MIC2073/2074

Dual-Channel Power Distribution Switch

General Description

The MIC2073/2074 are high-side MOSFET switches

optimized for general-purpose power distribution requiring

circuit protection.

The MIC2073/2074 are internally current limited and have

thermal shutdown for protecting the device and load.

The MIC2074 offers “smart” shutdown that reduces current

consumption in fault mode. When a fault occurs due to

thermal shutdown, the output is latched off.

The

MIC2074s’ output will be reset, enabling the output, either

by removing the load or toggling the ENABLE pin.

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 or

thermal shutdown conditions. Transient faults are internally

filtered.

The MIC2073/2074 are available in an 8-pin SOIC.

All support documentation can be found on Micrel’s web

site at: www.micrel.com.

Features

• 115 mΩ typical R

B

• 210 mΩ maximum R

B

• 2.7 V to 5.5 V operating range

• 500 mA minimum continuous current per channel

• Short circuit protection with thermal shutdown

• Thermally isolated channels

• Fault status flag (FLGA/B) separate for each channel

• UVLO (Undervoltage Lockout)

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

• Circuit breaker mode (MIC2074)

• Logic-compatible inputs

• Soft-start circuit

• Low quiescent current

• Pin compatible with the MIC2026/2076

Applications

• USB peripherals

• General purpose power switching

• ACPI power distribution

• Notebook PCs

• PDAs

• PC card hot swap

_________________________________________________________________________________________________

Typical Application

ENA

OUTA

FLGA

IN

FLGB

GND

ENB

OUTB

ON/OFF

OVERCURRENT

OVERCURRENT

ON/OFF

MIC2073/74

Logic Controller

2.7V to 5.5V

0.1µF

VIN

Load

Load

10k

10k

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (

January 2009

M9999-011209