Dual-Input, Dual-Output Load Switch
General Description
The AAT4670 SmartSwitch is a member of
AnalogicTech’s Application Specific Power MOS-
FET™ (ASPM™) product family. The AAT4670
consists of dual, independent, 1A current limited,
slew rate controlled P-channel MOSFET power
switches with a dedicated source and drain pin
assigned to each switch. The internal circuitry auto-
matically derives power from the higher of the two
input power source pins with a low operating quies-
cent current of 18µA. In shutdown mode, the supply
current decreases to less than 1µA. The switches
operate with inputs ranging from 2.2V to 5.5V, mak-
ing them ideal for 2.5V, 3V, and 5V systems. The
dual configuration permits integration of the load
switch function for systems with two different power
busses. Independent under-voltage lockout circuits
will shut down the corresponding switch if its input
voltage falls below the under-voltage lockout thresh-
old. If the die temperature reaches the thermal limit,
both switches thermal cycle off and on indefinitely
without damage until the thermal condition is
removed. An open drain FAULT output signals an
over-current or over-temperature condition for each
channel. Input logic levels are TTL compatible.
The AAT4670 is available in a Pb-free, space-sav-
ing, thermally-enhanced TDFN 3x3x0.8mm 12-lead
package. The device is also available in a Pb-free
8-pin SOP, TSSOP, or MSOP package and is spec-
ified over the -40°C to +85°C temperature range.
AAT4670
Features
•
•
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•
•
•
•
•
•
•
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SmartSwitch
™
2.2V to 5.5V Input Voltage Range
1A Current Limit Per Channel
95mΩ Typical R
DS(ON)
Fast Transient Response:
— <1µs Response to Short Circuit
Low 18µA Quiescent Current
1µA Max with Switches Off
Slew Rate Controlled
Thermal Shutdown
Fault Flags with 3ms Blanking
Under-Voltage Lockout
Temperature Range: -40°C to +85ºC
Available in TDFN33-12, SOP-8, TSSOP-8, or
MSOP-8 Package
Applications
•
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Hot Swap Supplies
Media Bay
Notebook Computer
PDA, Subnotebook
Peripheral Ports
USB Ports
Typical Application
AAT4670
INA
INB
EN
INA
INB
EN
GND
OUTA
OUTB
FAULTA
FAULTB
OUTA
OUTB
FAULTA
FAULTB
C
INA
1μF
GND
C
INB
1μF
C
OUTA
1μF
C
OUTB
1μF
GND
4670.2006.09.1.4
1
Dual-Input, Dual-Output Load Switch
Pin Descriptions
Pin #
TDFN
Other Pkgs
AAT4670
Symbol
OUTA
EN
FAULTA
FAULTB
GND
OUTB
INB
INA
Function
P-channel MOSFET drain channel A.
Active-low enable input (logic low turns the switches on).
Open drain output; signals over-current for OUTA and over-tempera-
ture condition.
Open drain output; signals over-current for OUTB and over-tempera-
ture condition.
Ground connection.
P-channel MOSFET drain channel B.
P-channel MOSFET source channel B.
P-channel MOSFET source channel A.
Exposed paddle (bottom); connect to ground as closely as possible to
the device.
1, 12
2
3
4
5
6, 7
8, 9
10, 11
EP
8
1
2
3
4
5
6
7
Pin Configuration
TDFN33-12
SOP-8
OUTA
EN
FAULTA
FAULTB
GND
OUTB
1
2
3
4
5
6
12
11
10
9
8
7
OUTA
INA
INA
INB
INB
OUTB
EN
FAULTA
FAULTB
GND
1
8
OUTA
INA
INB
OUTB
1
2
7
2
3
6
4
5
TSSOP-8
MSOP-8
EN
FAULTA
FAULTB
GND
1
2
3
4
8
7
6
5
OUTA
INA
INB
OUTB
EN
FAULTA
FAULTB
GND
1
8
OUTA
INA
INB
OUTB
1
2
7
2
3
6
4
5
2
4670.2006.09.1.4
Dual-Input, Dual-Output Load Switch
Absolute Maximum Ratings
1
T
A
= 25°C, unless otherwise noted.
