概述
数据手册AAT4601IAS-B1 概述
1.5A Current Limited P-Channel Switch 1.5A限流P沟道开关
AAT4601IAS-B1 数据手册
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PDF下载AAT4601
1.5A Current Limited P-Channel Switch
™
SmartSwitch
General Description
Features
The AAT4601 SmartSwitch™ is part of
AnalogicTech's Application Specific Power
MOSFET™ (ASPM™) product family. It is a 1.5A
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, making it ideal for both 3V and 5V sys-
tems. An integrated current-limiting circuit protects
the input supply against large changes in load cur-
rent which could cause the supply to fall out of reg-
ulation. The AAT4601 has protection from thermal
overload which limits power dissipation and junc-
tion temperatures. The maximum current limit
level is 1.5A; the actual threshold is programmed
with a resistor from the SET pin to ground. The qui-
escent supply current is typically 12µA. In shut-
down mode, the supply current decreases to less
than 1µA.
•
•
•
2.7V to 5.5V Input voltage range
Programmable over current threshold
Low quiescent current
•
•
12µA typical
Less than 1µA with Switch off
•
•
•
•
•
•
•
•
•
Only 2.5V needed for ON Control
Thermal Shutdown
Fault Flag
2ms Fault Blanking
Undervoltage Lockout
Temperature range -40 to 85°C
2kV ESD rating
UL Approved—File No. E217765
8-pin SOP or TSSOP package
Applications
The AAT4601 is available in 8-pin SOP or TSSOP
specified over -40 to 85°C.
•
•
•
•
USB ports
Notebook computers
Peripheral ports
Hot swap supplies
UL Recognized Component
Typical Application
INPUT
OUTPUT
1
6
IN
OUT
2
7
IN
OUT
AAT4601
100kΩ
8
3
FAULT
ON
5
SET
ON
RSET
GND
4
1µF
1uF
4601.2001.11.0.92
1
AAT4601
1.5A Current Limited P-Channel Switch
Pin Descriptions
Pin #
Symbol
Function
1,2
IN
These pins are the input to the P-channel MOSFET source. Connect a
1µF capacitor from IN to GND.
3
4
5
ON
GND
SET
Active-Low Enable Input. A logic low turns the switch on.
Ground
Current-Limit Set Input. A resistor from SET to ground sets the current
limit for the switch.
6,7
8
OUT
These pins are the P-channel MOSFET drain connection. Connect a 1µF
capacitor from OUT to GND.
FAULT
Fault-Indication Output. This open-drain output goes low when in current
limit or when the die temperature exceeds +135 ºC, with a 2ms delay
after the fault event occurs.
Pin Configuration
SOP-8/TSSOP-8
(Top View)
1
8
FAULT
OUT
OUT
IN
IN
ON
2
3
4
7
6
5
GND
SET
2
4601.2001.11.0.92
AAT4601
1.5A Current Limited P-Channel Switch
Absolute Maximum Ratings (TA=25°C unless otherwise noted)
Symbol
Description
Value
Units
VIN
VON, VFAULT
VSET, VOUT
IMAX
IN to GND
-0.3 to 6
-0.3 to VIN+0.3
-0.3 to VIN+0.3
3
V
V
ON, FAULT to GND
SET, OUT to GND
V
Maximum Continuous Switch Current
Operating Junction Temperature Range
Maximum Soldering Temperature (at Leads)
ESD Rating—HBM1
A
TJ
-40 to 150
300
°C
°C
V
TLEAD
VESD
4000
Note: Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at con-
ditions other than the operating conditions specified is not implied. Only one Absolute Maximum rating should be applied at any one time.
Note 1: Human body model is a 100pF capacitor discharged through a 1.5kΩ resistor into each pin.
Thermal Characteristics
Symbol
Description
Typical Thermal Resistance2
Maximum Power Dissipation2
Value
Units
ΘJA
PD
100
°C/W
W
1.25
Note 2: Mounted on an AATI demo board.
