icrel, Inc.
MIC2586/MIC2586R
ecember 2012
3
M9999-122012
Ordering Information
Part Number
PWRGD Polarity
Circuit Breaker Function
Package
Standard
Pb-Free
MIC2586-1BM
MIC2586-1YM
Active-HIGH
Latched
14-Pin SOIC
MIC2586-2BM
MIC2586-2YM
Active-LOW
Latched
14-Pin SOIC
MIC2586R-1BM MIC2586R-1YM
Active-HIGH
Auto-Retry
14-Pin SOIC
MIC2586R-2BM MIC2586R-2YM
Active-LOW
Auto-Retry
14-Pin SOIC
Pin Configuration
14-Pin SOIC (M)
MIC2586-1BM
MI 2
R-1BM
14-Pin SOIC (M)
MIC2586-1BM
MI 2
R-1BM
Pin Description
Pin Number
Pin Name
Pin Function
1, 8, 12
NC
Reserved: Make no external connections to these pins.
2
ON
Enable Input: When the voltage at the ON pin is higher than the V
ONH
threshold, a start cycle is
initiated. An internal current source (I
GATEON
) is activated which charges the GATE pin, ramping
up the voltage at this pin to turn on an external MOSFET. Whenever the voltage at the ON pin is
lower than the V
ONL
threshold, an undervoltage lockout condition is detected and the I
GATEON
current source is disabled while the GATE pin is pulled low by another internal current source
(I
GATEOFF
). After a load current fault, toggling the ON pin LOW will reset the circuit breaker then
back HIGH (ON pin) will initiate another start cycle.
3
FB
Output Voltage Feedback Input: This pin is connected to an external resistor divider that is used
to sample the output load voltage. The voltage at this pin is measured against an internal
comparator whose output controls the PWRGD (or /PWRGD) signal. PWRGD (or /PWRGD)
asserts when the FB pin voltage crosses the V
FBH
threshold. When the FB pin voltage is lower
than its V
FBL
threshold, PWRGD (or /PWRGD) is deasserted. The FB comparator exhibits a
typical hysteresis of 80mV.
The FB pin voltage also affects the MIC2586/MIC2586Rs foldback current limit operation (see the
Functional Description section for further information).