LTC3649
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LTC3649

60V, 4A Synchronous Step-Down Regulator with Rail-to-Rail Programmable Output

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LTspice LTC3649 - Step-Down (Buck) Regulators Download 2.38 KB LTspice LTC3649 Demo Circuit - High Voltage Monolithic Synchronous Buck Regulator with Output Voltage Control (10-60V to 2.5-7.5V @ 4A) Download 4.00KB LTspice LTC3649 Demo Circuit - High Voltage Monolothic Synchronous Buck Regulator (4-60V to 5V @ 4A) Download 4.00KB LTspice LTC3649 Demo Circuit - Hold-Up Circuit Using a Buck Regulator with Vin Boost Capabilities (5.5-60V to 5V @ 4A, 8V Hold-Up) Download 4.00KB LTspice LTC3649 Demo Circuit - High Voltage Monolothic Synchronous Buck Regulator with Cable Drop Compensation (4-60V to 5V @ 4A) Download 4.00KB LTspice LTC3649 Demo Circuit - High Voltage Synchronous Buck Regulator with Output Voltage Control (10-60V to 5V @ 4A) Download 4.00KB
Part Models 8
1ku List Price Starting From $6.72
Features
  • Wide VIN Range: 3.1V to 60V
  • Wide VOUT Range: 0V to (VIN – 0.5V)
  • Single Resistor VOUT Programming
  • Integrated 110mΩ Top N-Channel/50mΩ Bottom N-Channel MOSFETs
  • 95% Efficiency with 12VIN and 5VOUT
  • Regulated IQ: 440μA, Shutdown IQ: 18μA
  • Accurate Current Monitoring (±4%) without Sense Resistor
  • Accurate Resistor Programmable Frequency (300kHz to 3MHz) with ±50% Frequency Sync Range
  • Accurate Programmable Output Current
  • Input Voltage Regulation for MPPT Applications
  • ±0.8% Output Voltage Accuracy
  • Peak Current Mode Operation
  • Programmable Wire Drop Compensation
  • Burst Mode® Operation, Forced Continuous Mode
  • Internal Compensation and Programmable Soft-Start
  • Overtemperature Protection
  • Available in Thermally Enhanced 28-Lead (4mm × 5mm) QFN and TSSOP Packages
Additional Details
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The LTC3649 is a high efficiency 60V, 4A synchronous monolithic step-down regulator. The regulator features a single resistor programmable output voltage, internal compensation and high efficiencies over a wide VOUT range.

The step-down regulator operates from an input voltage range of 3.1V to 60V and provides an adjustable rail-to-rail output range from (VIN – 0.5V) to ground while delivering up to 4A of output current. The switching frequency is also adjusted with an external resistor. A user-selectable mode input is provided to allow the user to trade off ripple noise for efficiency at light loads; Burst Mode operation provides the highest efficiency at light loads, while forced continuous mode provides low output ripple. The MODE/SYNC pin can also be used to allow the user to synchronize the switching frequency to an external clock.

The LTC3649 operates with a peak current mode architecture that allows for fast transient response with inherent cycle-to-cycle current limit protection. It also features programmable output current limit, current monitoring and input voltage regulation.

Applications

  • Industrial Applications
  • Automotive Applications
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file View Data Sheet
Documentation View All Documentation
LTspice LTC3649 - Step-Down (Buck) Regulators Download 2.38 KB LTspice LTC3649 Demo Circuit - High Voltage Monolithic Synchronous Buck Regulator with Output Voltage Control (10-60V to 2.5-7.5V @ 4A) Download 4.00KB LTspice LTC3649 Demo Circuit - High Voltage Monolothic Synchronous Buck Regulator (4-60V to 5V @ 4A) Download 4.00KB LTspice LTC3649 Demo Circuit - Hold-Up Circuit Using a Buck Regulator with Vin Boost Capabilities (5.5-60V to 5V @ 4A, 8V Hold-Up) Download 4.00KB LTspice LTC3649 Demo Circuit - High Voltage Monolothic Synchronous Buck Regulator with Cable Drop Compensation (4-60V to 5V @ 4A) Download 4.00KB LTspice LTC3649 Demo Circuit - High Voltage Synchronous Buck Regulator with Output Voltage Control (10-60V to 5V @ 4A) Download 4.00KB
Part Models 8
1ku List Price Starting From $6.72
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LTC3649

Documentation

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Data Sheet

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UPDATED 05/10/2017
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LTC3649: 60V, 4A Synchronous Step-Down Regulator with Rail-to-Rail Programmable Output Data Sheet

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UPDATED 09/20/2016
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LTC3649: 出力をレール・トゥ・レールでプログラム可能な60V、4A同期整流式降圧レギュレータ データシート

