LT3508

PRODUCTION

Dual Monolithic 1.4A Step-Down Switching Regulator

Data Sheet (Rev. E) Product Selection Table

Part Models: 16
1ku List Price: Starting From $4.01

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Part Details

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

Part Models: 16
1ku List Price: Starting From $4.01

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	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3508EFE#TRPBF	16-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3508EUF#PBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3508EUF#TRPBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3508HFE#PBF	16-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3508HFE#TRPBF	16-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3508HFE#WPBF	TSSOP W/ THERMAL PAD	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3508HFE#WTRPBF	TSSOP W/ THERMAL PAD	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3508HUF#PBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3508HUF#TRPBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3508IFE#PBF	16-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3508IFE#TRPBF	16-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3508IFE#WPBF	16-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3508IFE#WTRPBF	16-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3508IUF#PBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3508IUF#TRPBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Apr 17, 2025 - 25_0043 Change of Gold to Copper Wire and BOM (Automotive)
		PCN25_0043_Form Material_Report Delta Qualification Matrix Qualification Results Summary
LT3508EFE#PBF	PRODUCTION
LT3508EFE#TRPBF	PRODUCTION
LT3508EUF#PBF	PRODUCTION
LT3508EUF#TRPBF	PRODUCTION
LT3508HUF#PBF	PRODUCTION
LT3508HUF#TRPBF	PRODUCTION
Apr 6, 2022 - 22_0068 Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL
		PCN22_0068_Form Material_Report Delta Qualification Matrix
LT3508EFE#PBF	PRODUCTION
LT3508EFE#TRPBF	PRODUCTION
LT3508HFE#PBF	PRODUCTION
LT3508HFE#TRPBF	PRODUCTION
LT3508HFE#WPBF	PRODUCTION
LT3508HFE#WTRPBF	PRODUCTION
LT3508IFE#PBF	PRODUCTION
LT3508IFE#TRPBF	PRODUCTION
LT3508IFE#WPBF	PRODUCTION
LT3508IFE#WTRPBF	PRODUCTION
Feb 20, 2022 - 21_0269 Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products
		PCN21_0269_Form Material_Report Detailed Change Description Qualification Results Summary
LT3508EUF#PBF	PRODUCTION
LT3508EUF#TRPBF	PRODUCTION
LT3508HUF#PBF	PRODUCTION
LT3508HUF#TRPBF	PRODUCTION
LT3508IUF#PBF	PRODUCTION
LT3508IUF#TRPBF	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

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Digital Power System Managers 1
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Dual-Supply Monitors 1
LTC2960	RECOMMENDED FOR NEW DESIGNS	36V Nano-Current Two-Input Voltage Monitor
Silicon Oscillators 1
LTC6909	PRODUCTION	1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation
Surge Stopper, Overvoltage, and Overcurrent Protection 1
LTC4365	RECOMMENDED FOR NEW DESIGNS	Overvoltage, Undervoltage and Reverse Supply Protection Controller

Tools & Simulations

LTspice 1

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

Models for the following parts are available in LTspice:

LT3508

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.

Evaluation Kits

LT3508EFE/LT3508EUF Demo Board

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Product Details

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 V_IN 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 V_IN to V_OUT 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

DC1060A - Demo Manual
9/24/2009

DC1060A - Schematic
9/24/2009

DC1060A - Design File
9/24/2009

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LT3508

Part Details

Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Technical Articles 1

Solutions Bulletin & Brochure 1