Product category:
Power Supply ICs and Controllers
News Release from: Fairchild Semiconductor | Subject: FAN5355
Edited by the Electronicstalk Editorial
Team on 14 April 2008
Power chip performs dynamic voltage
scaling
Buck convertor consumes very low quiescent current and yet delivers ultrafast transient response.
Fairchild Semiconductor has developed a highly efficient power management solution for new dynamic voltage scaling (DVS) platforms found in today's cellphones, portable media players (PMPs) and other portable applications The FAN5355, an 800/1000mA 3MHz buck convertor, has been designed with a proprietary ultrafast architecture that consumes very low quiescent current and yet delivers ultrafast transient response
This article was originally published on Electronicstalk on 28 Feb 2001 at 8.00am (UK)
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Typical quiescent current in PFM mode is 37uA and even with this meagre standby current, 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 drastically improving light load efficiency to 85% even at loads of only 1mA.
For more moderate to heavy loads, careful optimisation 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 maximise 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 uses lead-free (Pb-free) terminals and has been characterised for moisture sensitivity in accordance with the Pb-free reflow requirements of the joint IPC/JEDEC standard J-STD-020.
Pricing in 100-off lots begins at US $0.84 for the FAN5355 in MLP packaging and US $0.94 in WL-CSP packaging.
Samples are available now.
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