AOZ1360
28V Programmable Current-Limited Load Switch
General Description
Features
The AOZ1360 is a member of Alpha and Omega
Semiconductor’s high-side load switch family intended
for applications that require circuit protection. The device
operates from a source voltage between 5.5V and 28V.
The internal current limiting circuit protects the input
supply voltage from large current load. The current limit
can be set with an external resistor. The AOZ1360
provides thermal protection function that limits excessive
power dissipation. The device employs internal soft-start
circuitry to control in-rush current due to highly capacitive
loads associated with hot-plug events. It features low
quiescent current of 220 µA and the supply current
reduces to less than 1 µA at shutdown.
35m maximum on resistance
The AOZ1360 is available in either an SO-8 or a
DFN-10 4 mm x 4 mm package which can operate over
a -40C to +85C temperature range.
Hot swap supplies
Programmable current limit
5.5V to 28V operating input voltage
Low quiescent current
Under-voltage lockout
Thermal shutdown protection
2.5kV ESD rating
Available in SO-8 or DFN-10 package
Applications
Notebook PCs
Typical Application
VIN
IN
C1
1μF
C2
1μF
AOZ1360
OFF ON
C3
1nF
Rev. 2.0 January 2015
VOUT
OUT
EN
SET
SS
GND
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R1
84.5k
Page 1 of 16
AOZ1360
Ordering Information
Part Number
Package
AOZ1360AIL
SO-8
AOZ1360DIL
DFN-10 4x4
Temperature Range
Environmental
-40 °C to +85 °C
Green Product
AOS Green Products use reduced levels of Halogens, and are also RoHS compliant.
Please visit www.aosmd.com/media/AOSGreenPolicy.pdf for additional information.
Pin Configuration
IN
1
8
OUT
IN
2
7
OUT
GND
3
6
SET
SS
4
5
EN
IN
IN
NC
GND
SS
10
1
2
OUT
8
3
4
5
9
GND
SO-8
DFN-10
(Top View)
(Top View)
7
6
OUT
OUT
NC
SET
EN
Pin Description
Pin Number
Pin Name
SO-8
DFN 4x4 10L
Pin Function
IN
1, 2
1, 2
GND
3
4
Ground.
SS
4
5
Soft-Start Pin. Connect a capacitor from SS to GND to set the soft-start time.
Connect SS to IN to set to the default soft-start time of 100us.
EN
5
6
Enable Input.
SET
6
7
Current Limit Set Pin. Connect a resistor from SET to GND to set the switch
current limit.
NC
OUT
7, 8
Rev. 2.0 January 2015
P-channel MOSFET source. Connect a 1 µF capacitor from IN to GND.
3, 8
No Connect
9, 10
P-channel MOSFET Drain. Connect a capacitor with 0.1 µF or above from OUT
to GND.
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Page 2 of 16
AOZ1360
Functional Block Diagram
OUT
IN
C1
1μF
C2
1μF
Gate Driver &
Slew Rate
Control
5V Linear
Regulator
Current Limit
SET
R1
84.5kΩ
5.5V
SS
UVLO
Comparator
Thermal
Shutdown
EN
C3
1nF
AOZ1360
Figure 1. Functional Block Diagram
Timing Diagram
VIH
EN
VIL
90%
90%
10%
OUT
TD(ON)
TD(OFF)
TR
Figure 2. AOZ1360 Timing Diagram
Absolute Maximum Ratings
Recommended Operating Conditions
Exceeding the Absolute Maximum Ratings may damage the
device.
The device is not guaranteed to operate beyond the maximum
Recommended Operating Conditions.
Parameter
IN to GND
EN, OUT to GND
SS, SET
Maximum Junction Temperature (TJ)
ESD Rating (Human Body Model)
Rev. 2.0 January 2015
Rating
Parameter
-0.3 V to +30 V
-0.3 V to VIN + 0.3 V
-0.3 V to +6 V
+150 °C
Junction Temperature (TJ)
Thermal Resistance
SO-8 (JA)
DFN-10 (JA)
Rating
-40 °C to +125 °C
82 °C/W
63 °C/W
2.5 kV
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Page 3 of 16
AOZ1360
Electrical Characteristics
VIN = 12V, TA = 25°C unless otherwise stated.
Symbol
Parameter
VIN
Input Supply Voltage
VUVLO
Undervoltage Lockout
Threshold
VUVHYS
Undervoltage Lockout
Hysteresis
Conditions
Min.
Typ.