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Design Note

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UPDATED 04/05/2016
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DN550 - 60V, 4A Synchronous Monolithic Step-Down Regulator Has Rail-to Rail Operation redirect icon

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UPDATED 04/14/2016
Chinese
DN550 - 60V、4A 同步单片式降压型稳压器具有轨至轨操作能力 redirect icon

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UPDATED 09/01/2016
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DN550 - レール・トゥ・レール動作対応の60V、4A同期整流式 モノリシック降圧レギュレータ redirect icon

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UPDATED 08/22/2007
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DN1014 - 80µA Quiescent Current Synchronous Step-Down Controller Extends Battery Life in Automotive Applications redirect icon

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UPDATED 07/13/2007
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DN1014 - 自動車用アプリケーションでバッテリ寿命を延ばす消費電流が80μAの同期式降圧コントローラ redirect icon

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UPDATED 02/05/2019
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60 V Input Monolithic Converter Powers Critical Circuits Without Supercaps or Other Additional Components redirect icon

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UPDATED 02/05/2019
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60 V输入单芯片转换器可在没有超级电容或其他附加元件的情况下为关键电路供电 redirect icon

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UPDATED 02/05/2019
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スーパーキャパシタなどの部品追加なしで重要な回路に電力を供給する、60V入力モノリシック・コンバータ redirect icon

User Guide

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UPDATED 02/17/2016
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DC2113A - Demo Manual redirect icon

478.00K

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UPDATED 02/02/2018
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DC2112A - Demo Board Manual redirect icon

548.00K

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Reliability Data

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UPDATED 03/26/2018
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R526 Reliability Data redirect icon

365.77 K

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Technical Articles

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UPDATED 11/15/2016
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60V Input Monolithic Converter Powers Critical Circuits without Supercaps or Other Additional Components redirect icon

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UPDATED 04/05/2016
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60V, 4A Synchronous Monolithic Step-Down Regulator Has Rail-to Rail Operation redirect icon

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UPDATED 04/05/2016
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60V、4A 同步单片式降压型稳压器具有轨至轨操作能力 redirect icon

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Documentation

Technical Documents 9
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Data Sheet 1

LTC3649: 60V, 4A Synchronous Step-Down Regulator with Rail-to-Rail Programmable Output Data Sheet

Reliability Data 1

R526 Reliability Data

User Guide 2

DC2113A - Demo Manual
DC2112A - Demo Board Manual

Design Note 3

DN550 - 60V, 4A Synchronous Monolithic Step-Down Regulator Has Rail-to Rail Operation
DN1014 - 80µA Quiescent Current Synchronous Step-Down Controller Extends Battery Life in Automotive Applications
60 V Input Monolithic Converter Powers Critical Circuits Without Supercaps or Other Additional Components

Technical Articles 2

60V Input Monolithic Converter Powers Critical Circuits without Supercaps or Other Additional Components
60V, 4A Synchronous Monolithic Step-Down Regulator Has Rail-to Rail Operation

Video

2

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Video

2017-09-18

60V, 4A Monolithic Buck Regulator w/ Rail-to-Rail Programmable Output and Integrated Current Monitoring

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2017-09-18

Low Voltage Power Supplies

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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
LTC3649EFE#PBF 28-Lead TSSOP w/ EP external-link
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LTC3649EFE#TRPBF 28-Lead TSSOP w/ EP external-link
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LTC3649EUFD#PBF 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) external-link
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LTC3649EUFD#TRPBF 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) external-link
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LTC3649IFE#PBF 28-Lead TSSOP w/ EP external-link
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  • Material Declaration external-link
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LTC3649IFE#TRPBF 28-Lead TSSOP w/ EP external-link
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LTC3649IUFD#PBF 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) external-link
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  • Reliablity Data external-link
LTC3649IUFD#TRPBF 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) external-link
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Apr 6, 2022

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Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL

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May 17, 2019

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Notification of Wafer Fab Location Change for 0.35 BCD Process

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PCN19_0067_Form

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Qualification Results Summary

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Apr 6, 2022

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Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL

LTC3649EFE#PBF

PRODUCTION

LTC3649EFE#TRPBF

PRODUCTION

LTC3649IFE#PBF

PRODUCTION

LTC3649IFE#TRPBF

PRODUCTION

pdf

PCN22_0068_Form

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xls

Material_Report

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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

LTC3649EFE#PBF

PRODUCTION

LTC3649EFE#TRPBF

PRODUCTION

LTC3649EUFD#PBF

PRODUCTION

LTC3649EUFD#TRPBF

PRODUCTION

LTC3649IFE#PBF

PRODUCTION

LTC3649IFE#TRPBF

PRODUCTION

LTC3649IUFD#PBF

PRODUCTION

LTC3649IUFD#TRPBF

PRODUCTION

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PCN19_0067_Form

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xls

Material_Report

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Delta Qualification Matrix

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pdf

Qualification Results Summary

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Detailed Parts List

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Other

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Software & Part Ecosystem

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60V, 4A Synchronous Step-Down Regulator for Inverting Outputs

