參數(shù)資料
型號(hào)： AAT4608IGV-1-T1
廠商： Advanced Analogic Technologies, Inc.
英文描述： Current Limited Load Switch in SOT-23 Package
中文描述： 電流限制負(fù)荷開(kāi)關(guān)采用SOT - 23封裝
文件頁(yè)數(shù)： 7/10頁(yè)
文件大?。?/td> 312K
代理商： AAT4608IGV-1-T1
AAT4608
Current Limited Load Switch in SOT-23 Package
4608.2001.10.0.9
7
Applications Information
Setting Current Limit
In most applications, the variation in I
LIM
must be
taken into account when determining R
SET.
The I
LIM
variation is due to processing variations from part
to part, as well as variations in the voltages at IN
(pin 5) and OUT (pin 3), plus the operating temper-
ature. See charts "Current Limit vs. Temperature",
and "Output Current vs. V
OUT
". Together these
three factors add up to a ±25% tolerance (see I
LIM
specification in Electrical Characteristics section).
In the figure below, a cold device with a statistical-
ly higher current limit, and a hot device with a sta-
tistically lower current limit, both with R
SET
equal to
10.5k
are shown. While the chart, "R
SET
vs. I
LIM
"
indicates an I
LIM
of 0.7A with an R
SET
of 10.5k
,
this figure shows that the actual current limit will be
at least 0.525A, and no greater than 0.880A.
To determine R
SET,
start with the maximum current
drawn by the load, and multiply it by 1.33. (typi-
cal_I
LIM
= minimum_I
LIM
/ 0.75) This is the typical
current limit value. Next, refer to "R
SET
vs. I
LIM
" and
find the R
SET
that corresponds to the typical current
limit value. Choose the largest resistor available
that is less than or equal to it. For greater precision,
the value of R
SET
may also be calculated using the
I
LIM
R
SET
product found in the chart "R
SET
coeffi-
cient vs. I
LIM
". The maximum current is derived by
multiplying the typical current for the chosen R
SET
in the chart by 1.25. A few standard resistor values
are listed in the table "Current Limit R
SET
Values".
Current Limit R
SET
Values
Example: AUSB port requires 0.5A. 0.5Amultiplied
by 1.33 is 0.665A. From the chart named "R
SET
vs.
I
LIM
", R
SET
should be less than 11k
. 10.5 k
is a
standard value that is a little less than 11k
but
very close. The chart reads approximately 0.700A
as a typical I
LIM
value for 10.5k
. Multiplying
0.700A by 0.75 and 1.25 shows that the AAT4608
will limit the load current to greater than 0.525A but
less than 0.875A.
R
SET
(k
)
Current
Limit typ
(mA)
Device will
not current
limit below:
(mA)
150
188
225
263
300
338
375
413
450
525
600
675
750
825
900
975
1050
Device always
current limits
below:
(mA)
250
313
375
438
500
563
625
688
750
875
1000
1125
1250
1375
1500
1625
1750
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
200
250
300
350
400
450
500
550
600
700
800
900
1000
1100
1200
1300
1400
Current Limit Using10.5 k
0
0.2
0.4
0.6
0.8
1
1.2
0
1
2
3
4
5
V
OUT
(V)
I
L
(
0.88 A
0.525 A
Device with high current limit at -40
°
C
Device with low current limit at 85
°
C
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