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SIP4280-1-T1-E3 Datasheet(PDF) 8 Page - Vishay Siliconix |
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SIP4280-1-T1-E3 Datasheet(HTML) 8 Page - Vishay Siliconix |
8 / 9 page SiP4280 Vishay Siliconix www.vishay.com 8 Document Number: 73476 S–52468—Rev. B, 28-Nov-05 DETAILED DESCRIPTION The SiP4280 is a P–channel MOSFET power switches designed for high–side slew rate controlled load–switching applications. During turn on, the current ramps linearly until it reaches the level required for the output load condition. This is achieved by first applying the threshold voltage on the gate of the MOSFET. Once at this level, the current begins to slew and the gate voltage is then linearly increased until the MOSFET becomes fully enhanced. Once fully enhanced, the gate is quickly increased to the full input voltage and RDS(ON) is minimized. The SiP4280–1 version has a moderate 1ms turn on slew rate feature, which reduces in–rush current when the MOSFET is turned on. This function allows the load switch to be implemented with a small input capacitor, or no input capacitor at all. The SIP4280–3 has in addition to the 100 ms minimized slew rate limited turn on function, a shutdown output discharge circuit to rapidly turn off a load when the load switch is disabled through the ON/OFF pin. Both versions of the SiP4280 operate with input voltages ranging from 1.8 V to 5.5 V. Also, both versions of this device have extremely low operating current, making them ideal for battery–powered applications. In cases where the input voltage drops below 1.8 V, the under voltage lockout function will prevent the P–channel MOSFET device from entering into the saturation region of operation by automatically shutting down SiP4280. The ON/OFF control pin is TTL compatible and will also function with 2.5 volt to 5 volt CMOS logic systems. APPLICATION INFORMATION Input Capacitor While a bypass capacitor on the input is not required, a 1 mF or larger capacitor for CIN is recommended in almost all ap– plications. The Bypass capacitor should be placed as phy– sically close as possible to the SiP4280 to be effective in minimizing transients on the input. Ceramic capacitors are recommended over tantalum because of their ability to withstand input current surges from low impedance sources such as batteries in portable devices. Output Capacitor A 0.1 mF capacitor or larger across VOUT and GND is recom– mended to insure proper slew operation. COUT may be increased without limit to accommodate any load transient condition with only minimal affect on the SiP4280 turn on slew rate time. There are no ESR or capacitor type requirement. Enable The ON/OFF pin is compatible with both TTL and CMOS logic voltage levels. Reverse Voltage Conditions and Protection The P–channel MOSFET pass transistor has an intrinsic diode that is reversed biased when the input voltage is greater than the output voltage. Should VOUT exceed VIN , this intrinsic diode will become forward biased and allow excessive current to flow into the IC thru the VOUT pin and potentially damage the IC device. Therefore extreme care should be taken to prevent VOUT from exceeding VIN. In conditions where VOUT exceeds VIN a Schottky diode in parallel with the internal intrinsic diode is recommended to protect the SiP4280. Vishay Siliconix maintains worldwide manufacturing capability. Products may be manufactured at one of several qualified locations. Reliability data for Silicon Technology and Package Reliability represent a composite of all qualified locations. For related documents such as package/tape drawings, part marking, and reliability data, see http://www.vishay.com/ppg?73476. |
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