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AAT4608IGV-1-T1 데이터시트 PDF




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부품번호 AAT4608IGV-1-T1 기능
기능 Current Limited Load Switch in SOT-23 Package
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AAT4608IGV-1-T1 데이터시트, 핀배열, 회로
AAT4608
Current Limited Load Switch in SOT-23 Package
General Description
The AAT4608 SmartSwitch™ is a member of
AnalogicTech's Application Specific Power
MOSFET™ (ASPM™) product family. It is a Current
Limited P-channel MOSFET power switch designed
for high-side load-switching applications. This switch
operates with inputs ranging from 2.7V to 5.5V, mak-
ing it ideal for both 3V and 5V systems. An inte-
grated current-limiting circuit protects the input sup-
ply against large currents which may cause the sup-
ply to fall out of regulation. The AAT4608 is also pro-
tected from thermal overload which limits power dis-
sipation and junction temperatures. It can be used
to control loads that require up to 1 A. Current limit
threshold is programmed with a resistor from SET to
ground. The quiescent supply current is typically a
low 15µA max.
The AAT4608 is available in a 5 pin SOT-23 spec-
ified over -40 to 85°C.
Features
SmartSwitch
• 2.7V to 5.5V Input voltage range
• Programmable over current threshold
• Fast transient response:
• <1µs response to short circuit
• Low quiescent current
• 15µA typical
• 1µA max with Switch off
• 160mtypical RDS(ON)
• Undervoltage Lockout
• Thermal shutdown
• Temp range -40 to 85°C
• 4kV ESD Rating
• 5 pin SOT-23 package
Applications
• Peripheral ports
• Notebook computers
• Personal communication devices
• Hot swap supplies
Typical Application
INPUT
1µF
GND
4608.2001.10.0.9
5
IN
AAT4608 OUT 1
SOT-23
3
SET
GND
2
RSET
OUTPUT
0.47µF
GND
1




AAT4608IGV-1-T1 pdf, 반도체, 판매, 대치품
AAT4608
Current Limited Load Switch in SOT-23 Package
Typical Characteristics
(Unless otherwise noted, VIN = 5V, TA = 25°C)
Quiescent Current vs. Temperature
25
20
15
10
5
0
-40
-20
0 20 40 60 80
Temperature (C)
100 120
Quiescent Current
40
30
20
10
0
2.5 3 3.5 4 4.5 5 5.5
Input ( V )
Output Current vs VOUT
0.6
0.4
RSET =16 k
0.2
0
0 12 34
Vout ( V )
5
Short Circuit through 0.3
8 12
6
Input Voltage
8
4 Output Current 4
20
Output Voltage
0 -4
0123
Time (µs)
4
RDS(ON) vs. Temperature
250
Input = 3 V
200
150 Input = 5 V
100
50
0
-40
-20
0 20 40 60
Temperature (C)
80
100
Short Circuit through 0.6
89
6 Input Voltage 6
4 Output Current 3
20
Output Voltage
0 -3
0123
Time (µs)
4608.2001.10.0.9

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AAT4608IGV-1-T1 전자부품, 판매, 대치품
AAT4608
Current Limited Load Switch in SOT-23 Package
Applications Information
Setting Current Limit
In most applications, the variation in ILIM must be
taken into account when determining RSET. The ILIM
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. VOUT". Together these
three factors add up to a ±25% tolerance (see ILIM
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 RSET equal to
10.5kare shown. While the chart, "RSET vs. ILIM"
indicates an ILIM of 0.7A with an RSET of 10.5k,
this figure shows that the actual current limit will be
at least 0.525A, and no greater than 0.880A.
Current Limit Using 10.5 k
1.2
1 0.88 A
Device with high current limit at -40°C
0.8
0.6
0.4 0.525 A
0.2
Device with low current limit at 85°C
0
0 12 3 4 5
VOUT ( V )
To determine RSET, start with the maximum current
drawn by the load, and multiply it by 1.33. (typi-
cal_ILIM = minimum_ILIM / 0.75) This is the typical
current limit value. Next, refer to "RSET vs. ILIM" and
find the RSET 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 RSET may also be calculated using the
ILIM RSET product found in the chart "RSET coeffi-
cient 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
RSET
(k)
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
Current
Limit typ
(mA)
200
250
300
350
400
450
500
550
600
700
800
900
1000
1100
1200
1300
1400
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
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 11k. 10.5 kis a
standard value that is a little less than 11kbut
very close. The chart reads approximately 0.700A
as a typical ILIM 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.
4608.2001.10.0.9
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AAT4608IGV-1-T1

Current Limited Load Switch in SOT-23 Package

Advanced Analogic Technologies
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