Electrical Characteristics (VIN = 5V, TA = -40 to 85°C unless otherwise noted. Typical values
are at TA=25°C)
Symbol
Description
Conditions
Min
Typ
Max Units
VIN
IQ
IQ(OFF)
ISD(OFF)
VUVLO
Operation Voltage
Quiescent Current
Off Supply Current
Off Switch Current
Undervoltage Lockout
2.7
5.5
30
1
15
2.7
V
µA
µA
µA
V
mΩ
mΩ
mΩ
mA
mA
ºC
V
VIN = 5V, ON = GND, IOUT = 0
ON=IN, VIN = 5.5V
ON = IN, VIN = 5.5V, VOUT = 0
Rising edge, 1% hysteresis,
VIN=5.0V
VIN=4.5V
VIN=3.0V
RSET = 2kΩ
12
.004
.07
2.3
70
75
80
715
250
125
2.0
RDS(ON)
On-Resistance
130
150
920
ILIM
ILIM(MIN)
TSD
Current Limit
510
Minimum Current Limit
Shutdown Temperature
ON Input Low Voltage
VIN = 5V
VONL
0.8
VIN=2.7V to 3.6V
VIN=4.5V to 5.5V
VON = 5.5V
ISINK=1mA
VFAULT = 5.5V
VIN=5V
2.0
2.4
V
V
µA
V
µA
µs
ms
µs
µs
ºC
VONH
ON Input High Voltage
IONSINK
VFAULTL
IFSINK
TRESP
TBLANK
TOFF
ON Input leakage
0.01
0.08
0.05
2
1
0.4
1
FAULT Logic Output Low Voltage
FAULT Logic Output High Leakage
Current Limit Response Time
Fault Blanking Time after Turn-On
Turn-Off Time3
Turn-On Time3
Over Temperature Shut Down
2
VIN=5V
VIN=5V
20
200
TON
OTMP
125
Note 3: Guaranteed by design.
4601.2001.11.0.92
3
AAT4601
1.5A Current Limited P-Channel Switch
Typical Characteristics
(Unless otherwise noted, VIN = 5V, TA = 25°C)
Quiescent Current vs. Temperature
Quiescent Current
25
20
15
10
5
25
20
15
10
5
0
-40
-20
0
20
40
60
80
100
120
0
0
1
2
3
4
5
6
Temperature (°C)
Input (V)
Current Limit
RSET ILIM Product vs ILIM
1
2500
2000
1500
1000
500
0.8
0.6
0.4
0.2
0
RSET = 2 k
Input Voltage = 5 V
0
0.5
1
1.5
2
0
1
2
3
4
5
Typical ILIM (A)
Output (V)
Off-Supply Current vs. Temperature
Off-Switch Current vs. Temperature
10
1
10
1
0.1
0.01
0.1
0.01
0.001
0.001
0.0001
-40
-20
0
20
40
60
80
100
120
140
0.0001
-40
-20
0
20
40
60
80
100 120
140
Temperature (°C)
Temperature (°C)
4
4601.2001.11.0.92
AAT4601
1.5A Current Limited P-Channel Switch
Typical Characteristics
(Unless otherwise noted, VIN = 5V, TA = 25°C)
Turn-On vs. Temperature
Turn-Off vs. Temperature
80
2
1.8
70
VIN=3V
VIN=3V
1.6
60
50
1.4
VIN=5V
1.2
VIN=5V
40
1
0.8
0.6
0.4
0.2
0
30
20
10
0
-40
-20
0
20
40
60
80
100
120
-40
-20
0
20
40
60
80
100
120
Temperature (°C)
Temperature (°C)
Switch Turn-Off Time
Switch Turn-On Time
6
5
6
5
IOUT =ILIMIT
4
4
IOUT = ILIMIT
ON
ON
3
3
2
2
Output
Output
1
1
0
0
-1
-1
-4
-2
0
2
4
6
-20
-10
0
40
60
80
Time (
Time (
Short Circuit through 0.3Ω
Short Circuit through 0.6Ω
8
6
4
2
0
12
8
6
4
2
0
9
6
3
0
Output Current
Output Current
Input Voltage
8
Input Voltage
4
0
Output Voltage
Output Voltage
-4
-3
0
2
4
6
8
-20
0
20
40
60
80
100
120
140
Time (µs)
Time (µs)
4601.2001.11.0.92
5
AAT4601
1.5A Current Limited P-Channel Switch
Typical Characteristics
(Unless otherwise noted, VIN = 5V, TA = 25°C)
Fault Delay vs. Temperature
RDS(ON) vs. Temperature
2.5
2.0
1.5
1.0
0.5
0
100
90
80
VIN=3V
70
60
VIN=4.5V
50
40
-40
-20
0
20
40
60
80
-40
-20
0
20
40
60
80
100
Temperature (°C)
Temperature (°C)
6
4601.2001.11.0.92
AAT4601
1.5A Current Limited P-Channel Switch
Functional Block Diagram
IN
OUT
Over-temp
Protection
Under-
voltage
Lockout
FAULT
SET
ON
Current
Limit
1.2V
Reference
persists, the die temperature will rise causing the
over temperature protection circuit to activate.
