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PDF CMPWR025 Data sheet ( Hoja de datos )
| Número de pieza | CMPWR025 | |
| Descripción | Dual Input SmartOR Power Switch | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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CMPWR025
Dual Input SmartORt Power
Switch
Product Description
The SmartORt CMPWR025 is a dual input power switch that
selects between two different power inputs and delivers it to one
output. The device integrates two very low impedance power switches
and automatically implements an OR function that selects the higher
of the two inputs. Hysteresis is built in (and is user selectable) to
prevent switch chatter.
The CMPWR025 is a much−improved solution over simply ORing
two diodes, due to the greatly reduced losses of the CMPWR025 when
compared to low forward drop Schottky diodes.
The CMPWR025 is designed to operate above the 1 W (375 mA at
3.3 V) sleep mode rating stated in the PCI Rev 2.2 spec. In fact the
CMPWR025 current rating is dependent upon the power dissipation
resulting from the voltage drop across the internal switch elements.
See the Typical DC Characteristics section in this data sheet for
details.
For IAPC (Instantly Available Personal Computer) applications see
ON Semiconductor Application Note “Instantly Available PCI Card
Power Management”.
The CMPWR025 is housed in a 8−lead MSOP package and is
available with RoHS compliant lead−free finishing.
Features
Implements Logical “Input VCC1 OR Input VCC2”
Integrated Low Impedance Switches (0.2 W TYP)
Operating Supply Range from 2.8 V to 5.5 V
Provides Up to 600 mA Output Current
Glitch−Free Output During Supply Switching Transitions
Low Operating Supply Current of 20 mA (TYP)
User−Selectable Hysteresis for Supply Selection
8−Pin MSOP Package
These Devices are Pb−Free and are RoHS Compliant
Applications
PCI Cards for Wake−On−LAN/Wake−On−Ring
Dual Power Systems
Systems with Standby Capabilities
Battery Backup Systems
See also Application Note AP−211
USB Enabled Mobile Electronics such as MP3 Players, PDAs,
Digital Cameras and Wireless Handsets
http://onsemi.com
MSOP 8
R SUFFIX
CASE 846AD
MARKING DIAGRAM
R025
R025 = CMPWR025R
ORDERING INFORMATION
Device
CMPWR025R
Package
MSOP 8
(Pb−Free)
Shipping†
4000/Tape & Reel
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
Semiconductor Components Industries, LLC, 2011
April, 2011 − Rev. 4
1
Publication Order Number:
CMPWR025/D
1 page  
CMPWR025
CMPWR025 TYPICAL DC CHARACTERISTICS
The Switch Resistance vs. Temperature curve shown in
Figure 3 illustrates the switch resistance measured at
600 mA load with VCC equal to 3.3 V and 5 V. The
resistance is shown at a temperatures range of −40C to
70C. When the temperature rises from 25 to 70C, the
switch resistance increases by about 20%.
Figure 3. Switch Resistance vs. VCC
with Temperature
The Supply Current vs. Temperature curve shown in
Figure 4 illustrates the internal supply current with VCC
equal to 3.3 V and 5 V. This current is drawn from the
selected VCC input, and is dissipated through the ground pin
(pin 5). This current is independent of load current.
Figure 4. Supply Current vs. Temperature
The Hysteresis Voltage vs. Temperature curve shown in
Figure 5 illustrates how the hysteresis voltages vary with
temperature. ‘VHYS1’ is the hysteresis value if pin 8 is left
unconnected, ‘VHYS2’ is the hysteresis value if pin 8 is
connected to ground. ‘VCC1sel’ is the voltage below VCC2
at which Vcc1 will be selected (refer to selection threshold
diagrams on page 4). These three voltages are independent
of the VCC operating voltage.
Figure 5. Hysteresis Voltage vs. Temperature
Power Dissipation and Output Current
Considerations
The CMPWR025 is supplied in an MSOP package which
has a maximum power dissipation rating of 0.3 W. It is
important that the heat generated within the part does not
exceed this rating. The heat generated by the load current is
given by:
PDISS + VSW ILOAD
or
PDISS + RSW (ILOAD)2
At a typical load of 375 mA the PDISS is just
0.4 (0.375)2 + 56 mW
A primary consideration is Maximum Junction
Temperature, TJ(max), which can be calculated using the
following formula:
TJ(max) + TA ) qJA PDISS
Where: TA = The Ambient Temperature
qJA = Thermal Resistance = 100 C/W
PDISS = Power Dissipation
In the above example operating at an ambient of 70C,
TJ(max) would be:
TJ(max) + 70° C ) (0.056 W)(100° CńW) + 75.6° C
Maximum power dissipation, including the power from
the other circuitry within the device, suggests a current
rating of approximately:
ǸPDISS * PINT
RSW
+
ILOAD
Ǹ0.3 W
* 100 mW
0.4
+
865 mA
Note that this is beyond the maximum current rating of the
device, which is 750 mA maximum.
http://onsemi.com
5
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| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet CMPWR025.PDF ] | |
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