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MAX4830ELV Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX4830ELV Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 11 page FFLG Indicator The MAX4826–MAX4831 feature a current-limit fault output, FFLG. Whenever a current-limit fault is activat- ed, FFLG goes low and the switch turns off. FFLG is an open-drain output transistor and requires an external pullup resistor from FFLG to IN. During shutdown (ON is low), the pulldown on the FFLG output is released to limit power dissipation. FFLG goes low when any of the following conditions occur: • The die temperature exceeds the thermal shut- down temperature limit of +150°C. • The device is in current limit for more than the fault-blanking period. • VIN is below the UVLO threshold. NOLD Indicator The MAX4826–MAX4831 feature a no-load flag output, NOLD (Figure 1). This output is pulled low every time the current coming out of the switch is less than 10mA (MAX4826–MAX4829), or 5mA (MAX4830/MAX4831). NOLD is an open-drain output transistor and requires an external pullup resistor from NOLD to a supply up to +5.5V. Current through the switch is intended to be positive (from IN to OUT), and for currents that are large in magnitude but negative in sign (OUT to IN), NOLD asserts low. For options with the autoretry fea- ture (MAX4827/MAX4829/MAX4831), the NOLD output is high impedance during the tRETRY period when a for- ward-current-limit condition is present. However, NOLD is pulled low if a reverse current-limit condition is pre- sent during the tRETRY period. A constant time filter is present at the output of NOLD that gives a 60µs delay when a no-load condition is asserted. Deassertion of NOLD is not delayed. During shutdown (ON is low), the pulldown on NOLD is released to limit power dissipation. Autoretry (MAX4827/MAX4829/MAX4831) When the forward- or reverse-current-limit threshold is exceeded, the tBLANK timer begins counting (Figure 2). The timer resets if the overcurrent condition disappears 50mA/100mA Current-Limit Switches with NO-LOAD Flag in µDFN _______________________________________________________________________________________ 7 LOAD CURRENT SWITCH STATUS tBLANK tBLANK OFF ON ON PIN VOLTAGE (a) (b) UVLO FFLG PIN STATUS LOAD CURRENT SWITCH STATUS OFF ON IN PIN VOLTAGE FFLG PIN STATUS tBLANK tBLANK Figure 3. MAX4826/MAX4828/MAX4830 Latchoff Fault Blanking Figure 2. MAX4827/MAX4829/MAX4831 Autoretry Fault Blanking Diagram LOAD CURRENT SWITCH STATUS tBLANK OFF ON tRETRY CURRENT LIMIT SHORT CONDITION REMOVED tBLANK tBLANK VIN VON LOAD CURRENT NOLD STATUS NO-LOAD THRESHOLD CURRENT LIMIT 60 μs 60 μs Figure 1. MAX4826–MAX4831 No-Load Flag Response |
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