AOZ1376DI
ECPower™ 20V 20mΩ Protection Switch
with True Reverse Current Blocking
General Description
Features
The AOZ1376DI power switch is intended for
applications that require circuit protections. The input
operating voltage ranges between 3.4V and 22V, making
it ideal for USB Type-C power delivery applications. VIN
and VOUT terminals are rated as 28V Absolute
Maximum. The AOZ1376DI provides under-voltage
lockout, over-voltage and over-temperature protection
function. The over-voltage protection threshold is
selectable by an external resistor. The internal soft-start
circuitry controls inrush current due to highly capacitive
loads. The slew rate can be adjusted using an external
capacitor.
20m typical ON resistance
3.4V to 22V operating input voltage
VIN and VOUT are rated 28V Abs max.
True reverse current blocking when VOUT > VIN
Selectable over-voltage protection
Programmable soft-start
VIN under-voltage lockout
VIN over-voltage lockout
Thermal shutdown protection
Short-circuit protection
The AOZ1376DI has True Reverse-Current Blocking
(TRCB) protection to avoid undesired reverse-current
from VOUT to VIN at all time.
±4kV HBM ESD rating
±8kV HBM ESD rating for VIN and VOUT
IEC61000-4-2: ±8kV on VIN
The AOZ1376DI is available in a 3mm x 3mm DFN-12
package which can operate over -40°C to +85°C
temperature range.
IEC61000-4-5: 40V on VIN, No Capacitor
3mm x 3mm DFN-12L package
Applications
Thunderbolt/USB Type-C PD power switch
Portable devices
Notebook/desktop computers
Monitors
Docking station/dongles
Typical Application
CIN
TVS
Diode
(optional)
USB
Connector
Charger
VOUT
VIN
VBUS
COUT
SS
POVP
ROVP
AOZ1376DI
C SS
5V
RFLTB
PD
Controller
FLTB
ENB
GND
GND
Rev. 2.3 December 2019
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Page 1 of 14
AOZ1376DI
Ordering Information
Part Number
Fault Recovery
Temperature Range
Package
Environmental
AOZ1376DI-01
Auto-Restart
-40°C to +85°C
3mm x 3mm DFN-12L
RoHS
AOZ1376DI-02
Latch-Off
-40°C to +85°C
3mm x 3mm DFN-12L
RoHS
All AOS products are offered in packages with Pb-free plating and compliant to RoHS standards.
Pin Configuration
VOUT
`
VOUT
POVP
FLTB
VIN
VIN
NC
Exposed
Pad
NC
ENB
NC
GND
SS
3mm x 3mm DFN-12L
(Top Transparent View)
Pin Description
Pin Number
Pin Name
1, 2
VOUT
Output pins. Connect to internal load.
3
POVP
Programmable over voltage protection. Connect a resistor ROVP from POVP to GND.
4
FLTB
Fault Indicator, Open-drain output. Active Low when fault condition occurs.
5
ENB
Enable logic input. Active-low.
6
GND
Ground.
7
SS
Soft-start pin. Connect a capacitor CSS from SS to GND to set the soft-start time.
8, 9, 10
NC
No connect. Leave these pins float.
11, 12
VIN
Connect to adapter or power input.
EXP
Exposed Thermal Pad. Connect to GND. Solder to a metal surface directly underneath the
EXP and connect to PCB ground on multiple layers through vias. For best thermal performance make the ground copper pads as large as possible and connect to EXP with multiple
VIAs.
EXP
Rev. 2.3 December 2019
Pin Function
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Page 2 of 14
AOZ1376DI
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
Parameter
Rating
VIN, VOUT to GND
-0.3V to +28V
ENB, SS, FLTB, POVP to GND
-0.3V to +6V
Junction Temperature (TJ)
+150°C
Storage Temperature (TS)
-65°C to +150°C
ESD Rating HBM All Pins
±4kV
ESD Rating HBM VIN and VOUT Pins
±8kV
Rating
Supply Voltage VIN
3.4V to 22V
ENB, FLTB, SS
0V to 5.5V
POVP
0V to 3V
DC Switch Current (ISW)
0A to 5A
Ambient Temperature (TA)
-40°C to +85°C
Package Thermal Resistance
3x3 DFN-12 (JA)
50°C/W
Electrical Characteristics
TA = 25°C, VIN = 20V, ENB = 0V, ROVP=19.6k, unless otherwise specified.
