MIC2085 Datasheet, PDF (2/29 Pages) Micrel Semiconductor – Single Channel Hot Swap Controllers

Micrel, Inc.
MIC2085/2086
Ordering Information
Part Number
Standard
Pb-Free
MIC2085-xBQS MIC2085-xYQS
MIC2086-xBQS MIC2086-xYQS
* Contact factory for availability.
Fast Circuit Breaker Threshold
x = J, 95mV
x = K, 150mV*
x = L, 200mV*
x = M, Off
x = J, 95mV
x = K, 150mV*
x = L, 200mV*
x = M, Off
Discharge Output Package
NA
16-Pin QSOP
Yes
20-Pin QSOP
Pin Configuration
MIC2085
16-Pin QSOP (QS)
MIC2086
20-Pin QSOP (QS)
Pin Description
Pin Number
MIC2086
1
Pin Number
MIC2085
1
2
2
3
3
Pin Name Pin Function
CRWBR
CFILTER
CPOR
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 (t_OCSLOW) in which an overcurrent event must last to signal a fault
condition and trip the circuit breaker. If no capacitor is connected, then t_OCSLOW
defaults to 5µs.
Power-On Reset Timer: A capacitor connected between this pin and ground
sets the start-up delay (t_START) and the power-on reset interval (t_POR). 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
(V_START), 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 t_START defaults to 20µs.
May 2006
2
M9999-050406
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