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STEP-DOWN, BUILT-IN FET, SYNCHRONOUS RECTIFICATION, PWM CONTROL SWITCHING
REGULATORS
S-8550/8551 Series
The S-8550/8551 Series is a CMOS synchronous rectification step-down switching
regulator which mainly consists of a reference voltage circuit, an oscillator, an error amplifier, a phase compensation circuit, a PWM controller, an under voltage lockout circuit (UVLO), a current limit circuit, and a power MOS FET.
The oscillation frequency is high at 1.
2 MHz, so a high efficiency, large output current, step-down switching
regulator can be achieved by using small external parts.
The built-in synchronous rectification circuit makes achieving high efficiency eas...