DATA SHEET
AAT4616: Ultrahigh Precision Adjustable Current Limited
Load Switch with Fault Flag
Applications
Description
USB ports
The AAT4616 SmartSwitch is a current-limit P-channel MOSFET
power switch designed for high-side load switching applications.
This switch operates with inputs ranging from 2.4 V to 5.5 V,
making it ideal for both 3 V and 5 V systems. An integrated, highly
accurate current-limit circuit protects the input supply against
large currents, which may cause the supply to fall out of
regulation. Reverse current blocking is provided to protect the
load switch from reverse current flows while the device is in
shutdown.
Portable products
Hot-swap supplies
Notebook computers
Proprietary peripheral ports
Features
Input voltage: 2.4 V to 5.5 V
The AAT4616 is also protected from thermal overload, which
limits power dissipation and junction temperature. Current-limit
threshold is programmed with a resistor from SET to ground, and
is adjusted for load levels up to 1.6 A. The ultrafast current limit
response to a sudden short circuit is 2 s, which reduces the
requirements of local supply bypassing. An open-drain FAULT flag
signals an over-current or over-temperature condition. To prevent
false reporting, a 4 ms time interval is used at startup (charging a
capacitive load), where fault conditions are not monitored and
reported. Quiescent current is a low 10 A and the supply current
decreases to less than 1 A in shutdown mode.
Programmable over-current limit setting: 300 mA to 1.6 A
±5% current limit precision at 750 mA
Fast transient response: 2 s response to short circuit
Low quiescent current:
10 A typical while enabled
1 A maximum with switch off
130 m typical RDS(ON)
Under-voltage lockout (UVLO)
Reverse blocking during disable
The AAT4616 is offered in small Pb-free, 5-pin SOT23-5 and
TDFN22-8 packages, and is specified for operation over the
–40°C to +85°C ambient temperature range.
4 ms fault masking at startup (capacitive load)
Fault flag open-drain output
A typical application circuit is shown in Figure 1. The pin
configuration is shown in Figure 2. Signal pin assignments and
functional pin descriptions are provided in Table 1.
Active High/Low enable options
Over-temperature protection
Temperature range: 40 °C to +85 °C
5-pin SOT23-5 and 8-pin TDFN package (MSL1, 260 °C per
JEDEC-J-STD-020)
VIN
2.4 V ~ 5.5 V
Skyworks Green™ products are compliant with
all applicable legislation and are halogen-free.
For additional information, refer to Skyworks
Definition of Green™, document number
SQ04-0074.
VOUT
OUT
IN
AAT4616
1 μF
EN/EN
SET
RSET
100 kΩ
ON/ON
GND
FLT
0.47 μF
Fault
Flag
tc79
Figure 1. AAT4616 Typical Application Circuit
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DATA SHEET • AAT4616 ULTRAHIGH PRECISION ADJUSTABLE CURRENT LIMITED LOAD SWITCH WITH FAULT FLAG
OUT
GND
SET
5
1
IN
2
3
4
ON/ON
SOT23-5
IN
IN
1
8
2
7
ON/ON
FLT
3
6
4
5
OUT
OUT
SET
GND
TDFN22-8
tc80
Figure 2. AAT4616 Pinout – 5-Pin SOT23 and 8-Pin TDFN
(Top View)
Table 1. AAT4616 Signal Descriptions
Pin #
SOT23-5
Name
Description
TDFN22-8
1
7, 8
OUT
Current-limit load switch output (high-side P-channel MOSFET drain). Connect a 0.47 F capacitor from OUT to GND for
best load transient response.
2
5
GND
IC ground connection.
3
6
SET
Current-limit set pin. Connect a resistor between this pin and ground to program the desired current limit set point.
4
3
ON/ON
5
1, 2
IN
NA
4
FLT
Load switch enable input. Active high and active low options are available.
Load switch power supply input pin (high-side P-channel MOSFET source). Bypass with a 1 F capacitor from IN to GND.
Current-limit fault flag pin, open-drain output, active low signal. Pull up with a 10 k to 100 k resistor.
Electrical and Mechanical Specifications
The absolute maximum ratings of the AAT4616 are provided in
Table 2. The recommended operating conditions are specified in
Table 3, and electrical specifications are provided in Table 4.
