AAT4610AIJS-T1 datasheet(9/11 Pages) AAT

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AAT4610A

Current Limited Load Switch

4610A.2006.9.1.3

ILIM RSET product found in the chart "RSET

Coefficient vs. ILIM." The maximum current is

derived by multiplying the typical current for the

chosen RSET in the chart by 1.25. A few standard

resistor values are listed in the table "Current Limit

RSET Values."

Current Limit RSET Values

Example: A USB port requires 0.5A. 0.5A multiplied

by 1.33 is 0.665A. From the chart named "RSET vs.

ILIM," RSET should be less than 11kΩ. 10.5kΩ is a

standard value that is a little less than 11k

Ω but

very close. The chart reads approximately 0.700A

as a typical ILIM value for 10.5kΩ. Multiplying

0.700A by 0.75 and 1.25 shows that the AAT4610A

will limit the load current to greater than 0.525A but

less than 0.875A.

Operation in Current Limit

When a heavy load is applied to the output of the

AAT4610A, the load current is limited to the value of

ILIM determined by RSET. See Figure 2, "Overload

Operation." Since the load is demanding more cur-

rent than ILIM, the voltage at the output drops. This

causes the AAT4610A to dissipate a larger than nor-

mal quantity of power, and its die temperature to

increase. When the die temperature exceeds an

over-temperature limit, the AAT4610A will shut down

until is has cooled sufficiently, at which point it will

startup again. The AAT4610A will continue to cycle on

and off until the load is removed, power is removed,

or until a logic high level is applied to ON.

Enable Input

In many systems, power planes are controlled by

integrated circuits which run at lower voltages than

the power plane itself. The enable input ON of the

AAT4610A has low and high threshold voltages

that accommodate this condition. The threshold

voltages are compatible with 5V TTL and 2.5V to

5V CMOS.

Reverse Voltage

The AAT4610A is designed to control current flowing

from IN to OUT. If a voltage is applied to OUT which

is greater than the voltage on IN, large currents may

flow. This could cause damage to the AAT4610A.

Current Device Will Device Always

Limit

Not Current Current Limits

RSET

Typ

Limit Below

Below

Ω)

(mA)

40.2

200

150

250

30.9

250

188

313

24.9

300

225

375

22.1

350

263

438

19.6

400

300

500

17.8

450

338

563

16.2

500

375

625

14.7

550

413

688

13.0

600

450

750

10.5

700

525

875

8.87

800

600

1000

7.50

900

675

1125

6.81

1000

750

1250

6.04

1100

825

1375

5.49

1200

900

1500

4.99

1300

975

1625

4.64

1400

1050

1750

Figure 2: Overload Operation.

-0.05

0.05

0.1

0.15

0.2

0.25

0.3

0.25

0.5

0.75

Output Current

Output Voltage

Ω load is turned on at time = 0

AAT4610AIJS-T1 Datasheet(PDF) 9 Page - Advanced Analog Technology, Inc.

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