Symbol
VVIN
Parameter
Input Supply Voltage
VUVLO
Under-voltage Lockout Threshold
VUVLO_HYS
Under-voltage Lockout Hysteresis
VOVLO
Conditions
Overvoltage Lockout Threshold
VIN rising
Min.
Typ.
Max.
Units
3.4
22
V
3.0
3.35
V
300
mV
0ROVP 19.6k, VIN rising, 1%
23.0
24.0
25.0
ROVP = 75kVIN rising, 1%
16.8
17.4
18.0
ROVP = 137kVIN rising, 1%
10.0
10.4
10.8
ROVP = 301kVIN rising, 1%
5.5
5.8
6
V
VOVLO_HYS
Overvoltage Lockout Hysteresis
tDELAY_OVP
Switch Turn-off Delay upon Overvoltage
VVIN - VOLVO = 500mV
IVIN_ON
Input Quiescent Current
IVOUT = 0
IVIN_OFF
Input Shutdown Current
IVOUT = 0, ENB= 5V
18
35
µA
IVOUT_OFF
Output Leakage Current
VOUT = 20V, VIN = 0V, ENB=5V
18
35
µA
IVOUT = 1A
20
mΩ
VIN= 5V, IVOUT = 1A
21
mΩ
RON_20V
RON_5V
Switch ON-Resistance
350
mV
1
µs
550
µA
VENB_H
ENB Pin Input High Threshold
ENB rising
VENB_L
ENB Pin Input Low Threshold
ENB falling
IENB_BIAS
ENB Pin Input Pull-down Current
ENB= 1.8 V
10
µA
VFLTB_LO
FLTB Pin Pull-down Voltage
FLTB sinking 3mA
0.3
V
VTRCB
TRCB Threshold
VOUT-VIN
26
mV
tTRCB
TRCB Delay Time
VOUT-VIN= VTRCB + 500mV
500
ns
tD_ON
Turn-On Delay Time
ENB to VOUT (10%)
From ENB falling edge to VOUT
reaching 10% of VIN. COUT= 68µF,
CSS= 5.6nF
21
ms
Turn-On Rise Time
VOUT from 10% to 90%
COUT = 68uF, CSS = 5.6nF
2
ms
tON
Rev. 2.3 December 2019
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1.4
0.6
V
V
Page 3 of 14
AOZ1376DI
Electrical Characteristics
TA = 25°C, VIN = 20V, ENB = 0V, ROVP=19.6k, unless otherwise specified.
Symbol
Parameter
Conditions
Min.
Typ.
AOZ1376DI-01 only
64
Max.
Units
tREC
Auto restart interval
ms
TSD
Thermal Shutdown Threshold
140
C
TSD_HYS
Thermal Shutdown Hysteresis
30
C
Functional Block Diagram
VIN
VOUT
Gate Drive &
Charge Pump
Soft
Start
POVP
OVP
Select
SS
FLTB
Control
Logic
UVLO
OVLO
TRCB
ENB
VIN
VOUT
GND
Rev. 2.3 December 2019
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Page 4 of 14
AOZ1376DI
Timing Diagrams
ENB
tON
tD_ON
90%
VOUT
10%
Figure 1. Turn-on Delay and Turn-on Time
300mV
500mV
VOVLO
VIN
VOUT
400us
tDELAY_OVP
10%
tREC
FLTB
Figure 2. OVP Delay and Recovery Time (AOZ1376DI-01)
Rev. 2.3 December 2019
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Page 5 of 14
AOZ1376DI
Typical Characteristics
CIN = 20µF, COUT=120µF, RLOAD=100Ω, CSS=5.6nF, ROVP=19.6kΩ, TA = 25°C unless otherwise specified.