Typical performance characteristics of the AAT4616 are illustrated
in Figures 3 through 14.
Table 2. AAT4616 Absolute Maximum Ratings (Note 1)
Parameter
Symbol
Minimum
Typical
Maximum
Units
IN to GND
VIN
0.3
+6.0
V
ON/ON, FLT to GND
VON, VFLT
0.3
VIN 0.3
V
SET, OUT to GND
VSET, VOUT
0.3
VIN 0.3
V
Maximum DC output current (Note 2)
IMAX
Operating junction temperature range
TJ
40
+150
ºC
Storage temperature range
TSTG
40
+150
ºC
Maximum soldering temperature (at leads)
TLEAD
θJA
Thermal resistance
Power dissipation (Notes 3 and 4)
2
A
300
ºC
74
ºC/W
SOT23-5
220
ºC/W
TDFN22-8
1.35
W
SOT23-5
0.45
W
TDFN22-8
PD
Note 1: Exposure to maximum rating conditions for extended periods may reduce device reliability. There is no damage to device with only one parameter set at the limit and all other
parameters set at or below their nominal value. Exceeding any of the limits listed may result in permanent damage to the device.
Note 2: The current rating is based on long-term current density limitations.
Note 3: Mounted on an FR4 board.
Note 4: Derated 13.5 mW/ºC for TDFN22-8 package and 4.5 mW/ºC for SOT23-5 package above 25 ºC.
CAUTION: Although this device is designed to be as robust as possible, Electrostatic Discharge (ESD) can damage this device. This device
must be protected at all times from ESD. Static charges may easily produce potentials of several kilovolts on the human body
or equipment, which can discharge without detection. Industry-standard ESD precautions should be used at all times.
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DATA SHEET • AAT4616 ULTRAHIGH PRECISION ADJUSTABLE CURRENT LIMITED LOAD SWITCH WITH FAULT FLAG
Table 3. Recommended Operating Conditions
Parameter
Symbol
Minimum
Input voltage
VIN
2.4
High-level input voltage
VON(H)
1.4
Low-level input voltage
VON(L)
Operating temperature
TA
Typical
Maximum
Units
5.5
V
V
40
0.5
V
+85
ºC
Table 4. AAT4616 Electrical Specifications (Note 1)
(VIN = 5 V, TA = 40 °C to 85 °C, [Typical Values are at TA = 25 °C], Unless Otherwise Noted)
Parameter
Input voltage
Symbol
Test Condition
VIN
Min
Typical
2.4
Max
Units
5.5
V
Operation quiescent current
IQ
VIN = 5 V, ON/ON = Active, IOUT = 0 A
10
25
A
Off supply current
IQ(OFF)
ON/ON = Inactive, VIN = 5.5 V
0.01
1
A
Off switch current
ISD(OFF)
ON/ON = Inactive, VIN = 5.5 V, VOUT = 0 V
0.01
1
A
Under-voltage lockout
VUVLO
Rising edge, 1% Hysteresis
1.8
2.4
Under-voltage lockout hysteresis
VUVLO_HYS
On resistance
RDS(ON)
On-resistance temperature coefficient
10
V
mV
VIN = 5.0 V, TA = 25 °C
130
180
m
VIN = 3.0 V, TA = 25 °C
150
230
m
TCRDS
2800
Current limit
ILIM
Minimum current limit
ILIM(MIN)
RSET = 6.04 k, VOUT = VIN – 0.5 V
ON/ON input low voltage
VON(L)
VIN = 2.4 V to 5.5 V
ON/ON input high voltage
VON(H)
VIN = 2.4 V to 5.5 V
ON/ON input leakage
ION(SINK)
VON = 5.5 V
0.71
0.75
ppm/°C
0.79
300
0.5
V
1
A
7
s
1.4
V
0.01
Current limit response time
TRESP
VIN = 5 V
2
Turn-on time
tON
VIN = 5 V, RLOAD = 10
5
Turn-off time
tOFF
VIN = 5 V, RLOAD = 10
Fault flag blanking time
tBLANK
Fault flag logic low output
VFLT(L)
Fault flag logic high leakage current
IFLT(SINK)
Over-temperature shutdown threshold
TSD
Over-temperature shutdown hysteresis
TSD_HYS
8
s
s
10
4
IFLT(SINK) = 1 mA
ms
0.4
V
1
A
0.03
VIN = 5 V
A
mA
140
°C
15
°C
Note 1: Performance is guaranteed only under the conditions listed in this Table.
