LT3514

PRODUCTION

Triple Step-Down Switching Regulator with 100% Duty Cycle Operation

Part Models: 9
1ku List Price: Starting From $4.19

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Overview

Wide Input Voltage Range: 3.2V to 36V
(40V Transient)
Three Outputs: 2A, 1A, 1A
100% Duty Cycle Operation
Resistor-Programmed Constant Frequency
Short-Circuit Robust
Wide SYNC Range: 350kHz to 2.2MHz
Anti-Phase Switching Reduces Ripple
Feedback Voltage: 800mV
Independent Run/Soft-Start Pins
Shutdown with UVLO
Internal Compensation
Thermal Shutdown
Tiny 28-Lead (4mm × 5mm) Thermally Enhanced QFN Package
24-Lead Exposed Pad TSSOP

The LT3514 consists of three buck regulators (2A, 1A, 1A output current). The device has a wide operating input range of 3.2V to 36V. An on-chip boost regulator allows each channel to operate up to 100% duty cycle. The LT3514 is designed to minimize external component count and results in a simple and small application circuit.

The LT3514 operates robustly in fault conditions. Cycleby- cycle peak current limit and catch diode current limit sensing protect the IC during overload conditions. Thermal shutdown protects the power switches at elevated temperatures. Soft-start helps control the peak inductor current during startup.

The LT3514 also features output voltage tracking and sequencing, programmable frequency, programmable undervoltage lockout, and a power good pin to indicate when all outputs are in regulation.

The LT3514 has one fewer channel (CH2) than the LT3504, and has one channel (CH3) that outputs 2A instead of 1A. The LT3514 in QFN is pin compatible with the LT3504. The LT3504 provides four 1A outputs.

Applications

Automotive Battery Regulation
Industrial Control Supplies
Wall Transformer Regulation
Distributed Supply Regulation

Part Models: 9
1ku List Price: Starting From $4.19

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
LT3514EFE#PBF	24-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3514EFE#TRPBF	24-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3514EUFD#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3514EUFD#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3514HFE#PBF	24-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3514IFE#PBF	24-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3514IFE#TRPBF	24-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3514IUFD#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3514IUFD#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Feb 14, 2025 - 25_0016 Bond Wire Change from Gold to Copper Wire (Notification Only)
		PCN25_0016_Form Material_Report Qualification Results Summary
LT3514EFE#PBF	PRODUCTION
LT3514EFE#TRPBF	PRODUCTION
LT3514EUFD#PBF	PRODUCTION
LT3514EUFD#TRPBF	PRODUCTION
LT3514HFE#PBF	PRODUCTION
LT3514IFE#PBF	PRODUCTION
LT3514IFE#TRPBF	PRODUCTION
LT3514IUFD#PBF	PRODUCTION
LT3514IUFD#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
LT3514EFE#PBF	PRODUCTION
LT3514EFE#TRPBF	PRODUCTION
LT3514HFE#PBF	PRODUCTION
LT3514IFE#PBF	PRODUCTION
LT3514IFE#TRPBF	PRODUCTION

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

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Power System Management (PSM) & Sequencers 1
LTC2977	RECOMMENDED FOR NEW DESIGNS	8-Channel PMBus Power System Manager Featuring Accurate Output Voltage Measurement
Protection Switches & Controllers 1
LT4363	RECOMMENDED FOR NEW DESIGNS	High Voltage Surge Stopper with Current Limit

Tools & Simulations

LTspice 1

LT3514 Demo Circuit - 36V Triple Buck Regulator (5.4-36V to 5V @ 1A, 3.3V @ 2A & 1.8V @ 1A)

Models for the following parts are available in LTspice:

LT3514

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

LT3514 Demo Board | 5.4V to 36VIN, Triple Output; VOUT1 = 5V @ 1A, VOUT2 = 3.3V @ 2A, VOUT3 = 1.8V @ 1A

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Product Details

Demonstration circuit 1980A is a triple current mode PWM step-down DC/DC converter featuring the LT3514. The demo circuit is designed for 5V, 3.3V and 1.8V outputs from a 5.4V to 36V input. The current capability of 5V and 1.8V outputs is 1A and the 3.3V output is capable of 2A output. Individual soft-start and current limit for each output as well as frequency synchronous function simplify the complex design of triple-output power converters.