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ON Semiconductor Is Now
AND9093/D. Using MOSFETs in Load Switch Applications APPLICATION NOTE. Introduction In today's market, power management is more important for the same die area. Thus, for high current applications the than ever. Portable systems strive to extend battery life while N-channel transistor is preferred. meeting an ever increasing demand for higher performance. When using an N-channel MOSFET in a load switch Load switches provide a simple and inexpensive method for circuit, the drain is connected directly to the input voltage the system to make the appropriate power management rail and the source is connected to the load. The output decisions based on which peripherals or sub-circuits are voltage is defined as the voltage across the load, and currently in use. Load switches are found in notebooks, cell therefore: phones, hand held gaming systems and many other portable V S + V OUT (eq.)
device. The voltage drop for the N-channel transistor is 60 mV and is 100 mV for the P-channel transistor. As a final example, consider an application with an 850 mA maximum load current. The 30 m N-channel transistor’s power loss is 21.7 mW compared to the 36.1 mW power loss of the 50 m P-channel transistor of similar die size.
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