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Micrel, Inc.
MIC2085/2086
 
 
May 2006 
2
M9999-050406
(408) 955-1690
 
Ordering Information 
Part Number
Standard
Pb-Free
Fast Circuit Breaker Threshold     Discharge Output
Package
MIC2085-xBQS    MIC2085-xYQS
x = J, 95mV
x = K, 150mV*
x = L, 200mV*
x = M, Off
NA
16-Pin QSOP
MIC2086-xBQS    MIC2086-xYQS
x = J, 95mV
x = K, 150mV*
x = L, 200mV*
x = M, Off
Yes
20-Pin QSOP
 
* Contact factory for availability.
 
 
 
Pin Configuration
 
  MIC2085
 
 
 
 
 
  MIC2086
  16-Pin QSOP (QS)   
 
 
 
  20-Pin QSOP (QS)
 
 
 
Pin Description 
Pin Number
MIC2086
Pin Number
MIC2085
Pin Name     Pin Function
1
1
CRWBR
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 45礎 current source charges the capacitor. Once the
voltage reaches 470mV, the current increases to 1.5mA.
2
2
CFILTER     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 5祍.
3
3
CPOR
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 20祍.
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