MIC2546_08 Datasheet, PDF (1/15 Pages) Micrel Semiconductor – Dual Programable Current Limit Switch

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