3V to 65V, 4.5A synchronous step-down converter optimized for power density and low EMI

The LM656x5 are a

family of 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

65V

(70V transient < 100ms), reducing the need for external input surge

protection. The LM656x5 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.