MIC1344 Datasheet, PDF (1/17 Pages) Micrel Semiconductor – Smart, 3A, Two-Channel, Power ORing Switch

MIC1344
Smart, 3A, Two-Channel, Power
ORing Switch
General Description
The MIC1344 is an advanced two input, one output, hot
swappable, power multiplexer. It has both automatic and
manual input selection (ENA and ENB) and four status
outputs.
In automatic mode, the MIC1344 will automatically connect
the higher of two input voltages (INA or INB), to the output
(OUT). In manual mode, either of the two inputs can be
routed to the output, or both power inputs can be turned off
so that multiple MIC1344’s can be used for more than two
power inputs.
The MIC1344 has four digital open drain status outputs.
The ASEL\ and BSEL\ outputs indicate which input is
selected. The STAOK and STBOK outputs indicate the
general health of the input channels. Specifically, these
outputs will be inactive (high) if the channel has sufficient
input voltage, the channel current is within acceptable
limits, the die temperature is not too hot, and the channel
has no reverse current detected.
The current limit for each input channel of the MIC1344
can be individually set up to 3A, by two external current-
limit set resistors (ILIMA and ILMIB). The current flowing in
each of the channels can be read by measuring the
voltage at these resistors.
Datasheets and support documentation are available on
Micrel’s web site at: www.micrel.com.
Features
• Two input, one output, power ORing switch
• Input voltage operating range: 2.8V to 5.5V
• Automatic and manual input selection modes
• Four digital and two analog status outputs
• Current blocking: output-to-input and input-to-input
• Low on-resistance (70mΩ typical)
• Up to 3A current handling
• Low standby channel current (11µA typical)
• Separate current limiting and readback for each channel
• Available in 12-pin, 2mm × 2mm, QFN (FTQFN)
package
• Thermal-shutdown protection
• −40°C to 125°C junction temperature range
Applications
• Two input to one output power selector
• Multiple inputs to a single output power selector
• Charger input power selector
• Dual battery selector
• Main and backup power selector
• USB power selector
• Portable products
• Supercapacitor ORing
• Backup battery diode ORing
Typical Application
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
April 24, 2015
Revision 1.0