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PDF AAT4601A Data sheet ( Hoja de datos )
| Número de pieza | AAT4601A | |
| Descripción | 1.8A Current Limited P-Channel Switch | |
| Fabricantes | Advanced Analogic Technologies | |
| Logotipo |  |
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AAT4601Awww.DataSheet4U.com
1.8A Current Limited P-Channel Switch
General Description
Features
SmartSwitch™
The AAT4601A SmartSwitch is a member of
AnalogicTech's Application Specific Power
MOSFET™ (ASPM™) product family. It is a 1.8A
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 systems.
An integrated current-limiting circuit protects the
input supply against large changes in load current
which could cause the supply to fall out of regula-
tion. The AAT4601A has protection from thermal
overload which limits power dissipation and junction
temperatures. The maximum current limit level will
guarantee that 1.8A can be delivered to the load;
the actual threshold is programmed with a resistor
from the SET pin to ground. The quiescent supply
current is typically 12µA. In shutdown mode, the
supply current decreases to less than 1µA.
The AAT4601A is available in a Pb-free, 8-pin SOP,
TSSOP, or MSOP package and is specified over
the -40°C to +85°C temperature range.
• Input Voltage: 2.7V to 5.5V
• 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
• Under-Voltage Lockout
• Temperature Range: -40°C to +85°C
• 4kV ESD rating
• UL Approved—File No. E217765
• 8-Pin SOP, TSSOP, or MSOP Package
Applications
• Hot Swap Supplies
• Notebook Computers
• Peripheral Ports
• USB Ports
Typical Application
UL Recognized Component
INPUT
1µF
100kΩ
ON
1 IN
2
IN
AAT4601A
8 FAULT
3 ON
GND
4
OUT
OUT
6
7
SET 5
R SET
OUTPUT
1µF
4601A.2006.05.1.5
1
1 page  
AAT4601Awww.DataSheet4U.com
1.8A Current Limited P-Channel Switch
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
25
20
15
10
5
0
0123456
Input Voltage (V)
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0
Current Limit
(RSET = 20.5kΩ; VIN = 5.0V)
1 23 4
Output Voltage (V)
5
Off-Supply Current vs. Temperature
10
1
0.1
0.01
0.001
0.0001
-40
-20
0
20 40 60 80 100 120 140
Temperature (°C)
4601A.2006.05.1.5
25000
24000
23000
22000
21000
20000
19000
18000
0.0
RSET * ILIM Product vs. ILIM
0.5 1.0 1.5
Typical I LIM (A)
2.0
2.5
Off-Switch Current vs. Temperature
10
1
0.1
0.01
0.001
0.0001
-40 -20
0
20 40 60 80 100 120 140
Temperature (°C)
5
5 Page 
AAT4601Awww.DataSheet4U.com
1.8A Current Limited P-Channel Switch
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 circuit board
assembly is relatively small, causing RθJA to be
approximately 120°C/W. Using Equation 2:
Eq. 3: IMAX =
115 - 85
130 · 120
=
1.4A
If this system requires less than 1.4A, the thermal
limit will not activate during normal operation.
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 AAT4601A, there is a microsecond-
long period during which a large current can flow
before the current limit circuitry activates; refer to
the characteristic curve, "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 AAT4601A.
The second purpose of the input capacitor is to
prevent transient events generated by the load cir-
cuit from affecting operation of the AAT4601A. For
example, if an AAT4601A is used in a circuit that
operates from a 3V 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 AAT4601A's under-voltage lockout
threshold. This drop in voltage would cause the
AAT4601A to turn off until the input power supply's
voltage recovers. Since this cycle would be self-
perpetuating, the entire circuit could be seen to be
unstable. In the very rare case where capacitor
cost is prohibitive, the output load circuit should be
slew rate limited when turned on.
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 AAT4601A is acti-
vated using the ON function, there are no momen-
tary current transients, as in the case when a short
circuit is suddenly applied to a device that is already
on; refer to the characteristic curve, "Switch Turn-On
Time." No matter how big the output capacitor, out-
put current is limited to the value allowed by the
threshold determined by RSET and the internal cur-
rent limiting circuitry. This permits very large output
capacitors to be used.
For example, USB ports are specified to have at least
120µF of downstream capacitance from their control-
ling power switch. An output capacitance as large as
1000µF would not disturb the input power supply to
the AAT4601A used to control the USB port.
ON Input
When the AAT4601A 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 AAT4601A to
be controlled by 5V TTL levels as well as CMOS
power from 2.5V to 5V. The ON function control
voltage level should not exceed the input supply
level applied to the IN pin.
FAULT Output
A FAULT flag is provided to alert a system if the load
switch is not receiving a sufficient voltage level to
properly operate. If either the current limit or over-
temperature circuits in any combination are contin-
uously active for more than approximately 2ms, the
FAULT pin is pulled to ground internally through a
100Ω resistance. The 2ms delay on the FAULT
function is intended to prevent capacitive loads con-
nected to the load switch output from activating
FAULT when the device is turned on. The place-
ment of a pull-up resistor between the FAULT pin
and the IN pin is recommended. Reasonable val-
ues for the pull-up resistor should range from 10kΩ
to 100kΩ. Since FAULT is an open drain terminal,
4601A.2006.05.1.5
11
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| PDF Descargar | [ Datasheet AAT4601A.PDF ] | |
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