Cherry Semiconductor Announces Dual-Input Linear Regulator With Auxiliary
28 February 2000
Cherry Semiconductor Announces First Dual-Input Linear Regulator With Auxiliary Control
EAST GREENWICH, R.I.--Feb. 28, 2000--Highly integrated solution provides higher current capability and
meets next-generation Ethernet NIC and PCI card requirements .
Cherry Semiconductor , a leading supplier of power management ICs to computer and power supply manufacturers, today announced the industry's first dual input linear regulator with auxiliary control. With two inputs and auxiliary control, the CS5233 is designed to seamlessly power network interface cards (NICs) and other Peripheral Component Interconnect (PCI) bus cards in compliance with Intel's Instantly Available PC (IAPC) standard, as well as next-generation PCs compliant with Intel's ATX specification. The ATX bus specification defines two +5V sources (VINPUT, and VSTANDBY), and one auxiliary +3.3V source (3.3VAUX).
The CS5233 provides a glitch-free 3.3V (+/-2%) output from one of three possible supplies: VINPUT, VSTANDBY or 3.3VAUX. Its on-chip linear regulator powers output loads directly when either VINPUT or VSTANDBY is available, alternatively VAUXILIARY delivers power to an external PFET that transmits its 3.3VAUX supply to the load. A single CS5233 replaces a two diode, wired OR circuit that feeds a single input regulator. This approach eliminates voltage headroom and threshold problems associated with the diodes that are needed for channel switching.
Superior performance, greater load currents, thermal shut down and low thermal resistance packaging are key attributes of the CS5233. Available in either 8-lead narrow SOIC or 5-lead D2PAK packages, the CS5233 provides up to 500mA or 1.5A load current, respectively, with 1mV line regulation and 5mV load regulation at 10mA IOUT. Both versions feature 800mA (SOIC) and 2.4A (D2PAK) current limit protection and an on-chip thermal monitor that enacts shutdown in the event that junction temperatures reach 180(Degree)C. An internal composite NPN-PNP pass transistor contributes to lower dropout voltage and requires less supply current than standard PNP devices.
Fred Baechtold, senior marketing engineer at Cherry Semiconductor, said, "The PC industry has responded to the business need for desktops to connect to networks with NICs that promise greater availability at higher bandwidths. The CS5233 helps make better connectivity possible by providing dual input auxiliary control to power the NIC from one of the standby sources during the powered-down state of the power rails. It also delivers the high current outputs that faster data rate NICs require."
The CS5233 5-lead D2PAK is also pin-for-pin and backward compatible with Cherry's CS5231 5-lead D2PAK linear regulator with auxiliary control.
Prices in 10,000 piece quantities are $1.23 for the 1.5A linear regulator and $.88 for the 500mA linear regulator. CS5233 data sheets can be downloaded at www.cherry-semi.com/product/PDF/CS-5233PDF.pdf. Samples and production volumes are available from stock.
About Cherry Semiconductor
Cherry Semiconductor Corporation designs and manufactures standard and custom integrated circuits for the automotive, communications, computer and power management markets worldwide. As both a QS-9000 and ISO 9001 certified facility, Cherry Semiconductor pursues a corporate quality goal of 2.0 defects per billion on all new product. Cherry Semiconductor Corporation is a wholly owned subsidiary of The Cherry Corporation, Waukegan, Illinois. E-mail: info@cherry-semi.com
More Information On Our Web Site: http://www.cherry-semi.com