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Saturday, February 24, 2018
VOLUME -22 NUMBER 9
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September 2007 Issue
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Seiko Intros Step-Down Switching Regulator
Step-down CMOS switching regulator.
Torrance, CA — Seiko has introduced a new PWM control switching regulator. 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 1.2MHz, 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 easier compared with conventional step-down switching regulators. A ceramic capacitor can be used as an output capacitor. High-density mounting is supported by adopting a small SOT-23-5 package. The S-8550 and S-8551 Series are offered with different pin configurations. Applications include: mobile devices, such as mobile phones, Bluetooth devices, wireless devices, digital audio players, digital still cameras, portable DVD players, and portable CD players.
For more information, contact: Seiko Instruments, 2990 West Lomita Blvd., Torrance, CA 90505
310-517-7771; fax: 310-517-7792 Web:
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