January 2005

1

M9999-012004

MIC2040/2041

Micrel

MIC2040/2041

Single Channel Low Voltage Power Distribution Switch

General Description

The MIC2040 and MIC2041 are high side MOSFET switches

optimized for general purpose power distribution applications

that require circuit protection. The devices switch up to 5.5V

and as low as 0.8V while offering both programmable current

limiting and thermal shutdown to protect the device and the

load. A fault status output is provided in order to detect

overcurrent and thermal shutdown fault conditions. Both

devices employ soft start circuitry to minimize the inrush

current in applications that employ highly capacitive loads.

Additionally, the MIC2040/41 is suited for multi-port USB

applications to satisfy upstream/downstream power require-

ments.

The MIC2041 features a auto-reset circuit breaker mode that

latches the output off upon detecting an overcurrent condition

lasting more than 28ms. The output is reset by removing or

reducing the load.

Data sheets and support documentation can be found on

Micrel’s web site at www.micrel.com.

Typical Application

7, 9

6

1

2

5

8,10

3

340

Ω

Note:

BothV

BothV

I

C3

4.7

µF

Logic

Controller

ON/OFF

OVERCURRENT

IN

4

MIC2040-1BM

VBIAS

VIN

EN

/FAULT

ILIM

VOUT

UVLOIN

GND

+3.3V

Power

Supply

R1

20k

Ω

33

µF

(OPEN)

3.3V@ 1A

C2

0.1

µF

C1

0.1

µF

Features

• 75mΩ max. on-resistance

• 0.8V to 5.5V operating range

• Adjustable current limit

• Up to 1.5A continuous output current

• Short circuit protection with thermal shutdown

• Circuit breaker mode (MIC2041)

• Fault status flag

• Undervoltage lockout

• Output MOSFET reverse current flow block when

disabled

• Very fast reaction to short-circuits

• Low quiescent current

Applications

• Docking stations

• Notebook PCs

• PDAs

• Board hot swap

• RAID controllers

• USB peripherals

• ACPI power distribution

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

Ordering Information

Part Number

Standard

Pb-Free

Enable

Circuit Breaker

Package

MIC2040-1BMM

MIC2040-1YMM

Active-High

10-Pin MSOP

MIC2040-2BMM

MIC2040-2YMM

Active-Low

10-Pin MSOP

MIC2041-1BMM

MIC2041-1YMM

Active-High

X

10-Pin MSOP

MIC2041-2BMM

MIC2041-2YMM

Active-Low

X

10-Pin MSOP