3.5-V to 65-V, dual-output, stackable, synchronous buck DC/DC controller with ultra-low IQ

The LM5143 is a

65-V

DC/DC synchronous buck controller for high-current single or dual

outputs. Deriving from a family of wide-VIN range

controllers, the device uses an interleaved, stackable, peak current-mode control

architecture for easy loop compensation, fast transient response,

excellent load and line regulation, and accurate current sharing

with paralleled phases for higher output current. A high-side switch

minimum on time of 65 ns provides large step-down ratios, enabling

the direct conversion from 12-V, 24-V,

or 48-V

inputs to low-voltage rails for reduced system complexity and cost.

The LM5143 continues to operate

during input voltage dips as low as 3.5 V, at nearly 100% duty cycle

if needed.

The 15-µA no-load

quiescent current with the output voltage in regulation extends

operating run-time in battery-powered systems. Power the LM5143 from

the output of the switching regulator or another available source

for even lower input quiescent current and power loss.