AND9093 - Using MOSFETs in Load Switch Applications

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. 1). devices. The load Switch is controlled by the system, and connects In order for the N-channel MOSFET to turn on, the or disconnects a voltage rail to a specific load.

AND9093/D http://onsemi.com 2 Load Switch Control Circuit Considerations There are multiple ways to implement the on/off control block in a load switch circuit.

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