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DATA SHEET • AAT4616 ULTRAHIGH PRECISION ADJUSTABLE CURRENT LIMITED LOAD SWITCH WITH FAULT FLAG
Typical Performance Characteristics
1
20
0.8
Current Limit (A)
IQ (μA)
15
10
5
0.6
0.4
0.2
0
0
-40
-15
10
35
60
1
85
2
3
5
Output Voltage (V)
Temperature (°C)
Figure 4. Current Limit vs Output Voltage
(VIN = 5.0 V, TA = 25 C, RSET = 6.04 k)
Figure 3. Quiescent Current vs Temperature
(VIN = 5.0 V)
0.1
Off-Switch Current (μA)
20
Quiescent Current (μA)
4
15
10
5
0
2.4
0.08
0.06
0.04
0.02
0
2.8
3.2
3.6
4
4.4
4.8
5.2
-40
5.6
-15
10
35
60
85
Temperature (°C)
Input Voltage (V)
Figure 6. Off-Switch Current vs Temperature
(VIN = 5.5 V)
Figure 5. Quiescent Current vs Input Voltage
(TA = 25 C)
16
220
14
200
12
RSET (kΩ)
RDS(ON) (mΩ)
180
160
140
120
10
8
6
4
VIN = 5 V
100
80
-40
2
VIN = 3 V
-15
10
35
Temperature (°C)
Figure 7. RDS(ON) vs Temperature
60
85
0
300
800
1300
Output Current (mA)
Figure 8. RSET vs ILIM (TA = 25 C)
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DATA SHEET • AAT4616 ULTRAHIGH PRECISION ADJUSTABLE CURRENT LIMITED LOAD SWITCH WITH FAULT FLAG
Typical Performance Characteristics
1.6
ON(ON) Threshold (V)
1.4
VOUT
2 V/div
1.2
0
1
0.8
0.6
ON
2 V/div
VON(H)
0.4
0
VON(L)
0.2
2.4
3
3.6
4.2
4.8
5.4
6
Time 2.0 μs/div
Input Voltage (V)
Figure 9. ON(ON) Threshold vs Input Voltage
Figure 10. AAT4616IPS-1 and AAT4616IGV-1 Turn-On
(RL = 10 , CL = 0.47 F)
VOUT
2 V/div
VOUT
2 V/div
0
0
ON
IOUT
1 A/div
2 V/div
0
0
Time 2.0 μs/div
Time 5.0 μs/div
Figure 12. Short Circuit Through 0.3
(VIN = 5.0 V)
Figure 11. AAT4616IPS-1 and AAT4616IGV-1 Turn-Off
(RL = 10 , CL = 0.47 F)
VOUT
5 V/div
VOUT
2 V/div 0
0
IOUT
1 A/div 0
FLT
5 V/div 0
IOUT
1 A/div 0
Time 20.0 ms/div
Figure 13. Output Short Response
(VIN = 5.0 V)
Time 1.0 ms/div
Figure 14. Fault Blanking Time
(VIN = 5.0 V)
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DATA SHEET • AAT4616 ULTRAHIGH PRECISION ADJUSTABLE CURRENT LIMITED LOAD SWITCH WITH FAULT FLAG
Reverse
Blocking
IN
OUT
Over-Temperature
Protection
Under-Voltage
Lockout
FLT
4 ms
Delay
ON/ON
1 .2 V
Reference
Current Limit
Control
SET
GND
tc41
Figure 15. AAT4616 Functional Block Diagram
Functional Description
The AAT4616 is a single-channel current-limit load switch that
is intended to protect against short-circuit and over-current
events by current limiting to a preset level. This device also
provides a reverse current blocking feature, on/off enable
control, and a fault flag to notify a system controller of an
over-current, short-circuit, or over-temperature events.
In the event of a load current exceeding a programmed current
limit level (ILIM), a high-speed current limit loop limits the
current in a microsecond and resets to low impedance once the
short circuit condition is removed.
