MIC2040/2041
Micrel
MIC2040/2041
Single Channel Low Voltage Power Distribution Switch
General Description
Features
The MIC2040 and MIC2041 are high side MOSFET switches
optimizedforgeneralpurposepowerdistributionapplications
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.
• 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
The MIC2041 features a auto-reset circuit breaker mode that
latchestheoutputoffupondetectinganovercurrentcondition
lasting more than 28ms. The output is reset by removing or
reducing the load.
Applications
• Docking stations
• Notebook PCs
• PDAs
• Board hot swap
• RAID controllers
• USB peripherals
• ACPI power distribution
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
Ordering Information
Part Number
Standard
Pb-Free
Enable
Circuit Breaker
Package
MIC2040-1BMM
MIC2040-2BMM
MIC2041-1BMM
MIC2041-2BMM
MIC2040-1YMM
MIC2040-2YMM
MIC2041-1YMM
MIC2041-2YMM
Active-High
Active-Low
Active-High
Active-Low
10-Pin MSOP
10-Pin MSOP
10-Pin MSOP
10-Pin MSOP
X
X
Typical Application
C2
0.1µF
MIC2040-1BM
VOUT
3.3V@ 1A
6
8,10
VBIAS
VIN
VOUT
+3.3V
Power
Supply
C3
4.7µF
CLOAD
33µF
7, 9
1
C1
0.1µF
R1
20kΩ
LogicON/OFF
INController
EN
2
5
3
/FAULT UVLOIN
(OPEN)
OVERCURRENT
ILIM
RSET
340Ω
GND
4
Note:
BothVIN pins (7, 8) must be externally tied together.
BothVOUT pins (8, 10) must be externally tied together.
ILIMIT = 1A.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
M9999-012004
January 2005
1