5.5
IN rising
4.9
Max
Units
28
V
5.4
V
400
mV
400
A
EN = GND, no load
1
A
Output Leakage Current
EN = GND, no load
1
A
RDS(ON)
Switch On Resistance
AOZ1360AI VIN = 12 V
22
35
m
RDS(ON)
Switch On Resistance
AOZ1360AI VIN = 5.5 V
33
43
m
Current Limit
RSET = 84.5 k
2.7
3.4
A
0.8
V
IIN_ON
Input Quiescent Current
EN = IN, no load
IIN_OFF
Input Shutdown Current
ILEAK
ILIM
VEN_L
Enable Input Low Voltage
VEN_H
Enable Input High Voltage
VEN_HYS
Enable Input Hysteresis
IEN_BIAS
Enable Input Bias Current
Td_on
tON
220
2
2.0
V
100
mV
1
A
Turn-On Delay Time
EN_50% to OUT_10%
RL = 120 , CL = 1 F, SS = Floated
220
s
Turn-On Rise Time
OUT_10% to 90%
RL = 120 , CL = 1 F, SS = Floated
280
s
RL = 120 , CL = 1 F, CSS = 1 nF
360
RL = 120 , CL = 1 F, SS = Floated
280
s
tOFF
Turn-Off Fall Time
TSD
Thermal Shutdown Threshold
130
C
TSD_HYS
Thermal Shutdown Hysteresis
30
C
Rev. 2.0 January 2015
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Page 4 of 16
AOZ1360
Typical Performance Characteristics
Input Quiescent Current
Input Shutdown Current
1.0
290
0.9
0.8
250
Supply Current (μA)
Supply Current (μA)
270
230
85°C
25°C
-40°C
210
190
0.6
0.5
85°C
25°C
-40°C
0.4
0.3
0.2
170
150
0.7
0.1
5
10
15
20
25
0
30
5
10
15
VIN (V)
Output Leakage Current
25
30
UVLO Threshold vs. Temperature
4.8
1.0
VIN = 12V
VIN = 5.5V
0.9
0.8
4.7
0.7
Threshold (V)
Output Leakage Current (μA)
20
VIN (V)
0.6
0.5
0.4
0.3
0.2
4.6
Rising
Falling
4.5
4.4
4.3
0.1
0
-50
-30
-10
10
30
50
Temperature (°C)
70
4.2
90
-60
-40
-20
RDS(ON) vs. Supply Voltage
40
30
35
80
100
120
30
RDS(ON) (mΩ)
25
RDS(ON) (mΩ)
20
40
60
Temperature (°C)
RDS(ON) vs. Temperature
35
20
15
10
25
VIN = 12V
VIN = 5.5V
20
15
10
5
0
-50
0
5
-30
Rev. 2.0 January 2015
-10
10
30
VIN (V)
50
70
90
0
-60
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-40
-20
0
20
40
60
Temperature (°C)
80
100
120
Page 5 of 16
AOZ1360
Typical Performance Characteristics (Continued)
Enable Input Threshold (Rising) vs. Temperature
Enable Input Threshold (Falling) vs. Temperature
1.8
1.8
VIN = 12V
VIN = 5.5V
1.4
1.4
1.2
1.2
1.0
0.8
1.0
0.8
0.6
0.6
0.4
0.4
0.2
0.2
0
-60
-40
-20
0
20
40
60
80
VIN = 12V
VIN = 5.5V
1.6
VEN (V)
VEN (V)
1.6
100
0
120
-60
-40
-20
0
Temperature (°C)
Current Derating Curve for SO8
60
80
100
120
Current Derating Curve for DFN-10 4x4
6.3
6.5
6.1
6.0
5.9
5.5
Current (A)
Current (A)
40
6.5
7.0
5.0
4.5
5.7
5.5
5.3
5.1
4.0
4.9
3.5
3.0
20
Temperature (°C)
4.7
0
10
20
30
40
50
60
70
80
4.5
-40
90
-20
Ambient Temperature (°C)
0
20
40
60
80
100
Ambient Temperature (°C)
Internal Power MOSFET SOA
100.0
10ms
- I D (Amps)
10.0
100 m
R DS(ON)
limited
1ms
1.0
0.1
TJ(Max) =150e
C
10s
C
TA =25e
DC
0.0
0.01
0.1
1
10
100
- V DS(Volts)
Rev. 2.0 January 2015
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Page 6 of 16
AOZ1360
Typical Performance Characteristics (Continued)
Turn-On
Turn-Off
(VIN = 12V, R = 5.6Ω)
(VIN = 12V, R = 5.6Ω)
VIN
2V/div
VIN
2V/div
VOUT
2V/div
VOUT
2V/div
EN
1V/div
EN
1V/div
IOUT
0.5A/div
IOUT
0.5A/div
1ms/div
20μs/div
Current Limit
Over Temperature
(VIN = 12V, R = 3.6Ω)
(VIN = 12V, R = 3.6Ω)
VIN
5V/div
VIN
2V/div
VOUT
2V/div
VOUT
2V/div
EN
1V/div
EN
1V/div
IOUT
0.5A/div
IOUT
0.5A/div
5ms/div
Rev. 2.0 January 2015
100ms/div
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Page 7 of 16
AOZ1360
Detailed Description
Introduction
The AOZ1360 is a 35 m P-channel high-side load
switch with adjustable soft-start slew-rate control,
programmable current limit and thermal shutdown.
