AOZ1331DI
Dual Channel Smart Load Switch
General Description
Features
The AOZ1331DI is a dual channel load switch with
typical 20mΩ on-resistance in a small package. It contains
two n-channel MOSFETs for up to 5.5V input voltage
operation and 6A current each channel with 2.5V to 5V
bias supply. Each load switch is independently controlled
by a low voltage control signal through ON1/ON2 pin.
0.8V to 5.5V input voltage range
6A continuous current per channel
Low RDS(ON) internal NFETs
The AOZ1331DI integrates an internal 220Ω load
resistor in each channel for quick output discharge when
load switch is off. The optional external capacitor
connected CT1/CT2 for output slew rate control.
The AOZ1331DI is available in a 3mm x 2mm DFN-14L
package with bottom thermal pad and is rated over a
-40°C to +85°C ambient temperature range.
– 20mΩ at VBIAS = 2.5V to 5V & VBIAS > VIN
Low quiescent current
– 80µA (both channels)
– 60µA (single channel)
Adjustable rise time
2.5V to 5V bias voltage
Integrated quick output discharge resistor
Thermally enhanced 3mm x 2mm DFN-14L package
Applications
Portable computers
Ultrabooks
Tablet PC
Set top boxes
LCD TVs
Telecom/Networking/Datacom
equipment
SSD
Consumer electronics
Typical Application
VIN1
IN1
VOUT1
OUT1
CIN1
CL1
ON
ON1
OFF
CT1
AOZ1331DI
VBIAS
CT1
GND
CT2
ON
ON2
CT2
OFF
IN2
VIN2
Rev. 1.0 January 2014
VOUT2
OUT2
CIN1
CL2
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Page 1 of 14
AOZ1331DI
Ordering Information
Part Number
Temperature Range
Package
Environmental
AOZ1331DI
-40°C to +85°C
3mm x 2mm DFN-14L
Green
All AOS products are offered in packages with Pb-free plating and compliant to RoHS standards.
Please visit www.aosmd.com/media/AOSGreenPolicy.pdf for additional information.
Pin Configuration
IN1
1
14
OUT1
IN1
2
13
OUT1
ON1
3
12
CT1
VBIAS
4
11
GND
ON2
5
10
CT2
IN2
6
IN2
7
EPAD
9
OUT2
8
OUT2
3mm x 2mm DFN-14
(Top View)
Pin Description
Pin Number
Pin Name
1, 2
IN1
Switch 1 Input. Bypass capacitor is recommended to minimize input voltage dip.
Recommended voltage range of this pin is 0.8V to VBIAS to obtain optimal RON.
3
ON1
Enable Input of Switch 1. Switch 1 is on when ON1 is pulled high, and is off when ON1 is
pulled low. Do not leave floating.
4
VBIAS
Bias Voltage. Power supply to this device. Recommended voltage range is 2.5V to 5.5V.
5
ON2
Enable Input of Switch 2. Switch 2 is on when ON2 is pulled high, and is off when ON2 is
pulled low. Do not leave floating.
6, 7
IN2
Switch 2 Input. Bypass capacitor is recommended to minimize input voltage dip.
Recommended voltage range of this pin is 0.8V to VBIAS to obtain optimal RON.
8, 9
OUT2
10
CT2
Slew rate control of switch 2.
11
GND
Ground.
Slew rate control of switch 1.
12
CT1
13, 14
OUT1
EPAD
Exposed Pad
Rev. 1.0 January 2014
Pin Function
Switch 2 Output.
Switch 1 Output.
The exposed bottom pad must be connected to GND.
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Page 2 of 14
AOZ1331DI
Functional Block Diagram
IN1
CT1
ON1
VBIAS
ON2
Typical Performance Characteristics
Control
Logic
Timing Diagram
OUT1
Charge Pump
GND
Control
Logic
OUT2
CT2
IN2
Rev. 1.0 January 2014
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Page 3 of 14
AOZ1331DI
Absolute Maximum Ratings
Recommend Operating Ratings
Exceeding the Absolute Maximum ratings may damage the
device.
The device is not guaranteed to operate beyond the Maximum
Operating Ratings.