Functional Description
The AAT4601 is an integrated MOSFET load
switch with an adjustable current limit, over tem-
perature protection, level shifted input and a fault
flag. The current limit control is combined with an
over temperature thermal limit circuit to provide a
comprehensive system to protect the load switch
under short circuit or other adverse operating con-
ditions. The AAT4601 is ideally suited for control
and protection of peripheral ports such as USB,
RS232 and parallel ports.
If the current limit or over temperature protection
circuits are active for more then two milliseconds,
the system will be informed via the FAULT Flag.
The two millisecond delay allows the AAT4601 to
be turned on into capacitive loads without activat-
ing the FAULT Flag. The open drain FAULT output
can be connected directly to system controllers
driven by voltage levels less than the IN pin voltage
without additional level shifting circuitry.
The load switch is turned off by applying a logic high
level to the ON pin. The AAT4601 typically con-
sumes 12µA when operating, when off, the device
draws less then 1µA. In the off state, current is pre-
vented from flowing between the input and output.
The ON function has logic level thresholds that
allow the AAT4601 to be TTL compatible and may
also be controlled by 2.5V to 5.0V CMOS circuits.
The voltage level on either ON or FAULT should not
exceed the input supply level present on the IN pin.
The current limit and over temperature circuits will
act independently. The device current limit is acti-
vated when the output load current exceeds an
internal threshold level. The internal current limit
threshold is determined by an external resistor
connected between the SET pin and ground. The
minimum current limit threshold is specified by
ILIM(MIN)
. If the load switch ambient temperature
becomes excessive or if a short circuit condition
4601.2001.11.0.92
7
AAT4601
1.5A Current Limited P-Channel Switch
Applications Information
Current Limit RSET Values
Setting Current Limit
RSET
Current Device will
Limit typ not current
Device always
current limits
below:
(mA)
2029
1957
1876
1788
1707
1620
1544
1464
1394
1324
1262
1204
1107
1061
985
A simple three-step procedure can be used to
adjust the AAT4601's current limit. First, the maxi-
mum current required by the load should be deter-
mined. Second, select a resistor that guarantees
adequate current is available to the load under nor-
mal conditions. Finally, the maximum current that
can pass through the switch can be calculated and
compared to the maximum current available.
(Ω)
(mA)
limit below:
(mA)
1141
1101
1055
1006
960
470
510
560
620
680
750
820
910
1585
1529
1466
1397
1334
1266
1206
1144
1089
1034
986
Step 1: The maximum current required by a load
is usually defined in port specifications design
application references. For example, USB ports
are specified to support loads of up to 500 mA.
911
869
823
784
745
710
1000
1100
1200
1300
1500
1600
1800
2000
2200
2400
2700
3000
3300
3600
3900
4300
4700
5100
5600
6200
6800
7500
Step 2: The most convenient method for deter-
mining a current limit resistor value is to look it up
in the provided table named "Current Limit RSET
Values". Find the lowest current value that is
greater than the maximum load current in the given
application. Refer to the column named "Device
will not current limit below". The resistor value
needed is in the corresponding row named "RSET".
