Features and Benefits
- 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
The LTC3613 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.
- Distributed Power System
- Point-of-Load Converters
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 (1)
Demonstration circuit 1700A is a fast, high efficiency synchronous buck DC/DC converter with 4.5V to 24V input range. It can supply 15A maximum load current at 1.5V output. The demo board features the LTC3613EWKH regulator. No external MOSFETs are required.
The controlled on-time constant frequency valley current mode architecture allows for both fast transient response and constant frequency switching in steady-state operation.
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.