LT3508
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LT3508

Dual Monolithic 1.4A Step-Down Switching Regulator

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LTspice LT3508 Demo Circuit - Dual Monolithic 1.4A Step-Down Switching Regulator (12V to 3.3V @ 1.4A & 5V @ 1.4A) Download 5.00KB LTspice LT3508 - Step-Down (Buck) Regulators Download 4.84 KB
Part Models 16
1ku List Price Starting From $4.01
Features
  • Wide Input Voltage Range: 3.7V to 36V
  • Two 1.4A Output Switching Regulators with Internal Power Switches
  • Adjustable 250kHz to 2.5MHz Switching Frequency
  • Synchronizable over the Full Frequency Range
  • Anti-Phase Switching Reduces Ripple
  • Uses Small Inductors and Ceramic Capacitors
  • Accurate Programmable Undervoltage Lockout
  • Independent Tracking, Soft-Start and Power Good Circuits Ease Supply Sequencing
  • Output Adjustable Down to 800mV
  • Small 4mm × 4mm 24-Pin QFN or 16-Pin Thermally Enhanced TSSOP Surface Mount Packages
  • AEC-Q100 Qualified for Automotive Applications
Additional Details
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The LT3508 is a dual current mode PWM step-down DC/DC converter with internal power switches capable of generating two 1.4A outputs. The wide input voltage range of 3.7V to 36V makes the LT3508 suitable for regulating power from a wide variety of sources, including automotive batteries, 24V industrial supplies and unregulated wall adapters. Both converters are synchronized to a single oscillator programmable up to 2.5MHz and run with opposite phases, reducing input ripple current. Its high operating frequency allows the use of small, low cost inductors and ceramic capacitors, resulting in low, predictable output ripple. Each regulator has independent tracking and soft-start circuits and generates a power good signal when its output is in regulation, easing power supply sequencing and interfacing with microcontrollers and DSPs.

Cycle-by-cycle current limit, frequency foldback and thermal shutdown provide protection against shorted outputs, and soft-start eliminates input current surge during startup. The low current (<2µA) shutdown mode enables easy power management in battery-powered systems.

Applications

  • Automotive
  • DSP Power Supplies
  • Wall Transformer Regulation
  • DSL and Cable Modems
  • PCI Express
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file View Data Sheet (Rev.E)
Documentation View All Documentation
LTspice LT3508 Demo Circuit - Dual Monolithic 1.4A Step-Down Switching Regulator (12V to 3.3V @ 1.4A & 5V @ 1.4A) Download 5.00KB LTspice LT3508 - Step-Down (Buck) Regulators Download 4.84 KB
Part Models 16
1ku List Price Starting From $4.01
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LT3508

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UPDATED 11/04/2020
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LT3508: Dual Monolithic 1.4A Step-Down Switching Regulator Data Sheet (Rev.E)

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UPDATED 05/28/2009
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LT3508: デュアル･モノリシック1.4A降圧スイッチング・レギュレータ データシート

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UPDATED 03/26/2018
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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
LT3508EFE#PBF 16-Lead TSSOP w/ EP external-link
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LT3508EFE#TRPBF 16-Lead TSSOP w/ EP external-link
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LT3508EUF#PBF 24-Lead QFN (4mm x 4mm x 0.75mm w/ EP) external-link
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  • Material Declaration external-link
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LT3508EUF#TRPBF 24-Lead QFN (4mm x 4mm x 0.75mm w/ EP) external-link
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  • Material Declaration external-link
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LT3508HFE#PBF 16-Lead TSSOP w/ EP external-link
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  • Material Declaration external-link
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LT3508HFE#TRPBF 16-Lead TSSOP w/ EP external-link
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LT3508HFE#WPBF TSSOP W/ THERMAL PAD
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LT3508HFE#WTRPBF TSSOP W/ THERMAL PAD
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LT3508HUF#PBF 24-Lead QFN (4mm x 4mm x 0.75mm w/ EP) external-link
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LT3508HUF#TRPBF 24-Lead QFN (4mm x 4mm x 0.75mm w/ EP) external-link
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  • Material Declaration external-link
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LT3508IFE#PBF 16-Lead TSSOP w/ EP external-link
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LT3508IFE#TRPBF 16-Lead TSSOP w/ EP external-link
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  • Material Declaration external-link
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LT3508IFE#WPBF 16-Lead TSSOP w/ EP external-link
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LT3508IFE#WTRPBF 16-Lead TSSOP w/ EP external-link
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LT3508IUF#PBF 24-Lead QFN (4mm x 4mm x 0.75mm w/ EP) external-link
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LT3508IUF#TRPBF 24-Lead QFN (4mm x 4mm x 0.75mm w/ EP) external-link
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Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL

