LT3509
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LT3509

Dual 36V, 700mA Step-Down Regulator

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LTspice LT3509 Demo Circuit - Dual 36V, 700mA Step-Down Regulator (12V to 5V @ 700mA) Download 2.00KB LTspice LT3509 - Step-Down (Buck) Regulators Download 1.86 KB
Part Models 10
1ku List Price Starting From $3.54
Features
  • Two 700mA Switching Regulators with Internal Power Switches
  • Wide 3.6V to 36V Operating Range
  • Overvoltage Lockout Protects Circuit Through 60V Supply Transients
  • Short-Circuit Robust
  • Low Dropout Voltage: 95% Maximum Duty Cycle
  • Adjustable 300kHz to 2.2MHz Switching Frequency Synchronizable Over the Full Range
  • Uses Small Inductors and Ceramic Capacitors
  • Integrated Boost Diodes
  • Internal Compensation
  • Thermally Enhanced 14-Lead (4mm × 3mm) DFN and 16 Lead MSOP Packages
Additional Details
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The LT3509 is a dual, current mode, step-down switching regulator, with internal power switches each capable of providing 700mA output current. This regulator provides a compact and robust solution for multi-rail systems in harsh environments. It incorporates several protection features including overvoltage lockout and cycle-by-cycle current limit. Thermal shutdown provides additional protection. The loop compensation components and the boost diodes are integrated on-chip. Switching frequency is set by a single external resistor. External synchronization is also possible. The high maximum switching frequency allows the use of small inductors and ceramic capacitors for low ripple. Constant frequency operation above the AM band avoids interference with radio reception, making the LT3509 well suited for automotive applications. Each regulator has an independent shutdown and soft-start control pin. When both converters are powered down, the common circuitry enters a low current shutdown state.

Applications

  • Automotive Electronics
  • Industrial Controls
  • Wall Transformer Regulation
  • Networking Devices
  • CPU, DSP, or FPGA Power
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file View Data Sheet
Documentation View All Documentation
LTspice LT3509 Demo Circuit - Dual 36V, 700mA Step-Down Regulator (12V to 5V @ 700mA) Download 2.00KB LTspice LT3509 - Step-Down (Buck) Regulators Download 1.86 KB
Part Models 10
1ku List Price Starting From $3.54
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LT3509

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UPDATED 01/18/2016
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LT3509: Dual 36V, 700mA Step-Down Regulator Data Sheet

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UPDATED 05/24/2010
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LT3509: デュアル36V、700mA降圧レギュレータ データシート

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Documentation

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
LT3509EDE#PBF 14-Lead DFN (4mm x 3mm w/ EP) external-link
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LT3509EDE#TRPBF 14-Lead DFN (4mm x 3mm w/ EP) external-link
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LT3509EMSE#PBF 16-Lead MSOP w/ EP external-link
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LT3509EMSE#TRPBF 16-Lead MSOP w/ EP external-link
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LT3509HMSE#PBF 16-Lead MSOP w/ EP external-link
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LT3509HMSE#TRPBF 16-Lead MSOP w/ EP external-link
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LT3509IDE#PBF 14-Lead DFN (4mm x 3mm w/ EP) external-link
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LT3509IDE#TRPBF 14-Lead DFN (4mm x 3mm w/ EP) external-link
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LT3509IMSE#PBF 16-Lead MSOP w/ EP external-link
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Feb 20, 2022

- 21_0269

Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

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Oct 11, 2022

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Epoxy Change from Henkel 8290 to 8290A for MSOP Package

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Laser Top Mark for 16-Lead MSOP Packages Assembled in ADPG and UTAC

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Apr 18, 2022

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

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Feb 20, 2022

- 21_0269

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Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

LT3509EDE#PBF

PRODUCTION

LT3509EDE#TRPBF

PRODUCTION

pdf

PCN21_0269_Form

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xls

Material_Report

Download

pdf

Detailed Change Description

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pdf

Qualification Results Summary

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Oct 11, 2022

- 22_0244

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Epoxy Change from Henkel 8290 to 8290A for MSOP Package

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LT3509EMSE#TRPBF

PRODUCTION

LT3509HMSE#PBF

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LT3509HMSE#TRPBF

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LT3509IMSE#PBF

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PCN22_0244_Form

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Material_Report

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Qualification Results Summary

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Delta Qualification Matrix

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Feb 4, 2020

- 20_0132

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Laser Top Mark for 16-Lead MSOP Packages Assembled in ADPG and UTAC

