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MAX4826 Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX4826 Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 11 page Detailed Description The MAX4826–MAX4831 are forward-/reverse-current- limited switches that operate from a +2.3V to +5.5V input voltage range and guarantee a 50mA and 100mA minimum current-limit threshold for different options. The voltage drop across an internal sense resistor is compared to two reference voltages to indicate a for- ward- or reverse-current-limit fault. When the load cur- rent exceeds the preset current limit for greater than the fault-blanking time, the switch opens. The MAX4827/MAX4829/MAX4831 have an autoretry function that turns on the switch again after an internal retry time expires. If the faulty load condition is still pre- sent after the blanking time, the switch turns off again and the cycle is repeated. If the faulty load condition is not present, the switch remains on. The MAX4826/MAX4828/MAX4830 do not have the autoretry option, and the switch remains in latchoff mode until ON 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 MAX4826–MAX4831 limit the reverse current (VOUT to VIN) from exceeding the maximum IREV value. The switch is shut off and FFLG is asserted if the reverse- current-limit condition persists for more than the blank- ing time. This feature prevents excessive reverse cur- rents 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 (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. Table 1 illustrates the ON/OFF state of the MAX4826– MAX4831 current-limit switches. 50mA/100mA Current-Limit Switches with NO-LOAD Flag in µDFN 6 _______________________________________________________________________________________ Pin Description PIN NAME FUNCTION 1 IN Input. Bypass IN with a 0.1µF ceramic capacitor to ground. 2 GND Ground 3 OUT Switch Output. Bypass OUT with a 0.1µF capacitor to ground 4 FFLG Current-Limit Fault Output. FFLG is an open-drain output. FFLG goes low when the device stays in forward- or reverse-current limit for more than the blanking time period. FFLG is high impedance when a fault is not present or when ON is low. 5 NOLD No-Load Flag Output. NOLD is an open-drain output. NOLD goes low when a load of less than 10mA (MAX4826–MAX4829) or 5mA (MAX4830/MAX4831) is delivered to the output. NOLD is high impedance when a fault is not present or when ON is low. 6 ON Active-High Switch-On Input. Drive ON high to turn the switch on. ON FAULT SWITCH ON/OFF SUPPLY CURRENT MODE Low X OFF Shutdown High Undervoltage lockout OFF Latchoff High Thermal OFF immediately (tBLANK period does not apply). Latchoff OFF after tBLANK period has elapsed. Latchoff High Current limit ON during tBLANK period, OFF during tRETRY period for the MAX4827/MAX4829/MAX4831. Cycle repeats until fault is removed. See the Autoretry (MAX4827/ MAX4829/MAX4831) section Table 1. MAX4826–MAX4831 Switch Truth Table |
Similar Part No. - MAX4826_09 |
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Similar Description - MAX4826_09 |
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