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SP619 Datasheet(PDF) 4 Page - Exar Corporation |
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SP619 Datasheet(HTML) 4 Page - Exar Corporation |
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4 / 7 page  April 2008 Rev L SP619 High Current Power Switch © 2008 EXAR Corporation 4 THEORY OF OPERATI ION The SP619 is a switch capable of handling up to 800mA of current. The SP619 is targeted as a for 5V USB protection power distribution switch. And can be used in general power distribution applications where short circuits are likely to be encountered. Short circuit operation When the SP619 enters a short circuit con- dition, the switch is disabled. The output of the SP619 will not restart until the out- enable pin can be used to re-enable the SP619 into any load condition that is not a fault condition. Refer to the truth table on page 4 for more information on the differ- ent SP619 switch states. The typical deac- tivation time is about 2ms. Enable The enable pin allows easy control of the SP619. The enable pin should not be en- abled high prior to a voltage being pres- ent on the input of the device. The enable pin should not exceed the input voltage by - ode. Doing so will affect the operation of the SP619 and could damage the device. This resistor will pull the enable low when an enable signal is not present. This pre- vents the SP619 from falsely turning on. The enable pin can also be used to restart the part into a load condition that is high in current. Please refer to the truth table on page 4 for more details. Inrush Current The SP619 is a simple resistive switch. When the switch is turned on into a highly inrush current that can be encountered. At 6 volts in, the inrush current was about 250mA into a 100µF capacitor. Output Voltage Rise Time The output voltage of the SP619 has an output capacitance dependency on the slope of VOUT. A simple RC circuit is cre- ated when the switch is turned on. V(t)=VO+VIN ( ( RDS(ON) • COUT -t Where VO is initial Voltage condition typi- cally 0V VIN is the input voltage RDS(ON) is the switch resistance COUT is the output capacitance For 4.2V VIN and 100µF output capacitance 4.17 3.33 2.5 1.67 0.83 0 0 0.33 0.67 1 1.33 1.67 2 time in uS VOUT This is comparable to actual measured 1-e |
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