100V, 600 mA synchronous buck DC/DC betters 93% efficiency

November 21, 2016 // By Graham Prophet
LT8630 is a 600 mA, 100V input capable synchronous step-down switching regulator using synchronous rectification to deliver efficiency as high as 93% while Burst Mode operation keeps quiescent current under 7 µA in no-load standby conditions.

The device’s 3V to 100V input voltage range suits it for 48V automotive systems, dual battery transportation, industrial and 36V to 72V telecom applications. Its internal high efficiency switches can deliver up to 600 mA of continuous output current to voltages as low as 0.8V. The LT8630’s Burst Mode operation offers ultralow quiescent current, for applications such as automotive always-on systems, which need to extend operating battery life. The LT8630’s design maintains a minimum dropout voltage, enabling it to operate with duty cycles up to 99%. Its variable frequency boundary mode switching topology offers high efficiency over a wide range of input voltages. The LT8630’s 20-lead TSSOP package with high voltage lead spacing offers a compact, thermally efficient footprint for high voltage applications.


High efficiency is maintained down to very low output currents while keeping the output ripple below 5 mV. A soft-start feature controls the ramp rate of the output voltage, eliminating input current surge during start-up, while also providing output tracking. A power-good flag signals when the output voltage is within ±7.5% of the regulated output. Undervoltage lockout can be programmed; shutdown mode reduces the total quiescent current to < 5μA. The LT8630 is available in a 20-lead TSSOP package with exposed pad for low thermal resistance and high voltage lead spacing.


Linear Technology; www.linear.com/product/LT8630