Evaluation Kits 2

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DC2112A

LTC3649EUFD Demo Board | 4V ≤ VIN ≤ 60V; VOUT = 3.3V or 5V @ 4A

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DC2112A

LTC3649EUFD Demo Board | 4V ≤ VIN ≤ 60V; VOUT = 3.3V or 5V @ 4A

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DC2112A
LTC3649EUFD Demo Board | 4V ≤ VIN ≤ 60V; VOUT = 3.3V or 5V @ 4A
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Product Detail

Demonstration circuit 2112A is a high input voltage, high efficiency synchronous monolithic buck converter featuring the LTC3649 in a 28-lead UFD package. The DC2112A has wide input voltage range from 3.1V up to 60V. The output voltage of the DC2112A can be set as to 3.3V or 5V. However, the “USER SELECT” option of DC2112A allows output voltage to be as high as input voltage minus 0.5V, with certain modifications. DC2112A is capable of delivering up to 4A of output current. DC2112A supports three operation modes: Fixed-Frequency modulation and Burst Mode, user can synchronize it with an external clock also. Fixed-Frequency mode of operation maximizes the output current, reduces output voltage ripple, and yields a low noise switching spectrum. Burst Mode employs a variable frequency switching algorithm that minimizes the no-load input quiescent current and improves efficiency at light loads.


 

Resources

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DC2112A - Schematic Download

37.12 K

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DC2112A - Design Files Download

3.88 M

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DC2112A - Demo Board Manual Download

548.00K

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DC2113A

LTC3649 Demo Board | Synchronous Buck, 3.1V ≤ VIN ≤ 60V, VOUT = 3.3V/5V @ 4A

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DC2113A

LTC3649 Demo Board | Synchronous Buck, 3.1V ≤ VIN ≤ 60V, VOUT = 3.3V/5V @ 4A

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DC2113A
LTC3649 Demo Board | Synchronous Buck, 3.1V ≤ VIN ≤ 60V, VOUT = 3.3V/5V @ 4A
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Product Detail

Demonstration circuit 2113A is a high input voltage, high efficiency synchronous monolithic buck converter featuring the LTC3649. The DC2113A has wide input voltage range from 3.1V up to 60V. The output voltage of the DC2113A can be set as to 3.3V or 5V. However, “USER SELECT” option of DC2113A allows output voltage to be as high as input voltage minus 0.5V, with certain modifications. DC2113A is capable of delivering up to 4A of output current. DC2113A supports three operation modes: Fixed-Frequency modulation, Burst Mode® operation and the user can synchronize it with external clock also. Fixed-Frequency mode of operation maximizes the output current, reduces output voltage ripple, and yields a low noise switching spectrum. Burst Mode operation employs a variable frequency switching algorithm that minimizes the no-load input quiescent current and improves efficiency at light loads.

Resources

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DC2113A - Schematic Download

37.00K

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ZIP

DC2113A - Design Files Download

4.00M

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PDF

DC2113A - Demo Manual Download

478.00K

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Evaluation Kits2

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DC2112A

LTC3649EUFD Demo Board | 4V ≤ VIN ≤ 60V; VOUT = 3.3V or 5V @ 4A
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DC2113A

LTC3649 Demo Board | Synchronous Buck, 3.1V ≤ VIN ≤ 60V, VOUT = 3.3V/5V @ 4A

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

LTC3649 - Step-Down (Buck) Regulators Download

2.38 K

spice tool Lt Spice

LTC3649 Demo Circuit - High Voltage Monolithic Synchronous Buck Regulator with Output Voltage Control (10-60V to 2.5-7.5V @ 4A) Download

4.00K

spice tool Lt Spice

LTC3649 Demo Circuit - High Voltage Monolothic Synchronous Buck Regulator (4-60V to 5V @ 4A) Download

4.00K

spice tool Lt Spice

LTC3649 Demo Circuit - Hold-Up Circuit Using a Buck Regulator with Vin Boost Capabilities (5.5-60V to 5V @ 4A, 8V Hold-Up) Download

4.00K

spice tool Lt Spice

LTC3649 Demo Circuit - High Voltage Monolothic Synchronous Buck Regulator with Cable Drop Compensation (4-60V to 5V @ 4A) Download

4.00K

spice tool Lt Spice

LTC3649 Demo Circuit - High Voltage Synchronous Buck Regulator with Output Voltage Control (10-60V to 5V @ 4A) Download

4.00K

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