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MAX4793EUS Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX4793EUS Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 12 page Detailed Description The MAX4789–MAX4794 are forward/reverse current- limited switches that operate from a 2.3V to 5.5V input voltage range and guarantee a 200mA, 250mA, and 300mA minimum current-limit threshold for different options. The voltage drop across an internal sense resistor is compared to two reference voltages to indi- cate a forward or reverse current-limit fault. When the load current exceeds the preset current limit for greater than the fault-blanking time, the switch opens. The MAX4790, MAX4792, and MAX4794 have an autoretry function that turns on the switch again after an internal retry time expires. If the faulty load condition is still present after the blanking time, the switch turns off again and the cycle is repeated. If the faulty load con- dition is not present, the switch remains on. The MAX4789, MAX4791, and MAX4793 do not have the autoretry option and the switch remains in latch-off mode until the ON pin or the input power is cycled from high to low and then high again. The undervoltage lockout (UVLO) circuit prevents erro- neous switch operation when the input voltage goes too low during startup conditions. Reverse Current Protection The MAX4789–MAX4794 limit the reverse current (VOUT to VIN) from exceeding the maximum IREV value. The switch is shut off and FLAG is asserted (MAX4789/ MAX4791/MAX4793) if the reverse current-limit condition persists for more than the blanking time. This feature pre- vents excessive reverse currents from flowing through the device. Switch-On/Off Control Toggle ON high to enable the current-limited switches. The switches are continuously on, only if VIN exceeds the UVLO threshold (typically 2V) and there is no fault. When a forward/reverse current fault is present or the die exceeds the thermal-shutdown temperature of +150°C, OUT is internally disconnected from IN and the supply current decreases to 8µA (latch off). The switch is now operating in one of its off states. The switch-off state also occurs when driving ON low, thus reducing the supply current (shutdown) to 0.01µA. Table 1 illustrates the ON/OFF state of the MAX4789–MAX4794 current-limit switches. FLAG Indicator The MAX4789, MAX4791, and MAX4793 feature a latched fault output, FLAG. Whenever a fault is activat- ed, it latches FLAG output low and also turns the switch 200mA/250mA/300mA Current-Limit Switches 6 _______________________________________________________________________________________ N BLANKING TIME CIRCUITRY REVERSE CURRENT DETECTOR FORWARD CURRENT DETECTOR N +2.0V FLAG OUT IN ON GND MAX4789/MAX4791/ MAX4793 ONLY LOGIC AUTO- RETRY MAX4789–MAX4794 UNDERVOLTAGE LOCKOUT Figure 1. Functional Diagram |
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