The AAT4616 is internally protected from thermal damage by an
over-temperature detection circuit. If the die temperature
reaches the internal thermal limit, the power device is switched
off until the die temperature cools to a level below the thermal
limit threshold. This device may operate in a thermal cycling
state indefinitely or until the over-current condition is removed.
The AAT4616 operates with input voltages ranging from 2.4 V to
5.5 V which, along with its extremely low operating current,
makes it ideal for battery-powered applications. In cases where
the input voltage drops below 2.4 V, the AAT4616 MOSFET is
protected from entering the saturated region of operation by
being automatically shut down by the under-voltage lockout
circuit.
Current limit or over-temperature conditions are reported by the
open drain FAULT output. A 4 ms masking interval prevents
false reporting during the charging of a capacitive load, which
typically occurs during device turn-on, but may also occur
during a port hot plug-in event. The AAT4616 is ideally suited
for protection of peripheral ports such as USB, RS232, and
parallel ports.
Figure 15 shows the functional block diagram.
Reverse Current Blocking
The reverse current blocking feature prevents current flowing
from OUT to IN when the device is disabled. When the device is
enabled, the electrical characteristics between IN and OUT is
still similar to an ideal switch, and current can flow in either
direction.
Application Information
Setting Current Limit
The AAT4616 current limit can be set by an external resistor
(RSET) connected from the SET pin to GND. RSET can be
calculated by the following equation:
RSET
750 mA
6 k
I LIM
where ILIM is in mA and RSET in k.
Table 5 summarizes resistor values for current limit settings.
Use 1% tolerance metal film resistors for programming the
desired current limit setting. Figure 16 shows the output current
vs. output voltage with RSET equal to 6.04 k.
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DATA SHEET • AAT4616 ULTRAHIGH PRECISION ADJUSTABLE CURRENT LIMITED LOAD SWITCH WITH FAULT FLAG
Table 5. Recommended 1% Tolerance Metal Film Resistors RSET
for Current Limit
RSET (k)
Current Limit (mA)
large the output capacitor, the output current is limited to the
value set by the AAT4616 current-limit circuitry, so very large
output capacitors can be used.
For example, USB ports are specified to have at least 120 F of
capacitance downstream from their controlling power switch.
The current limiting circuit allows an output capacitance of
1000 F or more without disturbing the upstream power supply.
15
300
8.87
500
6.04
750
4.53
1000
3.74
1200
ON/ON (Enable Input)
3.09
1400
2.8
1600
In many systems, power planes are controlled by integrated
circuits that run at lower voltages than the power planes
themselves. The enable input (ON/ON) of the AAT4616 has lowand high-threshold voltages that accommodate this condition.
The threshold voltages are compatible with 5 V TTL and
2.5 V 5 V CMOS systems.
1
Current Limit (A)
0.8
0.6
Both active-high and active-low options are available for all
packages.
0.4
Connecting to Capacitive Load
When switching the AAT4616 onto a capacitive load, the
AAT4616 charges the output capacitive load at a rate no greater
than the current limit setting.
0.2
0
1
2
3
4
5
Output Voltage (V)
Figure 16. Current Limit vs Output Voltage
(VIN = 5.0 V, TA = 25 C, RSET = 6.04 k)
Input Capacitor
The input capacitor CIN protects the power supply from current
transients generated by the load attached to the AAT4616.
When a short circuit is suddenly applied to the output of the
AAT4616, a large current, limited only by the RDS(ON) of the
MOSFET, flows for less than 1 s before the current limit
circuitry activates. In this event, a moderately sized CIN
dramatically reduces the voltage transient seen by the power
supply and by other circuitry upstream from the AAT4616.
The extremely fast short-circuit response time of the AAT4616
reduces the size requirement for CIN. CIN should be located as
close to the device VIN pin as practically possible. Ceramic,
tantalum, or aluminum electrolytic capacitors are appropriate
for CIN. There is no specific capacitor Equivalent Series
Resistance (ESR) requirement for CIN. For higher current
operation, ceramic capacitors are recommended for CIN due to
their inherent capability over tantalum capacitors to withstand
input current surges from low impedance sources such as
batteries in portable devices.
