AAT4610AIJS-1-T1 AAT [Advanced Analog Technology, Inc.], AAT4610AIJS-1-T1 Datasheet - Page 9

• Manufacturer Part Number: AAT4610AIJS-1-T1
• Description: Current Limited Load Switch
• Manufacturer: AAT [Advanced Analog Technology, Inc.]

I
Coefficient vs. I
derived by multiplying the typical current for the
chosen R
resistor values are listed in the table "Current Limit
R
Example: A USB port requires 0.5A. 0.5A multiplied
by 1.33 is 0.665A. From the chart named "R
I
standard value that is a little less than 11kΩ but
4610A.2006.9.1.3
LIM
LIM
SET
R
(kΩ Ω )
40.2
30.9
24.9
22.1
19.6
17.8
16.2
14.7
13.0
10.5
8.87
7.50
6.81
6.04
5.49
4.99
4.64
," R
SET
R
Values."
SET
SET
Current Limit R
Current Device Will Device Always
SET
Limit
(mA)
1000
1100
1200
1300
1400
Typ
200
250
300
350
400
450
500
550
600
700
800
900
should be less than 11kΩ. 10.5kΩ is a
product found in the chart "R
in the chart by 1.25. A few standard
LIM
Limit Below
Not Current Current Limits
." The maximum current is
4
3
2
1
0
5
-0.05
(mA)
1050
150
188
225
263
300
338
375
413
450
525
600
675
750
825
900
975
SET
0
Values
1Ω load is turned on at time = 0
Below
Figure 2: Overload Operation.
(mA)
1000
1250
1375
1500
1625
1750
0.05
1125
250
313
375
438
500
563
625
688
750
875
SET
SET
vs.
0.1
0.15
very close. The chart reads approximately 0.700A
as a typical I
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
I
Operation." Since the load is demanding more cur-
rent than I
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.
LIM
determined by R
Output Current
Output Voltage
0.2
Current Limited Load Switch
LIM
, the voltage at the output drops. This
LIM
0.25
value for 10.5kΩ. Multiplying
SET
. See Figure 2, "Overload
0.3
1
0.75
0.5
0.25
0
AAT4610A
9