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MIC2584-2LYTS Datasheet(PDF) 4 Page - Micrel Semiconductor |
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MIC2584-2LYTS Datasheet(HTML) 4 Page - Micrel Semiconductor |
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4 / 28 page  MIC2584/2585 Micrel MIC2584/2585 4 March 2005 Pin Number Pin Number Pin Name Pin Function MIC2584 MIC2585 3, 14 3, 22 GATE2, GATE1 Gate Drive (Outputs): Connect each output to the gates of external N-Channel MOSFETs. When ON is asserted, a 14 µA current source is activated and begins to charge the gate of the N-Channel MOSFET connected to this pin. An internal clamp ensures that no more than 10V is applied between the GATE and Source when VCC1 or VCC2 is above 5V. When the circuit breaker trips or when an input undervoltage lockout condition is detected, the GATE1 and GATE2 pins are immediately brought low. 9 13 GND Ground: Tie to analog ground. 7 10 CPOR Power-On Reset Timer (Input): A capacitor connected between this pin and ground sets the start-up delay (t START) and the power-on reset interval (t POR). Once the lagging supply rises above its UVLO threshold and ON asserts, the capacitor connected to CPOR begins to charge. When the voltage at CPOR crosses 0.3V, the start-up threshold (V START), a start cycle is initiated as the GATE outputs begin to ramp while capacitor C POR is immediately discharged to ground. When the voltage at the lagging FB pin rises above its threshold (V FB), capacitor CPOR begins to charge again. When the voltage at CPOR rises above the power-on reset delay threshold (V POR) of 1.235V, the timer resets by pulling CPOR to ground and /POR is deasserted. If C POR = 0, then tSTART defaults to 20µs. 8 11 CFILTER Current Limit Response Timer (Input): A capacitor connected to this pin defines the period of time, t OCSLOW, in which an overcurrent event must last to signal a fault condition and trip the circuit breaker. When an overcurrent condition occurs, a 2.5 µA current source begins to charge this capacitor. If the voltage at this pin reaches 1.235V, the circuit breaker is tripped, both GATE pins immediately shut off, and /FAULT is asserted. If C FILTER = 0, then t OCSLOW defaults to 20µs. 5, 12 7, 18 FB2, FB1 Power-Good Threshold Input (Undervoltage Detect): FB1 and FB2 are internally compared to 1.235V and 0.80V references with 25mV of hyster- esis, respectively. External resistive divider networks may be used to set the voltage at these pins. If either FB input momentarily goes below its thresh- old, then /POR is activated for one timing cycle, t POR, indicating an output undervoltage condition. The /POR signal deasserts one timing cycle after the FB pin exceeds its power-good threshold by 25mV. A 5 µs filter on these pins prevents glitches from inadvertently activating the /POR signal. 10 14 /FAULT Circuit Breaker Fault Status (Output): Active-Low, weak pull-up to VCC1 or open-drain. Asserted when the circuit breaker is tripped due to an overcurrent, undervoltage lockout, or overvoltage event. When deasserted, the MIC2585 will initiate a new start cycle by toggling the ON pin. 11 15 /POR Power-On Reset (Output): Active Low, weak pull-up to VCC1 or open drain. This pin remains asserted during start-up until a time period (t POR) after the lagging FB pin threshold (V FB1 or VFB2) is exceeded. The timing capacitor C POR determines tPOR. When the output voltage monitored at either FB pin falls below V FB, /POR is asserted for a minimum of one timing cycle (tPOR). 4, 13 5, 20 OUT2, OUT1 Output Voltage Monitor (Inputs): For output tracking, connect these pins to their respective output to sense the output voltage. N/A 12 CDLY Output Sequence Delay Timer (Input): This pin is internally clamped to 6V. A capacitor connected to this pin sets a timer delay, t DLY, between VOUT1 and V OUT2 as shown in Figure 5. With this pin pulled up to VCC1 through a resistor, and if C GATE1 = CGATE2, both VOUT1 and VOUT2 ramp up and down with the same dv/dt as depicted in the Tracking Mode diagram while maintaining a maximum voltage differential between V OUT1 and VOUT2. N/A 9 TRK Discharge Tracking Mode Pin (Input): Tie this pin to OUT1 or OUT2 to enable tracking during turn-off cycle. Ground this pin to disable tracking during turn-off. The TRK pin is not to be used as a digital input. |
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Similar Description - MIC2584-2LYTS |
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