3V to 42V Input Quad Synchronous Step-Down DC-DC

Linear Technology Corporation announces the LT8602, a 42V-input capable, high-efficiency quad-output synchronous monolithic step-down switching regulator. Its quad-channel design combines two high-voltage 2.5A and 1.5A channels with two lower-voltage 1.8A channels to provide four independent outputs, delivering voltages as low as 0.8V. Its synchronous rectification topology delivers up to 93% efficiency while Burst Mode® operation keeps quiescent current under 30µA (all channels) in no-load standby conditions, making it suited for always-on systems.

For noise-sensitive applications, the LT8602 utilizes its pulse-skipping mode to minimize switching noise and meet the CISPR25, Class 5 EMI requirements. Switching frequency can be programmed from 250kHz to 2.2MHz and is synchronizable throughout this range. The LT8602’s 60ns minimum on-time enables 16Vin to 0.8Vout step-down conversions while switching at 2MHz, enabling designers to avoid critical noise-sensitive frequency bands such as AM radio, while using a very compact solution footprint. Its 3V to 42V input voltage range makes it well-suited for automotive applications that must regulate through cold-crank and stop-start scenarios with minimum input voltages as low as 3V and load dump transients in excess of 40V.

Each channel of the LT8602 maintains a minimum dropout voltage of only 200mV (at 1A) under all conditions, enabling it to excel in scenarios such as automotive cold-crank. Programmable power-on reset and power good indicators for each channel ensure overall system reliability. The LT8602’s 40-lead thermally enhanced 6mm x 6mm QFN package and high switching frequency keep external inductors and capacitors small, providing a compact, thermally-efficient footprint.