VIN
(5V/div)
VIN
(2V/div)
VOUT
(2V/div)
VOUT
(5V/div)
I_IN
(1A/div)
I_IN
(1A/div)
ENB
(10V/div)
ENB
(10V/div)
5ms/div
5ms/div
Figure 3. Soft Start Delay Times (VIN=5V)
Figure 4. Soft Start Delay Times (VIN=20V)
VIN
(5V/div)
VOUT
(5V/div)
VIN
(2V/div)
VOUT
(2V/div)
I_IN
(1A/div)
I_IN
(1A/div)
500µs/div
1ms/div
Figure 5. Soft Start Ramp (VIN=5V)
Figure 6. Soft Start Ramp (VIN=20V)
VIN
(5V/div)
VOUT
(200mV/div)
VOUT
(5V/div)
VIN
(200mV/div)
I_IN
(100mA/div)
I_IN
(1A/div)
ENB
(10V/div)
FLTB
(10V/div)
10ms/div
2µs/div
Figure 7. Shutdown (VIN=20V)
Figure 8. Reverse Current Blocking (VIN=5V)
Rev. 2.3 December 2019
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Page 6 of 14
AOZ1376DI
Typical Characteristics (Continued)
CIN = 20µF, COUT=120µF, RLOAD=100Ω, CSS=5.6nF, ROVP=19.6kΩ, TA = 25°C unless otherwise specified.
VIN
(10V/div)
VIN
(10V/div)
VOUT
(10V/div)
VOUT
(10V/div)
I_IN
(2A/div)
I_IN
(2A/div)
FLTB
FLTB
(10V/div)
FLTB
(10V/div)
2s/div
2s/div
Figure 9. Over Voltage Protection
(Option -01)
Figure 10. Over Voltage Protection
(Option -02)
VOUT
(20V/div)
VOUT
(20V/div)
I_IN
(20A/div)
I_IN
(20A/div)
VIN
(10V/div)
VIN
(10V/div)
FLTB
(10V/div)
FLTB
(10V/div)
20ms/div
20ms/div
Figure 12. Short Circuit Protection
(CSS=1nF, No Load, Option -02)
Figure 11. Short Circuit Protection
(CSS= 1nF, No Load, Option -01)
VOUT
(10V/div)
VOUT
(10V/div)
IVOUT
(2A/div)
IVOUT
(200mA/
div)
25ms/div
10ms/div
Figure 13. IEC61000-4-5: 40V Surge Voltage
without Device
Figure 14. IEC6100-4-5: 40V Surge Voltage
with Device (No Capacitor on VIN)
Rev. 2.3 December 2019
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Page 7 of 14
AOZ1376DI
Typical Characteristics (Continued)
TA = 25°C, unless otherwise specified.
20
18
25°C
600
500
85°C
-40°C
400
300
200
14
12
-40°C
8
6
4
2
2
4
6
8
10
12
14
16
18
0
20
2
4
6
8
10
12
14
16
18
20
Input Voltage (V)
Input Voltage (V)
Figure 15. Quiescent Current vs. Input Voltage
Figure 16. Shutdown Current vs. Input Voltage
30
1000
25
800
VIN OVP Threshold (V)
Reverse Leakage Current (nA)
85°C
10
100
0
25°C
16
Shutdown Current (µA)
Input Quiscent Current (µA)
700
600
400
200
ROVP=19.6k
20
ROVP=75k
15
10
ROVP=137k
5
0
-40
-20
0
20
40
60
80
ROVP=301k
0
-40
100
-20
0
20
40
60
80
100
Temperature (°C)
Temperature (°C)
Figure 17. Reverse Leakage Current
vs. Temperature
Figure 18. VIN OVP vs. Temperature
(IVOUT=1A)
30
22.0
21.8
21.6
ON Resistance (m)
ON Resistance (m)
25
20
15
10
21.4
21.2
21.0
20.8
20.6
20.4
5
20.2
0
-40
-20
0
20
40
60
80
100
20.0
Temperature (°C)
5
10
15
20
25
Input Voltage (V)
Figure 19. On Resistance vs. Temperature
Rev. 2.3 December 2019
0
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Figure 20. ON Resistance vs. VIN
(IVOUT=1A)
Page 8 of 14
AOZ1376DI
Detailed Description
The AOZ1376DI is a high-side protection switch with
adjustable soft-start, over-voltage and over-temperature
protections. It is capable of operating from 3.4V to 22V.
