DC3099A

DC3099A demonstration circuit is a 42V, 5A synchronous step-down Silent Switcher® with spread spectrum frequency modulation featuring the LT®8640A. The demo board is designed for 5V output from a 5.7V to 42V input. Meanwhile the LT8640A can operate down to 3.4V inputs. The wide input range allows a variety of input sources, such as automotive batteries and industrial supplies. The LT8640A is a compact, ultralow emission, high efficiency, and high speed synchronous monolithic stepdown switching regulator. The integrated power switches and inclusion of all necessary circuitry reduce the components count and solution size. Special Silent Switcher architecture minimizes EMI emissions. Selectable spread spectrum mode can further improve EMI performance. Ultralow 2.5μA quiescent current in Burst Mode® operation achieves high efficiency at very light loads. Fast minimum on-time of 30ns enables high VIN to low VOUT conversion at high frequency.

• 4.85V to 5.15V output voltage at R4 = 1Mohm, R5 = 243Kohm
• 2MHz switching frequency at R2 = 17.8Kohm, JP1 = FCM/SYNC
• 94% efficiency at DC at VIN = 12V, IOUT = 3A