MIC2544/2548
Micrel
MIC2544/2548
Programmable Current Limit High-Side Switch
Preliminary Information
General Description
The MIC2544 and MIC2548 are integrated high-side power
switches optimized for low loss dc power switching and other
power management applications, including Advanced Con-
figuration and Power Interface (ACPI). The MIC2544/48 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 resis-
tor-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 MIC2544/48鈥檚 open-drain flag output is used to indicate
current-limiting or thermal shutdown to a local controller. The
MIC2548 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 MIC2548.
The MIC2544 and MIC2548 are available in active-high and
active-low enable versions in the 8-pin SOP (small-outline
package) and 8-pin MSOP (micro-small-outline package).
Features
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2.7V to 5.5V input
Adjustable current-limit up to 1.5A
Reverse current flow blocking (no 鈥渂ody diode鈥?
75碌A(chǔ) typical on-state supply current
1碌A(chǔ) typical off-state supply current
120m鈩?maximum on-resistance
Open-drain fault flag
Thermal shutdown
Thermal shutdown output latch (MIC2548)
2ms (slow) turn-on and fast turnoff
Available with active-high or active-low enable
USB power distribution
PCI Bus Power Switching
Notebook PC
ACPI power distribution
PC card hot swap applications
Inrush current-limiting
Applications
Typical Application
+5V
R
FLG
On/Off
MIC2544-xBM
EN
FLG
GND
ILIM
R
SET
OUT
IN
OUT
NC
0.1碌F
33碌F
Peripheral
SOP pinout shown
Typical Advanced Configuration and Power Interface (ACPI) Application
Micrel, Inc. 鈥?1849 Fortune Drive 鈥?San Jose, CA 95131 鈥?USA 鈥?tel + 1 (408) 944-0800 鈥?fax + 1 (408) 944-0970 鈥?http://www.micrel.com
June 2000
1
MIC2544/2548
MIC2544-1BM PDF文件相關(guān)型號
MIC2548-1BM,MIC2548-1YM,MIC2548-1YMM,MIC2548-2YMM
MIC2544-1BM相關(guān)型號PDF文件下載
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描述
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