LTC3601 - 1.5A, 15V Monolithic Synchronous Step-Down Regulator

Features

  • 4V to 15V Operating Input Voltage Range
  • 1.5A Output Current
  • Up to 96% Efficiency
  • Very Low Duty Cycle Operation: 5% at 2.25MHz
  • Adjustable Switching Frequency: 800kHz to 4MHz
  • External Frequency Synchronization
  • Current Mode Operation for Excellent Line and Load Transient Response
  • User Selectable Burst Mode® (No Load IQ = 300μA) or Forced Continuous Operation
  • 0.6V Reference Allows Low Output Voltages
  • Short-Circuit Protected
  • Output Voltage Tracking Capability
  • Programmable Soft-Start
  • Power Good Status Output
  • Available in Small, Thermally Enhanced, 16-Pin QFN (3mm × 3mm) and MSOP Packages
Designed for Automotive and Transportation Applications
AEC-Q100 data available for specific packages


Typical Application

LTC3601 Typical Application
LTC3601 Typical Application

Description

The LTC3601 is a high efficiency, monolithic synchronous buck regulator using a phase-lockable controlled on-time, current mode architecture capable of supplying up to 1.5A of output current. The operating supply voltage range is from 4V to 15V, making it suitable for a wide range of power supply applications.

The operating frequency is programmable from 800kHz to 4MHz with an external resistor enabling the use of small surface mount inductors. For switching noise sensitive applications, the LTC3601 can be externally synchronized over the same frequency range. An internal phase-locked loop aligns the on-time of the top power MOSFET to the internal or external clock. This unique constant frequency/ controlled on-time architecture is ideal for high step-down ratio applications that demand high switching frequencies and fast transient response.

The LTC3601 offers two operational modes: Burst Mode operation and forced continuous mode to allow the user to optimize output voltage ripple, noise, and light load efficiency for a given application. Maximum light load efficiency is achieved with the selection of Burst Mode operation while forced continuous mode provides minimum output ripple and constant frequency operation.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

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

Part Number Package Code Temp Package
Drawing
RoHS
LTC3601EMSE#PBF MS-16E MSE E 05-08-1667 Yes
LTC3601EMSE#TRPBF MS-16E MSE E 05-08-1667 Yes
LTC3601EUD#PBF 3x3 QFN-16 UD E 05-08-1691 Yes
LTC3601EUD#TRPBF 3x3 QFN-16 UD E 05-08-1691 Yes
LTC3601IMSE#PBF MS-16E MSE I 05-08-1667 Yes
LTC3601IMSE#TRPBF MS-16E MSE I 05-08-1667 Yes
LTC3601IUD#PBF 3x3 QFN-16 UD I 05-08-1691 Yes
LTC3601IUD#TRPBF 3x3 QFN-16 UD I 05-08-1691 Yes


LTC3601 Package Drawing
LTC3601 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LTC3601EMSE#PBF MS-16E E $3.29 $2.30 Yes
LTC3601EMSE#TRPBF MS-16E E $2.36 Yes
LTC3601EUD#PBF 3x3 QFN-16 E $3.29 $2.30 Yes
LTC3601EUD#TRPBF 3x3 QFN-16 E $2.36 Yes
LTC3601IMSE#PBF MS-16E I $3.87 $2.71 Yes
LTC3601IMSE#TRPBF MS-16E I $2.77 Yes
LTC3601IUD#PBF 3x3 QFN-16 I $3.87 $2.71 Yes
LTC3601IUD#TRPBF 3x3 QFN-16 I $2.77 Yes
Buy NowRequest Samples
* 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
DC1353A LTC3601EUD Demo Board (QFN) | 4V ≤ VIN ≤ 15V, VOUT = 1.2V/1.8V/3.3V @ 1.5A $100.00
DC1454A LTC3601EMSE Demo Board (MSOP) | 4V ≤ VIN ≤ 15V, VOUT = 1.2V/1.8V/3.3V @ 1.5A $100.00
Buy Now
Click here to view our complete list of demo boards

Designed for Automotive and Transportation Applications

AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LTC3601IMSE#PBF MS-16E I $3.87 $2.71 Yes
LTC3601IMSE#TRPBF MS-16E I $2.77 Yes
Buy NowRequest Samples
* 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.

Applications

  • Distributed Power Systems
  • Lithium-Ion Battery-Powered Instruments
  • Point-of-Load Power Supply

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Design Tools

LTspice

LTspice® software 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

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
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
  • Step 3: If LTspice 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:
LTC3601

LTpowerCAD

The LTpowerCAD 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

To open the project file for this circuit:

Design tools for the following parts are available in LTpowerCAD:
LTC3601

Technical Support