MIC2546 Datasheet, PDF (1/12 Pages) Micrel Semiconductor – Dual Programmable Current Limit Switch Preliminary Information

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
• 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
Typical Application
+5V
R_FLGA
R_SETA
R_FLGB
+3.3V
On/Off
On/Off
MIC2546-xBM
ENA OUTA
FLGA INA
GNDA ^OUTA
ILIMA NC
ENB OUTB
FLGB INB
GNDB OUTB
ILIMB
NC
R_SETB
0.1µF
Peripheral
33µF
Peripheral
33µF
0.1µF
Typical Advanced Configuration and Power Interface (ACPI) Application
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com
June 2000
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MIC2546/2547