2.5A, 15V Monolithic Synchronous Step-Down Regulator
Features and Benefits
- 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
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.
- Distributed Power Systems
- Lithium-Ion Battery-Powered Instruments
- Point-of-Load Power Supply
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (2)
Demonstration circuit 1353 is a step-down converter, using the LTC3601 monolithic synchronous buck regulator in the 16-lead MSOP exposed pad package. The DC1353A has a maximum input voltage 15V, and is capable of delivering up to 1.5A of output current at a minimum input voltage of 4V. The output voltage of the DC1353A can be set as low as 0.6V, the reference voltage of the LTC3601. At low load currents, the DC1353A operates in discontinuous mode, and during shutdown, it consumes less than 40 uA of quiescent current.
Demonstration circuit 1353 is a step-down converter, using the LTC3601 monolithic synchronous buck regulator in the 3mm x 3mm QFN-16 package. The DC1353A has a maximum input voltage 15V, and is capable of delivering up to 1.5A of output current at a minimum input voltage of 4V. The output voltage of the DC1353A can be set as low as 0.6V, the reference voltage of the LTC3601. At low load currents, the DC1353A operates in discontinuous mode, and during shutdown, it consumes less than 40 uA of quiescent current.
Tools & Simulations
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.
To launch ready-to-run LTspice demonstration circuits for this part:
Step 1: Download and install LTspice on your computer.
Step 2: Click on the link in the section below to download a demonstration circuit.
Step 3: If LTspice does not automatically open after clicking the link below, 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.
Models for the following parts are available in LTspice:
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.
To open the project file for this circuit:
Step 1: Download and install LTpowerCAD on your computer.
Step 2: Click on the link(s) in the section below to download part-specific project files.
Step 3: If the project file doesn't run, right-click the link and select "Save Target As." Then start the LTpowerCAD tool and open the project file by selecing "Open Project" from the "File" menu.
Design tools for the following parts are available in LTpowerCAD:
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.
Sample & Buy
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 Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.