MIC2546/2547
Dual Programable Current Limit Switch
General Description
Features
The MIC2546 and MIC2547 are integrated high-side dual
•
2.7V to 5.5V input
power switches optimized for low loss dc power switching
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Adjustable current-limit up to 1.5A
and other power management applications, including
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Reverse current flow blocking (no “body diode”)
Advanced Configuration and Power Interface (ACPI). The
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100μA typical on-state supply current per channel
MIC2546/47 is a cost-effective, highly integrated solution
•
2μA typical off-state supply current
that requires few external components to satisfy USB and
ACPI requirements.
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120mΩ maximum on-resistance
Load current management features include a precision
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Open-drain fault flag
resistor-programmable output current-limit and a soft-start
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Thermal shutdown
circuit which minimizes inrush current when the switch is
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Thermal shutdown output latch (MIC2547)
enabled. Thermal shutdown, along with current-limit,
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2ms (slow) turn-on and fast turnoff
protects theswitch and the attached device.
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Available with active-high or active-low enable
The MIC2546/47’s open-drain flag outputs are used to
indicate current-limiting or thermal shutdown to a local
controller. The MIC2547 has an additional internal latch
Applications
which turns the output off upon thermal shutdown
providing robust fault control. The enable signal is
•
USB power distribution
compatible with both 3V and 5V logic, and is also used as
•
PCI Bus Power Switching
the thermal shutdown latch reset for the MIC2547.
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Notebook PC
The MIC2546 and MIC2547 are available in active-high
•
ACPI power distribution
and active-low enable versions in 16-pin TSSOP and SOP
•
PC card hot swap applications
packages.
•
Inrush current-limiting
Data sheets and support documentation can be found on
•
Ideal for dual supply applications
Micrel’s web site at www.micrel.com.
___________________________________________________________________________________________________________
Typical Application
Typical Advanced Configuration and Power Interface (ACPI) Application
UL Recognized Component
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
408
) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
January 2008
M9999-012508-A
MICREL [ MICREL SEMICONDUCTOR ]
