AAT AAT4610IGV-1-T1

AAT4610
Current Limited Load Switch
General Description
Features
The AAT4610 SmartSwitch is a current limited Pchannel MOSFET power switch designed for highside 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 currents which may cause the supply
to fall out of regulation. The AAT4610 is also protected from thermal overload which limits power dissipation and junction temperatures. It can be used
to control loads that require up to 1A. Current limit
threshold is programmed with a resistor from SET to
ground. The quiescent supply current is typically a
low 15µA max. In shutdown mode, the supply current decreases to less than 1µA.
•
•
•
SmartSwitch™
NO
T
FO R
R EC
NE O
M
W M
DE EN
SI DE
G
NS D
Input Voltage Range: 2.7V to 5.5V
Programmable Over-Current Threshold
Fast Transient Response:
— <1µs Response to Short Circuit
Low Quiescent Current
— 15µA Typical
— 1µA Max with Switch Off
160mΩ Typical RDS(ON)
Only 2.5V Needed for ON/OFF Control
Under-Voltage Lockout
Thermal Shutdown
4kV ESD Rating
UL Approved—File No. E217765
5-Pin SOT23 Package
Temperature Range: -40°C to +85°C
The AAT4610 is available in a Pb-free 5-pin SOT23
package and is specified over the -40°C to +85°C
temperature range.
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•
•
•
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Applications
•
•
•
•
Hot Swap Supplies
Notebook Computers
Peripheral Ports
Personal Communication Devices
UL Recognized Component
Typical Application
INPUT
OUTPUT
IN
OUT
AAT4610
ON (ON)
SET
ON/(ON)
GND
1μF
RSET
0.47μF
GND
4610.2006.09.1.3
GND
Not recommended for new designs; pin-for-pin upgrade: AAT4610A.
1
AAT4610
Current Limited Load Switch
Pin Descriptions
Pin #
Symbol
Function
1
OUT
P-channel MOSFET drain. Connect 0.47µF capacitor from OUT to GND.
2
GND
Ground connection
3
SET
Current limit set input. A resistor from SET to ground sets the current limit for
the switch.
4
ON
Enable input. Two versions are available, active-high and active-low. See
Ordering Information for details.
5
IN
P-channel MOSFET source. Connect 1µF capacitor from IN to GND.
Pin Configuration
2
SOT23-5
(Top View)
OUT
1
GND
2
SET
3
5
IN
4
ON
Not recommended for new designs; pin-for-pin upgrade: AAT4610A.
4610.2006.09.1.3
AAT4610
Current Limited Load Switch
Absolute Maximum Ratings1
TA = 25°C, unless otherwise noted.
Symbol
Description
VIN
VON
VSET, VOUT
IMAX
TJ
TLEAD
VESD
IN to GND
ON (ON) to GND
SET, OUT to GND
Maximum Continuous Switch Current
Operating Junction Temperature Range
Maximum Soldering Temperature (at leads)
ESD Rating2 - HBM
Value
Units
-0.3 to 6
-0.3 to VIN + 0.3
-0.3 to VIN + 0.3
2
-40 to 150
300
4000
V
V
V
A
°C
°C
V
Value
Units
150
667
°C/W
mW
Thermal Characteristics3
Symbol
ΘJA
PD
Description
Thermal Resistance
Power Dissipation
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions specified is not implied. Only one Absolute Maximum Rating should be applied at any one time.
2. Human body model is a 100pF capacitor discharged through a 1.5kΩ resistor into each pin.
3. Mounted on a demo board.
4610.2006.09.1.3
Not recommended for new designs; pin-for-pin upgrade: AAT4610A.
3
AAT4610
Current Limited Load Switch
Electrical Characteristics
VIN = 5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = 25°C.
Symbol
VIN
IQ
IQ(OFF)
ISD(OFF)
VUVLO
RDS(ON)
On Resistance
ILIM
ILIM(MIN)
VON(L)
4
Description
Operation Voltage
Quiescent Current
Off Supply Current
Off Switch Current
Under-Voltage Lockout
Current Limit
Minimum Current Limit
ON (ON) Input Low Voltage
VON(H)
ON (ON) Input High Voltage
ION(SINK)
TRESP
TOFF
TON
ON (ON) Input leakage
Current Limit Response Time
Turn-Off Time
Turn-On Time
TSD
Over-Temperature Threshold
Conditions
Min
Typ
2.7
VIN = 5V, ON (ON) = Active, IOUT = 0
ON (ON) = Inactive, VIN = 5.5V
ON (ON) = Inactive, VIN = 5.5V, VOUT = 0
Rising Edge, 1% Hysteresis
VIN = 5.0V
VIN = 4.5V
VIN = 3.0V
RSET = 6.8kΩ
15
2.0
0.75
0.03
2.3
160
165
195
1
150
Max Units
5.5
30
1
15
2.7
180
mΩ
230
1.25
0.8
VIN = 2.7V to 3.6V
VIN = 4.5V to 5.5V
VON = 5.5V
VIN = 5V
VIN = 5V, RL = 10Ω
VIN = 5V, RL = 10Ω
TJ Increasing
VIN = 5V
TJ Decreasing
2.0
2.4
Not recommended for new designs; pin-for-pin upgrade: AAT4610A.
