AOZ1327DI
ECPower™ 20V 20mΩ Protection Switch
with True Reverse Current Blocking
General Description
Features
The AOZ1327DI 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. The VIN terminal is
rated as 28V Absolute Maximum. The AOZ1327DI provides
under-voltage lockout, over-voltage and over-temperature
protection function. The over-voltage protection threshold is
selectable through the POVP pin. The internal soft-start
circuitry controls inrush current due to highly capacitive
loads. The slew rate can be adjusted using an external
capacitor.
The AOZ1327DI has True Reverse-Current Blocking
(TRCB) protection to avoid undesired reverse-current from
VOUT to VIN at all time.
The AOZ1327DI is available in a thermally enhanced 3mm
x 3mm DFN-12 package which can operate over -40°C to
+85°C temperature range.
20m typical ON resistance
8A continuous current
20A peak current for 10ms @ 2% duty cycle
3.4V to 22V operating input voltage
VIN, VOUT are rated 28V Abs max.
True reverse current blocking
Selectable over-voltage protection
Programmable soft-start
VIN Under-voltage lockout
VIN and VOUT over-voltage lockout
Thermal shutdown protection
±4kV HBM ESD rating
IEC 61000-4-2: ±8kV on VIN
IEC 61000-4-5: 40V on VOUT, 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
Isolated
Thermal
Pad
EXP
VIN
VBUS
VOUT
CIN
TVS
Diode
USB
Connector
Charger
COUT
SS
For 24V OVP
CSS
POVP
AOZ1327DI
5V
RFLTB
PD
Controller
FLTB
ENB
GND
GND
Rev. 1.2 April 2020
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Page 1 of 16
AOZ1327DI
Ordering Information
Part Number
Fault Recovery
Temperature Range
Package
Environmental
AOZ1327DI-01
Auto-Restart
-40°C to +85°C
DFN3x3-12L
RoHS
AOZ1327DI-02
Latch-Off
-40°C to +85°C
DFN3x3-12L
RoHS
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
VOUT
`
VOUT
POVP
FLTB
VIN
VIN
NC
Exposed
Pad
NC
ENB
NC
GND
SS
DFN3x3-12L
(Top Transparent View)
Pin Description
Pin Number
Pin Name
1, 2
VOUT
Output pins. Connect to internal load.
3
POVP
Over voltage protection pin. Connect POVP to GND for 24V or leave open for 5.8V OVP.
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. It is the common drain node of the internal back-back sink switches
and it must be electrically isolated. Solder to a metal surface directly underneath EXP and
connect to floating Cu thermal pads on multiple PCB layers through VIAs. For best thermal
performance make the floating Cu pads as large as possible and connect to EXP with multiple VIAs
EXP
Rev. 1.2 April 2020
Pin Function
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Page 2 of 16
AOZ1327DI
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
Rating
-0.3V to +28V
VIN, VOUT to GND
3.4V to 22V
-0.3V to +6V
ENB, FLTB to GND
0 to 5.5V
ENB, SS, FLTB, POVP to GND
Junction Temperature (TJ)
+150°C
Storage Temperature (TS)
-65°C to +150°C
ESD Rating HBM All Pins
±4kV
IEC 61000-4-2: VIN
±8kV
POVP, SS to GND
0 to 3V
Switch Current (ISW)
0A to 8A
Peak Switch Current (ISW_PK)
10ms @ 2% Duty Cycle
20A
Ambient Temperature (TA)
-40°C to +85°C
Package Thermal Resistance
3x3 DFN-12 (JA)
36°C/W
Electrical Characteristics
TA = 25°C, VIN = 20V, ENB = 0V, POVP = 0V, unless otherwise specified.
Symbol
VVIN
Parameter
Conditions
Input Supply Voltage
VUVLO
Under-voltage Lockout Threshold
VUVLO_HYS
Under-voltage Lockout Hysteresis
VIN rising
Max.
Units
3.4
22
V
3.0
3.35
V
mV
POVP = GND, VIN rising
23.0
24.0
25.0
POVP OpenVIN rising
5.5
5.8
6
Over-voltage Lockout Threshold
VOVLO_HYS
Over-voltage Lockout Hysteresis
tDELAY_OVP
Switch Turn-off Delay upon
Overvoltage
VVIN-VOVLO = 500mV
IVIN_ON
Input Quiescent Current
IVIN_OFF
IVOUT_OFF
RON_5V
Typ.
300
VOVLO
RON_20V
Min.
