ANALOGICTECH AAT4644IAS-B1

AAT4644
4-Channel Current Limited Load Switch
General Description
Features
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 RDS(ON) and higher current limit.
•
•
•
•
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 RDS(ON)
Undervoltage Lockout
Temp range -40 to 85°C
8 pin TSSOP or SOP packages
•
•
•
•
Preliminary Information
The AAT4644 is available in 8 pin TSSOP or SOP
packages, specified over -40 to 85°C.
SmartSwitch™
Applications
•
•
•
USB ports
Peripheral ports
Desktop PCs
Typical Application
INPUT
3.3V - 5V
2,7
IN
OUT1
AAT4644
OUT2
OUT3
GND
OUT4
1
3
8
6
OUTPUT1
OUTPUT2
OUTPUT3
OUTPUT4
4
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AAT4644
4-Channel Current Limited Load Switch
Pin Descriptions
Pin #
Symbol
Function
1
OUT1
2, 7
IN
3
OUT2
Channel 2 output
4
GND
Ground connection
5
NC
6
OUT4
Channel 4 output
8
OUT3
Channel 3 output
Channel 1 output
These pins are the input supply to the circuit
Not internally connected
Pin Configuration
SO-8
(Top View)
OUT1
IN
OUT2
GND
1
2
8
7
2
OUT3
IN
OUT4
NC
1
2
2
IN
OUT2
GND
1
OUT1
TSSOP-8
(Top View)
3
6
4
5
OUT3
IN
OUT4
NC
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AAT4644
4-Channel Current Limited Load Switch
Absolute Maximum Ratings
Symbol
(TA=25°C unless otherwise noted)
Value
Units
IN to GND
-0.3 to 6
V
VOUT
OUT to GND
-0.3 to 6
V
IOUT
Output Current
Internally Limited
A
-40 to 85
°C
VIN
TJ
Description
Operating Junction Temperature Range
VESD
ESD Rating1—HBM
4000
V
TLEAD
Maximum Soldering Temperature (at Leads)
300
°C
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.
Thermal Characteristics
Symbol
Description
Value
Units
ΘJA
Maximum Thermal Resistance
100
°C/W
PD
Maximum Power Dissipation
1.25
W
Note 2: Mounted on a demo board.
Electrical Characteristics
(VIN = 5V, TA = -40 to 85°C unless otherwise noted. Typical values
are at TA=25°C; bold values designate full temperature range)
Symbol
VIN
IQ
VUVLO
VUVLO(hys)
RDS(ON)
ILIM
tRESP
TSD
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Description
Operation Voltage
Quiescent Current
Undervoltage Lockout
Undervoltage Lockout Hysteresis
On-Resistance
Current Limit
Current Loop Response
Over-temperature threshold
Conditions
Min
Typ
2.7
Vin = 5V, Iout = 0
Rising edge
Vin=5.0V,TA = 25°C
Each output OUT<IN -1V
Vin=5V
0.6
20
1.75
0.3
100
1.0
1
125
Max
Units
5.5
40
V
µA
V
V
mΩ
A
µs
°C
125
1.5
3
AAT4644
4-Channel Current Limited Load Switch
Typical Characteristics
(TA = 25°C unless otherwise noted)
Quiescent Current
40
25
35
20
30
Input (µA)
25
20
15
15
10
10
5
5
0
0
-40
-20
0
20
40
60
80
100
120
0
1
2
3
Temperature (°C)
6
Short Circuit Through 0.3 Ohm
2
8
Input and Output (V)
Output (A)
5
Input (V)
Current Limit
1.5
1
0.5
0
12
Input Voltage
6
8
4
4
Output Current
Output Voltage
2
0
0
0
1
2
3
4
5
-4
-1
0
1
Output (V)
2
3
4
5
Time (µs)
Thermal Shutdown Response 0.
Short Circuit Through 0.6 Ohm
8
8
Vin(5v/div)
6
Input Voltage
6
4
Output Voltage
4
2
2
Output Current
0
Output (A)
Input and Output (V)
4
Output (A)
Quiescent Current (µA)
Quiescent Current vs. Temperature
Vout (5A/div)
Iout
(500mA/
div)
0
-1
0
1
2
Time (µs)
3
4
5
-100
0
100
200
300
400
500
Time (µs)
4
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AAT4644
4-Channel Current Limited Load Switch
(TA = 25°C unless otherwise noted)
Rdson vs. Temperature
150.0
Rdson (mΩ)
140.0
130.0
VIN=3V
120.0
110.0
100.0
VIN=5V
90.0
80.0
70.0
-40
-20
0
20
40
60
80
100
120
Temperature (°C)
Block Diagram
IN
OUT1
Channel 1 Control
Current Limit, Over-temp
OUT2
Channel 2 Control
Current Limit, Over-temp
Undervoltage
Lockout
OUT3
Channel 3 Control
Current Limit, Over-temp
OUT4
Channel 4 Control
Current Limit, Over-temp
GND
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AAT4644
4-Channel Current Limited Load Switch
Ordering Information
Package
Marking
Part Number
Bulk
Tape and Reel
SOP8
AAT4644IAS-B1
AAT4644IAS-T1
TSSOP8
AAT4644IHS-B1
AAT4644IHS-T1
Package Information
SOP-8
Dim
E H
D
7 (4x)
A
c
A2
Q
b
y
6
e
A1
L
A
A1
A2
B
C
D
E
e
H
L
Y
θ1
Millimeters
Min
Max
1.35
1.75
0.10
0.25
1.45
0.33
0.51
0.19
0.25
4.80
5.00
3.80
4.00
1.27
5.80
6.20
0.40
1.27
0.00
0.10
0°
8°
Inches
Min
Max
0.053
0.069
0.004
0.010
0.057
0.013
0.020
0.007
0.010
0.189
0.197
0.150
0.157
0.050
0.228
0.244
0.016
0.050
0.000
0.004
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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AAT4644
4-Channel Current Limited Load Switch
TSSOP-8
Dim
E
1
DETAIL A
E1
2
D
E
0.20
e
R1
A2
A
A
A1
A2
b
c
D-8
D-28
E
E1
e
L
L1
R
R1
θ1
θ2
Millimeters
Min
Max
1.05
1.20
0.05
0.15
1.05
0.25
0.30
0.127
2.90
3.10
9.60
9.80
4.30
4.50
6.20
6.60
0.65 BSC
0.50
0.70
1.0
0.09
0.09
0°
8°
Inches
Min
Max
0.041
0.047
0.002
0.006
0.041
0.010
0.012
0.005
0.114
0.122
0.378
0.386
0.170
0.177
0.244
0.260
0.025 BSC
0.20
0.028
0.039
0.004
0.004
0°
8°
12°
R
1
A1
b
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L
DETAIL A
2
L1
7
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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