Fairchild Announces Digitally Programmable Buck Regulator For DVS Applications
Fairchild Semiconductor announced what it is describing as a highly efficient power management solution for new Dynamic Voltage Scaling (DVS) platforms found in cell phones, portable media players (PMPs) and other portable applications. The FAN5355, an 800/1000mA 3MHz Buck converter, has been designed with a proprietary ultra-fast architecture that is said to consume very low quiescent current and yet deliver ultra-fast transient response.
Typical quiescent current in PFM mode is 37µA and even with this small standby current, it is claimed that the FAN5355 is able to provide best-in-class transient response, making the application more resilient to unexpected fluctuations in load. In addition, this architecture creates lower ripple during PFM mode, reducing system noise and improving light load efficiency to 85% even at loads of only 1mA. For more moderate to heavy loads, careful optimization of the power train contributes to a conversion efficiency of more than 90% 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. By tailoring the power supply voltage level to the processing state of the core, energy consumption is reduced leading to longer battery life. In order to maximize the effectiveness of the DVS, the FAN5355’s digitally programmable output voltage has a range of 0.75 to 1.975V and can be adjusted in 12.5mV increments. To accommodate the needs of portable applications, the FAN5355 is available in 3 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. The product is designed to meet the requirements of the European Union’s Directive on the restriction of the use of certain substances (RoHS).
Pricing (1000, pcs.) for the FAN5355 in MLP packaging is US $0.84, and $0.94 for the FAN5355 in WL-CSP packaging, with a delivery time of 8 weeks ARO.
