MIC2085-MBQS(2004) Ver la hoja de datos (PDF) - Micrel
Número de pieza
componentes Descripción
Fabricante
MIC2085-MBQS Datasheet PDF : 28 Pages
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MIC2085/2086
Ordering Information
Part Number
MIC2085-xBQS
MIC2086-xBQS
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
*Contact factory for availability.
Discharge Output
NA
Package
16-pin QSOP
Yes
20-pin QSOP
Micrel
Pin Configuration
CRWBR 1
CFILTER 2
CPOR 3
ON 4
/POR 5
/FAULT 6
FB 7
GND 8
16 VCC
15 SENSE
14 GATE
13 REF
12 COMP–
11 COMP+
10 COMPOUT
9 OV
MIC2085
16-Pin QSOP (QS)
CRWBR 1
CFILTER 2
CPOR 3
ON 4
/POR 5
PWRGD 6
/FAULT 7
FB 8
GND 9
GND 10
20 VCC
19 VCC
18 SENSE
17 GATE
16 REF
15 DIS
14 COMP–
13 COMP+
12 COMPOUT
11 OV
MIC2086
20-Pin QSOP (QS)
Pin Description
Pin Number
MIC2086
1
Pin Number
MIC2085
1
2
2
3
3
Pin Name
CRWBR
CFILTER
CPOR
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.
M0235-121903
2
January 2004
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