Overview

Features and Benefits

  • High Efficiency Synchronous Operation
    • > 90% Efficiency at 30mA, 12VIN to 3.3VOUT
  • Pin Selectable Forced Continuous or Burst Mode® Operation (LT8618C Only)
  • Ultralow Quiescent Current Burst Mode Operation
    • < 2.5μA IQ Regulating 48VIN to 3.3VOUT
    • Output Ripple < 10mVP-P
  • 3.4V to 60V Input Operation Range (65V Max)
  • Fast Minimum Switch-On Time: 35ns
  • Adjustable (All) And Synchronizable (LT8618C Only) Switching Frequency: 200kHz to 2.2MHz
  • Fixed 3.3V Output Voltage Version (LT8618-3.3)
  • Accurate 1V Enable Pin Threshold (All) with Adjustable Hysteresis (LT8618C Only)
  • Internal Compensation
  • Output Soft-Start and Tracking
  • Small 12-Lead 2mm × 2mm LQFN (LT8618C) and 10-Lead 3mm × 2mm DFN Packages
  • AEC-Q100 Qualified for Automotive Applications (LT8618/LT8618-3.3)

Product Details

The LT8618 family are compact, high speed synchronous monolithic step-down switching regulators that deliver up to 100mA to the output with high efficiency at a constant frequency, even up to 2.2MHz. They accept a wide input voltage range up to 65V (transients only, 60V for continuous operation), and consume only 2.5μA of quiescent current when operating in Burst Mode. Top and bottom power switches are included with all necessary circuitry to minimize the need for external components.

The LT8618C includes BST and INTVCC ceramic capacitors for a more compact solution while having SYNC/MODE and HYST pins. The SYNC/MODE pin selects the regulator’s operation between forced continuous mode, for predictive interference in sampling systems, Burst Mode, for increased efficiency at light loads or spread spectrum for Low EMI. It also allows synchronization to an external clock to further increase signal to noise ratio in high-resolution acquisition systems.

A PG flag signals when VOUT is within ±7.5% of the programmed output voltage and when in fault conditions. Thermal shutdown provides additional protection.

  PACKAGE SYNC/HYST 150°C GRADE INTERNAL CAPS FB RESISTORS
LT8618 DFN No Yes No External
LT8618-3.3 DFN No Yes No Internal
LT8618C LQFN Yes No Yes External

Applications

  • Industrial Sensors
  • Industrial Internet of Things
  • 4mA to 20mA Current Loops
  • Flow Meters
  • Automotive Housekeeping Supplies

Product Lifecycle icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits (4)

Tools & Simulations

LTspice

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.

LTspice

Models for the following parts are available in LTspice:

LT8618
LT8618-3.3
LT8618C

Design Resources

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


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Evaluation Boards

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Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.