Load switches ensure
efficient use of batteries
P-channel load switches are optimised for high-side operation in 1.5 to 5V load-switching applications
Vishay Intertechnology has released two new families of P-channel load switches optimised for high-side operation in 1.5 to 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 140mohm at 5V and 175mohm 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 80mohm at 5V and 100mohm 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.
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 sags and surges currently encountered in the load-switching application.
The load switches released today are available in distinct versions featuring flexible turn-on and turn-off characteristics.
The SiP4282-1 and SiP4280A-1 offer a slew-rate-limited turn-on time (typical) of 1ms, which reduces inrush current when the device is turned on and thereby allows for the use of a small input capacitor - or no capacitor at all.
The SiP4282-3 and SiP4280A-3 feature a slew-rate-limited turn-on time (typical) of 100us, along with a shutdown load discharge circuit that enables rapid turn-off of a load circuit when the switch is disabled.
SiP4280A devices operate with input voltages from 1.5 to 5.5V, whereas the SiP4282 devices operate down to 1.8V.
Typical quiescent current is 2.5uA for the SiP4282 and 0.025uA for the SiP4280A.
These extremely low current levels allow for longer on-times in battery-powered equipment.
The SiP4282 also provides an under-voltage lockout (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 to 5V CMOS logic systems.
The devices' ESD rating is 4kV.
Samples and production quantities of the SiP4282 and SiP4280A load switches are available now, with lead times of eight weeks for larger orders.
Pricing for US delivery in 10,000 piece quantities is $1.95.
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