AAT4681
20mΩ P-Ch SmartSwitch for UMPC Battery Charging ApplicationsSmartSwitchTM
PRODUCT DATASHEET
4681.2010.06.1.1 1
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General Description
The AAT4681 SmartS witch enables separ ate stand- alone
AC adapter and PMU USB chargers to independently con-
trol a single low RDS(ON) power MOSFET between battery
and system power output. A 20V version is available for
multi-cell Li-ion applications and a 6V version is av ailable
for single-cell Li-ion applications.
The two P-channel power MOSFETs required in UMPC
applications for controlling independent charger ICs can
be consolidated to a single device, saving space and
reducing cost. The single 20m P-channel device in the
AAT4681/-1 has four times lower R DS(ON) than the equiva-
lent path resistance formed by two series devices.
Ordering options are available for multi-cell and single-
cell Li-ion versions. For the single-cell application, a 6V
device with dual independent gate control is available.
For 2-cell and 3-cell applications a 20V ordinary P-channel
device is available in the same package and pin configu-
ration. Both devices are available in the TDFN-10L 3mm
x 3mm package.
Features
• Multi-Cell 20V Device and Single-Cell 6V Device
• Dual Independent Gate Controls
Independent Linear Regulator and SMPS Power
Switch States are Maintained
• 3mm x 3mm TDFN-10L package
• Temperature Range: -40°C to 85°C
Applications
• Smart Phones
• Sub Notebooks
Smartbooks
Netbooks
• Ultra-Mobile PCs
• Wireless Media Devices
Typical Application
GQ
GND
DS
GC
STAT
DS
G
20mΩ
Gate Control from
Stand-Alone Charger
Gate Control from
PMU USB Charger
Status
Output
Linear/Power-
Switch Gate Control
Linear Control
Detection
System
Power
R1
VIO
N/C
N/C
DS
GC
N/C
DS
G
Gate Control from
Stand-Alone Charger
System
Power
30mΩ
AAT4681, AAT4681-1 AAT4681-2
AAT4681
20mΩ P-Ch SmartSwitch for UMPC Battery Charging ApplicationsSmartSwitchTM
PRODUCT DATASHEET
2 4681.2010.06.1.1
www.analogictech.com
Pin Descriptions
Pin #
Pin Name
FunctionAAT4681/-1 AAT4681-2
1, 2, 3 S S Source connection.
4 GQ N/C Gate control from PMU charger.
5 GC GC Gate control from stand-alone charger.
6 STAT N/C Open drain status output. “STAT” signal “high” means QC is “on” and “STAT”
signal low means GQ is “on”
7 GND N/C Ground connection
8, 9, 10 D D Drain connection.
Pin Configuration
TDFN33-10L
(Top View)
AAT4681/-1 AAT4681-2
S
GC
GQ
S
S
D
STAT
GND
D
D
3
4
5
1
2
8
7
6
10
9
S
GC
N/C
S
S
D
N/C
N/C
D
D
3
4
5
1
2
8
7
6
10
9
AAT4681
20mΩ P-Ch SmartSwitch for UMPC Battery Charging ApplicationsSmartSwitchTM
PRODUCT DATASHEET
4681.2010.06.1.1 3
www.analogictech.com
1 Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.
2. Pulse width <300s, duty cycle <1%.
3. TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formula: TJ = TA + PD · JA.
4. Thermal Resistance is specified with approximately 1 square inch of 1 oz. copper.
Absolute Maximum Ratings1
Symbol Description Value Units
AAT4681, AAT4681-1
VD, VSDrain or Source Voltage to GND 6.0 V
VSTAT STAT to GND -0.3 to 6.0 V
ISTAT STAT Current 10 mA
VGC, VGQ Gate Voltage Levels to GND -0.3 to 6.0 V
IDContinuous Drain Current @ TA = 85°C AAT4681 ±7 A
AAT4681-1 ±5
IDM Pulsed Drain Current2±10 A
ISContinuous Source Current (Source-Drain Diode) -1.5 A
AAT4681-2
VDS Drain-Source Voltage -20 V
VGS Gate-Source Voltage ±12 V
IDContinuous Drain Current TA = 25°C ±4.0 A
TA = 70°C ±3.2 A
IDM Pulsed Drain Current ±24 A
ISContinuous Source Current (Source-Drain Diode) -1.5 A
Thermal Characteristics3
Symbol Description Value Units
TJOperating Junction Temperature Range -40 to +125 °C
TLEAD Maximum Soldering Temperature (at leads, 10 sec.) 300 °C
TDFN33-10L Thermal Impedance
JA Maximum Junction-to-Ambient Thermal Resistance 50 °C/W
PDMaximum Power Dissipation42W
AAT4681
20mΩ P-Ch SmartSwitch for UMPC Battery Charging ApplicationsSmartSwitchTM
PRODUCT DATASHEET
4 4681.2010.06.1.1
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1. Where VSYS is the greater of VD or VS.
2. Pulse width < 300s, duty cycle < 1%.
Electrical Characteristics
TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.
