/17/2017
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DC2530A - Design Files redirect icon

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User Guide

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UPDATED 05/16/2017
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DC2530A - Demo Manual redirect icon

562.00K

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Reliability Data

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UPDATED 03/23/2018
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R570 Reliability Data redirect icon

415.69 K

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Technical Articles

11

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UPDATED 06/24/2016
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95% Efficient at 2MHz 42V Synchronous Buck redirect icon

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UPDATED 06/24/2016
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可在 2MHz 提供 95% 效率的 42V 同步降压 redirect icon

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UPDATED 05/30/2017
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Low EMI Power Solutions and Electromagnetic Compatibility (EMC) Standards redirect icon

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UPDATED 11/01/2019
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Ride Through the MLCC Shortage by Reducing Capacitance Requirements in Your Power Supplies redirect icon

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UPDATED 11/01/2019
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通过降低电源对电容的要求来解决MLCC短缺问题 redirect icon

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UPDATED 11/01/2019
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電源に必要なコンデンサの容量値を削減し、MLCCの供給不足を乗り切る redirect icon

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UPDATED 07/01/2022
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The Golden Rule of Board Layout for Switched-Mode Power Supplies redirect icon

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UPDATED 07/01/2022
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开关模式电源电路板布局的黄金法则 redirect icon

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UPDATED 07/01/2022
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スイッチモード電源用ボード・レイアウトの黄金律 redirect icon

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UPDATED 04/09/2023
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さらなるノイズ低減を実現したSilent Switcher® 3 redirect icon

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UPDATED 08/05/2019
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MLCC クライシスを生き抜くために redirect icon

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Documentation

Technical Documents 10
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Data Sheet 1

LT8640S/LT8643S: 42V, 6A Synchronous Step-Down Silent Switcher 2 with 2.5μA Quiescent Current Data Sheet (Rev.D)

Reliability Data 1

R570 Reliability Data

User Guide 1

DC2530A - Demo Manual

Design Note 2

DN1049: 42V, 6A (7A Peak) High Efficient Step-Down Regulators with Ultralow EMI Emissions
42V, 6A (7A Peak) High Efficiency Step-Down Regulators with Ultralow EMI Emissions

Technical Articles 4

95% Efficient at 2MHz 42V Synchronous Buck
Low EMI Power Solutions and Electromagnetic Compatibility (EMC) Standards
Ride Through the MLCC Shortage by Reducing Capacitance Requirements in Your Power Supplies
The Golden Rule of Board Layout for Switched-Mode Power Supplies

Evaluation Design File 1

DC2530A - Design Files

Book & eBook 2

Power You Can Trust: Achieving Efficient Battery-Powered Solutions
Understanding Silent Switcher Technology: High Efficiency, Low EMI eBook

Solutions Bulletin & Brochure 1

Silent Switcher Technology

Rarely Asked Question Page 1

How to Measure and Determine Soft Start Timing When There Is No Soft Start Equation?

Webcast 2

Silent Switcher Regulators: High Efficiency with Ultralow EMI
Improving Switch-Mode Power Supplies Using Noise Cancelling Technology

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
LT8640SAAV#PBF 24-Lead LQFN (4mm x 4mm x 0.94mm w/ EP) external-link
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LT8640SAAV#TRPBF 24-Lead LQFN (4mm x 4mm x 0.94mm w/ EP) external-link
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LT8640SEV#PBF 24-Lead LQFN (4mm x 4mm x 0.94mm w/ EP) external-link
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LT8640SEV#TRPBF 24-Lead LQFN (4mm x 4mm x 0.94mm w/ EP) external-link
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LT8640SEV#WPBF 24-Lead LQFN (4mm x 4mm x 0.94mm w/ EP) external-link
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LT8640SEV#WTRPBF 24-Lead LQFN (4mm x 4mm x 0.94mm w/ EP) external-link
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LT8640SIV#PBF 24-Lead LQFN (4mm x 4mm x 0.94mm w/ EP) external-link
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  • Reliablity Data external-link
LT8640SIV#TRPBF 24-Lead LQFN (4mm x 4mm x 0.94mm w/ EP) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LT8640SIV#WPBF 24-Lead LQFN (4mm x 4mm x 0.94mm w/ EP) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LT8640SIV#WTRPBF 24-Lead LQFN (4mm x 4mm x 0.94mm w/ EP) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link

