Datasheet AAT4644IHS-T1, AAT4644IHS-B1, AAT4644IAS-T1, AAT4644 Datasheet (Analogic Technologies)
Page 1
AAT4644
4-Channel Current Limited Load Switch
General Description
The AAT4644 is a four-channel resettable fuse. It
utilizes independent current-limited and thermally
protected P-channel MOSFETs to protect against
short circuits. Each switch's current limit is factory
programmed at 1A. Additional protection is provided with undervoltage lockout; the switches are
turned off when the input voltage drops below a
preset level. The quiescent supply current is typically 20µA. The AAT4644 is a flexible solution,
allowing system designers to gang outputs together for lower R
The AAT4644 is available in 8 pin TSSOP or SOP
packages, specified over -40 to 85°C.
and higher current limit.
DS(ON)
SmartSwitch
Features
• 500mA per channel steady state
• 4 X 1A current limit trip point
• Over-temp protection
• Fast transient response:
• 1µs (typ) response to short circuit
• 100mΩ typical R
• Undervoltage Lockout
• Temp range -40 to 85°C
• 8 pin TSSOP or SOP packages
Applications
• USB ports
• Peripheral ports
• Desktop PCs
DS(ON)
™
Preliminary Information
Typical Application
INPUT
3.3V - 5V
2,7 1
IN
AAT4644
GND
OUT1
OUT2
OUT3
OUT4
4
OUTPUT1
3
8
6
OUTPUT2
OUTPUT3
OUTPUT4
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4-Channel Current Limited Load Switch
Pin Descriptions
Pin # Symbol Function
1 OUT1 Channel 1 output
2, 7 IN These pins are the input supply to the circuit
3 OUT2 Channel 2 output
4 GND Ground connection
5 NC Not internally connected
6 OUT4 Channel 4 output
8 OUT3 Channel 3 output
Pin Configuration
AAT4644
OUT1
IN
OUT2
GND
SO-8 TSSOP-8
(Top View) (Top View)
1 2
OUT3
OUT1
IN
OUT4
NC
OUT2
GND
IN
1 2
1
2
3
4
8
OUT3
7
IN
6
OUT4
5
NC
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AAT4644
4-Channel Current Limited Load Switch
Absolute Maximum Ratings (T
=25°C unless otherwise noted)
A
Symbol Description Value Units
V
IN
V
OUT
I
OUT
T
J
V
ESD
T
LEAD
Note: 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.
Note 1: Human body model is a 100pF capacitor discharged through a 1.5kΩ resistor into each pin.
IN to GND -0.3 to 6 V
OUT to GND -0.3 to 6 V
Output Current Internally Limited A
Operating Junction Temperature Range -40 to 85 °C
ESD Rating1—HBM 4000 V
Maximum Soldering Temperature (at Leads) 300 °C
Thermal Characteristics
Symbol Description Value Units
Θ
JA
P
D
Note 2: Mounted on a demo board.
Maximum Thermal Resistance 100 °C/W
Maximum Power Dissipation 1.25 W
Electrical Characteristics (V
= 5V, TA= -40 to 85°C unless otherwise noted. Typical values
IN
are at TA=25°C; bold values designate full temperature range)
Symbol Description Conditions Min Typ Max Units
V
IN
I
Q
V
UVLO
V
UVLO(hys)
R
DS(ON)
I
LIM
t
RESP
T
SD
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Operation Voltage 2.7 5.5 V
Quiescent Current Vin = 5V, Iout = 0 20 40 µA
Undervoltage Lockout Rising edge 1.75 V
Undervoltage Lockout Hysteresis 0.3 V
On-Resistance Vin=5.0V,T
Current Limit Each output OUT<IN -1V 0.6 1.0 1.5 A
Current Loop Response Vin=5V 1 µs
Over-temperature threshold 125 °C
= 25°C 100 125 mΩ
A
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Typical Characteristics
(TA= 25°C unless otherwise noted)
AAT4644
4-Channel Current Limited Load Switch
Quiescent Current vs. Temperature
40
35
30
25
20
15
10
5
Quiescent Current (µA)
0
-40 -20 0 20 40 60 80 100 120
Temperature (°C)
Current Limit
2
1.5
1
Output (A)
0.5
0
012345
O
utput (V)
Quiescent Current
25
20
15
10
Input (µA)
5
0
0123456
Input (V)
Short Circuit Through 0.3 Ohm
8
6
4
2
Input and Output (V)
0
-1012345
Time (µs)
Input Voltage
Output Current
Output Voltage
12
8
4
Output (A)
0
-4
Short Circuit Through 0.6 Ohm
8
8
Thermal Shutdown Response 0.