Parameter
Rating
Parameter
IN1, IN2, VBIAS, ON1, ON2 to GND
-0.3V to 6V
OUT1, OUT2 to GND
-0.3V to 6V
Junction Temperature (TJ)
+150°C
Storage Temperature (TS)
-65°C to +150°C
ESD Rating HBM/CDM
2kV/1kV
Rating
Supply Voltage (VIN)
5.5V
Ambient Temperature (TA)
-40°C to +85°C
Package Thermal Resistance
3x2 DFN-14 (JC)
3x2 DFN-14 (JA)
10°C/W
65°C/W
Electrical Characteristics
TA = 25°C, VBIAS = 5V, unless otherwise specified. Specifications in BOLD indicate a temperature range of -40°C to +85°C.
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Units
VINX
IN Supply Voltage
0.8
VBIAS
V
VBIAS
VBIAS Supply Voltage
2.5
5.5
V
ID1, 2
Maximum Continuous Current
VINX = VONX = 5V
6
A
Maximum Pulsed Switch Current
VINX = VONX = 5V
Pulse < 300µs, 2% Duty Cycle
8
A
Iq2
Quiescent Supply Current of VBIAS
(Two Channels)
IOUT1 = IOUT2 = 0V,
VIN1,2 = VON1,2 = 5V
80
Iq1
Quiescent Supply Current of VBIAS
(Single Channel)
IOUT1 = IOUT2 = 0V,
VIN1,2 = VON1 = 5V, VON2 = 0V
60
VBIAS Shutdown Supply Current
VON1,2 = 0V, VOUT1,2 = 0V
1
2
VONX = 0V, VOUTX = 0V,
VINX = 5V
2.1
8
VONX = 0V, VOUTX = 0V,
VINX = 3.3V
0.3
3
VONX = 0V, VOUTX = 0V,
VINX = 1.8V
0.07
2
VONX = 0V, VOUTX = 0V,
VINX = 0.8V
0.04
1
IPLS1, 2
IOFF
IINOFF
ION1, 2
IN1, IN2 Shutdown Supply Current
(Single Channel)
ON1, 2 Leakage Current
VON1,2 = 5V
VONH1, 2
ON1, 2 High Level Voltage
VINX = 0.8V to 5V
VONL1, 2
ON1, 2 Low Level Voltage
VINX = 0.8V to 5V
120
µA
µA
1
1.2
µA
µA
µA
V
0.5
V
Switching ON Resistance
RON
Switch ON-State Resistance
IOUTX = -200mA
VINX = 0.8V to 5V
20
30
mΩ
RPD
Output Pull-Down Resistance
IOUTX = 15mA
VINX = 5V, VONX = 0V
220
300
Ω
Note:
Greater on-resistance if VIN > VBIAS.
Rev. 1.0 January 2014
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Page 4 of 14
AOZ1331DI
Switching Characteristics
VON
50%
50% t
OFF
tON
90%
VOUT
90%
tD-ON
50%
50%
10%
1%
tR
10%
tF
Test conditions: TA = 25°C, CINX = 1µF, CTX = 1nF, CLX = 0.1µF, RLX = 10Ω (unless otherwise specified).
Symbol
Parameter
Min.
Typ.
Max.
