MIC2587 datasheet(3/22 Pages) MICREL

3 / 22 page

Micrel, Inc.

MIC2587/MIC2587R

January 24, 2013

Revision 2.0

Ordering Information

Part Number

PWRGD Polarity

Circuit Breaker Function

Package

Finish

MIC2587-1YM

Active-HIGH

Latched

8-Pin SOIC

Pb-Free

MIC2587-2YM

Active-LOW

Latched

8-Pin SOIC

Pb-Free

MIC2587R-1YM

Active- HIGH

Auto-retry

8-Pin SOIC

Pb-Free

MIC2587R-2YM

Active-LOW

Auto-retry

8-Pin SOIC

Pb-Free

Pin Configuration

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

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).

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