Symbol Description Conditions Min Typ Max Units
AAT4681/-1
VSYS Input Voltage Range11.8 5.5 V
VUVLO Under-Voltage Lockout For VSYS < VUVLO, GC active 1.4 V
IQQuiescent Current VD = 4.2V, TJ = 55°C 3.6 15 A
IDSS Drain-Source Leakage Current VGS = 0V, VDS = –5.5V, TJ = 55°C -5 A
RDS(on) P-Channel On Resistance2VD = VGC = 4.2V, VGQ = GND, ID = 5A,
TA = 25°C AAT4681 18 25 m
AAT4681-1 23 28
VHYS GQ-GC Transition Hysteresis 300 mV
tGSW GQ-GC Transition Delay Slew rate of QG @ 1ms 10 s
VSTATLOW STAT Logic Output Low ISTAT(SINK) = 1mA 0.025 0.4 V
ISTAT(SINK) STAT Logic High Leakage Current VSTAT = 5.5V, VGC = 5.5V, VGQ = GND 0.005 1 A
AAT4681-2
BVDSS Drain-Source Breakdown Voltage VGS = 0V, ID = -250A -20 V
RDS(ON) Drain-Source On-Resistance2VGS = -4.5V, ID = -4.0A 27 40 m
ID(ON) On-State Drain Current VGS = -4.5V, VDS = -5V (pulse)2-24 A
VGS(th) Gate Threshold Voltage VGS = VDS, ID = -250A -0.8 V
GQ – GC
Gate Drive
Voltage
GQ
GC
0V
VHYS
AAT4681
20mΩ P-Ch SmartSwitch for UMPC Battery Charging ApplicationsSmartSwitchTM
PRODUCT DATASHEET
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AAT4681/-1 Typical Electrical Characteristics
Hysteresis, GQ Ramp Time = 2.5ms
(S = 5.5V; GC = 0.5V; RSTAT = 5K; VIO = 5.5V)
Time (100μs/div)
Voltage (100mV/div)
GQ
GC
STAT
Hysteresis, GQ Ramp Time = 500μs
(S = 5.5V; GC = 0.5V; RSTAT = 5K; VIO = 5.5V)
Time (20μs/div)
Voltage (100mV/div)
GQ
GC
STAT
Timing
(S = 5.5V; GC = 0.5V; GQ ramp time = 2.5ms;
RSTAT = 5K; VIO = 5.5V)
Time (1ms/div)
Voltage (1V/div)
GQ
GC
STAT
Shutdown Current vs. Shutdown Voltage
VSD (V)
ISD (A)
0 0.1 0.2 0.3 0.4 0.5
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
VG = 0.85V
VG = 0.90V
VG = 0.95V
VG = 1V
VG = 1.05V
VG = 1.1V
VG = 1.2V
VG = 1.5V
VG = 2V
VG = 3V
VG = 4V
VG = 5V
VG = 6V
R
DS(ON)
vs. I
SD
ISD (A)
RDS(ON) (mΩ)
2 2.5 3 3.5 4 54.5
12
14
16
18
20
22
24
26
28 VG = 2V
VG = 3V
VG = 4V
VG = 5V
VG = 6V
On-Resistance vs. Junction Temperature
(VS = 6V; IDS = 5A; Pulse width <300μs; Duty Cycle < 1%)
TJ (°C)
Normalized RDS(ON) (mΩ)
-50 0 50 100-25 25 75 150125
0.60
0.80
1.00
1.20
1.40
1.60
1.80
AAT4681
20mΩ P-Ch SmartSwitch for UMPC Battery Charging ApplicationsSmartSwitchTM
PRODUCT DATASHEET
6 4681.2010.06.1.1
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AAT4681/-1 Typical Electrical Characteristics
On-Resistance vs. Gate Voltage GC
(VS = 6V; VGQ = 0V, IDS = 5A;
Pulse Width < 300μs, Duty Cycle < 1%)
VS - VGC (V)
RDS(ON) (mΩ)
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 65.5
10
15
20
25
30
35
40
45
50
On-Resistance vs. Gate Voltage GC
VS = 6V, VGC = 0V, IDS = 5A;
Pulse Width < 300μs, Duty Cycle < 1%)
VS - VGQ (V)
RDS(ON) (mΩ)
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 65.5
10
15
20
25
30
35
40
45
50
On-Resistance vs. Gate Voltage GC
VS = 6V, VGQ = 0V, IDS = 7A;
Pulse Width < 300μs, Duty Cycle < 1%)
VS - VGC (V)
RDS(ON) (mΩ)
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 65.5
10
15
20
25
30
35
40
45
50
On-Resistance vs. Gate Voltage GQ
VS = 6V, VGQ = 0V, IDS = 7A;
Pulse Width < 300μs, Duty Cycle < 1%)
VS - VGQ (V)
RDS(ON) (mΩ)
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 65.5
10
15
20
25
30
35
40
45
50
AAT4681
20mΩ P-Ch SmartSwitch for UMPC Battery Charging ApplicationsSmartSwitchTM
PRODUCT DATASHEET
4681.2010.06.1.1 7
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AAT4681-2 Typical Electrical Characteristics
Output Characteristics
-VDS (V)
-IDS (A)
0 0.5 1 1.5 2
VG = -1.5V
VG = -2V
VG = -2.5V
VG = -3V
VG = -3.5V
VG = -4V
VG = -4.5V
VG = -5V
VG = -6V
VG = -7V
VG = -8V
VG = -9V
VG = -10V