Symbol
V
INA,B
V
OUTA,B
V
FAULTA,B
I
OUT
T
J
V
ESD
T
LEAD
AAT4670
Description
INA or INB to GND
OUTA or OUTB to GND
FAULTA or FAULTB to GND
Output Current
Operating Junction Temperature Range
ESD Rating
2
- HBM
Maximum Soldering Temperature (at Leads)
Value
-0.3 to 6
-0.3 to 6
-0.3 to 6
Internally Limited
-40 to 150
4000
300
Units
V
V
V
A
°C
V
°C
Thermal Characteristics
3
Symbol
Θ
JA
P
D
Description
Maximum Thermal Resistance
Maximum Power Dissipation
SOP-8
TDFN33-12
SOP-8
TDFN33-12
Value
100
50
1.25
2.0
Units
°C/W
W
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at condi-
tions 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.
4670.2006.09.1.4
3
Dual-Input, Dual-Output Load Switch
Electrical Characteristics
V
IN
= 5V, T
A
= 25°C, unless otherwise noted.
Bold
values designate -40°C to +85°C temperature range.
Symbol Description
V
IN
I
Q
I
Q(OFF)
I
SD(OFF)
V
UVLO
R
DS(ON)
T
CRDS
I
LIM
t
1
t
2
t
3
t
4
V
EN(L)
V
EN(H)
I
EN(SINK)
t
RESP
V
FAULTLOW
I
SINK
T
blank
T
SD
Operation Voltage
Quiescent Current
Off Supply Current
Off Switch Current
Under-Voltage Lockout
On-Resistance Channel
A or B
Switch Resistance
Temperature Coefficient
Current Limit Channel A or B
Output Turn-On Delay Time
Output Rise Time
Output Turn-Off Delay Time
Output Fall Time
EN Input Low Voltage
EN Input High Voltage
EN Input Leakage
Current Loop Response
FAULT Logic Output Low
FAULT Logic Output High
Leakage Current
Fault Blanking Time
Over-Temperature Threshold
AAT4670
Conditions
V
INA
or V
INB
= 5V I
OUTA
= I
OUTB
= 0
EN = V
IN
, V
INA
= V
INB
= 5V, OUTA, OUTB Open
EN = V
IN
, V
INA
= V
INB
= 5V, V
OUTA
= V
OUTB
= 0V
V
IN
= 5.0V
V
IN
= 3.0V
Min
2.2
Typ
18
0.1
1.7
95
105
2800
Max Units
5.5
40
1
1
2.2
130
150
V
µA
µA
µA
V
mΩ
ppm/°C
1.50
1000
1000
20
20
0.8
A
µs
µs
µs
µs
V
V
V
OUT
< V
IN
to 0.5V
V
IN
= 5V, OUT = 0 to 10%, R
LOAD
= 20Ω
V
IN
= 5V, OUT = 10% to 90%, R
LOAD
= 20Ω
V
IN
= 5V, OUT = 100% to 90%, R
LOAD
= 20Ω
V
IN
= 5V, OUT = 90% to 10%, R
LOAD
= 20Ω
V
IN
= 2.7V to 5.5V
1
V
IN
= 2.7V to < 3.6V
V
IN
= 3.6V to 5.5V
V
EN
= 5.5V
V
IN
= 5V
I
SINK
= 1mA
V
FAULT
= 5.5V
1.0
1.25
100
100
10
5
2.0
2.4
0.01
750
0.5
3
125
1
0.4
1
µA
ns
V
µA
ms
°C
1. For V
IN
outside this range, consult typical EN threshold curve.
4
4670.2006.09.1.4
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