CMPWR025 datasheet(5/7 Pages) CALMIRCO

Part #	CMPWR025

Description	Dual Input SmartOR Power Switch

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Manufacturer	CALMIRCO [California Micro Devices Corp]

Direct Link	http://www.calmicro.com

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5 / 7 page

10/18/2000

5

CMPWR025

CALIFORNIA MICRO DEVICES

215 Topaz Street, Milpitas, California 95035

Tel: (408) 263-3214

Fax: (408) 263-7846

www.calmicro.com

TYPICAL DC CHARACTERISTICS

Switch Resistance vs. V

CC with Temperature in Figure

1 shows the switch resistance measured at 500mA load,

over a wide V

CC voltage range. The resistance is shown

at ambient temperatures of 0°C, 25°C, and 70°C. When

the temperature rises from 25°C to 70°C, the switch

resistance increases by about 20%.

0.40

0.35

0.30

0.25

0.20

0.15

0.10

2.5

3.5

4.0

4.5

VCC (V)

5.0

5.5

6.0

3.0

70˚C

25˚C

0˚C

Figure 1.

Switch Resistance vs. V

CC with Temperature

Supply Current vs. V

CC with Temperature in Figure 2

shows how the small internal supply current varies with

V

CC voltage and temperature. This current will be drawn

from the selected V

CC input, and will be dissipated

through ground pin 5. This current is independent of

load current.

40

35

30

25

20

15

10

2.5

3.5

4.0

4.5

VCC (V)

5.0

5.5

6.0

3.0

70˚C

25˚C

0˚C

Figure 2. Supply Current vs. V

CC

with Temperature (No Load)

150

175

200

125

100

75

50

25

0

2.5

4.5

Temperature (˚C)

5.5

6.5

7.5

3.0

VCC1SEL

VHYS1

VHYS2

Figure 3. Hysteresis Voltage vs.Temperature

POWER DISSIPATION

AND OUTPUT CURRENT CONSIDERATION

The CMPWR025 is supplied in standard SOIC or MSOP

packages, which have a maximum power dissipation

rating of 0.3W. 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:

P

DISS = VSW X ILOAD

or

P

DISS = RSW X (ILOAD)

2

At a typical load of 375mA the P

DISS is just 0.4 x (0.375)

2

= 56mW.

A primary consideration is Maximum Junction Tempera-

ture, T

J(max), which can be calculated using the following

formula:

T

J(max) = TA + θJA X

P

DISS

Where: T

A = The Ambient Temperature

θ

JA = Thermal Resistance = 100 °C/W

P

DISS = Power Dissipation

In the above example operating at an ambient of 70°C,

T

j(max) would be:

T

J(max) = 70°C + (0.056W)(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

0.3W – 100µW

0.4

= 865mA

Note that this is beyond the maximum current rating of

the device, which is to 750mA maximum.

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