MIC2587/MIC2587R

Single-Channel, Positive High-Voltage

Hot Swap Controller

Power, Connect, and Protect is a trademark of Micrel Inc.

Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax +1 (408) 474-1000 • http://www.micrel.com

October 2004

M9999-102204

(408) 955-1690

General Description

The MIC2587 and MIC2587R are single-channel positive

voltage hot swap controllers designed to provide safe

insertion and removal of boards for systems that require

live (always-powered) backplanes. These devices use few

external components and act as controllers for external N-

channel power MOSFET devices to provide inrush current

control and output voltage slew rate control. Overcurrent

fault protection is provided via programmable analog

foldback

current

limit

circuitry

equipped

with

a

programmable overcurrent filter.

These protection circuits

combine to limit the power dissipation of the external

MOSFET to insure that the MOSFET is in its SOA during

fault conditions. The MIC2587 provides a circuit breaker

function that latches the output MOSFET off if the load

current exceeds the current limit threshold for the duration

of the programmable timer.

The MIC2587R provides a

circuit breaker function that automatically attempts to

restart power after a load current fault at a low duty cycle to

prevent the MOSFET from overheating.

Each device

provides either an active-HIGH (-1BM) or an active-LOW

(-2BM) “Power-is-Good” signal to indicate that the output

load voltage is within tolerance.

Data sheets and support documentation can be found on

Micrel’s web site at www.micrel.com.

Features

• MIC2587: Pin-for-pin functional equivalent to the LT1641

• Operates from +10V to +80V with 100V ABS MAX operation

• Industrial temperature specifications at V

• Programmable current limit with analog foldback

• Active current regulation minimizes inrush current

• Electronic circuit breaker for overcurrent fault protection

-

Output latch off (MIC2587) or

-

Output auto-retry (MIC2587R)

• Fast responding circuit breaker (< 2µs) to short circuit loads

• Programmable input undervoltage lockout

• Fault Reporting:

Open-drain “Power-is-Good” output for enabling DC/DC

converter(s)

-

Active-HIGH:

MIC2587-1/MIC2587R-1

-

Active-LOW:

MIC2587-2/MIC2587R-2

Applications

• General-purpose hot board insertion

• High-voltage, high-side electronic circuit breaker

• +12V/+24V/+48V Distributed Power Systems

• +24V/+48V Industrial/Alarm Systems

• Telecom Systems

• Medical Systems

Ordering Information

Part Number

Standard

Pb-Free

PWRGD Polarity

Circuit Breaker Function

Package

MIC2587-1BM

MIC2587-1YM

Active-HIGH

Latched

8 pin SOIC

MIC2587-2BM

MIC2587-2YM

Active-LOW

Latched

8 pin SOIC

MIC2587R-1BM

MIC2587R-1YM

Active- HIGH

Auto-retry

8 pin SOIC

MIC2587R-2BM

MIC2587R-2YM

Active-LOW

Auto-retry

8 pin SOIC