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MAX4789 Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX4789 Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 11 page Applications Information Input Capacitor To limit the input voltage drop during momentary output short-circuit conditions, connect a capacitor from IN to GND. A 0.1µF ceramic capacitor is adequate for most applications; however, higher capacitor values further reduce the voltage drop at the input and are recom- mended for lower voltage applications. Output Capacitance Connect a 0.1µF capacitor from OUT to GND. This capacitor helps prevent inductive parasitics from pulling OUT negative during turn-off, thus preventing the MAX4789–MAX4794 from tripping erroneously. If the load capacitance is too large, then current may not have enough time to charge the capacitance and the device assumes that there is a faulty load condition. The maximum capacitive load value that can be driven from OUT is obtained by the following formula: Layout and Thermal Dissipation To optimize the switch response time to output short- circuit conditions, it is very important to keep all traces as short as possible to reduce the effect of undesirable parasitic inductance. Place input and output capacitors as close as possible to the device (no more than 5mm). IN and OUT pins must be connected with short traces to the power bus. During normal operation, the power dissipation is small and the package temperature change is minimal. If the output is continuously shorted to ground at the maxi- mum supply voltage, the operation of the switches with the autoretry option does not cause problems because the total power dissipated during the short is scaled by the duty cycle: where VIN = 5.5V, IOUT = 450mA, tBLANK = 14ms, and tRETRY = 98ms. Attention must be given to the MAX4789, MAX4791, and MAX4793 where the latch-off condition must be manually reset by toggling ON from high to low. If the latch-off time duration is not sufficiently high, it is possi- ble for the device to reach the thermal-shutdown threshold and never be able to turn the device on until it cools down. Chip Information PROCESS: BiCMOS P VI t tt mW MAX IN MAX OUT MAX BLANK RETRY BLANK = ×× + = __ 302 C It V MAX FWD MIN BLANK MIN IN < × __ 200mA/250mA/300mA Current-Limit Switches 8 _______________________________________________________________________________________ LOAD CURRENT SWITCH STATUS ON PIN VOLTAGE tBLANK tBLANK OFF ON (a) (b) UVLO LOAD CURRENT SWITCH STATUS IN PIN VOLTAGE OFF ON tBLANK tBLANK FLAG PIN STATUS FLAG PIN STATUS Figure 3. MAX4789/MAX4791/MAX4793 Latch-Off Fault Blanking |
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