MIC2027/2077

Quad USB Power Distribution Switch

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

September 2006

1

M9999-091506

General Description

The MIC2027 and MIC2077 are quad high-side MOSFET

switches optimized for general-purpose power distribution

requiring circuit protection. The MIC2027/77 are internally

current limited and have thermal shutdown that protects

the device and load.

The MIC2077 offers “smart” thermal shutdown that

reduces current consumption in fault modes. When a

thermal shutdown fault occurs, the output is latched off

until the faulty load is removed. Removing the load or

toggling the enable input will reset the device output.

Both devices employ soft-start circuitry that minimizes

inrush current in applications where highly capacitive loads

are employed.

A fault status output flag is asserted during overcurrent

and thermal shutdown conditions. Transient current limit

faults are internally filtered.

The MIC2027/77 are available in 16-pin narrow (150 mil)

and wide (300 mil) SOIC packages.

Data sheets and support documentation can be found on

Micrel’s web site at www.micrel.com.

Features

• 150mΩ maximum on-resistance per channel

• 2.7V to 5.5V operating range

• 500mA minimum continuous current per channel

• Short-circuit protection with thermal shutdown

• Thermally isolated channels

• Fault status flag with 3ms filter eliminates false

assertions

• Undervoltage lockout

• Reverse current flow blocking (no “body diode”)

• Circuit breaker mode (MIC2077) reduces power

consumption

• Logic-compatible inputs

• Soft-start circuit

• Low quiescent current

• Pin compatible with MIC2524 and MIC2527

Applications

• USB peripherals

• General purpose power switching

• ACPI power distribution

• Notebook PCs

• PDAs

• PC card hot swap

Typical Application

®

UL Recognized Component

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