LTC3600 - 15V, 1.5A Synchronous Rail-to-Rail Single Resistor Step-Down Regulator

Features

  • Single Resistor Programmable VOUT
  • ±1% ISET Accuracy
  • Tight VOUT Regulation Independent of VOUT Voltage
  • Easy to Parallel for Higher Current and Heat Spreading
  • Wide VOUT Range 0V to VIN – 0.5V
  • High Efficiency: Up to 96%
  • 1.5A Output Current
  • Adjustable Frequency: 200kHz to 4MHz
  • 4V to 15V VIN Range
  • Current Mode Operation for Excellent Line and Load Transient Response
  • Zero Supply Current in Shutdown
  • Available in Thermally Enhanced 12-Pin (3mm × 3mm) DFN and MSOP Packages

Typical Application

LTC3600 Typical Application
LTC3600 Typical Application

Description

The LTC3600 is a high efficiency, monolithic synchronous buck regulator whose output is programmed with just one external resistor. The accurate internally generated 50μA current source on the ISET pin allows the use of a single external resistor to program an output voltage that ranges from 0V to 0.5V below VIN. The VOUT voltage feeds directly back to the error amplifier in unity gain fashion and equals the ISET voltage. The operating supply voltage range is 4V to 15V, making it suitable for dual lithium-ion battery and 5V or 12V input point-of-load power supply applications.

The operating frequency is synchronizable to an external clock or programmable from 200kHz to 4MHz with an external resistor. High switching frequency allows the use of small surface mount inductors. The unique constant on-time architecture is ideal for operating at high frequency in high step-down ratio applications that also demand fast load transient response.

Packaging

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

3x3 DFN-12, MS-12

LTC3600 Package Drawing
LTC3600 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC3600EDD#PBF DFN 12 E $4.00 $2.80 View
LTC3600EDD#TRPBF DFN 12 E $2.86 View
LTC3600EMSE#PBF MSOP 12 E $4.00 $2.80 View
LTC3600EMSE#TRPBF MSOP 12 E $2.86 View
LTC3600IDD#PBF DFN 12 I $4.60 $3.22 View
LTC3600IDD#TRPBF DFN 12 I $3.28 View
LTC3600IMSE#PBF MSOP 12 I $4.60 $3.22 View
LTC3600IMSE#TRPBF MSOP 12 I $3.28 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
DC1667A LTC3600EDD Demo Board I 4.5V to 15V Input, Adjustable Output with 1.5A IOUT $100.00
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Click here to view our complete list of demo boards

Applications

  • Voltage Tracking Supplies
  • Point-of-Load Power Supplies
  • Portable Instruments
  • Distributed Power Systems

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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:
LTC3600

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:
LTC3600

Technical Support