MIC2546/2547
Micrel
MIC2546/2547
Dual Programmable Current Limit Switch
Preliminary Information
General Description
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 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 MIC2546/47’s open-drain flag outputs are used to indi-
cate 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.
Features
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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
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
Applications
Typical Application
+5V
0.1µF
R
FLGA
MIC2546-xBM
On/Off
ENA
FLGA
GNDA
OUTA
INA
OUTA
NC
OUTB
INB
OUTB
NC
33µF
Peripheral
33µF
Peripheral
R
SETA
ILIMA
On/Off
ENB
FLGB
R
FLGB
GNDB
ILIMB
R
SETB
+3.3V
0.1µF
Typical Advanced Configuration and Power Interface (ACPI) Application
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
June 2000
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MIC2546/2547
MICREL [ MICREL SEMICONDUCTOR ]