V
µA
µA
µA
V
A
mA
V
V
0.01
0.8
0.4
40
125
115
1
2
200
µA
µs
µs
µs
°C
4610.2006.09.1.3
AAT4610
Current Limited Load Switch
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
Quiescent Current vs. Input Voltage
25
40
Input Current (µA)
Quiescent Current (µA)
Quiescent Current vs. Temperature
20
15
10
5
0
-40
-20
0
20
40
60
80
100
120
30
20
10
0
2.5
Temperature (°C)
3
3.5
(RSET = 16kΩ)
5
5.5
250
0.6
200
RDS(ON) (mΩ)
Output Current (A)
4.5
RDS(ON) vs. Temperature
Output Current vs. Output Voltage
0.4
0.2
Input = 3V
150
Input = 5V
100
50
0
0
-40
0
1
2
3
4
-20
0
5
Off-Supply Current vs. Temperature
40
60
80
100
Off-Switch Current vs. Temperature
10
Off-Switch Current (µA)
10
1
0.1
0.01
-40
20
Temperature (°C)
Output Voltage (V)
Off-Supply Current (µA)
4
Input Voltage (V)
-20
0
20
40
60
80
Temperature (°C)
4610.2006.09.1.3
100
120
1
0.1
0.01
0.001
-40
-20
0
20
40
60
80
100
120
Temperature (°C)
Not recommended for new designs; pin-for-pin upgrade: AAT4610A.
5
AAT4610
Current Limited Load Switch
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
Turn-On Time vs. Temperature
Turn-Off Time vs. Temperature
80
0.45
0.4
Turn-Off Time (µs)
Turn-On Time (µs)
70
VIN = 3V
60
50
40
30
VIN = 5V
20
10
VIN = 3V
0.35
0.3
0.25
VIN = 5V
0.2
0.15
0.1
0.05
0
0
- 40
- 20
0
20
40
60
80
- 40
100
- 20
0
Temperature (°C)
80
100
(RL = 10Ω; IOUT = ILIMIT)
6
6
5
5
ON
Output
4
Voltage (V)
4
Voltage (V)
60
Turn Off
Turn On
3
2
1
3
2
ON
1
Output
0
0
-1
- 20
0
20
40
-1
- 0.5
60
0
Time (µs)
8
4
Output Current
4
2
0
Output Voltage
0
-4
2
Time (µs)
3
8
9
6
6
Input Voltage
4
3
Output Current
2
0
Output Voltage
0
Output Current (A)
Input Voltage
Output Current (A)
6
Input and Output Voltage (V)
12
1
1
Short-Circuit Through 0.6Ω
8
0
0.5
Time (µs)
Short-Circuit Through 0.3Ω
Input and Output Voltage (V)
40
Temperature (°C)
(RL = 10Ω; CL = 0.47µF; IOUT = ILIMIT)
6
20
-3
0
1
2
3
Time (µs)
Not recommended for new designs; pin-for-pin upgrade: AAT4610A.
4610.2006.09.1.3
AAT4610
Current Limited Load Switch
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
RSET vs. ILIM
RSET Coefficient vs. ILIM
10
RSET ILIM Product (kV)
RSET (kΩ)
100
10
1
0.1
9
8
7
6
5
1
10
ILIM (A)
0
0.5
1
1.5
2
ILIM (A)
Current Limit vs. Temperature
(RSET = 22.1kΩ; VIN - VOUT = 0.5V)
Current Limit (%)
6
4
2
0
-2
-4
-6
-50
- 25
0
25
50
75
100
Temperature (°C)
4610.2006.09.1.3
Not recommended for new designs; pin-for-pin upgrade: AAT4610A.
7
AAT4610
Current Limited Load Switch
Functional Block Diagram
IN
OUT
Over-Temperature
Protection
UnderVoltage
Lockout
ON (ON)
1.2V
Reference
SET
Current
Limit
RSET
GND
Ω
Applications Information
1.2
Setting Current Limit
8
0.8
I LIM (A)
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 1), plus the operating temperature. See the charts "Current Limit vs.
Temperature" and "Output Current vs. VOUT" in the
Typical Characteristics section of this datasheet.