For example, a USB port requires 500 mA. The
lowest level where the device will current limit
above 500 mA is 516 mA. The corresponding
resistor value for RSET would be 2kΩ .
941
677
865
623
829
597
769
554
716
516
917
861
811
745
690
643
602
565
524
489
458
424
392
362
343
673
485
633
456
582
419
539
388
502
362
470
339
Step 3: Now the required resistor value has been
determined. The maximum current that can be
drawn, even with a short circuit applied to the out-
put, can be determined by reading the column
labeled "Device always current limits below". If the
power supply connected to the AAT4601's input can
provide this current level, the power supply voltage
will not collapse when a short circuit is applied to the
load switch output. For example, a notebook com-
puter has a USB port which is powered by an
AAT4601 with a 2kΩ resistor connected between
the SET pin and GND. If the power supply con-
nected to the AAT4601's IN pin can provide more
than 917 mA, this supply will remain in regulation
even if a short circuit is applied to the USB port.
442
318
410
295
382
275
358
258
332
239
306
220
283
204
268
193
8
4601.2001.11.0.92
AAT4601
1.5A Current Limited P-Channel Switch
internal temperature while current limit is not active
can be calculated using Equation 1:
Applications Information
2
Operation in Current Limit
TJ(MAX) = IMAX × RDS(ON)(MAX) × RθJA + TA(MAX)
If an excessive load is applied to the output of an
AAT4601, the load's current will be limited by the
AAT4601's current limit circuitry. Refer to the figure
named "Overload Operation". If a short circuit were
to occur on the load, it would demand more current
than what is allowed by the internal current limiting
circuit and the voltage at the AAT4601's output will
drop. This causes the AAT4601 to dissipate more
power than in normal operation, causing the die tem-
perature to increase. When die temperature exceeds
the internal over temperature threshold, the AAT4601
will shut down. After shutting down, the AAT4601
cools to a level below the over temperature thresh-
old, at which point it will start up again. The AAT4601
will continue to cycle off and on until one of the fol-
lowing events occurs; the load current is reduced to
a level below the AAT4601's current limit setting, the
input power is removed, or until the output is turned
off by a logic high level applied to the ON pin.
In Equation 1, IMAX is the maximum current required
by the load. RDS(ON)(MAX) is the maximum rated
RDS(ON) of the AAT4601 at high temperature. RθJA is
the thermal resistance between the AAT4601's die
and the board onto which it is mounted. TA(MAX) is
the maximum ambient temperature for the printed
circuit board assembly under the AAT4601 when the
load switch is not dissipating power. Equation 1 can
be transformed to provide IMAX; Refer to Equation 2.
TSD(MIN) - TA(MAX)
RDS(ON)(MAX) × RθJA
IMAX
=
TSD(MIN) is the minimum temperature required to
activate the AAT4601's over temperature protec-
tion. With typical specification of 125°C, 115°C is a
safe minimum value to use.
For example, a portable device is specified to oper-
ate in a 50°C environment. The printed circuit
board assembly will operate at temperatures as
high as 85°C. This portable device has a sealed
case and the area of the printed board assembly is
rellatively small causing RθJA to be approximately
120°C/W. Using Equation 2,
Thermal Considerations
Since the AAT4601 has internal current limit and
over temperature protection, junction temperature is
rarely a concern. If an application requires a large
load current in a high temperature operating envi-
ronment, there is the possibility that the over tem-
perature protection circuit rather than the current
limit circuit will regulate the current available to the
load. In these applications, the maximum current
available without risk of activation of the over tem-
perature circuit can be calculated. The maximum
115 - 85
130 × 120
IMAX
=
= 1.4 A
If this system requires less than 1.4 A, the thermal
limit will not activate during normal operation.
Overload Operation
6
5
4
3
2
1
0
Input Voltage
1
is applied to output at t = 0
RSET is 2 k
Output Voltage
-0.5
0
0.5
1
1.5
2
Time (s)
4601.2001.11.0.92
9
AAT4601
1.5A Current Limited P-Channel Switch
For example, USB ports are specified to have at
least 120µF of down stream capacitance from their
controlling power switch. An output capacitance as
large as 1000µF would not disturb the input power
supply to the AAT4601 used to control the USB port.