It operates with an input voltage range from 5.5 V to 28 V.
The slew rate rise time, Ton, can be set using the
following equation:
Css V IN
Ton = -------------------------30A
Enable
Programmable Current Limit
The EN pin is the On/Off control for the output switch.
It is an active-high input. The EN pin is active after VIN is
above the UVLO threshold of 4.9 V. Conversely, the
EN pin will be deactivated if the VIN falls below the UVLO
of 2.0V. The EN pin must be driven to a logic high or logic
low state to guarantee operation. While disabled, the
AOZ1360 only draws approximately 1 µA supply current.
The EN is a high impedance input with an ESD protection
diode to ground and should not be forced below ground.
This input level is compatible with most microcontroller
outputs and other logic families.
The current limit is programmed by an external resistor
connected between the SET pin and ground. This sets a
reference voltage to the current limit error amplifier that
compares it to a sensed voltage that is generated by
passing a small portion of the load current through an
internal amplifier. When the sensed load current exceeds
the set current limit, the load current is then clamped at
the set limit and the Vout drops to whatever voltage is
necessary to clamp the load current. The AOZ1360 will
stay in this condition until the load current no longer
exceeds the current limit or if the thermal shutdown
protection is engaged.
Under-Voltage Lockout (UVLO)
The under-voltage lockout (UVLO) circuit of the
AOZ1360 monitors the input voltage and prevents the
output MOSFET from turning on until VIN exceeds 4.9 V.
Adjustable Soft-Start Slew-Rate Control
When the EN pin is high, the slew rate control circuitry
applies voltage on the gate of the PMOS switch in a
manner such that the output voltage and current is
ramped up linearly until it reaches the steady-state load
current level. The slew rate can be adjusted by an
external capacitor connected between the SS pin
and ground.
Rev. 2.0 January 2015
Thermal-Shutdown Protection
During current limit or short circuit conditions, the PMOS
resistance is increased to clamp the load current. This
increases the power dissipation in the chip causing the
die temperature to rise. When the die temperature
reaches 130 °C the thermal shutdown circuitry will
shutdown the device. There is a 30 °C hysteresis after
which the device will turn back on and go through soft
start. The thermal shutdown will cycle repeatedly until the
short circuit condition is resolved or the enable pin is
pulled LOW externally.
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Page 8 of 16
AOZ1360
Application Information
Input Capacitor Selection
Slew Rate Setting
The input capacitor prevents large voltage transients
from appearing at the input and provides the
instantaneous current needed each time the switch
turns on. The input capacitor also limits input voltage
drop and prevents high-frequency noise on the power
line from passing through the output of the power side.
The choice of input capacitor is based on its ripple
current and voltage ratings rather than the actual
capacitance value. The input capacitor should be located
as close to VIN as possible. A 1 µF ceramic cap is
recommended. However, higher capacitor values will
further reduce the voltage drop at the input.
Slew rate is set by changing the capacitor value on the
SS pin of the device. A capacitor connected between the
SS pin and ground will reduce the output slew-rate. The
capacitive range is 0.001 µF to 0.1 µF. Refer to Figure 4.
45
40
35
30
Slew Rate 25
(ms)
20
15
Output Capacitor Selection
The output capacitor acts in a similar way. A small 0.1 µF
capacitor prevents high-frequency noise from going into
the system. Also, the output capacitor has to supply
enough current for any large load that may occur during
system transients. This bulk capacitor must be large
enough to supply fast transient load in order to
prevent the output from dropping.
10
5
0
0
0.02
0.04
0.06
0.08
0.1
Capacitance (μF)
Figure 4. Output Slew Rate Adjustment vs. Capacitance
Current Limit Setting
The current limit is set by an external resistor connected
to the SET pin. Refer to Figure 3 for current limit settings.
