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MAX1922 Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX1922 Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 9 page Detailed Description The MAX1922 p-channel MOSFET power switch limits output current to 1.4A min and 2.1A max. When the out- put current increases beyond the current limit (ILIMIT), the current also increases through the replica switch (IOUT / 13000). The current-limit error amplifier com- pares the voltage to the internal 1.24V reference and regulates the current back to the ILIMIT (Figure 1). These switches are not bidirectional; therefore, the input voltage must be higher than the output voltage. Continuous Short-Circuit Protection The MAX1922 is a short-circuit-protected switch. In the event of an output short-circuit condition, the current through the switch is foldback-current-limited to 1A continuous. Thermal Shutdown The MAX1922 has a thermal shutdown feature. The switch turns off and the OC output goes low immediate- ly (no overcurrent blanking) when the junction tempera- ture exceeds +165°C. When the MAX1922 cools 20°C, the switch turns back on. If the fault short-circuit condi- tion is not removed, the switch cycles on and off, result- ing in a pulsed output. OC Indicator The MAX1922 provides an overcurrent output ( OC). A 100k Ω pullup resistor from OC to IN provides a logic control signal. This open-drain output goes low when any of the following conditions occur: • The input voltage is below the 2.4V undervoltage lockout (UVLO) threshold. • The die temperature exceeds the thermal shutdown temperature limit of +165°C. • The device is in current limit for greater than 10ms. OC Blanking The MAX1922 features 10ms overcurrent blanking. Blanking allows brief current-limit faults, including momentary short-circuit faults that occur when hot- swapping a capacitive load, and ensures that no OC is issued during power-up. When a load transient causes the device to enter current limit, an internal counter starts. If the load fault persists beyond the 10ms over- current blanking timeout, the OC output asserts low. Ensure that the MAX1922 input is adequately bypassed to prevent input glitches from triggering spurious OC Pin Description MAX1922 P P P OUT GND 1.24V N ON CURRENT-LIMIT AMPLIFIER REPLICA AMPLIFIER ON EN HOT IN CONTROL CIRCUITRY OC 10ms TIMER Figure 1. Functional Diagram 1A Current-Limited Switch for 2 USB Ports 6 _______________________________________________________________________________________ PACKAGE TDFN SO NAME FUNCTION 6 1 GND Ground 1, 3, 9 2, 3 IN Input. p-channel MOSFET source—connect all IN pins together and bypass with a 1µF capacitor ground. 5 4 EN Active-Low Switch Enable Input. A logic-low turns on the switch. 75 OC Overcurrent-Indicator Output. This open-drain output goes low when the device is in thermal shutdown or undervoltage lockout, or during a sustained (10ms) current-limit condition. 2, 4, 8, 10 6, 7, 8 OUT Switch Output. p-channel MOSFET drain—connect all OUT pins together and bypass with a 0.1µF capacitor to ground. — —EP TDFN Only. Exposed paddle. Connect to the GND plane for optimum thermal dissipation. This does not remove the requirement for a proper ground. |
Similar Part No. - MAX1922_09 |
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Similar Description - MAX1922_09 |
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