Application Note AND9093/D
August 2012
In today's market, power management is more important than ever. Portable systems strive to extend battery life while meeting an ever increasing demand for higher performance. Load switches provide a simple and inexpensive method for the system to make the appropriate power management decisions based on which peripherals or sub-circuits are currently in use. Load switches are found in notebooks, cell phones, hand held gaming systems and many other portable devices.
The load switch is controlled by the system, and connects or disconnects a voltage rail to a specific load. By turning unused circuitry off, the system as a whole can run more efficiently. The load switch provides a simple means to power a load when it is in demand and allows the system to maximize performance.
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Example Load Switch Circuit
