Regulators Pack Power Punch For Portables

Integrating numerous functions, the S-8550/8551 series step-down, synchronous-rectification, PWM-control switching regulators include a reference voltage circuit, oscillator, error amplifier, phase-compensation circuit, PWM controller, under-voltage-lockout circuit, current limit circuit, and a power MOSFET. Applications include mobile phones, Bluetooth devices, digital audio players, digital cameras, and portable DVD/CD players. Oscillation frequency is high at 1.2 MHz, accommodating the use of small external parts. Pricing is $.052 each/10,000. SEIKO INSTRUMENTS USA INC., Torrance, CA. (310) 517-7700.