0
1
2
3
4
5
6
7
8
9
Transfer Characteristics
-VGS (V)
-ID (A)
01 2345
0
2
4
6
8
10
12
14
125°C
25°C
-50°C
On-Resistance vs. Drain Current
-ID (A)
RDS(ON) (Ω)
02 4 6 8
0
0.02
0.04
0.06
0.08
0.1
VG = -2.5V
VG = -4.5V
On-Resistance vs. Gate-Source Voltage
-VGS (V)
RDS(ON) (Ω)
0246810
0
0.02
0.04
0.06
0.08
0.1
On-Resistance vs. Junction Temperature
(VGS = -4.5V; ID = -5.9A)
TJ (°C)
Normalized RDS(ON) (mΩ)
-50 0 50 100-25 25 75 150125
0.60
0.80
1.00
1.20
1.40
1.60
1.80
Threshold Voltage vs. Junction Temperature
TJ (°C)
VGS(th) Variance (V)
-50 0 50 100-25 25 75 150125
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
AAT4681
20mΩ P-Ch SmartSwitch for UMPC Battery Charging ApplicationsSmartSwitchTM
PRODUCT DATASHEET
8 4681.2010.06.1.1
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AAT4681-2 Typical Electrical Characteristics
Gate Charge
-QG, Charge (nC)
-VGS (V)
02468101214161820222426
0
2
4
6
8
10
Source-Drain Diode Forward Voltage
VSD (V)
IS (A)
0 0.2 0.4 0.6 0.8 1.0 1.2
0.1
1
10
100
TJ = 150°C
TJ = 25°C
AAT4681
20mΩ P-Ch SmartSwitch for UMPC Battery Charging ApplicationsSmartSwitchTM
PRODUCT DATASHEET
4681.2010.06.1.1 9
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*Switch to GQ when GQ > GC even if QC is not equal to zero.
Functional Block Diagram
GQ
GND
DS
GC
STAT
SWB SW
Comp
UVLO
S
EN
S
SWBSW
GC
(Gate Control from
Stand-Alone Charger)
GQ
(Gate Control from
PMU USB Charger) P-Ch Gate Voltage Control Source
Vin Vin GC
Linear 0V GC
0V* Linear GQ
0V 0V GC
fl oat fl oat GC
AAT4681
20mΩ P-Ch SmartSwitch for UMPC Battery Charging ApplicationsSmartSwitchTM
PRODUCT DATASHEET
10 4681.2010.06.1.1
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Figure 1: AAT4681IDE Evaluation Board Figure 2: AAT4681IDE Evaluation Board
Top Side Layout. Bottom Side Layout
R1
S
1
S
2
D8
D10
D9
S
3
GQ
4GND 7
GC
5STAT 6
TDFN33-10L
U1 AAT4681IDE
GQ
SOURCE
GC Stat
GND
DRAIN
VIO
Figure 3: AAT4681IDE Evaluation Board Schematic.
AAT4681
20mΩ P-Ch SmartSwitch for UMPC Battery Charging ApplicationsSmartSwitchTM
PRODUCT DATASHEET
4681.2010.06.1.1 11
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1. XYY = assembly and date code.
2. Sample stock is generally held on part numbers listed in BOLD.
3. TA = 85°C.
4. TA = 70°C.
5. The leadless package family, which includes QFN, TQFN, DFN, TDFN and STDFN, has exposed copper (unplated) at the end of the lead terminals due to the manufacturing
process. A solder fillet at the exposed copper edge cannot be guaranteed and is not required to ensure a proper bottom solder connection.
Ordering Information
Package Marking1Continuous Drain Current (A) Part Number (Tape and Reel)2
TDFN33-10L J8XYY ±7.03AAT4681IDE-T1
TDFN33-10L F5XYY ±5.03AAT4681IDE-1-T1
TDFN33-10L ABXYY ±3.24AAT4681IDE-2-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/aboutus/quality.php.
Package Information
TDFN33-10L5
Top View
3.00
±
0.05
3.00
±
0.05
Pin 1 dot by marking
Pin 1 identification
R0.200
Bottom View
1.70
±
0.05
0.500 BSC0.23
±
0.05
0.40
±
0.05
2.40
±
0.05
Side View
0.05
±
0.05
0.203 REF
0.75
±
0.05
All dimensions in millimeters.
AAT4681
20mΩ P-Ch SmartSwitch for UMPC Battery Charging ApplicationsSmartSwitchTM
PRODUCT DATASHEET
12 4681.2010.06.1.1
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Phone (408) 737-4600
Fax (408) 737-4611
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Revision History
Date Revision Edits
5/20/2010 4681.2010.05.1.1 1. edits to Description p.1.
2. edits to Features p.1.
3. edits to Typical Application drawing labels and MOSFET orientation p.1.
