36V, 6A, functional safety compliant, stackable step-down power converter in a small eQFN package

The LM684x0-Q1 are a

family of automotive buck converters

designed for high efficiency, high power density, and ultra-low electromagnetic

interference (EMI). The converters operate over a wide input voltage range of 3V to

36V (42V tolerant) The LM684x0-Q1 is dual phase capable by simply connecting the

compensated error signal between the primary and secondary device. The LM684x0-Q1 comes with pin selectable fixed output voltages

of 3.3V and 5V or in adjustable configuration. The low EMI operation is enabled with

minimized loop inductance and optimized switch node slew rate. A pin-selectable ±5% or ±10% dual-random spread

spectrum (DRSS) significantly reduces peak emissions through a combination of

triangular and pseudo-random modulation while keeping output voltage ripple very

low. The current-mode control architecture with a 30ns typical minimum

on-time allows high conversion ratios at high frequencies coupled with a fast

transient response and excellent load and line regulation.

The LM684x0-Q1 buck converters are specifically intended

for functional safety relevant applications. An array of safety features including

ABIST at start-up, redundant and fast VOUT monitoring, feedback path

failure detection, redundant temperature sensor, thermal shutdown, and current

limiting significantly reduce the residual failure-in-time (FIT).