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MIC2085 Datasheet(PDF) 3 Page - Micrel Semiconductor |
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MIC2085 Datasheet(HTML) 3 Page - Micrel Semiconductor |
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3 / 29 page  Micrel, Inc. MIC2085/2086 May 2006 3 M9999-050406 (408) 955-1690 Pin Description (Cont.) Pin Number MIC2086 Pin Number MIC2085 Pin Name Pin Function 4 4 ON ON Input: Active high. The ON pin, an input to a Schmitt-triggered comparator used to enable/disable the controller, is compared to a VTH reference with 100mV of hysteresis. Once a logic high is applied to the ON pin (VON > 1.24V), a start-up sequence is initiated as the GATE pin starts ramping up towards its final operating voltage. When the ON pin receives a low logic signal (VON < 1.14V), the GATE pin is grounded and /FAULT is high if VCC is above the UVLO threshold. ON must be low for at least 20µs in order to initiate a start-up sequence. Additionally, toggling the ON pin LOW to HIGH resets the circuit breaker. 5 5 /POR Power-On Reset Output: Open drain N-Channel device, active low. This pin remains asserted during start-up until a time period tPOR after the FB pin voltage rises above the power-good threshold (VFB). The timing capacitor CPOR determines tPOR. When an output undervoltage condition is detected at the FB pin, /POR is asserted for a minimum of one timing cycle, tPOR. The /POR pin has a weak pull-up to VCC 6 NA PWRGD Power-Good Output: Open drain N-Channel device, active high. When the voltage at the FB pin is lower than 1.24V, the PWRGD output is held low. When the voltage at the FB pin is higher than 1.24V, then PWRGD is asserted. A pull- up resistor connected to this pin and to VCC will pull the output up to VCC. The PWRGD pin has a weak pull-up to VCC. 7 6 /FAULT Circuit Breaker Fault Status Output: Open drain N-Channel device, active low. The /FAULT pin is asserted when the circuit breaker trips due to an overcurrent condition. Also, this pin indicates undervoltage lockout and overvoltage fault conditions. The /FAULT pin has a weak pull-up to VCC. 8 7 FB Power-Good Threshold Input: This input is internally compared to a 1.24V reference with 3mV of hysteresis. An external resistive divider may be used to set the voltage at this pin. If this input momentarily goes below 1.24V, then /POR is activated for one timing cycle, tPOR, indicating an output undervoltage condition. The /POR signal de-asserts one timing cycle after the FB pin exceeds the power-good threshold by 3mV. A 5µs filter on this pin prevents glitches from inadvertently activating this signal. 9, 10 8 GND Ground Connection: Tie to analog ground 11 9 OV OV Input: When the voltage on OV exceeds its trip threshold, the GATE pin is pulled low and the CRWBR timer starts. If OV remains above its threshold long enough for CRWBR to reach its trip threshold, the circuit breaker is tripped. Otherwise, the GATE pin begins to ramp up one POR timing cycle after OV drops below its trip threshold. 12 10 COMPOUT Uncommitted Comparator’s Open Drain Output. 13 11 COMP+ Comparator’s Non-Inverting Input. 14 12 COMP- Comparator’s Inverting Input. 15 Na DIS Discharge Output: When the MIC2086 is turned off, a 550Ω internal resistor at this output allows the discharging of any load capacitance to ground. 16 13 REF Reference Output: 1.24V nominal. Tie a 0.1µF capacitor to ground to ensure stability. 17 14 GATE Gate Drive Output: Connects to the gate of an external N-Channel MOSFET. An internal clamp ensures that no more than 13V is applied between the GATE pin and the source of the external MOSFET. The GATE pin is immediately brought low when either the circuit breaker trips or an undervoltage lockout condition occurs. |
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