CMPWR025 datasheet(5/8 Pages) ONSEMI

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CMPWR025

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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 −40C to

70C. When the temperature rises from 25 to 70C, 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

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 70C,

TJ(max) would be:

TJ(max) + 70° C ) (0.056 W)(100° C W) + 75.6° C

Maximum power dissipation, including the power from

the other circuitry within the device, suggests a current

rating of approximately:

PDISS * PINT

RSW

+ ILOAD

0.3 W * 100 mW

0.4

+ 865 mA

Note that this is beyond the maximum current rating of the

device, which is 750 mA maximum.

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