MIC2589/MIC2595

Single-Channel, Negative High-Voltage Hot

Swap Power Controller/Sequencer

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

December 2005

M9999-120505

(408) 955-1690

General Description

The MIC2589 and MIC2595 are single-channel,

negative voltage hot swap controllers designed to

address the need for safe insertion and removal of

circuit boards into “live” system backplanes, while using

few external components. The MIC2589/MIC2589R and

the MIC2595/MIC2595R are each available in 14-pin

SOIC packaging and work in conjunction with an

external N-Channel MOSFET for which the gate drive is

controlled to provide inrush current limiting and output

voltage slew-rate control. Overcurrent fault protection is

also provided via a programmable overcurrent threshold

and filter. Very fast fault response is provided to ensure

that system power supplies maintain regulation even

during output short circuits. These controllers offer two

responses to a circuit breaker fault condition: the

MIC2589 and MIC2595 latch the circuit breaker’s output

off when the overcurrent threshold interval is exceeded

and the overcurrent filter times out while the MIC2589R

and MIC2595R automatically attempt to restart at a fixed

duty cycle after a current limit fault. A primary Power-

Good signal and two secondary (delayed and

staggered) Power-Good signals are provided to indicate

that the output voltage is within its valid operating range.

These signals can be used to perform an all-at-once or

a sequenced enabling of one or more DC-DC power

modules.

All support documentation can be found on Micrel’s web

site at www.micrel.com.

Features

• Provides safe insertion and removal from live –48V

(nominal) backplanes

• Operates from –19V to –80V

• Fast responding circuit breaker (<1µs) to short circuit

conditions

• User-programmable overcurrent detector response

time

• Electronic circuit breaker function:

Output latch OFF (MIC2589/MIC2595)

Output auto-retry (MIC2589R/MIC2595R)

• Active current regulation to control inrush currents

• Programmable undervoltage and overvoltage

lockouts (MIC2589/MIC2589R)

• Programmable UVLO hysteresis

(MIC2595/MIC2595R)

• Staggered ‘Power-Good’ output signals provide load

sequencing

Active-HIGH (-1)

Active-LOW (-2)

Applications

• Central office switching

• –48V power distribution

• Distributed power systems

• AdvancedTCA

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Ordering Information

Part Number

Standard

Pb-Free

PWRGD

Polarity

Lockout Functions

Circuit Breaker

Function

Package

MIC2589-1BM

MIC2589-1YM

Active-High

Programmable UVLO & OVLO

Latched Off

14-Pin SOIC

MIC2589-2BM

MIC2589-2YM

Active-Low

Programmable UVLO & OVLO

Latched Off

14-Pin SOIC

MIC2589R-1BM

MIC2589R-1YM

Active-High

Programmable UVLO & OVLO

Auto Retry

14-Pin SOIC

MIC2589R-2BM

MIC2589R-2YM

Active-Low

Programmable UVLO & OVLO

Auto Retry

14-Pin SOIC

MIC2595-1BM

MIC2595-1YM

Active-High

Programmable UVLO Hysteresis

Latched Off

14-Pin SOIC

MIC2595-2BM

MIC2595-2YM

Active-Low

Programmable UVLO Hysteresis

Latched Off

14-Pin SOIC

MIC2595R-1BM

MIC2595R-1YM

Active-High

Programmable UVLO Hysteresis

Auto Retry

14-Pin SOIC

MIC2595R-2BM

MIC2595R-2YM

Active-Low

Programmable UVLO Hysteresis

Auto Retry

14-Pin SOIC