Fairchild Semiconductor Premieres the FAN5235 Power-Management IC
Fairchild Semiconductor (San Jose, CA) launched the FAN5235, a new power-management IC designed for LCD PCs, Internet appliances and other devices powered by a notebook PC-type of power adapter. The FAN5235 integrates three PWM switching regulator controllers and two linear regulator controllers to convert the 5.6V to 24V power supplied by the adapter into the voltages used by the circuitry that surrounds the microprocessor in these systems.
The two primary PWM controllers use synchronous-mode rectification to provide 3.3V and 5V at over 5A each, switched out of phase to minimize input ripple-current. The third PWM controller generates an adjustable voltage at 150mA. A proprietary technique is used for sensing output current using the Rds(on) of the external MOSFETs, instead of external current sense resistors.
The FAN5235 also has two integrated linear regulators for stand-by always-on power at 3.3V and 5V for light loads. Additional FAN5235 features include over-voltage, under-voltage, over-current monitors and thermal shutdown protection. A single power-good signal is issued when soft start is completed and all outputs have reached 90 percent of their final value.
The FAN5235 is another product born from the previously announced joint agreement between Fairchild and Intersil Corp. (Irvine, CA). The Intersil version is the ISL6235.
Pricing for the FAN5235 is $3.25 each in quantities of 1,000. The device is currently available, with delivery in seven to eight weeks ARO.