Units
VINX = 5V, VBIAS = VONX = 5V
tON
Turn-ON Time
1475
tD-ON
Turn-ON Delay time
370
tR
Turn-ON Rise Time
1875
tOFF
tF
Turn-OFF Time
5.8
Turn-OFF Fall Time
2.8
µs
VINX = 0.8V, VBIAS = VONX = 5V
Turn-ON Time
560
tD-ON
Turn-ON Delay time
350
tR
Turn-ON Rise Time
338
Turn-OFF Time
158
Turn-OFF Fall Time
20
tON
tOFF
tF
µs
VINX = 2.5V, VBIAS = VONX = 2.5V
tON
Turn-ON Time
2050
tD-ON
Turn-ON Delay time
700
tR
Turn-ON Rise Time
2150
tOFF
tF
Turn-OFF Time
µs
6.5
Turn-OFF Fall Time
2
VINX = 0.8V, VBIAS = VONX = 2.5V
Turn-ON Time
1230
tD-ON
Turn-ON Delay time
650
tR
Turn-ON Rise Time
730
Turn-OFF Time
135
Turn-OFF Fall Time
16
tON
tOFF
tF
Rev. 1.0 January 2014
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µs
Page 5 of 14
AOZ1331DI
Typical Characteristics
Quiescent Current vs. VBIAS (Single Channel)
(VBIAS=5.5V, IOUT=-200mA)
27
-40ºC
70
25ºC
70ºC
80ºC
25
RDSON (mΩ)
60
IBIAS (μA)
RSDON vs. VIN
(VIN=VBIAS, VON1=5V, VON2=0V)
80
50
40
30
23
21
-40ºC
25ºC
70ºC
80ºC
19
20
17
10
0
15
2.5
2.8
3.0
3.3
3.5
3.8 4.0 4.3
VBIAS (V)
4.5
4.8
5.0
0.8
5.3 5.5
1.3
1.8
2.3
Quiescent Current vs. VBIAS (Both Channels)
80
70
4.3
4.8
5.3
5.8
4.3
4.8
5.3
5.8
(VBIAS=5.5V)
228
-40ºC
226
25ºC
70ºC
80ºC
224
222
RPD (Ω)
60
IBIAS (μA)
3.3
3.8
VIN (V)
RPD vs. VIN
(VIN=VBIAS, VON1=5V, VON2=5V)
90
2.8
50
40
-40ºC
220
25ºC
70ºC
80ºC
218
30
216
20
214
10
212
210
0
2.5
2.8
3.0
29
3.3
3.5
3.8 4.0 4.3
VBIAS (V)
4.5
4.8
5.0
0.8
5.3 5.5
1.3
1.8
2.3
2.8
3.3
3.8
VIN (V)
RDSON vs. VIN
VOUT vs. VON
(VBIAS=2.5V, IOUT=-200mA)
(TA=25ºC, VIN=2V)
2.5
27
2.0
VOUT (V)
RDSON (mΩ)
25
23
21
-40ºC
25ºC
70ºC
80ºC
19
1.5
1.0
VBIAS = 2.5V
VBIAS = 3.3V
VBIAS = 5.0V
VBIAS = 5.5V
0.5
17
15
0
0.8
1.1
Rev. 1.0 January 2014
1.4
1.7
VIN (V)
2.0
2.3
2.6
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0.5
0.7
0.9
VON (V)
1.1
1.3
Page 6 of 14
AOZ1331DI
Typical Characteristics (Continued)
tON vs. VIN
tD-ON vs. VIN
(VBIAS=2.5V)
3000
(VBIAS=5.5V)
500
450
2500
400
350
tD-ON (μs)
tON (μs)
2000
1500
1000
300
250
200
150
-40ºC
-40ºC
100
25ºC
70ºC
80ºC
500
25ºC
70ºC
80ºC
50
0
0
0.8
1.0
1.2
1.4
1.6
1.8
VIN (V)
2.0
2.2
2.4
0.8
2.6
1.2
1.6
2.0
2.4
tON vs. VIN
3.2 3.6
VIN (V)
4.0
4.4
4.8
5.2 5.6
tR vs. VIN
(VBIAS=5.5V)
2000
2.8
(VBIAS=2.5V)
3000
1800
2500
1600
2000
1200
tR (μs)
tON (μs)
1400
1000
1500
800
1000
600
-40ºC
-40ºC
400
25ºC
70ºC
80ºC
200
25ºC
70ºC
80ºC
500
0
0
0.8
1.2
1.6
2.0
2.4
1200
2.8 3.2 3.6
VIN (V)
4.0
4.4
4.8
0.8
5.2 5.6
1.0
1.2
1.4
1.6
1.8
VIN (V)
tD-ON vs. VIN
tR vs. VIN)
(VBIAS=2.5V)
(VBIAS=5.5V)
2500
1000
2.0
2.2
2.4
2.6
2000
tR (μs)
tD-ON (μs)
800
600
1500
1000
400
-40ºC
-40ºC
200
25ºC
70ºC
80ºC
500
25ºC
70ºC
80ºC
0
0
0.8
1.0
1.2
Rev. 1.0 January 2014
1.4
1.6
1.8
VIN (V)
2.0
2.2
2.4
2.6