LT3508EFE#PBF

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LT3508EFE#TRPBF

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Feb 20, 2022

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Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

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LT3508EUF#TRPBF

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LT3508HUF#PBF

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LT3508IUF#PBF

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LT3508IUF#TRPBF

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

LT3508EFE#PBF

PRODUCTION

LT3508EFE#TRPBF

PRODUCTION

LT3508HFE#PBF

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LT3508HFE#TRPBF

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LT3508HFE#WPBF

LT3508HFE#WTRPBF

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LT3508IFE#TRPBF

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PCN22_0068_Form

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Material_Report

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Delta Qualification Matrix

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Feb 20, 2022

- 21_0269

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Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

LT3508EUF#PBF

PRODUCTION

LT3508EUF#TRPBF

PRODUCTION

LT3508HUF#PBF

PRODUCTION

LT3508HUF#TRPBF

PRODUCTION

LT3508IUF#PBF

PRODUCTION

LT3508IUF#TRPBF

PRODUCTION

pdf

PCN21_0269_Form

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xls

Material_Report

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Detailed Change Description

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pdf

Qualification Results Summary

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Software & Part Ecosystem

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Evaluation Kit

Evaluation Kits 1

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DC1060A

LT3508EFE/LT3508EUF Demo Board

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DC1060A

LT3508EFE/LT3508EUF Demo Board

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DC1060A
LT3508EFE/LT3508EUF Demo Board
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Product Detail

Demonstration circuit 1060 features two LT3508 step-down DC/DC switching converters. One circuit uses the LT3508EFE and the other circuit has the LT3508EUF. The LT3508 dual output step-down switching regulator has two internal power switches, a wide input voltage range, adjustable switching frequency synchronizable over the frequency range, programmable soft-start, tracking, power-good, and channel sequencing. The anti-phase switching reduces the input capacitor. The wide VIN range of the LT3508 allows step-down configurations with up to 36V input. The high power internal switches have current limit that allows for up to 1.4A output on each output.


The demonstration circuit has two circuits. The top is optimized for high efficiency, wide input range and maximum output current; the bottom is optimized for the size. The top circuit is rated for 3.3V at 1.4A and 5V at 1.4A output from a 6V–36V input using the FE package. The frequency is set to 700kHz to allow for the high VIN to VOUT ratio and provides high efficiency throughout the range. The bottom circuit generates 1.8V at 1A and 3.3V at 1A from a 5V to 16V DC input using the QFN package and shows off the compact size with 1.6MHz switching frequency.

Resources

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DC1060A - Demo Manual Download

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DC1060A - Schematic Download

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DC1060A - Design File Download

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Evaluation Kits1

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DC1060A

LT3508EFE/LT3508EUF Demo Board
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

LT3508 Demo Circuit - Dual Monolithic 1.4A Step-Down Switching Regulator (12V to 3.3V @ 1.4A & 5V @ 1.4A) Download

5.00K

spice tool Lt Spice

LT3508 - Step-Down (Buck) Regulators Download

4.84 K

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