LT8350 Buck-Boost Silent Switcher® Converter

ADI's LT8350 is a monolithic 4-switch synchronous buck-boost converter with Silent Switcher architecture to minimize EMI emissions while delivering high efficiency at high-switching frequency. The switcher can regulate the output voltage, input or output current from input voltages above, below, or equal to the output voltage. The proprietary peak current mode control scheme allows adjustable and synchronizable 200 kHz to 2 MHz fixed frequency operation or spread spectrum frequency modulation (SSFM) operation. With a 3 V to 40 V input voltage range, 1 V to 18 V output voltage capability, and seamless low noise transitions between operation regions, the LT8350 is ideal for voltage regulator, battery, and supercapacitor charger applications in automotive, industrial, telecom, and battery-powered systems.

The LT8350 provides input or output current monitor and power good flag. Robust fault protection is provided to detect output short-circuit condition, during which the LT8350 retries, latches off, or keeps running.

Evaluation circuit EVAL-LT8350-AZ is a 40 V synchronous buck-boost converter featuring the LT8350. It drives up to 2.5 A load at 12 V output when V_IN is between 9 V and 40 V and will run down to 3 V_IN with reduced output current. EVAL-LT8350-AZ runs at 350 kHz switching frequency with spread spectrum frequency modulation (SSFM) disabled. When enabled, SSFM spreads the switching frequency of the LT8350 from f_SW to f_SW +25% for reduced EMI emission.