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0.8
1.2
1.6
2.0
2.4
2.8 3.2 3.6
VIN (V)
4.0
4.4
4.8
5.2 5.6
Page 7 of 14
AOZ1331DI
Typical Characteristics (Continued)
tOFF vs. VIN
tOFF vs. VIN
(VBIAS=2.5V)
160
140
120
-40ºC
160
-40ºC
25ºC
70ºC
80ºC
140
25ºC
70ºC
80ºC
120
100
tOFF (μs)
tOFF (μs)
(VBIAS=5.5V)
180
80
60
100
80
60
40
40
20
20
0
0
0.8
1.0
1.2
1.4
1.6
1.8
VIN (V)
2.0
2.2
2.4
0.8
2.6
1.2
1.6
2.0
2.4
tF vs. VIN
4.0
4.4
4.8
(VBIAS=5.5V)
25
-40ºC
-40ºC
25ºC
70ºC
80ºC
20
25ºC
70ºC
80ºC
20
15
15
tF (μs)
tF (μs)
5.2 5.6
tF vs. VIN
(VBIAS=2.5V)
25
2.8 3.2 3.6
VIN (V)
10
10
5
5
0
0
0.8
1.0
1.2
Rev. 1.0 January 2014
1.4
1.6
1.8
VIN (V)
2.0
2.2
2.4
2.6
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0.8
1.2
1.6
2.0
2.4
2.8 3.2 3.6
VIN (V)
4.0
4.4
4.8
5.2 5.6
Page 8 of 14
AOZ1331DI
Functional Characteristics
Turn-ON & Turn-ON Rise Times
Turn-ON & Turn-ON Rise Times
(VINX=0.8V, VBIAS=5V, CINX=1μF, CTX=1nF, CLX=0.1μF, RLX=10Ω)
(VINX=5V, VBIAS=5V, CINX=1μF, CTX=1nF, CLX=0.1μF, RLX=10Ω)
VON1
(5V/div)
VON1
(5V/div)
VOUT1
(2V/div)
VOUT1
(500mV/div)
VON2
(5V/div)
VON2
(5V/div)
VOUT2
(2V/div)
VOUT2
(500mV/div)
Turn-ON & Turn-ON Rise Times
Turn-ON & Turn-ON Rise Times
(VINX=0.8V, VBIAS=2.5V, CINX=1μF, CTX=1nF, CLX=0.1μF, RLX=10Ω)
(VINX=2.5V, VBIAS=2.5V, CINX=1μF, CTX=1nF, CLX=0.1μF, RLX=10Ω)
VON1
(5V/div)
VON1
(5V/div)
VOUT1
(1V/div)
VOUT1
(500mV/div)
VON2
(5V/div)
VOUT2
(1V/div)
VON2
(5V/div)
VOUT2
(500mV/div)
Turn-OFF & Turn-OFF Fall Times
Turn-OFF & Turn-OFF Fall Times
(VINX=0.8V, VBIAS=5V, CINX=1μF, CTX=1nF, CLX=0.1μF, RLX=10Ω)
(VINX=5V, VBIAS=5V, CINX=1μF, CTX=1nF, CLX=0.1μF, RLX=10Ω)
VON1
(5V/div)
VON1
(5V/div)
VOUT1
(2V/div)
VOUT1
(500mV/div)
VON2
(5V/div)
VOUT2
(2V/div)
Rev. 1.0 January 2014
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VON2
(5V/div)
VOUT2
(500mV/div)
Page 9 of 14
AOZ1331DI
Functional Characteristics (Continued)
Turn-OFF & Turn-OFF Fall Times
Turn-OFF & Turn-OFF Fall Times
(VINX=0.8V, VBIAS=2.5V, CINX=1μF, CTX=1nF, CLX=0.1μF, RLX=10Ω)
(VINX=2.5V, VBIAS=2.5V, CINX=1μF, CTX=1nF, CLX=0.1μF, RLX=10Ω)
VON1
(5V/div)
VON1
(5V/div)
VOUT1
(500mV/div)
VOUT1
(1V/div)
VON2
(5V/div)
VON2
(5V/div)
VOUT2
(1V/div)
VOUT2
(500mV/div)
Turn-ON & Turn-OFF @ IOUT = 6A
Turn-ON & Turn-OFF @ IOUT = 6A
(VIN1=2.5V, VBIAS=5V, CIN1=4.7μF, CL1=4.7μF)
(VIN1=5V, VBIAS=5V, CIN1=4.7μF, CL1=4.7μF)
Rev. 1.0 January 2014
VON
(5V/div)
VON
(5V/div)
VOUT
(2V/div)
VOUT
(1V/div)
IOUT
(2A/div)
IOUT
(2A/div)
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Page 10 of 14
AOZ1331DI
Detailed Description
Applications Information
ON/OFF Control
The basic AOZ1331DI application circuit is shown in the
first page. Component selection is explained below.
