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AAT4280AIJS-3-T1 Datasheet(PDF) 9 Page - Advanced Analogic Technologies |
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AAT4280AIJS-3-T1 Datasheet(HTML) 9 Page - Advanced Analogic Technologies |
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9 / 14 page  AAT4280A Slew Rate Controlled Load Switch 4280A.2005.11.1.3 9 Functional Description The AAT4280A is a family of flexible P-channel MOSFET power switches designed for high-side load switching applications. There are three ver- sions of the AAT4280A with different turn-on and turn-off characteristics to choose from, depending upon the specific requirements of an application. The first version, the AAT4280A-1, has a moderate turn-on slew rate feature, which reduces inrush current when the MOSFET is turned on. This func- tion allows the load switch to be implemented with either a small input capacitor or no input capacitor at all. During turn-on slewing, the current ramps linearly until it reaches the level required for the output load condition. The proprietary turn-on cur- rent control method works by careful control and monitoring of the MOSFET gate voltage. When the device is switched ON, the gate voltage is quickly increased to the threshold level of the MOSFET. Once at this level, the current begins to slew as the gate voltage is slowly increased until the MOSFET becomes fully enhanced. Once it has reached this point, the gate is quickly increased to the full input voltage and R DS(ON) is minimized. The second version, the AAT4280A-2, is a very fast switch intended for high-speed switching applica- tions. This version has no turn-on slew rate control and no special output discharge features. The final switch version, the AAT4280A-3, has the addition of a minimized slew rate limited turn-on function and a shutdown output discharge circuit to rapidly turn off a load when the load switch is dis- abled through the ON/OFF pin. All versions of the AAT4280A operate with input voltages ranging from 1.5V to 5.5V. All versions of this device have extremely low operating current, making them ideal for battery-powered applica- tions. The ON/OFF control pin is TTL compatible and will also function with 2.5V to 5V logic systems, making the AAT4280A an ideal level-shifting load switch. Functional Block Diagram Level Shift IN ON/OFF OUT GND Turn-On Slew Rate Control * *AAT4280A-3 only |
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