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Rohm power management switches support Express Card

Posted: 11 May 2004 ?? ?Print Version ?Bookmark and Share

Keywords:rohm? power management switch? bd4153fv? bd4153efv?

Rohm Co. Ltd has developed what it claims as the industry's first power management switches - the BD4153FV/EFV.

Providing control of power supply to the Express Card, the switches incorporate a function of control in the built-in power switch components. According to the company, this enables the IC to detect the existence or nonexistence of the card without any signal from the card controller.

Rohm explained that the conventional PCI (or PCI-X or PCI-X2.0) bus configuration uses an independent pre-stage card controller to connect the PC card (PCMCIA). The PCI-Express bus and Express Card are specified to connect the PC card directly with no controller. Therefore, the company said, the development of the power management function had been required for the Express Card.

The built-in three-channel power switch component provides an ON resistance of 35mW for the 3.3V line and 42mW for 1.5V line to turn power supply to the Express Card ON and OFF. The product also includes a FET for output discharge use, a slow-start circuit to prevent malfunctioning caused by a quick rise in power supply, and a variety of protection functions, including low-input malfunction prevention circuit, overcurrent protection circuit, overcurrent flag detection function and thermal protection circuit.

The company expects mass production of the BD4153FV/EFV to start in October 2004, with a monthly rate of 300,000 units. The HTSSOP-B24 (BD4153EFV) package incorporating a heat dissipation metal component as well as the SSOP-B24 (BD4153FV) package is available.

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