LMQ61460-Q1 Automotive Low EMI Synchronous Step-Down Converter

Texas Instruments' LMQ61460-Q1 is a high-performance DC/DC synchronous buck converter with integrated bypass capacitors. With integrated high-side and low-side MOSFETs, up to 6 A of output current is delivered over a wide input range of 3.0 V to 36 V; 42 V tolerance supports load dump for durations of 400 ms. The device implements soft recovery from dropout eliminating overshoot on the output.

The device is designed for minimal EMI. The LMQ61460-Q1 incorporates a pseudo-random spread spectrum, integrated bypass capacitors, adjustable SW node rise time, a low-EMI VQFN-HR package featuring low switch node ringing, and optimized pinout for ease-of-use. The switching frequency can be synchronized between 200 kHz and 2.2 MHz avoiding noise-sensitive frequency bands. The frequency can be selected for improved efficiency at low operating frequency or smaller solution size at high operating frequency. Auto-mode enables frequency foldback when operating at light loads, allowing an unloaded current consumption of 7 µA (typical) and high light-load efficiency. Seamless transition between PWM and PFM modes, very low MOSFET ON resistances, and an external bias input ensures exceptional efficiency across the entire load range.