Applications Information
Input Capacitor
The input capacitor serves two purposes. First, it
protects the source power supply from transient
current effects generated by the application load
circuit. If a short circuit is suddenly applied to the
output of an AAT4601, there is a microsecond long
period during which a large can current flow before
the current limit circuitry activates. Refer to the
characteristic curve named "Short Circuit Through
0.3Ω." A properly sized input capacitor can dramat-
ically reduce the load switch input transient
response effects seen by the power supply and
other circuitry upstream from the AAT4601.
ON Input
When the AAT4601 is in the off state, the output is
an open circuit and the device quiecent current
consumption is reduced to less than 1µA. The ON
threshold voltage is set to allow the AAT4601 to be
controlled by 5 volt TTL levels as well as CMOS
power from 2.5 volts to 5 volts. The ON function
control voltage level should not exceed the input
supply level applied to the IN pin.
FAULT Output
The second purpose of the input capacitor is to
prevent transient events generated by the load cir-
cuit from affecting the operation of the AAT4601.
For example, if an AAT4601 is used in a circuit that
operates from a 3 volt power supply with poor step
load response, it is possible that turning on the load
switch could cause the input power supply to droop
below the AAT4601's under voltage lockout thresh-
old. This drop in voltage would cause the AAT4601
to turn off until the input power supply's voltage
recovers. Since this cycle would be self-perpetuat-
ing, the entire circuit could be seen to be unstable.
In the very rare case where capacitor cost is pro-
hibitive, the output load circuit should be slew rate
limited when turned on.
A FAULT flag is provided to alert a system if the load
switch is not receiving a sufficient voltage level to
operate properly. If either the current limit or over
temperature circuits in any combination are active
for more than approximately two milliseconds con-
tinuously, the FAULT pin is pulled to ground inter-
nally through a 100Ω resistance. The 2 millisecond
delay on the FAULT function is intended to prevent
capacitive loads connected to the load switch out-
put from activating FAULT when the device is
turned on. The placement of a pull up resistor
between the FAULT pin and the IN pin is recom-
mended. Reasonable values for the pull up resistor
should range from 10kΩ to 100kΩ. Since FAULT is
an open drain terminal, it may be pulled up to any
voltage that is not greater than the level present on
the IN pin. This is done to allow the AAT4601 to sig-
nal ancillary circuitry that is powered by voltage
level less than the level on the IN pin.
Output Capacitor
In order to insure stability while the device current
limit is active, a small capacitance of approximately
1µF should be used. When the AAT4601 is activat-
ed using the ON function, there are no momentary
current transients as in the case of when a short cir-
cuit suddenly applied to a device that is already on.
Refer to the characteristic curve named "Switch
Turn-On Time." No matter how big the output
capacitor, output current is limited to the value
allowed by the threshold determined by RSET and
the internal current limiting circuitry. This permits
very large output capacitors to be used.
Reverse Voltage
The AAT4601 is designed to control current flowing
from IN to OUT. If a voltage is applied to OUT
which is greater than that on IN, a large resulting
reverse current may flow, potentially damaging the
AAT4601.
10
4601.2001.11.0.92
AAT4601
1.5A Current Limited P-Channel Switch
Printed Circuit Board Layout
Recommendations
Evaluation Board Layout
The AAT4601 evaluation layout follows the printed
circuit board layout recommendations, and can be
used for good applications layout.
For proper thermal management, and to take
advantage of the low RDS(ON) of the AAT4601, a few
circuit board layout rules should be followed: VIN
and VOUT should be routed using wider than normal
traces, and GND should be connected to a ground
plane. For best performance, CIN and COUT should
be placed close to the package pins.
Note: Board layout shown is not to scale.
