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MIC2085

Single Channel Hot Swap Controllers

Micrel 

MIC2085/MIC2086

Single Channel Hot Swap Controllers

General Description

The MIC2085 and MIC2086 are single channel positive

voltage hot swap controllers designed to allow the safe

insertion of boards into live system backplanes. The

MIC2085and MIC2086 are available in 16-pin and 20-pin

QSOP packages, respectively. Using a few external

components and by controlling the gate drive of an

external N-Channel MOSFET device, the MIC2085/86

provide inrush current limiting and output voltage slew rate

control in harsh, critical power supply environments.

Additionally, a circuit breaker function will latch the output

MOSFET off if the current limit threshold is exceeded for a

programmed period of time. The devices’ array of features

provide a simplified yet robust solution for many network

applications in meeting the power supply regulation

requirements and affords protection of critical downstream

devices and components.

Data sheets and support documentation can be found on

Micrel’s web site at www.micrel.com.

Features

• MIC2085: Pin for pin functional equivalent to the

LTC1642

• 2.3V to 16.5V supply voltage operation

• Surge voltage protection to 33V

• Operating temperature range –40°C to 85°C

• Active current regulation limits inrush current

independent of load capacitance

• Programmable inrush current limiting

• Analog foldback current limiting

• Electronic circuit breaker

• Dual-level overcurrent fault sensing

• Fast response to short circuit conditions (< 1µs)

• Programmable output undervoltage detection

• Undervoltage lockout protection

• Power-on reset (MIC2085/86) and power-good

(MIC2086) status outputs

• /FAULT status output

• Driver for SCR crowbar on overvoltage

Applications

• RAID systems

• Cellular base stations

• LAN servers

• WAN servers

• InfiniBand™ Systems

• Industrial high side switching

Typical Application

InfiniBand is a trademark of InfiniBand Trade Association

PowerPAK is a trademark of Vishay Intertechnology, 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

May 2006

M9999-050406

(408) 955-1690

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