LT8614 - 42V, 4A Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current

Features

  • Silent Switcher™ Architecture:
    Ultralow EMI/EMC Emissions
  • High Efficiency at High Frequency
    Up to 96% Efficiency at 1MHz
    Up to 94% Efficiency at 2MHz
  • Wide Input Voltage Range: 3.4V to 42V
  • Ultralow Quiescent Current Burst Mode® Operation:
    2.5μA IQ Regulating 12VIN to 3.3VOUT
    Output Ripple < 10mVP-P
  • Fast Minimum Switch-On Time: 30ns
  • Low Dropout Under All Conditions: 200mV at 1A
  • Safely Tolerates Inductor Saturation in Overload
  • Adjustable and Synchronizable: 200kHz to 3MHz
  • Peak Current Mode Operation
  • Accurate 1V Enable Pin Threshold
  • Internal Compensation
  • Output Soft-Start and Tracking
  • Small 18-Lead 3mm × 4mm QFN

Typical Application

LT8614 Typical Application
LT8614 Typical Application

Description

The LT®8614 step-down regulator features Silent Switcher architecture designed to minimize EMI/EMC emissions while delivering high efficiency at frequencies up to 3MHz. Assembled in a 3mm × 4mm QFN, the monolithic construction with integrated power switches and inclusion of all necessary circuitry yields a solution with a minimal PCB footprint. An ultralow 2.5μA quiescent current—with the output in full regulation— enables applications requiring highest efficiency at very small load currents. Transient response remains excellent and output voltage ripple is below 10mVP-P at any load, from zero to full current.

The LT8614 allows high VIN to low VOUT conversion at high frequency with a fast minimum top switch on-time of 30ns. Operation is safe in overload even with a saturated inductor.

Essential features are included and easy to use: An opendrain PG pin signals when the output is in regulation. The SYNC pin allows clock synchronization and choice of Burst Mode operation or pulse-skipping mode. Soft-start and tracking functionality is accessed via the TR/SS pin. An accurate enable threshold can be set using the EN/UV pin and a resistor at the RT pin programs switch frequency.

Packaging

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

QFN-18

LT8614 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LT8614EUDC#PBF QFN 20 E $6.07 $4.25 View
LT8614EUDC#TRPBF QFN 20 E $4.31 View
LT8614IUDC#PBF QFN 20 I $6.69 $4.68 View
LT8614IUDC#TRPBF QFN 20 I $4.74 View
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
DC2019A LT8614 Demo Board | Micropower Sync Buck, Silent Switcher, 5.8V ≤ VIN ≤ 42V, Vout = 5V @ 4A. Contact Factory
Buy Now
Click here to view our complete list of demo boards

Applications

  • Automotive and Industrial Supplies
  • General Purpose Step-Down
  • GSM Power Supplies

Product Notifications

Please login to your MyLinear account for notifications of datasheet updates, new document releases and LTspice model announcements for your favorite products. If you do not have a MyLinear account you may Sign Up Now.

Forgot your password? Click here.
Need help? Email mylinear@linear.com with questions and comments.

Design Tools

LTspiceIV

LTspice IV 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 IV

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 IV
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
  • Step 3: If LTspice IV 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 IV:
LT8614

Technical Support