DatasheetsPDF.com

MIC2086 Dataheets PDF



Part Number MIC2086
Manufacturers Micrel Semiconductor
Logo Micrel Semiconductor
Description (MIC2085 / MIC2086) Single Channel Hot Swap Controllers
Datasheet MIC2086 DatasheetMIC2086 Datasheet (PDF)

MIC2085/MIC2086 Single Channel Hot Swap Controllers General Description The MIC2085 and MIC2086 are single channel positive voltage hot swap controllers designed to allow the safe insertion of boards into live system backplanes. The MIC2085and MIC2086 are available in 16-pin and 20-pin QSOP packages, respectively. Using a few external components and by controlling the gate drive of an external N-Channel MOSFET device, the MIC2085/86 provide inrush current limiting and output voltage slew rate c.

  MIC2086   MIC2086


Document
MIC2085/MIC2086 Single Channel Hot Swap Controllers General Description The MIC2085 and MIC2086 are single channel positive voltage hot swap controllers designed to allow the safe insertion of boards into live system backplanes. The MIC2085and MIC2086 are available in 16-pin and 20-pin QSOP packages, respectively. Using a few external components and by controlling the gate drive of an external N-Channel MOSFET device, the MIC2085/86 provide inrush current limiting and output voltage slew rate control in harsh, critical power supply environments. Additionally, a circuit breaker function will latch the output MOSFET off if the current limit threshold is exceeded for a programmed period of time. The devices’ array of features provide a simplified yet robust solution for many network applications in meeting the power supply regulation requirements and affords protection of critical downstream devices and components. Data sheets and support documentation can be found on Micrel’s web site at www.micrel.com. • Operating temperature range –40°C to 85°C • Active current regulation limits inrush current independent of load capacitance • Programmable inrush current limiting • Analog foldback current limiting • Electronic circuit breaker • Dual-level overcurrent fault sensing • Fast response to short circuit conditions (< 1µs) • Programmable output undervoltage detection • Undervoltage lockout protection • Power-on reset (MIC2085/86) and power-good (MIC2086) status outputs • /FAULT status output • Driver for SCR crowbar on overvoltage Applications • • • • • • RAID systems Cellular base stations LAN servers WAN servers InfiniBand™ Systems Industrial high side switching Features • MIC2085: Pin for pin functional equivalent to the LTC1642 • 2.3V to 16.5V supply voltage operation • Surge voltage protection to 33V Typical Application www.DataSheet4U.com InfiniBand is a trademark of InfiniBand Trade Association PowerPAK is a trademark of Vishay Intertechnology, Inc. Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com May 2006 M9999-050406 (408) 955-1690 Micrel, Inc. MIC2085/2086 Ordering Information Part Number Standard MIC2085-xBQS Pb-Free MIC2085-xYQS x = J, 95mV x = K, 150mV* x = L, 200mV* x = M, Off x = J, 95mV x = K, 150mV* x = L, 200mV* x = M, Off NA 16-Pin QSOP Fast Circuit Breaker Threshold Discharge Output Package MIC2086-xBQS MIC2086-xYQS Yes 20-Pin QSOP * Contact factory for availability. Pin Configuration MIC2085 16-Pin QSOP (QS) MIC2086 20-Pin QSOP (QS) Pin Description Pin Number MIC2086 1 Pin Number MIC2085 1 Pin Name CRWBR Pin Function Overvoltage Timer and Crowbar Circuit Trigger: A capacitor connected to this pin, sets the timer duration for which an overvoltage condition will trigger an external crowbar circuit. This timer begins when the OV input rises above its threshold as an internal 45µA current source charges the capacitor. Once the voltage reaches 470mV, the current increases to 1.5mA. Current Limit Response Timer: A capacitor connected to this pin defines the period of time (tOCSLOW) in which an overcurrent event must last to signal a fault condition and trip the circuit breaker. If no capacitor is connected, then tOCSLOW defaults to 5µs. Power-On Reset Timer: A capacitor connected between this pin and ground sets the start-up delay (tSTART) and the power-on reset interval (tPOR). When VCC rises above the UVLO threshold, the capacitor connected to CPOR begins to charge. When the voltage at CPOR crosses 1.24V, the start-up threshold (VSTART), a start cycle is initiated if ON is asserted while capacitor CPOR is immediately discharged to ground. When the voltage at FB rises above VFB, capacitor CPOR begins to charge again. When the voltage at CPOR rises above the power-on reset delay threshold (VTH), the timer resets by pulling CPOR to ground, and /POR is deasserted. If CPOR = 0, then tSTART defaults to 20µs. 2 2 CFILTER 3 3 CPOR www.DataSheet4U.com May 2006 2 M9999-050406 (408) 955-1690 Micrel, Inc. MIC2085/2086 Pin Description (Cont.) Pin Number MIC2086 4 Pin Number MIC2085 4 Pin Name ON Pin Function 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. 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-.


MIC2085 MIC2086 MIC2282


@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site.
(Privacy Policy & Contact)