LT3686A
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LT3686A

37V/1.2A Step-Down Regulator in 3mm × 3mm DFN and MSE

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LTspice LT3686A - Step-Down (Buck) Regulators Download 1.91 KB LTspice LT3686A Demo Circuit - 37V Step-Down Regulator (12V to 3.3V@1.2A) Download 2.00KB
Part Models 10
1ku List Price Starting From $3.02
Features
  • Wide Input Range:
    • Operation from 3.6V to 37V
    • Overvoltage Lockout Protects Circuit Through 60V Transients
  • Low Minimum On-Time:
    • Converts 16VIN to 3.3VOUT at 2MHz
  • 1.2A Output Current
  • Adjustable Frequency: 300kHz to 2.5MHz
  • Constant Switching Frequency at Light Loads
  • Can Be Synchronized to External Clock
  • Tracking and Soft-Start
  • Precision UVLO
  • Short-Circuit Robust
  • IQ in Shutdown <1μA
  • Internally Compensated
  • Thermally Enhanced eMSOP and 3mm × 3mm DFN Packages
Additional Details
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The LT3686A is a current mode PWM step-down DC/DC converter with an internal power switch. The wide input range of 3.6V to 37V makes the LT3686A suitable for regulating power from a wide variety of sources, including 24V industrial supplies and automotive batteries. Its high maximum frequency allows the use of tiny inductors and capacitors, resulting in a very small solution. Operating frequency above the AM band avoids interfering with radio reception, making the LT3686A particularly suitable for automotive applications.

Cycle-by-cycle current limit, thermal shutdown and DA current sense provide protection against fault conditions. Soft-start and frequency foldback eliminate input current surge during start-up. An optional internal regulated active load at the output via the BD pin keeps the LT3686A at full switching frequency at light loads, resulting in low, predictable output ripple above the audio and AM bands. Internal compensation and an internal boost diode reduce external component count.

The LT3686A offers external synchronization capability, whereas the LT3686 does not.

  Overvoltage Protections Features
LT3686 55V -
LT3686A 60V External Synchronization

Applications

  • Automotive Systems
  • Battery-Powered Equipment
  • Wall Transformer Regulation
  • Distributed Supply Regulation
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file View Data Sheet
Documentation View All Documentation
LTspice LT3686A - Step-Down (Buck) Regulators Download 1.91 KB LTspice LT3686A Demo Circuit - 37V Step-Down Regulator (12V to 3.3V@1.2A) Download 2.00KB
Part Models 10
1ku List Price Starting From $3.02
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LT3686A

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UPDATED 05/31/2011
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LT3686A: 37V/1.2A Step-Down Regulator in 3mm × 3mm DFN and MSE Data Sheet

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UPDATED 09/06/2011
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LT3686A: 3mm×3mm DFNおよびMSEパッケージの37V/1.2A降圧レギュレータ データシート

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Documentation

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
LT3686AEDD#PBF 10-Lead DFN (3mm x 3mm w/ EP) external-link
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LT3686AEMSE#PBF 12-Lead MSOP w/ EP external-link
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LT3686AEMSE#TRPBF 12-Lead MSOP w/ EP external-link
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LT3686AHMSE#PBF 12-Lead MSOP w/ EP external-link
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LT3686AHMSE#TRPBF 12-Lead MSOP w/ EP external-link
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LT3686AIDD#PBF 10-Lead DFN (3mm x 3mm w/ EP) external-link
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LT3686AIDD#TRPBF 10-Lead DFN (3mm x 3mm w/ EP) external-link
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LT3686AIMSE#PBF 12-Lead MSOP w/ EP external-link
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Oct 11, 2022

- 22_0244

Epoxy Change from Henkel 8290 to 8290A for MSOP Package

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Feb 4, 2020

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Apr 18, 2022

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Oct 11, 2022

- 22_0244

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Epoxy Change from Henkel 8290 to 8290A for MSOP Package

LT3686AEMSE#PBF

PRODUCTION

LT3686AEMSE#TRPBF

PRODUCTION

LT3686AHMSE#PBF

PRODUCTION

LT3686AHMSE#TRPBF

PRODUCTION

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PCN22_0244_Form

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xls

Material_Report

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Qualification Results Summary

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Delta Qualification Matrix

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Feb 4, 2020

- 20_0129

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Laser Mark Conversion for 12-Lead MSOP Packages Assembled in ADPG and UTAC

LT3686AEMSE#PBF

PRODUCTION

LT3686AEMSE#TRPBF

PRODUCTION

LT3686AHMSE#PBF

PRODUCTION

LT3686AHMSE#TRPBF

PRODUCTION

LT3686AIMSE#PBF

PRODUCTION

LT3686AIMSE#TRPBF

PRODUCTION

pdf

PCN20_0129_Form

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xls

Material_Report

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Apr 18, 2022

- 22_0050

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UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages / Devices

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PRODUCTION

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PRODUCTION

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PCN22_0050_Form

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xls

Material_Report

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pdf

Qualification Results Summary

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Software & Part Ecosystem

Parts Product Life Cycle Description

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Evaluation Kits 1

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DC1647A

LT3686AEDD Demo Board | 5V ≤ VIN ≤ 37V (55V Transients), VOUT = 3.3V @ 1.2A, SYNC Pin

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DC1647A

LT3686AEDD Demo Board | 5V ≤ VIN ≤ 37V (55V Transients), VOUT = 3.3V @ 1.2A, SYNC Pin

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DC1647A
LT3686AEDD Demo Board | 5V ≤ VIN ≤ 37V (55V Transients), VOUT = 3.3V @ 1.2A, SYNC Pin
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Product Detail

Demo circuit 1647 is a current-mode PWM step-down DC/DC regulator with an internal power switch featuring the LT3686A. The LT3686A differs from the LT3686 in that it offers higher transient voltage protection and a SYNC pin. The demo circuit is designed for 3.3V/1.2A output from a 5V to 37V input with transients up to 55V. Its high 2.5MHz maximum frequency allows the use of tiny inductors and capacitors. Operating frequency above the AM band avoids interfering with radio reception, making the LT3686 particularly suitable for automotive applications. The LT3686A offers external synchronization capability, whereas the LT3686 does not.

Resources

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DC1647A - Schematic Download

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DC1647A- Demo Manual Download

561.00K

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DC1647A - Design Files Download

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Evaluation Kits1

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DC1647A

LT3686AEDD Demo Board | 5V ≤ VIN ≤ 37V (55V Transients), VOUT = 3.3V @ 1.2A, SYNC Pin

Tools & Simulations 1

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

LT3686A - Step-Down (Buck) Regulators Download

1.91 K

spice tool Lt Spice

LT3686A Demo Circuit - 37V Step-Down Regulator (12V to 3.3V@1.2A) Download

2.00K

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