The internal power switch consists of 2 back-to-back connected N-channel MOSFETs. When the switch is
enabled, the overall resistance between VIN and VOUT
is only 20mΩ typical, minimizing power loss and heat
generation. The back-to-back configuration of MOSFETs
completely isolates VIN and VOUT when the switch is
turned off, preventing leakage between the two pins.
Enable
The active-low ENB pin is the ON/OFF control for the
power switch. The device is enabled when the ENB pin is
low and the device is not in UVLO state. The ENB pin
must be driven to a logic low or logic high state to guarantee operation. While disabled, the AOZ1376DI draws
about 18μA supply current.
When fault occurs for AOZ1376DI-02 latch-off version,
toggle enable to restart the device and clear fault indicator.
Input Under-Voltage Lockout (UVLO)
The internal circuitry of the AOZ1376DI is powered from
VIN. The under-voltage lockout (UVLO) circuit of the
AOZ1376DI monitors the voltage at the input pin and only
allows the power switches to turn on when VIN is higher
than 3.4V. If VIN is below 3.4V, the device is in undervoltage lockout state.
Programmable Over-Voltage Protection (OVP)
The voltages at VIN pin are constantly monitored once
the device is enabled. In case the voltage exceeds the
programmed threshold, over-voltage protection is
activated:
1. If the power switch is on, it will be turned off immediately to isolate VOUT from VIN
2. OVP will prevent power switch to be turned on if it is in
off state.
In either case FLTB pin is pulled low to report the fault
condition.
An external resistor ROVP connected between POVP and
GND pins sets the over-voltage protection threshold. An
internal 8µA current source biases POVP pin. The voltage drop across resistor ROVP is detected by comparators that sets the OVP threshold based on the table
below:
Rev. 2.3 December 2019
ROVP Resistor Value
OVP Threshold
=301K
5.8V
Table 1. OVP Setting by External Resistor
True Reverse Current Blocking (TRCB)
The AOZ1376DI immediately turns off the power switch
upon detection of a VOUT that is 26mV higher than VIN.
The FLTB pin will also be immediately pulled low to indicate the fault condition.
When the AOZ1376DI is first enabled or during each
auto restart, power switch will be kept off if output voltage
exceeds input voltage by 26mV.
Thermal Shutdown Protection
When the die temperature reaches 140°C the power
switch is turned off. There is a 30°C hysteresis. Overtemperature fault is removed when die temperature
drops below approximately 110°C.
Soft-Start Slew-Rate Control
When ENB pin is asserted low, the slew rate control circuitry applies voltage on the gate of the power switch in a
manner such that the output voltage is ramped up linearly
until it reaches input voltage level. The output ramp up
time depends on the VIN and POVP setting and is programmed by an external soft-start capacitor (Css). The
following formula provides the estimated 10% to 90%
ramp up time.
V C
t SS VIN SS 100
V OVP 0.0023
Where VIN and VOVP are in volts and CSS is in nF. tSS
value is provided in µs.
For example, if VIN= 20V, VOVP= 24V and CSS=2.7nF,
the VOUT ramp up time is 895µs.
System Startup
The device is enabled when ENB ≤ 0.6V and VIN is
higher than UVLO threshold. The OVP threshold is first
selected by sensing POVP voltage set by ROVP. The
device will then check if fault condition exist. When no
fault exists, the power switch is turned on and VOUT is
then ramped up, controlled by the soft-start till it reaches
the input voltage.
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AOZ1376DI
Fault Protection
The AOZ1376DI offers protection against the following
fault conditions: VIN over voltage, VOUT being higher
than VIN, and over temperature.
