LTC3124

RECOMMENDED FOR NEW DESIGNS

15V, 5A 2-Phase Synchronous Step-Up DC/DC Converter with Output Disconnect

Part Models: 10
1ku List Price: Starting From $3.91

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Overview

V_IN Range: 1.8V to 5.5V, 500mV After Start-Up
Adjustable Output Voltage: 2.5V to 15V
1.5A Output Current for V_IN = 5V and V_OUT = 12V
Dual-Phase Control Reduces Output Voltage Ripple
Output Disconnects from Input When Shut Down
Synchronous Rectification: Up to 95% Efficiency
Inrush Current Limit
Up to 3MHz Programmable Switching Frequency Synchronizable to External Clock
Selectable Burst Mode^® Operation: 25μA I_Q
Output Overvoltage Protection
Internal Soft-Start
<1μA I_Q in Shutdown
16-Lead, Thermally-Enhanced 3mm × 5mm × 0.75mm DFN and TSSOP Packages

The LTC3124 is a dual-phase, synchronous step-up DC/DC converter with true output disconnect and inrush current limiting capable of providing output voltages up to 15V. Dual-phase operation significantly reduces peak inductor and capacitor ripple currents, minimizing inductor and capacitor size. The 2.5A per phase current limit, along with the ability to program output voltages up to 15V make the LTC3124 well suited for a variety of demanding applications. Once started, operation will continue with inputs down to 500mV.

The LTC3124 switching frequency can be programmed from 100kHz to 3MHz to optimize applications for highest efficiency or smallest solution footprint. The oscillator can be synchronized to an external clock for noise sensitive applications. Selectable Burst Mode operation reduces quiescent current to 25μA, ensuring high efficiency across the entire load range. An internal soft-start limits inrush current during start-up.

Other features include a <1μA shutdown current and robust protection under short-circuit, thermal overload, and output overvoltage conditions. The LTC3124 is offered in both 16-lead DFN and thermally-enhanced TSSOP packages.

Applications

RF, Microwave Power Amplifiers
Piezo Actuators
Small DC Motors, Thermal Printers
12V Analog Rail from Battery, 5V, or Backup Capacitor

Part Models: 10
1ku List Price: Starting From $3.91

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
LTC3124EDHC#PBF	16-Lead DFN (5mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3124EDHC#TRPBF	16-Lead DFN (5mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3124EFE#PBF	16-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3124EFE#TRPBF	16-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3124HFE#PBF	16-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3124HFE#TRPBF	16-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3124IDHC#PBF	16-Lead DFN (5mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3124IDHC#TRPBF	16-Lead DFN (5mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3124IFE#PBF	16-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3124IFE#TRPBF	16-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Feb 14, 2025 - 25_0017 Bond Wire Change from Gold to Copper
		PCN25_0017_Form Material_Report Qualification Results Summary
LTC3124EDHC#PBF	PRODUCTION
LTC3124EDHC#TRPBF	PRODUCTION
LTC3124EFE#PBF	PRODUCTION
LTC3124EFE#TRPBF	PRODUCTION
LTC3124HFE#PBF	PRODUCTION
LTC3124HFE#TRPBF	PRODUCTION
LTC3124IDHC#PBF	PRODUCTION
LTC3124IDHC#TRPBF	PRODUCTION
LTC3124IFE#PBF	PRODUCTION
LTC3124IFE#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
LTC3124EFE#PBF	PRODUCTION
LTC3124EFE#TRPBF	PRODUCTION
LTC3124HFE#PBF	PRODUCTION
LTC3124HFE#TRPBF	PRODUCTION
LTC3124IFE#PBF	PRODUCTION
LTC3124IFE#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
Protection Switches & Controllers 1
LTC4417	RECOMMENDED FOR NEW DESIGNS	Prioritized PowerPath^™ Controller

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LTC3124

LTpowerCAD 1

LTC3124 Project - 15V, 5A 2-Phase Synchronous Boost Converter (1.8-5.5V to 12V @ 1.5A)

Design tools for the following parts are available in LTpowerCAD:

LTC3124

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.

LTpowerCAD^® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.

Evaluation Kits

LTC3124 Demo Board | 2-Phase Sync Boost, 1.8V ≤ VIN ≤ 5.5V, VOUT = 12V @ Up to 1.5A

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Product Details

Demonstration circuit DC1859 is a dual phase DC/DC boost converter featuring the LTC3124. The DC1859A operates over 1.8V to 5.5V input and it generates 12V at 1.5A output from a 5V input. The LTC3124 has a 2% precise voltage reference, which can generate an output voltage with 2.2% tolerance when 0.1% voltage divider resistors are used. The 1MHz switching frequency operation results in a small and efficient circuit. The converter operates with only one phase in burst mode and achieves over 90% efficiency with a 100mA load. The demonstration circuit can be easily modified to generate different output voltages.

Resources

DC1859A - Schematic
9/8/2014

DC1859A - Demo Manual
10/8/2014

DC1859A - Design Files
6/12/2014

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