Seiko Instruments Announces New DC-DC Converter ICs

Seiko Instruments announced the release of the S-8550/8551 series – 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 MOSFET.

The oscillation frequency is high at 1.2 MHz, so it is claimed that a high efficiency, large output current, step-down switching regulator can be achieved by using small external parts. The company claims that 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 according to 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.

The S-8550/8551 series is priced at $.52 each in 10,000 piece quantities.