Together, these three factors add up to a ±25% tolerance (see ILIM specification in the Electrical
Characteristics section of this datasheet). Figure 1
shows a cold device with a statistically higher current limit, and a hot device with a statistically lower
current limit, both with RSET equal to 10.5kΩ. While
the chart, "RSET vs. ILIM" indicates an ILIM of 0.7A
with an RSET of 10.5kΩ, this figure shows that the
actual current limit will be at least 0.525A, and no
greater than 0.880A.
Device with high current limit at -40°C
0.88A
1
0.6
0.525A
0.4
Device with low current limit at 85°C
0.2
0
0
1
2
3
4
5
VOUT (V)
Ω.
Figure 1: Output Current Using 10.5kΩ
To determine RSET, start with the maximum current
drawn by the load, and multiply it by 1.33 (typical_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,
Not recommended for new designs; pin-for-pin upgrade: AAT4610A.
4610.2006.09.1.3
AAT4610
Current Limited Load Switch
the value of RSET may also be calculated using the
ILIM RSET product found in the chart "RSET
Coefficient 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 Table 1.
Device Will Device Always
Current Not Current Current Limits
RSET
Limit
Limit Below
Below
Ω) Typ (mA)
(kΩ
(mA)
(mA)
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
150
188
225
263
300
338
375
413
450
525
600
675
750
825
900
975
1050
250
313
375
438
500
563
625
688
750
875
1000
1125
1250
1375
1500
1625
1750
imately 0.700A as a typical ILIM value for 10.5kΩ.
Multiplying 0.700A by 0.75 and 1.25 shows that the
AAT4610 will limit the load current to greater than
0.525A but less than 0.875A.
Operation in Current Limit
When a heavy load is applied to the output of the
AAT4610, the load current is limited to the value of
ILIM determined by RSET (see Figure 2). Since the
load is demanding more current than ILIM, the voltage at the output drops. This causes the AAT4610 to
dissipate a larger than normal quantity of power, and
results in increased die temperature. When the die
temperature exceeds an over-temperature limit, the
AAT4610 will shut down until is has cooled sufficiently, at which point it will start up again. The
AAT4610 will continue to cycle on and off until the
load is removed, power is removed, or until a logic
high level is applied to ON (Pin 4).
Enable Input
In many systems, power planes are controlled by
integrated circuits which run at lower voltages than
the power plane itself. The enable input ON (Pin 4)
of the AAT4610 has low and high threshold voltages that accommodate this condition. The threshold voltages are compatible with 5V TTL and 2.5V
to 5V CMOS.
Table 1: Current Limit RSET Values.
Reverse Voltage
Example: A USB port requires 0.5A. 0.5A multiplied
by 1.33 is 0.665A. From the chart "RSET vs. ILIM," RSET
should be less than 11kΩ. 10.5 kΩ is a standard value
that is a little less than 11kΩ. The chart gives approx-
The AAT4610 is designed to control current flowing
from IN to OUT. If a voltage is applied to OUT which
is greater than the voltage on IN, large currents may
flow. This could damage the AAT4610.
1
0.5
0.25
0
5
Output Current
4
3
1Ω load is turned on at time = 0
Output Voltage
2
Output Current (A)
Output Voltage (V)
0.75
1
0
-0.05
0
0.05
0.1
0.15
0.2
0.25
0.3
Figure 2: Overload Operation.
4610.2006.09.1.3
Not recommended for new designs; pin-for-pin upgrade: AAT4610A.
9
AAT4610
Current Limited Load Switch
Ordering Information
Package
Enable
Marking1
Part Number (Tape and Reel)2
SOT23-5
ON (active low)
AAXYY
AAT4610IGV-T1
SOT23-5
ON (active high)
AWXYY
AAT4610IGV-1-T1
All AnalogicTech products are offered in Pb-free packaging. The term “Pb-free” means
semiconductor products that are in compliance with current RoHS standards, including
the requirement that lead not exceed 0.1% by weight in homogeneous materials. For more
information, please visit our website at http://www.analogictech.com/pbfree.
Package Information
SOT23-5
2.85 ± 0.15
1.90 BSC
0.40 ± 0.10
0.075 ± 0.075
0.15 ± 0.07
4° ± 4°
10° ± 5°
1.10 ± 0.20
0.60 REF
1.20 ± 0.25
2.80 ± 0.20
1.575 ± 0.125
0.95
BSC
0.60 REF
0.45 ± 0.15
GAUGE PLANE
0.10 BSC
All dimensions in millimeters
1. XYY = assembly and date code.
2. Sample stock is generally held on all part numbers listed in BOLD.
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830 E. Arques Avenue, Sunnyvale, CA 94085
Phone (408) 737-4600
Fax (408) 737-4611
10
Not recommended for new designs; pin-for-pin upgrade: AAT4610A.
4610.2006.09.1.3