Automotive 3-V to 36-V, 4-A, low-noise fixed frequency synchronous step-down converter

The LMQ62440-Q1 is a high-performance,

DC-DC synchronous buck converter with integrated bypass capacitors. With integrated

high-side and low-side MOSFETs, up to 4 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 specifically designed

for minimal EMI. The device incorporates pseudo-random spread spectrum, integrated

bypass capacitors, adjustable SW node rise time, 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 to avoid noise sensitive

frequency bands. In addition 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 only 7 µA

(typical) and high light load efficiency. Seamless transition between PWM and PFM

modes, along with very low MOSFET ON resistances and an external bias input, ensures

exceptional efficiency across the entire load range.

The device is available in a 14-pin

VQFN-HR package with wettable flanks. Electrical characteristics are specified over

a junction temperature range of –40°C to +150°C. Find additional resources in the

Related Documentation.