Figure 1: AAT4601 Evaluation
board top side silk screen
assembly drawing
Figure 2: AAT4601 Evaluation
board component side layout
Figure 3: AAT4601 Evaluation
board solder side layout
4601.2001.11.0.92
11
AAT4601
1.5A Current Limited P-Channel Switch
Ordering Information
Part Number
Package
Marking
Bulk
Tape and Reel
AAT4601IAS-T1
AAT4601IHS-T1
SOP-8
AAT4601IAS-B1
AAT4601IHS-B1
TSSOP-8
Package Information
SOP-8
Millimeters
Inches
Dim
Min
1.35
0.10
Max
1.75
0.25
Min
0.053
0.004
Max
0.069
0.010
A
A1
A2
B
C
D
E
H
1.45
1.27
0.057
0.33
0.19
4.80
3.80
0.51
0.25
5.00
4.00
0.013
0.007
0.189
0.150
0.020
0.010
0.197
0.157
D
E
e
0.050
H
L
Y
θ1
Note:
5.80
0.40
0.00
0°
6.20
1.27
0.10
8°
0.228
0.016
0.000
0°
0.244
0.050
0.004
8°
7(4x)
A
c
A2
1. PACKAGE BODY SIZES EXCLUDE MOLD FLASH
PROTRUSIONS OR GATE BURRS.
2. TOLERANCE 0.1000mm (4mil) UNLESS
OTHERWISE SPECIFIED
Q
A1
b
e
L
y
3. COPLANARITY: 0.1000mm
4. DIMENSION L IS MEASURED IN GAGE PLANE.
5. CONTROLLING DIMENSION IS MILLIMETER;
CONVERTED INCH DIMENSIONS ARE NOT
NECESSARILY EXACT.
12
4601.2001.11.0.92
AAT4601
1.5A Current Limited P-Channel Switch
TSSOP-8
Millimeters
Inches
Dim
Min
Max
1.20
0.15
1.05
0.30
Min
Max
A
A1
A2
b
1.05
0.05
-
0.041
0.002
-
0.047
0.006
0.041
0.012
0.25
0.010
DETAIL A
E
E1
c
0.127
0.005
D-8
D-28 9.60
E
E1
e
2.90
3.10
9.80
4.50
6.60
0.114
0.378
0.170
0.244
0.122
0.386
0.177
0.260
4.30
6.20
0.65 BSC
1
2
0.025 BSC
L
0.50
0.70
0.20
0.028
L1
R
R1
θ1
θ2
1.0
0.039
0.09
0.09
0°
-
-
8°
0.004
0.004
0°
-
-
8°
D
E
0.20
12°
e
R1
A2
A
R
1
L
A1
b
2
L1
DETAIL A
4601.2001.11.0.92
13
AAT4601
1.5A Current Limited P-Channel Switch
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Advanced Analogic Technologies, Inc.
1250 Oakmead Parkway, Suite 310, Sunnyvale, CA 94086
Phone (408) 524-9684
Fax (408) 524-9689
14
4601.2001.11.0.92
AAT4601IAS-B1 相关器件
| 型号 | 制造商 | 描述 | 价格 | 文档 |
| AAT4601IAS-T1 | ANALOGICTECH | 1.5A Current Limited P-Channel Switch | 获取价格 |
|
| AAT4601IHS-B1 | ANALOGICTECH | 1.5A Current Limited P-Channel Switch | 获取价格 |
|
| AAT4601IHS-T1 | ANALOGICTECH | 1.5A Current Limited P-Channel Switch | 获取价格 |
|
| AAT4601IKS-T1 | ANALOGICTECH | Power Management Circuit, PDSO8 | 获取价格 |
|
| AAT4608 | ANALOGICTECH | Current Limited Load Switch in SOT-23 Package | 获取价格 |
|
| AAT4608 | AAT | Current Limited Load Switch in SOT23 Package | 获取价格 |
|
| AAT4608IGV-1-T1 | ANALOGICTECH | Current Limited Load Switch in SOT-23 Package | 获取价格 |
|
| AAT4608IGV-T1 | ANALOGICTECH | Current Limited Load Switch in SOT-23 Package | 获取价格 |
|
| AAT4608IGV-T1 | AAT | Current Limited Load Switch in SOT23 Package | 获取价格 |
|
| AAT4610 | ANALOGICTECH | Current Limited Load Switch in SOT-23 Package | 获取价格 |
|
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