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MAX4915AELT+T Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX4915AELT+T Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 11 page Detailed Description The MAX4914B/MAX4915A/B/MAX4917A/B are for- ward/reverse current-limited switches that operate from a +2.3V to +5.5V input voltage range and guarantee a 100mA, 200mA, and 300mA minimum current-limit threshold for different options. The voltage drop across an internal sense resistor is compared to two reference voltages to indicate 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 and FLAG asserts. The MAX4915A/MAX4917A 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 condition is not pre- sent, the switch remains on. During this retry time, FLAG remains low until the fault is removed. The MAX4914B/MAX4915B/MAX4917B do not have the autoretry option, and the switch remains in latchoff 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. Reverse Current Protection All devices limit the reverse current (VOUT to VIN) from exceeding the maximum IREV value. The switch is shut off and FLAG is asserted 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 to the source. When the device is in shutdown (VON < VIL), the current from OUT to IN does not exceed 1µA (max). 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 (latchoff). 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 (typ). Table 1 illustrates the ON/OFF state. FLAG Indicator All devices feature a latched fault output, FLAG. Whenever a fault is activated, it latches the FLAG out- put low and also turns the switch off. FLAG is an open- 100mA/200mA/300mA Current-Limit Switches with Low Shutdown Reverse Current 6 _______________________________________________________________________________________ N BLANKING TIME CIRCUITRY REVERSE CURRENT DETECTOR FORWARD CURRENT DETECTOR N +2.0V FLAG OUT IN ON GND LOGIC AUTO- RETRY MAX4914B MAX4915A/B MAX4917A/B UNDERVOLTAGE LOCKOUT Figure 1. Functional Diagram |
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