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Vishay intros two p-channel load switch families

Posted: 08 Nov 2006 ?? ?Print Version ?Bookmark and Share

Keywords:Vishay? SiP4280A? SiP4282? load? switches?

Vishay's SiP4280A and SiP4282 load switches

Vishay Intertechnology Inc. recently announced two families of p-channel load switches that it said are optimized for high-side operation in 1.5-5V load-switching applications. The SiP4280A and SiP4282 devices will be used to turn on and turn off the power for the display, speakerphone, memory cards and other such functions in portable electronic systems such as cellphones, digital still cameras, hot-swap power supplies, notebook computers and PDAs.

For maximum space savings, the SiP4282 offers typical on-resistance of 140 milliohms; at 5V and 175 milliohms; at 3V in the tiny SC-75 package. For applications requiring lower on-resistance but allowing more board space, the SiP4280A offers typical on-resistance of 80 milliohms; at 5V and 100 milliohms; at 3V in the 6-pin SOT-23 package. Both new load switches offer robust power-handling capacity while ensuring efficient use of battery power, the company said. Integrated slew-rate control allows the devices' output voltage to be ramped up more or less gradually, so designers of handheld products can conserve space by using smaller power-supply capacitors to handle the current sags and surges encountered in the load-switching application.

The SiP4282-1 and SiP4280A-1 offer a slew-rate-limited turn-on time of 1ms, which reduces in-rush current when the device is turned on and thereby allows the use of a small input capacitoror no capacitor at all. The SiP4282-3 and SiP4280A-3 feature a slew-rate-limited turn-on time (typical) of 100?s, along with a shutdown load discharge circuit that enables rapid turn-off of a load circuit when the switch is disabled.

The SiP4280A devices operate with input voltages from 1.5V to 5.5V, while the SiP4282 devices operate down to 1.8V. Typical quiescent current is 2.5?A for the SiP4282 and 0.025?A for the SiP4280A. These extremely low current levels allow for longer on-times in battery-powered equipment. The SiP4282 also provides an under-voltage lock-out (UVLO) feature that turns the switch off when an input under-voltage condition exists. Because the UVLO value is a low 1.4V, the end system can be operated using lower-voltage batteries. The ON/OFF control pin for each device is TTL-compatible and will also function with 2.5-5V CMOS logic systems. The devices' ESD rating is 4kV.

Samples and production quantities of the SiP4282 and SiP4280A load switches are available with lead times of eight weeks for larger orders.

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