Power Dissipation Calculation
Calculate the power dissipation for normal load condition
using the following equation:
PD = RON x (IOUT)2
AOZ1360 Rset vs ILIM
7
4
The worst case power dissipation occurs when the
load current hits the current limit due to over-current or
short circuit faults. The power dissipation under these
conditions can be calculated using the following
equation:
3
PD = (VIN – VOUT) x ILIMIT
6
5
ILIM (A)
2
1
0
35
45
55
65
75
85
95
105
RSET (kΩ)
Figure 3
Rev. 2.0 January 2015
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Page 9 of 16
AOZ1360
Layout Guidelines
Proper PCB layout is important for improving the thermal
and overall performance of the AOZ1360. To optimize the
switch response time for outputting short-circuit
conditions, keep all traces as short as possible. This will
also reduce the effect of unwanted parasitic inductance.
IN
1
8 OUT
IN
2
7 OUT
Place the input and output bypass capacitors as close as
possible 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.
IN 1
IN 2
C1
C1
GND 3
6
SET
SS 4
5
EN
C3
C2
GND 4
C3
9 OUT
8 NC
NC 3
SS 5
R1
OUT
10 OUT
GND
C2
7 SET
6 EN
R1
GND
Figure 5. AOZ1360AI (SO-8) Layout
Rev. 2.0 January 2015
Figure 6. AOZ1360DI (DFN4x4 10L) Layout
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Page 10 of 16
AOZ1360
Package Dimensions, SO-8L
D
Gauge Plane
Seating Plane
e
0.25
8
L
E1
E
h x 45
1
C
θ
7 (4x)
A2 A
0.1
b
RECOMMENDED LAND PATTERN
2.20
5.74
2.87
1.27
0.80
0.635
A1
Dimensions in millimeters
Symbols
A
A1
A2
b
c
D
E
e
E1
h
L
θ
Min.
1.35
0.10
1.25
0.31
0.17
4.80
3.80
Nom.
1.65
—
1.50
—
—
4.90
3.90
1.27 BSC
5.80
6.00
0.25
—
0.40
—
—
0°
Max.
1.75
0.25
1.65
0.51
0.25
5.00
4.00
6.20
0.50
1.27
8°
Dimensions in inches
Symbols
A
A1
A2
b
c
D
E
e
E1
h
L
θ
Min.
0.053
0.004
0.049
0.012
0.007
0.189
0.150
Nom. Max.
0.065 0.069
—
0.010
0.059 0.065
—
0.020
—
0.010
0.193 0.197
0.154 0.157
0.050 BSC
0.228 0.236 0.244
0.010
—
0.020
0.016
—
0.050
—
0°
8°
UNIT: mm
Notes:
1. All dimensions are in millimeters.
2. Dimensions are inclusive of plating
3. Package body sizes exclude mold flash and gate burrs. Mold flash at the non-lead sides should be less than 6 mils.
4. Dimension L is measured in gauge plane.
5. Controlling dimension is millimeter, converted inch dimensions are not necessarily exact.
Rev. 2.0 January 2015
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Page 11 of 16
AOZ1360
Tape and Reel Dimensions, SO-8
Carrier Tape
P1
D1
P2
T
E1
E2
E
B0
K0
A0
D0
P0
Feeding Direction
UNIT: mm
Package
A0
B0
K0
D0
D1
E
E1
E2
P0
P1
P2
T
SO-8
(12mm)
6.40
±0.10
5.20
±0.10
2.10
±0.10
1.60
±0.10
1.50
±0.10
12.00
±0.10
1.75
±0.10
5.50
±0.10
8.00
±0.10
4.00
±0.10
2.00
±0.10
0.25
±0.10
Reel
W1
S
G
V
N
M
K
R
H
W
UNIT: mm
W
N
Tape Size Reel Size
M
12mm
ø330
ø330.00 ø97.00 13.00
±0.10 ±0.30
±0.50
W1
17.40
±1.00
H
K
ø13.00
10.60
+0.50/-0.20
S
2.00
±0.50
G
—
R
—
V
—
Leader/Trailer and Orientation
Trailer Tape
300mm min. or
75 empty pockets
Rev. 2.0 January 2015
Components Tape
Orientation in Pocket
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Leader Tape
500mm min. or
125 empty pockets
Page 12 of 16
AOZ1360
Package Dimensions, DFN-10L, 4x4
D
3
INDEX AREA
(D/2xE/2)
A
e
B
D/2
L3*
10
6
L
D/2
*L4
E
E1/2
L1
E1
L2
2
* L4
Pin 1
1
5
D2
A1
A3
Seating
Plane
10x 5
ddd
D1
BOTTOM VIEW
6 TOP VIEW
A
C
4
b
eee
SIDE VIEW
Dimensions in millimeters
RECOMMENDED LAND PATTERN
0.65 Typ.
0.65 Typ.
0.35 TYP
10
6
0.30
0.38
2.30
1.15
Pin #1 IDA
Chamfer 0.20
3.55
0.02
1.78
0.30
5
1
1.42
Pin #1 IDA
Chamfer 0.20
Unit: mm
Notes:
1. All dimensions are in millimeters.
Symbols
A
A1
A3
b
D
D1
D2
Min.