Vin(5v/div)
6
4
2
Input and Output (V)
0
-1012345
Input Voltage
Output Voltage
Output Current
Time (µs)
6
4
Output (A)
2
0
Vout (5A/div)
Iout
(500mA/
div)
-100 0 100 200 300 400 500
Time (µs)
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(T
= 25°C unless otherwise noted)
A
Rdson vs. Temperature
150.0
140.0
130.0
120.0
110.0
100.0
Rdson (mΩ)
90.0
80.0
70.0
-40 -20 0 20 40 60 80 100 120
VIN=3V
Te
mperature (°C)
AAT4644
4-Channel Current Limited Load Switch
VIN=5V
Block Diagram
IN OUT1
Channel 1 Control
Current Limit, Over-temp
OUT2
Undervoltage
Lockout
Channel 2 Control
Current Limit, Over-temp
OUT3
Channel 3 Control
Current Limit, Over-temp
OUT4
Channel 4 Control
Current Limit, Over-temp
GND
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Ordering Information
AAT4644
4-Channel Current Limited Load Switch
Package Marking
SOP8 AAT4644IAS-B1 AAT4644IAS-T1
TSSOP8 AAT4644IHS-B1 AAT4644IHS-T1
Package Information
SOP-8
E
H
D
7(4x)
A
A2
A1
e
b
y
Q
Part Number
Bulk Tape and Reel
Dim
Millimeters Inches
Min Max Min Max
A 1.35 1.75 0.053 0.069
A1 0.10 0.25 0.004 0.010
A2 1.45 0.057
B 0.33 0.51 0.013 0.020
C 0.19 0.25 0.007 0.010
D 4.80 5.00 0.189 0.197
E 3.80 4.00 0.150 0.157
e 1.27 0.050
H 5.80 6.20 0.228 0.244
L 0.40 1.27 0.016 0.050
Y 0.00 0.10 0.000 0.004
c
L
θ10° 8° 0° 8°
Note:
1. PACKAGE BODY SIZES EXCLUDE MOLD FLASH
PROTRUSIONS OR GATE BURRS.
2. TOLERANCE 0.1000mm (4mil) UNLESS
OTHERWISE SPECIFIED
3. COPLANARITY: 0.1000mm
4. DIMENSION L IS MEASURED IN GAGE PLANE.
5. CONTROLLING DIMENSION IS MILLIMETER;
CONVERTED INCH DIMENSIONS ARE NOT
NECESSARILY EXACT.
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TSSOP-8
AAT4644
4-Channel Current Limited Load Switch
1 2
b
Dim
Millimeters Inches
Min Max Min Max
A 1.05 1.20 0.041 0.047
A1 0.05 0.15 0.002 0.006
A2 - 1.05 - 0.041
b 0.25 0.30 0.010 0.012
E
E1
DETAIL A
c 0.127 0.005
D-8 2.90 3.10 0.114 0.122
D-28 9.60 9.80 0.378 0.386
E 4.30 4.50 0.170 0.177
E1 6.20 6.60 0.244 0.260
e 0.65 BSC 0.025 BSC
L 0.50 0.70 0.20 0.028
L1 1.0 0.039
D
e
E
AA2
A1
DETAIL A
0.20
R1
R
1
L
2
L1
R 0.09 - 0.004 R1 0.09 - 0.004 -
θ10° 8° 0° 8°
θ2 12°
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AAT4644
4-Channel Current Limited Load 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
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