When the device is first enabled, the power switch is off
and fault conditions are checked. If VIN is higher than the
OVP threshold, or VOUT is higher than VIN by 26mV
(typical), or the die temperature is higher than thermal
shutdown threshold, the FLTB pin will be pulled low to
flag the fault. After the power switch turns on, the device
continuously monitors all fault conditions.
Layout Guidelines
Good PCB layout is important for improving the thermal
and overall performance of the AOZ1376DI. To optimize
the switch response time to output short-circuit conditions, keep all traces as short as possible to reduce the
effect of unwanted parasitic inductance. Place the input
and output bypass capacitors as close as possible to the
VIN and VOUT 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. Figure 21 shows the reference
evaluation board layout for AOZ1376DI.
Auto-Restart vs. Latch-Off
AOZ1376DI-01 (auto-restart version):
If the power switch is turned off due to fault protection,
the device will try to restart 64ms (tREC) after the fault
clears.
AOZ1376DI-02 (latch-off version):
The power switch keeps off even after the fault clears.
The device can only be re-enabled by either toggling
ENB pin or cycling the input power supply.
Input Capacitor Selection
The input capacitor prevents large voltage transients
from appearing at the input, and provides the instantaneous current needed each time the switch turns on to
charge output capacitors and to limit input voltage drop. It
is also to prevent high-frequency noise on the power line
from passing through to the output. The input capacitor
should be located as close to the pin as possible. A 10μF
ceramic capacitor is recommended. However, higher
capacitor values further reduce the transient voltage drop
at the input.
Figure 21. AOZ1376DI Evaluation Board Layout
Output Capacitor Selection
The output capacitor acts in a similar way. Also, the output capacitor has to supply enough current for a large
load that it may encounter during system transient. This
bulk capacitance must be large enough to supply fast
transient load in order to prevent the output from dropping.
If the output capacitance is so high that at the end of the
soft start output voltage is lower than input voltage by
approximately 300mV or more, the power switch will be
turned off to protect itself.
Power Dissipation Calculation
Use the following equation to calculate the power dissipation for normal load condition:
Power Dissipated = RON × (IOUT)2
Rev. 2.3 December 2019
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Page 10 of 14
AOZ1376DI
Package Dimensions, DFN3x3B-12L, EP1_S
RECOMMENDED LAND PATTERN
SYMBOLS
UNIT: mm
A
A1
b
b1
c
D
D1
E
E1
e
L
L1
L2
aaa
bbb
ccc
ddd
DIMENSIONS IN MILLIMETERS
MIN
NOM
%6&
DIMENSIONS IN INCHES
MAX
MIN
NOM
%6&
MAX
NOTE
1. DIMENSIONING AND TOLERANCING CONFORM TO ASME Y14.5M-1994.
2. CONTROLLING DIMENSION IS MILLIMETER.
CONVERTED INCH DIMENSIONS ARE NOT NECESSARILY EXACT.
3. 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, THE DIMENSION b SHOULD NOT BE
MEASURED IN THAT RADIUS AREA.
4. COPLANARITY ddd APPLIERS TO THE TERMINALS AND ALL OTHER BOTTOM SURFACE
METALLIZATION.
Rev. 2.3 December 2019
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Page 11 of 14
AOZ1376DI
Tape and Reel Dimensions, DFN3x3B-12L, EP1_S
Rev. 2.3 December 2019
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Page 12 of 14
AOZ1376DI
Tape and Reel Dimensions, DFN3x3B-12L, EP1_S
Rev. 2.3 December 2019
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Page 13 of 14
AOZ1376DI
Part Marking
AOZ1376DI-0X
(DFN3x3)
AT0X
Option Code (See Table Below)
Special Code
Part Number Code
YWLT
Assembly Lot Code
Year & Week Code
Part Number
Description
Code
AOZ1376DI-01
Green Product
AT01
AOZ1376DI-02
Green Product
AT02
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. 2.3 December 2019
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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