LT3509EMSE#PBF

PRODUCTION

LT3509EMSE#TRPBF

PRODUCTION

LT3509HMSE#PBF

PRODUCTION

LT3509HMSE#TRPBF

PRODUCTION

LT3509IMSE#PBF

PRODUCTION

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pdf

PCN20_0132_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

LT3509HMSE#PBF

PRODUCTION

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PRODUCTION

LT3509IMSE#PBF

PRODUCTION

LT3509IMSE#TRPBF

PRODUCTION

pdf

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Material_Report

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Qualification Results Summary

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Delta Qualification Matrix

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Evaluation Kit

Evaluation Kits 1

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DC1248A

LT3509EDE Demo Board | 6.5V ≤ VIN ≤ 36V (60V Transients), VOUT1 = 5V @ 0.7A, VOUT2 = 3.3V @ 0.7A

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DC1248A

LT3509EDE Demo Board | 6.5V ≤ VIN ≤ 36V (60V Transients), VOUT1 = 5V @ 0.7A, VOUT2 = 3.3V @ 0.7A

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DC1248A
LT3509EDE Demo Board | 6.5V ≤ VIN ≤ 36V (60V Transients), VOUT1 = 5V @ 0.7A, VOUT2 = 3.3V @ 0.7A
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Product Detail

Demonstration circuit 1248 is a dual monolithic buck regulator featuring the LT3509. The demo circuit is designed for 5V@700mA and 3.3V@700mA output from a 6.5V to 36V input. The input voltage can go up to 60V without damaging the part. The switching frequency can be set from 300kHz to 2.2MHz by a single external resistor, and it is synchronizable over the full range. The power switches, the compensation components and the boost diodes are all integrated into the silicon. The shutdown and soft start function is independent for each channel. The current mode control scheme creates fast transient response and good loop stability. The part has overvoltage lockout, cycle by cycle current limit and thermal shutdown. DA pin can further protect the silicon under fault conditions by sensing the diode current.


 


Resources

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DC1248A - Design File Download

676.00K

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DC1248A - Schematic Download

27.00K

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DC1248A - Demo Manual Download

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Evaluation Kits1

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DC1248A

LT3509EDE Demo Board | 6.5V ≤ VIN ≤ 36V (60V Transients), VOUT1 = 5V @ 0.7A, VOUT2 = 3.3V @ 0.7A
Tools & Simulations

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

LT3509 Demo Circuit - Dual 36V, 700mA Step-Down Regulator (12V to 5V @ 700mA) Download

2.00K

spice tool Lt Spice

LT3509 - Step-Down (Buck) Regulators Download

1.86 K
Reference Designs

Reference Designs 2

DC934A Demo Board for DK-DEV-5CSXC6N

altera-cyclone-v-soc-development-kit-and-soc-embedded-design-suite

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Circuits from the lab

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Features and Benefits

  • Analog Devices has worked closely with FPGA and processor manufacturers to develop verified power solutions that optimize cost, size and efficiency in high performance applications
  • Our reference designs are supported by an intuitive design tool set and IP
  • Our team can provide designs for quick prototypes that can speed time to market in the most complex applications
View Detailed Reference Design external link

Part Used 5

LT3022 reference design link

LTC3855 reference design link

LT3509 reference design link

LTC3613 reference design link

LTC3605 reference design link

Arria V SoC Development Kit

altera-arria-v-soc-development-kit-and-soc-embedded-design-suite

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altera-arria-v-soc-development-kit-and-soc-embedded-design-suite

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altera-arria-v-soc-development-kit-and-soc-embedded-design-suite

Circuits from the lab

tooltip Info:Circuits from the lab

Features and Benefits

  • Analog Devices has worked closely with FPGA and processor manufacturers to develop verified power solutions that optimize cost, size and efficiency in high performance applications
  • Our reference designs are supported by an intuitive design tool set and IP
  • Our team can provide designs for quick prototypes that can speed time to market in the most complex applications
View Detailed Reference Design external link

Part Used 6

LTM8025 reference design link

LTC3866 reference design link

LTC3855 reference design link

LTC3605 reference design link

LT3509 reference design link

LTC3026 reference design link

Reference Designs2

DC934A Demo Board for DK-DEV-5CSXC6N

altera-cyclone-v-soc-development-kit-and-soc-embedded-design-suite

Arria V SoC Development Kit

altera-arria-v-soc-development-kit-and-soc-embedded-design-suite

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