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Sep 15, 2023

- 23_0182

Notification of Qualification of Pillar Size Update for LT3977, LT3978, LT8636, LT8637, LT8640S, LT8640S-2, LT8643S, LT8643S-2

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Material_Report

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Qualification Results Summary

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Delta Qualification Matrix

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May 17, 2019

- 19_0067

Notification of Wafer Fab Location Change for 0.35 BCD Process

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LT8640SIV#PBF

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PCN19_0067_Form

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Sep 15, 2023

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Notification of Qualification of Pillar Size Update for LT3977, LT3978, LT8636, LT8637, LT8640S, LT8640S-2, LT8643S, LT8643S-2

LT8640SEV#PBF

PRODUCTION

LT8640SEV#TRPBF

PRODUCTION

LT8640SEV#WPBF

LT8640SEV#WTRPBF

LT8640SIV#PBF

PRODUCTION

LT8640SIV#TRPBF

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LT8640SIV#WTRPBF

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PCN23_0182_Form

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Material_Report

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Qualification Results Summary

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xlsm

Delta Qualification Matrix

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May 17, 2019

- 19_0067

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Notification of Wafer Fab Location Change for 0.35 BCD Process

LT8640SEV#PBF

PRODUCTION

LT8640SIV#PBF

PRODUCTION

pdf

PCN19_0067_Form

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xls

Material_Report

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Delta Qualification Matrix

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Qualification Results Summary

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

Evaluation Kits 1

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DC2530A

LT8640S Demo Board | Synchronous Buck Silent Switcher 2, 5.8V ≤ VIN ≤ 42V, VOUT = 5V @ 6A, fSW = 2MHz

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DC2530A

LT8640S Demo Board | Synchronous Buck Silent Switcher 2, 5.8V ≤ VIN ≤ 42V, VOUT = 5V @ 6A, fSW = 2MHz

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DC2530A
LT8640S Demo Board | Synchronous Buck Silent Switcher 2, 5.8V ≤ VIN ≤ 42V, VOUT = 5V @ 6A, fSW = 2MHz
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Product Detail

Demonstration circuit 2530A is a 42V, 6A micropower synchronous step-down second generation Silent Switcher® with spread spectrum frequency modulation featuring the LT8640S. The demo board is designed for 5V output from a 5.8V to 42V input. The wide input range allows a variety of input sources, such as automotive batteries and industrial supplies. The LT8640S 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. Ultralow quiescent current in Burst Mode® operation achieves high efficiency at very light loads. Fast minimum on-time of 30ns enables high VIN to low VOUT conversion at high frequency.

Resources

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DC2530A - Schematic Download

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DC2530A - Design Files Download

1.00M

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DC2530A - Demo Manual Download

562.00K

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Evaluation Kits1

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DC2530A

LT8640S Demo Board | Synchronous Buck Silent Switcher 2, 5.8V ≤ VIN ≤ 42V, VOUT = 5V @ 6A, fSW = 2MHz

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.

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LT8640S - Step-Down (Buck) Regulators Download

2.23 K

Reference Designs 1

NOVPED iMX6 QP Dev Kit

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NXP NOVPED iMX6 QP

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Part Used 6

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ADP222 reference design link

LTC3426 reference design link

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LTC3375 reference design link

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Reference Designs1

NOVPED iMX6 QP Dev Kit

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NXP iMX6 Platform EVK Hardware Verified Design for IO and Robust Power Supply

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