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MAX4915AELT+T Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX4915AELT+T Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 11 page Latchoff (MAX4914B/MAX4915B/MAX4917B) When the forward or reverse current-limit threshold is exceeded, the tBLANK timer begins counting. The timer resets if the overcurrent condition disappears before tBLANK has elapsed. The switch is shut off if the over- current condition continues up to the end of the blank- ing time. Reset the switch by either toggling ON (Figure 3a) or cycling the input voltage below UVLO, typically 2V (Figure 3b). Fault Blanking All devices feature 14ms (min) fault blanking. Fault blanking allows current-limit faults, including momentary short-circuit faults that occur when hot-swapping a capacitive load, and also ensures that no fault is issued during power-up. When a load transient causes the device to enter current limit, an internal counter starts. If the load-transient fault persists beyond the fault-blank- ing timeout, FLAG asserts low. Load-transient faults less than tBLANK do not cause a FLAG output assertion. Only current-limit faults are blanked. A thermal fault and input voltage drops below the UVLO threshold cause FLAG to assert immediately and not wait for the blanking time. Thermal Shutdown The MAX4914B/MAX4915A/B/MAX4917A/B have a ther- mal-shutdown feature to protect the devices from over- heating. The switch turns off and FLAG goes low immediately (no fault blanking) when the junction temper- ature exceeds +150°C. The switch turns back on when the device temperature drops approximately by 15°C. 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 devices from tripping erroneously. If the load capacitance is too large, the current may not have enough time to charge the capacitance and the device assumes that there is a faulty load condition. The maxi- mum 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 maximum C It V MAX FWD MIN BLANK MIN IN < × __ 100mA/200mA/300mA Current-Limit Switches with Low Shutdown Reverse Current 8 _______________________________________________________________________________________ LOAD CURRENT SWITCH STATUS ON PIN VOLTAGE tBLANK tBLANK OFF ON UVLO LOAD CURRENT SWITCH STATUS IN PIN VOLTAGE OFF ON tBLANK tBLANK FLAG PIN STATUS FLAG PIN STATUS FIGURE 3a FIGURE 3b Figure 3. MAX4914B/MAX4915B/MAX4917B Latchoff Fault Blanking |
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