MIC2544A/2548A
Programmable Current Limit
High-Side Switch
General Description
The MIC2544A and MIC2548A are integrated, high-side
power switches optimized for low loss DC power switching
and other power management applications, including
Advanced Configuration and Power Interface (ACPI).
The MIC2544A/48A 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 the switch and the attached device.
The MIC2544A/48A’s open-drain flag output is used to
indicate current-limiting or thermal shutdown to a local
controller. The MIC2548A 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 MIC2548A
The MIC2544A and MIC2548A are available in active-high
and active-low enable versions in the 8-pin SOIC
(small-outline integrated circuit) and 8-pin MSOP (micro-
small-outline package).
Features
•
•
•
•
•
•
•
•
•
•
•
2.7V to 5.5V input
Adjustable current-limit up to 1.5A
Reverse current flow blocking (no “body diode”)
90µA typical on-state supply current
1μA typical off-state supply current
120mΩ maximum on-resistance
Open-drain fault flag
Thermal shutdown
Thermal shutdown output latch (MIC2548A)
2ms (slow) turn-on and fast turn-off
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
_________________________________________________________________________________________________________
Typical Application
Typical Advanced Configuration and Power Interface (ACPI) Application
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
408
) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
April 2010
M9999-043010
MICREL [ MICREL SEMICONDUCTOR ]
