• 简体中文
• English

LT3686A - 37V/1.2A Step-Down Regulator in 3mm × 3mm DFN and MSE

The LT3686A is a current mode PWM step-down DC/DC converter with an internal power switch. The wide input range of 3.6V to 37V makes the LT3686A suitable for regulating power from a wide variety of sources, including 24V industrial supplies and automotive batteries. Its high maximum frequency allows the use of tiny inductors and capacitors, resulting in a very small solution. Operating frequency above the AM band avoids interfering with radio reception, making the LT3686A particularly suitable for automotive applications.

Cycle-by-cycle current limit, thermal shutdown and DA current sense provide protection against fault conditions. Soft-start and frequency foldback eliminate input current surge during start-up. An optional internal regulated active load at the output via the BD pin keeps the LT3686A at full switching frequency at light loads, resulting in low, predictable output ripple above the audio and AM bands. Internal compensation and an internal boost diode reduce external component count.

The LT3686A offers external synchronization capability, whereas the LT3686 does not.

Features Wide Input Range: Operation from 3.6V to 37V Overvoltage Lockout Protects Circuit Through 60V Transients Low Minimum On-Time: Converts 16VIN to 3.3VOUT at 2MHz 1.2A Output Current Adjustable Frequency: 300kHz to 2.5MHz Constant Switching Frequency at Light Loads Can Be Synchronized to External Clock Tracking and Soft-Start Precision UVLO Short-Circuit Robust IQ in Shutdown <1μA Internally Compensated Thermally Enhanced eMSOP and 3mm × 3mm DFN Packages Typical Application

Applications Automotive Systems Battery-Powered Equipment Wall Transformer Regulation Distributed Supply Regulation Packaging

Demo Boards