The AOZ1331DI is enabled when the ON pin is on active
high with 1.2V or above voltage. The device is disabled
when the ON pin voltage is 0.5V or lower. The EN input is
compatible with both TTL and CMOS logic.
VBIAS Voltage Range
For optimal on-resistance of load switch, make sure VIN ≤
VBIAS and VBIAS is within the voltage range from 2.5V to
5.5V. On-resistance of load switch will be higher if VIN >
VBIAS. Resistance curves of a typical sample device at
different VBIAS and different VIN are shown as below.
55
VBIAS = 2.5V
50
VBIAS = 3.3V
VBIAS = 3.6V
VBIAS = 4.2V
VBIAS = 5.0V
VBIAS = 5.5V
RDSON (mΩ)
45
40
Input Capacitor Selection
A capacitor of 1μF or higher value is recommended to be
place close to the IN pins of AOZ1331DI. This capacitor
can reduce the voltage drop caused by the in-rush
current during the turn-on transient of the load switch. A
higher value capacitor can be used to further reduce the
voltage drop during high-current application.
Output Capacitor Selection
A capacitor of 0.1μF or higher value is recommended to
be place between the OUT pins and GND. The switching
times are affected by the capacitance. A larger capacitor
makes the initial turn-on transient smoother. This capacitor must be large enough to supply a fast transient load in
order to prevent the output from dropping.
Thermal Considerations
To ensure proper operation, the maximum junction temperature of the AOZ1331DI should not exceed 150°C.
Several factors attribute to the junction temperate rise:
load current, MOSFET on-resistance, junction-to-ambient thermal resistance, and ambient temperature. The
maximum load current can be determined by:
35
30
25
20
15
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
VIN (V)
I LOAD MAX =
Adjustable Rise Time
The slew rate of each channel can be adjusted individually by external capacitors connected to the corresponding CT and GND pins. Multiply the input voltage and the
slew rate to obtain the rise time. The table below shows
rise times, which are measured on a typical device at
VBIAS = 5V.
CTX
(pF)
Rise Time (µs) 10%~90%, CLX=0.1µF, CINX=1µF, RLX=10Ω (Typical
values at 25°C, 25V X7R 10% Ceramic Cap)
VINX=5V
3.3V
1.8V
1.5V
1.2V
1.05V
0.8V
0
85
68
49
45
40
37
34
220
431
297
172
147
122
106
89
470
888
583
332
269
218
189
161
1000
1700
1130
657
550
446
390
316
2200
3805
2534
1347
1152
966
867
701
4700
8053
5255
1997
2578
2101
1838
1483
10000
18330
12050
5545
5545
4155
4155
3329
Rev. 1.0 January 2014
T J MAX – T C
---------------------------------- JC R DSON
It is noted that the maximum continuous load current is
6A.
Layout Guidelines
Good PCB is important for improving the thermal performance of AOZ1331DI. Place the input and output bypass
capacitors close to the IN and OUT pins. The input and
output PCB traces should be as wide as possible for the
given PCB space. Use a ground plane to enhance the
power dissipation capability of the device.
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Page 11 of 14
AOZ1331DI
Package Dimensions, DFN3x2A_14L, EP1_S
D1
D
b(6x)
8
14
C45x0.20
E
E1
L(14x)
Pin #1 Dot
By Marking
L1(4x)
TOP VIEW
7
b1(4x)
e
b2(4x)
SIDE VIEW
1
A1
A2
BOTTOM VIEW
A
SIDE VIEW
0.30(4x)
0.50(14x)
2.60
0.90
2.30
0.20(2x)
RECOMMENDED LAND PATTERN
0.40
Dimensions in millimeters
Symbols
A
A1
A2
E
E1
D
D1
L
L1
b
b1
b2
e
Min.
