Digitally programmable buck regulator

Fairchild Semiconductor gives system design engineers a power management solution for Dynamic Voltage Scaling (DVS) platforms found in today's cell phones, portable media players (PMPs) and other portable applications. The FAN5355, an 800mA/1000mA 3MHz Buck converter, has been designed with a proprietary architecture. Typical quiescent current in PFM mode is 37microampere.

 For more moderate to heavy loads, careful optimization of the power train contributes to a conversion efficiency of more than 90 percent during PWM mode. The FAN5355 is equipped with an I2C interface allowing the system to dynamically adjust the digital core's power supply voltage based on the processor workload. Typical cores benefiting from DVS are application processors, graphics processors and DSPs in mobile applications. In order to maximize the effectiveness of the DVS, the FAN5355's digitally programmable output voltage has a range of 0.75V to 1.975V and can be adjusted in 12.5mV increments.

 To accommodate the needs of portable applications, the FAN5355 is available in 3mm x 3mm MLP packaging and 12 bump, 0.5mm pitch WL-CSP packaging. The FAN5355 utilizes lead-free (Pb-free) terminals and has been characterized for moisture sensitivity in accordance with the Pb-free reflow requirements of the joint IPC/JEDEC standard J-STD-020. All of Fairchild's products are designed to meet the requirements of the European Union's Directive on the restriction of the use of certain substances (RoHS). The price (1000, pcs.) are FAN5355 in MLP packaging: US $0.84 and FAN5355 in WL-CSP packaging: US $0.94. Samples available now.