MIC2587(2013) Ver la hoja de datos (PDF) - Micrel
Número de pieza
componentes Descripción
Fabricante
MIC2587 Datasheet PDF : 22 Pages
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Micrel, Inc.
Ordering Information
Part Number
MIC2587-1YM
MIC2587-2YM
MIC2587R-1YM
MIC2587R-2YM
PWRGD Polarity
Active-HIGH
Active-LOW
Active- HIGH
Active-LOW
Pin Configuration
Circuit Breaker Function
Latched
Latched
Auto-retry
Auto-retry
MIC2587/MIC2587R
Package
8-Pin SOIC
8-Pin SOIC
8-Pin SOIC
8-Pin SOIC
Finish
Pb-Free
Pb-Free
Pb-Free
Pb-Free
8-pin SOIC (M)
MIC2587-1YM
MIC2587R-1YM
(Top View)
8-pin SOIC (M)
MIC2587-2YM
MIC2587R-2YM
(Top View)
Pin Description
Pin Number
Pin Name
1
ON
2
FB
Pin Function
Enable Input: When the voltage at the ON pin is higher than the VONH threshold, a start cycle is
initiated. An internal current source (IGATEON) 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 VONL threshold, an undervoltage lockout condition is detected and the IGATEON
current source is disabled while the GATE pin is pulled low by IGATEOFF. After a load current fault,
toggling the ON pin LOW then back HIGH will reset the circuit breaker and initiate another start
cycle.
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 VFBH threshold. When the FB pin voltage is lower
than its VFBL threshold, PWRGD (or /PWRGD) is de-asserted. The FB comparator exhibits a
typical hysteresis of 80mV.
The FB pin voltage also affects the MIC2587/MIC2587R’s foldback current limit operation (see
the “Functional Description” section for further information).
January 24, 2013
3
Revision 2.0
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