The LT8616, a 42-V input capable, 95% efficiency dual synchronous monolithic step-down switching regulator is a dual channel design that delivers independent 2.5-A and 1.5-A continuous current to outputs as low as 0.8 V. Its Burst Mode operation keeps quiescent current <6.5 µA in no-load standby conditions, making it suitable for always-on systems. The switching frequency can be programmed to operate from 200 kHz to 3 MHz. The device uses dual internal top and bottom high efficiency power switches with the necessary boost diodes, oscillator, control and logic circuitry integrated into a single die.
The step-down converter features a 35-ns minimum on-time that enables 16 VIN to 1.8 VOUT step-down conversions, while switching at 2 MHz helps designers avoid critical noise-sensitive frequency bands, such as AM radio. Its 3.4 to 42-V input voltage range makes it ideal for automotive applications that must regulate through cold-crank and stop-start scenarios with minimum input voltages as low as 3.4 V and load dump transients in excess of 40 V.
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