LTC3124 - 15V, 5A 2-Phase Synchronous Step-Up DC/DC Converter with Output Disconnect

Features

  • VIN Range: 1.8V to 5.5V, 500mV After Start-Up
  • Adjustable Output Voltage: 2.5V to 15V
  • 1.5A Output Current for VIN = 5V and VOUT = 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 IQ
  • Output Overvoltage Protection
  • Internal Soft-Start
  • <1μA IQ in Shutdown
  • 16-Lead, Thermally- Enhanced 3mm × 5mm × 0.75mm DFN and TSSOP Packages

Typical Application

LTC3124 Typical Application
LTC3124 Typical Application

Description

The LTC®3124 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.

Packaging

For complete and up to date package information and drawings, please refer to our packaging page

DFN-16, TSSOP-16

LTC3124 Package Drawing
LTC3124 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC3124EDHC#PBF DFN 16 E $4.66 $3.26 View
LTC3124EDHC#TRPBF DFN 16 E $3.32 View
LTC3124EFE#PBF TSSOP 16 E $4.66 $3.26 View
LTC3124EFE#TRPBF TSSOP 16 E $3.32 View
LTC3124HFE#PBF TSSOP 16 H $5.71 $4.00 View
LTC3124HFE#TRPBF TSSOP 16 H $4.06 View
LTC3124IDHC#PBF DFN 16 I $5.36 $3.75 View
LTC3124IDHC#TRPBF DFN 16 I $3.81 View
LTC3124IFE#PBF TSSOP 16 I $5.36 $3.75 View
LTC3124IFE#TRPBF TSSOP 16 I $3.81 View
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC1859A LTC3124 Demo Board | 2-Phase Sync Boost, 1.8V ≤ VIN ≤ 5.5V, VOUT = 12V @ Up to 1.5A. Contact Factory
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Applications

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

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Design Tools

Linear Technology provides a variety of custom design simulation tools and device models to allow even novice designers to quickly and easily evaluate circuits using high performance switching regulators, amplifiers, data converters, filters and more. Please visit our Design Tools page to view and download:

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