Features and Benefits
- Wide VIN Range: 3.1V to 17V
- Wide VOUT Range: 0.6V to 99% VIN
- Dual Step-Down Outputs: 3.5A Per Channel
- Integrated 80mΩ/40mΩ N-Channel MOSFETs. Provide Up to 95% Efficiency
- No-Load IQ < 8μA with Both Channels Enabled; IQ < 5.5μA with Only One Channel Enabled
- Programmable Frequency (500kHz to 4MHz) with ±25% Frequency Synchronization Range
- Configurable for a Two Phase Single Output at Up to 7A
- ±1.0% Output Voltage Accuracy
- Current Mode Operation for Excellent Line and Load
- Transient Response
- Internal or Programmable External Loop Compensation
- Thermally Enhanced 3mm × 5mm QFN-24 Package
The LTC7124 is a dual channel, 3.5A per output, high efficiency monolithic step-down regulator capable of operating from input supplies up to 17V. The programmable switching frequency ranges from 500kHz to 4MHz with a ±25% external clock synchronization capability around the programmed frequency. The regulator features ultralow quiescent current for high efficiency over a wide VOUT range.
The step-down regulator operates from an input voltage range of 3.1V to 17V and provides an adjustable output range from 0.6V to 99% of VIN while delivering up to 3.5A of output current per channel. A user selectable mode input is provided to allow the user to trade off output ripple for light load efficiency; Burst Mode® operation provides the highest efficiency at light loads, while forced continuous operation provides the lowest output ripple. The LTC7124 includes spread spectrum modulation for low radiated and conductive noise. The LTC7124 is offered in a thermally enhanced, low profile 24-lead 3mm × 5mm QFN package.
- Battery Powered Systems
- Point-of-Load Supplies
- Portable Instruments
- Handheld Scanners
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 DC2329A features the LTC7124IUDD: a wide input and output voltage range, high efficiency and power density, dual 3.5A DC/DC stepdown monolithic regulator. The input voltage range of the DC2329A is 3.1V to 17V. The default setting of VOUT1 is user selectable from 1.2V, 1.5V and 1.8V at 3.5A max. The default setting of VOUT2 is user selectable from 2.5V, 3.3V and 5.0V at 3.5A max. The default switching frequency of DC2329A is set at 1MHz typical. Programmable peak current limit of either 2.6A or 5A can be achieved by changing the setting of ILIM pin. Selectable internal or external loop compensation allows users more options to optimize the loop bandwidth and output load transient response. A user-selectable mode input is provided to allow users to trade off ripple noise for light load efficiency: pulse skipping mode (PS) or Burst Mode® (BM) of operation delivers higher efficiency at light load while forced continuous conduction mode (FCM) is preferred for noise sensitive applications. The Mode pin can also be used to synchronize the switching frequency to an external clock. Programmable switching frequency ranges from 500kHz to 4MHz with a ±25% synchronization capture range. The constant frequency, peak current mode control architecture and integrated internal or optional external control loop compensation network, allows very fast transient response to line and load changes while maintaining loop stability.
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.
LTpowerCAD Project Files
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.