LTC3613 - 24V, 15A Monolithic Step Down Regulator with Differential Output Sensing

Features

  • Wide VIN Range: 4.5V to 24V; VOUT Range: 0.6V to 5.5V at up to 15A
  • 0.67% Output Voltage Accuracy
  • Controlled On-Time Valley Current Mode Architecture, Excellent Current Sharing Capability
  • Frequency Programmable from 200kHz to 1MHz and Synchronizable to External Clock
  • RSENSE or Inductor DCR Current Sensing With Accurate Current Limit
  • Fast Transient Response
  • Differential Output Voltage Sensing Allowing 500mV Common Mode Remote Ground
  • tON(MIN) = 65ns; tOFF(MIN) = 105ns
  • Overvoltage Protection and Current Limit Foldback
  • Power Good Output Voltage Monitor
  • Voltage Tracking Start-Up
  • External VCC Input for Bypassing Internal LDO
  • Micropower Shutdown: IQ = 15μA
  • 7mm × 9mm 56-pin QFN Package

Typical Application

LTC3613 Typical Application
LTC3613 Typical Application

Description

The LTC®3613 is a monolithic synchronous step-down switching regulator capable of regulating outputs from 0.6V to 5.5V with up to 15A output current. The controlled on-time constant frequency valley current mode architecture allows for both fast transient response and constant frequency switching in steady-state operation, independent of VIN, VOUT and load. This also provides excellent current sharing capability.

Differential output voltage sensing along with a precision internal reference combine to offer ±0.67% output regulation, even if the output ground reference deviates from local ground by 500mV. The switching frequency can be programmed from 200kHz to 1MHz with an external resistor. The switching frequency is also phase synchronizable to an external clock in applications where switching noise/ EMI reduction is crucial.

Very low tON and tOFF times allow for near 0% and near 100% duty cycles, respectively. Voltage tracking soft start-up is provided for tracking and sequencing applications. Safety features include output overvoltage protection, programmable current limit with foldback, and power good monitoring.

Packaging

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

7x9 QFN-56

LTC3613 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC3613EWKH#PBF QFN 56 E $13.93 $9.75 View
LTC3613EWKH#TRPBF QFN 56 E $9.81 View
LTC3613IWKH#PBF QFN 56 I $16.02 $11.21 View
LTC3613IWKH#TRPBF QFN 56 I $11.27 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
DC1700A LTC3613EWKH Demo Board | VIN = 4.5V to 24V, VOUT =1.5V@ 15A $150.00
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Click here to view our complete list of demo boards

Applications

  • Distributed Power System
  • Point-of-Load Converters
  • Servers

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Design Tools

LTpowerCAD

The LTpowerCAD II design tool is a complete power supply design tool program that can significantly ease the tasks of power supply design. It guides users to a solution, selects power stage components, provides detailed power efficiency, shows quick loop bode plot stability and load transient analysis, and can export a final design to LTspice for simulation. Click here to download LTpowerCAD

Design tools for the following parts are available in LTpowerCAD:
LTC3613

LTspiceIV

LTspice IV is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice IV

To launch a ready to run LTspice demonstration circuit for this part:

  • Step 1: If you have not installed LTspice on this computer, download and install LTspice IV
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
  • Step 3: If LTspice IV does not automatically open after clicking the link above, 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

To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.

Models for the following parts are available in LTspice IV:
LTC3613

Technical Support