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IMP2525A-2BNIMP2526-1BM Datasheet(PDF) 10 Page - A1 PROs co., Ltd. |
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IMP2525A-2BNIMP2526-1BM Datasheet(HTML) 10 Page - A1 PROs co., Ltd. |
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10 / 32 page  IMP2525 IMP2525 4 408-432-9100/www.impweb.com © 2000 IMP, Inc. Detailed Descriptions The IMP2525 is a high-side N-channel MOSFET switch that inter- faces with a USB controller by means of a Switch-Enable input and a Fault-Flag output. The Enable input turns ON the power MOSFET with either a logic “1” for the IMP2525-1 or logic “0” for the IMP2525-2. Any one of three fault conditions will activate the open-drain Fault-Flag Output to alert the controller that the power MOSFET has been turned OFF. Input and Output The IN (input) pin is the power supply connection to the logic cir- cuitry and the “High-Side” of the switch (the Drain of the power MOSFET). The OUT (output) pin is the “Low-Side” of the switch (the Source of the power MOSFET). In a typical circuit, current flows through the switch from IN to OUT toward the load. The switch is referred to as a “High-Side” switch since it drives the positive (or high) side of the load. The output MOSFET source can be forced to a higher voltage than the drain (VOUT > VIN) when the output is OFF with little leakage current. If, however, VIN drops below 2.3V, reverse current may flow out the IN pin regard- less of the enable state. When the power switch is ON, current can flow in either direction. Fault Flag - FLG Pin The Fault Flag pin, FLG, connects to an N-channel, open-drain MOSFET and goes LOW (“0”) for an occurrence of one or more of three conditions: undervoltage, current limit, or thermal shut- down. The FLG output MOSFET is capable of sinking a 10mA load to typically 100mV above ground. Table 1 gives the states of the FLG and OUT pins when a fault condition is detected. Thermal Shutdown Thermal shutdown is active when the output switch is enabled (turned ON). Thermal shutdown shuts off the output MOSFET and sets the Fault Flag if the on-chip temperature sensor exceeds 135 °C. The switch is held OFF until the die temperature drops to 125 °C or below. This 10°C of hysteresis will result in ON-OFF short-circuit cycling if the short-circuit condition is not removed or the bus-controller does turn off the switch with the Enable input. Over temperature detection is active only if the chip is enabled. Undervoltage Lockout The Undervoltage lockout (UVLO) prevents the output MOSFET from being put into the ON state until the positive sup- ply voltage, VIN, exceeds 2.5V. When the output switch is in the ON state and the positive supply voltage drops below 2.3V, the UVLO circuitry will assert the Fault Flag, FLG, and shut OFF the output MOSFET. The FLG output will only assert an active LOW state when the MOSFET switch is in the ON state. Undervoltage detection is active only if the chip is enabled. Current Limiting Current limiting is achieved by sensing the voltage drop from Drain-to-Source of the power MOSFET. When the internal thresh- old is exceeded the power MOSFET is turned OFF. Table 1. Fault Flag Conditions - Switch Enabled Condition Cause FLG pin “0” Until Switch State (FLG = “0”) Thermal Shutdown TJ > 135 °CTJ ≤ 125°C Turns OFF Undervoltage Lockout (UVLO) VIN < 2.3V VIN > 2.5V Turns OFF Current Limiting IO > 0.5A (step load) Enable off or Stays ON IO > 0.63A (ramped load) Thermal Shutdown |
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