MIC2589 Micrel Semiconductor, MIC2589 Datasheet

MIC2589

Manufacturer Part Number

MIC2589

Description

(MIC2589 / MIC2595) SINGLE-CHANNEL NEGATIVE HIGH VOLTAGE HOT SWAP POWER CONTROLLERS/SEQUENCERS

Manufacturer

Micrel Semiconductor

Datasheet

1.MIC2589.pdf (17 pages)

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Price

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Part Number:

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Part Number:

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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

MIC2589/89R and the MIC2595/95R 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 volt-

age slew-rate control. Overcurrent fault protection is also

provided for which the overcurrent threshold and the

overcurrent duration are programmable. Very fast fault re-

sponse is provided to ensure that system power supplies

maintain regulation even during output short circuits. This

family offers two responses to a circuit breaker fault condition:

the MIC2589 and MIC2595 latch the circuit breaker’s output

off if the overcurrent threshold interval is exceeded 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 stag-

gered) Power-Good signals are provided to indicate that the

output voltage of the inrush current limiter 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.

Typical Application

March 2004

MIC2589/2595

(Short Pin)

(Long Pin)

RETURN

Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com

INPUT

–48V

11.8k

12.4k

698k

VDD

VEE

SENSE

GATE

SENSE

MIC2589R-1BM

MIC2589-1BM

GATE

PGTIMER

PWRGD1

PWRGD2

PWRGD3

CFILTER

DRAIN

CNLD

www.DataSheet4U.com

NLD

FILTER

Features

• Provides safe insertion and removal from live

• Operates from –19V to –80V

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

• User-programmable overcurrent detector response time

• Electronic circuit breaker function:

• Active current regulation precisely controls inrush

• Regulated maximum output currents into faults

• Programmable undervoltage and overvoltage lockouts

• Programmable UVLO hysteresis (MIC2595/95R)

• Staggered ‘Power-Good’ outputs provide load

• Fault reporting:

Applications

• Central office switching

• –48V power distribution

• Distributed power systems

Single-Channel, Negative High-Voltage Hot

–48V (nominal) backplanes

conditions

currents

(MIC2589/89R)

sequencing

Output latch OFF (MIC2589/95) or

Output auto-retry (MIC2589R/95R)

Active-HIGH (MIC25XX-1) and Active-LOW

(MIC25XX-2) Power-Good signal output

Swap Power Controllers/Sequencers

Input Overvoltage = 71.2V

Input Undervoltage = 36.5V

(See "Functional Description"ˇ for more detail)

MIC2589/MIC2595

100 F

DC-DC Converter

IN+

/ON/OFF

IN–

IN+

/ON/OFF

IN–

IN+

/ON/OFF

IN–

GND

OUT

M9999-031504

+2.5V

RETURN

+3.3V

RETURN

+5V

RETURN

Micrel

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