Output Capacitor
In order to ensure stability while current limit is active, a low
capacitance (approximately 0.47 F) is required. No matter how
FAULT Output
The FAULT Flag (FLT) is provided to alert the system if an
AAT4616 load is not receiving sufficient voltage to operate
properly. If current limit or over-temperature circuits in any
combination are active for more than approximately 4 ms, the
FAULT Flag is pulled to ground through an approximately 100
resistor.
The filtering of voltage or current transients of less than 4 ms
prevents capacitive loads connected to the AAT4616 output
from activating the FAULT Flag when they are initially attached.
Pull-up resistances of 10 k to 100 k are recommended.
Since FLT is an open-drain terminal; it may be pulled up to any
unrelated voltage less than the maximum operating voltage of
5.5 V, allowing for level shifting between circuits.
Thermal Considerations
Since the AAT4616 has internal current limit and overtemperature protection, junction temperature is rarely a concern.
However, if the application requires large currents in a hot
environment, it is possible that temperature, rather than current
limit, is the dominant regulating condition. In these applications,
the maximum current available without risk of an overtemperature condition must be calculated. The maximum
internal temperature while current limit is not active can be
calculated using the following equation:
2
TJ ( MAX ) I MAX
( OUT ) _ SW ( MAX ) R DS ( ON )( MAX ) RJA T A( MAX ) (1)
where:
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DATA SHEET • AAT4616 ULTRAHIGH PRECISION ADJUSTABLE CURRENT LIMITED LOAD SWITCH WITH FAULT FLAG
IMAX is the maximum current required by the load.
RJA to be approximately 74 °C/W (TDFN22-8 package) and
220 °C/W (SOT23-5 package). Using equation (2):
RDS(ON)(MAX) is the maximum rated RDS(ON) of the AAT4616 at
high temperature.
I MAX
RJA is the thermal resistance between the AAT4616 die and
the board onto which it is mounted.
I MAX
Rearranging the equation to solve for IMAX:
TSD ( MIN ) TA( MAX )
(2)
RDS ( ON )( MAX ) RJA
for TDFN22-8
125 85
0.23 220
for SOT23-5
or
TA(MAX) is the maximum temperature that the PCB under the
AAT4616 would be if the AAT4616 were not dissipating power.
I MAX
125 85
0.23 74
Note that TJ(MAX) has been replaced by TSD(MIN), the minimum
temperature required to activate the AAT4616's overtemperature protection. With the typical specification of 140 °C,
125 °C is a safe minimum value to use.
For example, if an application is specified to operate in 50 °C
environments, the PCB operates at temperatures as high as
85 °C. The application is sealed and its PCB is small, causing
Evaluation Board Information
The AAT4616IPS evaluation board schematic diagram is
provided in Figure 17, and the PCB layer details are shown in
Figure 18.
The AAT4616IGV evaluation board schematic diagram is
provided in Figure 19, and the PCB layer details are shown in
Figure 20. Table 6 lists the AAT4616 evaluation board bill of
materials.
U1
1
VIN
2
R2
J1
C1
1 μF
1
2
3
4
100 kΩ
3
OUT
8
IN
OUT
7
FLT
SET
ON/ON
GND
IN
6
VOUT
RSET
6.04 kΩ
C2
0.47 μF
5
AAT4616IPS
tc81
Figure 17. AAT4616IPS Evaluation Board Schematic
(a) Top layer
(b) Bottom layer
tc82
Figure 18. AAT4616IPS Evaluation Board Layer Details
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DATA SHEET • AAT4616 ULTRAHIGH PRECISION ADJUSTABLE CURRENT LIMITED LOAD SWITCH WITH FAULT FLAG
U1
5
VIN
IN
J1
C1
1 μF
OUT
SET
1
2
3
4
ON/ON
GND
1
3
VOUT
RSET
6.04 kΩ
2
C2
0.47 μF
AAT4616IGV
tc83
Figure 19. AAT4616IGV Evaluation Board Schematic
(b) Bottom layer
(a) Top layer
tc84
Figure 20. AAT4616IGV Evaluation Board Layer Details
Table 6. AAT4616 Evaluation Board Bill of Materials
Component
Part Number
Description
Manufacturer
U1
AAT4616
Current limited load switch
Skyworks
C1
GRM188R71C105K
Capacitor ceramic, 1 F, 0603 X7R, 16 V, 10%
Murata
C2
GRM188R71C474K
Capacitor ceramic, 0.47 F, 0603 X7R, 16 V, 10%
Murata
Rset
Chip Resistor
Resistor, 6.04 k, 1/16 W, 1%, 0603 SMD
Vishay
R2
Chip Resistor
Resistor, 100 k, 1/16 W, 1%, 0603 SMD
Vishay
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DATA SHEET • AAT4616 ULTRAHIGH PRECISION ADJUSTABLE CURRENT LIMITED LOAD SWITCH WITH FAULT FLAG
Package Information
Package dimensions for the TDFN22-8 are shown in Figure 21,
and tape and reel dimensions are provided in Figure 22.