0.70
0.00
0.30
3.95
1.58
1.22
Nom. Max.
0.75
0.80
0.02
0.05
0.203 REF
0.35
0.40
4.00
4.05
1.68
1.78
1.32
1.42
E
E1
e
L
L1
3.95
2.20
4.05
2.40
L2
L3
L4
0.28
Dimensions in inches
Symbols
A
A1
A3
b
D
D1
D2
Min.
0.028
0.000
0.156
0.087
0.60
0.12
E
E1
e
L
L1
0.38
0.48
0.85 REF
0.30 REF
L2
L3
L4
0.011 0.015 0.019
0.033 REF.
0.012 REF
4.00
2.30
0.65 BSC
0.50
0.55
—
0.02
Nom. Max.
0.030 0.031
0.001 0.002
0.008 REF
0.012 0.014 0.016
0.156 0.157 0.159
0.062 0.066 0.070
0.048 0.052 0.056
0.157 0.159
0.091 0.094
0.026 BSC
0.020 0.022 0.024
—
0.001 0.005
aaa
bbb
0.15
0.10
aaa
bbb
0.006
0.004
ccc
ddd
eee
0.10
0.08
0.05
ccc
ddd
eee
0.004
0.003
0.002
2. The dimensions with * are just for reference.
3. The location of the terminal #1 identifier and terminal numbering convention conforms to JEDEC publication 95 SPP-002.
4. Dimension b applies to metallized terminal and is measured between 0.15mm and 0.30mm from the terminal tip. If the terminal has the
optional radius on the other end of the terminal, then dimension b should not be measured in that radius area.
5.
Coplanarity applies to the terminals and all other bottom surface metallization.
6.
Drawings shown are for illustration only.
Rev. 2.0 January 2015
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Page 13 of 16
AOZ1360
Tape and Reel Dimensions, DFN-10L, 4x4
Carrier Tape
P1
D1
P2
T
E1
E2
C
L
E
B0
K0
D0
P0
A0
Feeding Direction
UNIT: MM
Package
A0
B0
K0
D0
D1
E
E1
E2
P0
P1
P2
T
DFN 4x4
(12mm)
4.35
±0.10
4.35
±0.10
1.10
±0.10
1.50
Min.
1.50
+0.1/-0.0
12.0
±0.3
1.75
±0.10
5.50
±0.05
8.00
±0.10
4.00
±0.10
2.00
±0.05
0.30
±0.05
Reel
W1
S
G
N
M
V
K
R
H
W
UNIT: MM
Tape Size
Reel Size
M
N
W
W1
H
K
S
G
R
V
12 mm
ø330
ø330.0
ø79.0
12.4
+2.0/-0.0
17.0
+2.6/-0.0
ø13.0
10.5
±0.2
2.0
±0.5
—
—
—
±2.0
±1.0
±0.5
Leader/Trailer and Orientation
Trailer Tape
300mm min. or
75 empty pockets
Rev. 2.0 January 2015
Components Tape
Orientation in Pocket
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Leader Tape
500mm min. or
125 empty pockets
Page 14 of 16
AOZ1360
Part Marking
SO-8
Z1360AI
Underscore Indicates
Green Product
FAYWLT
Part Number Code
Assembly Lot Code
Fab & Assembly Location
Year & Week Code
DFN-10
Z1360DI
Underscore Indicates
Green Product
ZA8R1B
Fab & Assembly Location
Part Number Code
Assembly Lot Code
Year & Week Code
Rev. 2.0 January 2015
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AOZ1360
LEGAL DISCLAIMER
Alpha and Omega Semiconductor makes no representations or warranties with respect to the accuracy or
completeness of the information provided herein and takes no liabilities for the consequences of use of such
information or any product described herein. Alpha and Omega Semiconductor reserves the right to make changes
to such information at any time without further notice. This document does not constitute the grant of any intellectual
property rights or representation of non-infringement of any third party’s intellectual property rights.
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. 2.0 January 2015
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.
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