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.
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
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Applications
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Docking stations
Notebook PCs
PDAs
Board hot swap
RAID controllers
USB peripherals
ACPI power distribution
Ordering Information
Part Number
Standard
MIC2040-1BMM
MIC2040-2BMM
MIC2041-1BMM
MIC2041-2BMM
Pb-Free
MIC2040-1YMM
MIC2040-2YMM
MIC2041-1YMM
MIC2041-2YMM
Enable
Active-High
Active-Low
Active-High
Active-Low
X
X
Circuit Breaker
Package
10-Pin MSOP
10-Pin MSOP
10-Pin MSOP
10-Pin MSOP
Typical Application
C2
0.1µF
MIC2040-1BM
6
+3.3V
Power
Supply
IN
C3
4.7µF
C1
0.1µF
R1
20kΩ
VBIAS
VIN
EN
/FAULT
ILIM
GND
4
VOUT
8,10
V
OUT
3.3V@ 1A
C
LOAD
33µF
7, 9
1
Logic
Controller
ON/OFF
2
OVERCURRENT
5
UVLOIN
3
(OPEN)
Note:
BothV
IN
pins (7, 8) must be externally tied together.
BothV
OUT
pins (8, 10) must be externally tied together.
I
LIMIT
= 1A.
R
SET
340Ω
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
January 2005
1
M9999-012004
MICREL [ MICREL SEMICONDUCTOR ]