Package dimensions for the SOT23-5 are shown in Figure 19,
and tape and reel dimensions are provided in Figure 20.
2.85 ± 0.15
1.90 BSC
2.80 ± 0.20
1.575 ± 0.125
0.95
BSC
0.075 ± 0.075
10°° ± 5°°
0.15 ± 0.07
4°° ± 4°°
1.10 ± 0.20
0.60 REF
1.20 ± 0.25
Top View
0.60 REF
0.40 ± 0.10
Side View
0.45 ± 0.15
GAUGE PLANE
0.10 BSC
Front View
All dimensions are in millimeters.
tc12
Figure 19. AAT4616 SOT23-5 Package Dimensions
1.40 ± 0.10
4.00 ± 0.10
2.00 ± 0.05
1.50 ± 0.10
3.50 ± 0.05
3.05 ± 0.05
8.00 ± 0.30
1.75 ± 0.05
Pin 1 Location
3.15 ± 0.05
0.20 ± 0.03
4.00 ± 0.10
All dimensions are in millimeters.
Figure 20. AAT4616 Tape and Reel Dimensions (SOT23-5)
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tc85
DATA SHEET • AAT4616 ULTRAHIGH PRECISION ADJUSTABLE CURRENT LIMITED LOAD SWITCH WITH FAULT FLAG
0.350 ± 0.100
Index Area
Detail "A"
0.1 REF
(optional)
1.270 ± 0.050
C0.3
Pin 1 Indicator
(optional)
2.000 ± 0.050
Top View
0.450 ± 0.050
2.000 ± 0.050
0.600 ± 0.050
0.230 ± 0.050
Bottom View
Detail "A"
0.229 ± 0.051
0.850 MAX
4x
0.050 ± 0.050
Side View
All dimensions are in millimeters.
tc86
Figure 21. AAT4616 TDFN22-8 Package Dimensions
4.00 ± 0.10
1.75 ± 0.10
2.00 ± 0.05
3.50 ± 0.05
1.00 ± 0.05
8.10 ± 0.20
1.50 ± 0.10
2.30 ± 0.05
Pin 1 Location
2.30 ± 0.05
0.30 ± 0.05
4.00 ± 0.10
tc45
All dimensions are in millimeters.
Figure 22. AAT4616 Tape and Reel Dimensions (TDFN22-8)
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201940E • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • September 11, 2013
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DATA SHEET • AAT4616 ULTRAHIGH PRECISION ADJUSTABLE CURRENT LIMITED LOAD SWITCH WITH FAULT FLAG
Ordering Information
Model Name
AAT4616 ultra high precision adjustable
current limited load switch with fault flag
Enable Input
Package
Marking
(Note 1)
Manufacturing Part Number
(Note 2)
Evaluation Board Part Number
Active High
TDFN22-8
R8XYY
AAT4616IPS-1-T1
AAT4616IPS-1-EVB
Active Low
TDFN22-8
U6VBF
AAT4616IPS-T1
AAT4616IPS-EVB
Active High
SOT23-5
R7XYY
AAT4616IGV-1-T1
AAT4616IGV-1-EVB
Active Low
SOT23-5
U5IBF
AAT4616IGV-T1
AAT4616IGV-EVB
Note 1: XYY = assembly and date code.
Note 2: Sample stock is generally held on part numbers listed in BOLD.
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September 11, 2013 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201940E
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