0.70
0.00
1.90
0.80
2.90
2.40
0.30
0.15
0.15
0.15
0.55
Typ.
0.75
--0.2 REF
2.00
0.90
3.00
2.50
0.35
0.20
0.20
0.20
0.60
0.40 BSC
Max.
0.80
0.05
2.10
1.00
3.10
2.60
0.40
0.25
0.25
0.25
0.65
Dimensions in inches
Symbols
A
A1
A2
E
E1
D
D1
L
L1
b
b1
b2
e
Min.
0.028
0.000
Typ.
0.030
--0.008 REF
0.075 0.079
0.031 0.035
0.114 0.118
0.094 0.098
0.012 0.014
0.006 0.008
0.006 0.008
0.006 0.008
0.022 0.024
0.016 BSC
Max.
0.031
0.002
0.083
0.039
0.122
0.102
0.016
0.010
0.010
0.010
0.026
0.20(14x)
Unit: mm
Notes:
1. Controlling dimensions are in millimeters. Converted inch dimensions are not necessarily exact.
2. Tolerance is ±0.05, unless otherwise specified.
3. Radius on all corners is 0.152 (max), unless otherwise specified.
4. Package wrapage is 0.012 (max).
5. No plastic flash allowed on the top or bottom lead surface.
6. Pad planarity is ±0.102.
7. Crack between plastic body and lead is not allowed.
Rev. 1.0 January 2014
www.aosmd.com
Page 12 of 14
AOZ1331DI
Tape and Reel Dimensions, DFN3x2A_14L, EP1_S
Carrier Tape
P2
A
P1
A-A
D1
D0
E1
K0
E2
P0
T
A0
B0
E
A
Feeding Direction
UNIT: MM
Package
A0
B0
K0
D0
D1
E
E1
E2
P0
P1
P2
T
PIC DFN3x2
2.20
±0.10
3.20
±0.10
1.03
±0.10
1.50
+0.10
-0.0
1.00
+0.25
-0.0
8.00
+0.30
-0.1
1.75
±0.10
3.50
±0.05
4.00
±0.10
4.00
±0.10
2.00
±0.05
0.23
±0.02
Reel
W1
R
S
K
M
N
H
UNIT: MM
Tape Size
Reel Size
8mm
Ø180
M
Ø180.00
±0.50
N
W1
H
S
K
R
60.00
±0.50
8.40
+1.50
-0.0
13.00
±0.20
1.50
MIN.
13.50
MIN.
3.00
±0.50
Leader/Trailer and Orientation
Unit Per Reel:
3000pcs
Trailer Tape
300mm min.
Rev. 1.0 January 2014
Components Tape
Orientation in Pocket
www.aosmd.com
Leader Tape
500mm min.
Page 13 of 14
AOZ1331DI
Package Marking
AOZ1331DI
(DFN3x2-14)
A Y XX
Part Number Code
Y W LT
Week & Year Code
Assembly Location Code
Option Code
Assembly Lot Code
LEGAL DISCLAIMER
Applications or uses as critical components in life support devices or systems are not authorized. AOS does not
assume any liability arising out of such applications or uses of its products. AOS reserves the right to make
changes to product specifications without notice. It is the responsibility of the customer to evaluate suitability of the
product for their intended application. Customer shall comply with applicable legal requirements, including all
applicable export control rules, regulations and limitations.
AOS' products are provided subject to AOS' terms and conditions of sale which are set forth at:
http://www.aosmd.com/terms_and_conditions_of_sale
LIFE SUPPORT POLICY
ALPHA AND OMEGA SEMICONDUCTOR PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL
COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS.
As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant into
the body or (b) support or sustain life, and (c) whose
failure to perform when properly used in accordance
with instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of
the user.
Rev. 1.0 January 2014
2. A critical component in any component of a life
support, device, or system whose failure to perform can
be reasonably expected to cause the failure of the life
support device or system, or to affect its safety or
effectiveness.
www.aosmd.com
Page 14 of 14
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