V
350
mV
1
µs
IVOUT = 0
550
µA
Input Shutdown Current
IVOUT = 0, ENB = 5V
18
35
µA
Output Leakage Current
VOUT = 20V, VIN = 0V, ENB = 5V
18
35
µA
IVOUT = 1A
20
mΩ
VIN = 5V, IVOUT = 1A
21
mΩ
Switch ON-Resistance
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
20
ms
tON
Turn-On Rise Time
VOUT from 10% to 90%
COUT = 68uF, CSS = 5.6nF
1.9
ms
tREC
Auto restart interval
AOZ1327DI-01
64
ms
TSD
Thermal Shutdown Threshold
140
C
TSD_HYS
Thermal Shutdown Hysteresis
30
C
Rev. 1.2 April 2020
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1.4
0.6
V
V
Page 3 of 16
AOZ1327DI
Functional Block Diagram
EXP
VOUT
VIN
Gate Drive &
Charge Pump
Soft
Start
POVP
OVP
Select
SS
FLTB
Control
Logic
UVLO
OVLO
TRCB
ENB
VIN
VOUT
GND
Rev. 1.2 April 2020
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Page 4 of 16
AOZ1327DI
Timing Diagrams
ENB
tON
tD_ON
90%
VOUT
10%
Figure 1. Turn-on Delay and Turn-on Time
VOVLO_HYS
VOVLO
VIN
VOUT
400μs
tDELAY_OVP
10%
FLTB
tREC
Figure 2. OVP Delay and Recovery Time (AOZ1327DI-01)
Rev. 1.2 April 2020
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Page 5 of 16
AOZ1327DI
Typical Characteristics
CIN = 10µF, COUT = 120µF, RLOAD = 100Ω, CSS = 5.6nF, POVP = GND, TA = 25°C unless otherwise specified.
VIN
(2V/div)
VIN
(2V/div)
VOUT
(2V/div)
VOUT
(2V/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
(2V/div)
VIN
(5V/div)
VOUT
(2V/div)
VOUT
(5V/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)
I_IN
(100mA/div)
I_IN
(1A/div)
ENB
(10V/div)
FLTB
(10V/div)
2µs/div
10ms/div
Figure 8. True Reverse Current Blocking
(VIN = 5V)
Figure 7. Shutdown (VIN = 5V)
Rev. 1.2 April 2020
VIN
(200mV/div)
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Page 6 of 16
AOZ1327DI
Typical Characteristics (Continued)
CIN = 10µF, COUT = 120µF, RLOAD = 100Ω, CSS = 5.6nF, OVP = GND, 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
(10V/div)
FLTB
(10V/div)
2s/div
2s/div
Figure 10. Over Voltage Protection
(Option -02)
Figure 9. Over Voltage Protection (Option -01)
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 Response
(CSS = 1nF, No Load, Option -02)
Figure 11. Short Circuit Response
(CSS = 1nF, No Load, Option -01)
VOUT
(10V/div)
VOUT
(10V/div)
IVOUT
(2A/div)
IVOUT
(200mA/
div)
25ms/div
Figure 13. IEC 61000-4-5: 40V Surge Voltage
without Device
Rev. 1.2 April 2020
10ms/div
Figure 14. IEC 61000-4-5: 40V Surge Voltage
with Device (No Capacitor on VIN)
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Page 7 of 16
AOZ1327DI
Typical Characteristics (Continued)
TA = 25°C, unless otherwise specified.
20
18
25°C
600
500
Shutdown Current (µA)
Input Quiscent Current (µA)
700
85°C
-40°C
400
300
200
100
0
16
14
12
85°C
10
-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)
25°C
600
400
200
0
-40
POVP=GND
20
15
10
5
-20
0
20
40
60
80
POVP=Open
0
-40
100
-20
20
0
Temperature (°C)
40
60
80
100
Temperature (°C)
Figure 17. Reverse Leakage Current vs. Temperature
Figure 18. VIN OVP vs. Temperature
28
30
27
26
ON Resistance (m)
ON Resistance (m)
25
20
15
10
24
23
22
21
20
5
0
-40
25
19
-20
0
20
40
60
80
100
Temperature (°C)
2
4
6
8
10
12
14
16
18
20
Input Voltage (V)
Figure 19. On Resistance vs. Temperature
Rev. 1.2 April 2020
18
0
Figure 20. On Resistance vs. Input Voltage
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Page 8 of 16
AOZ1327DI
Detailed Description
The AOZ1327DI 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
and rated up to 8A.
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.
To calculate the average power dissipation during the
soft-start period: ½ of the input voltage should be used as
the output voltage will ramp towards the input voltage, as
shown in Figure 21.
For example, if the output capacitance COUT is 10µF, the
input voltage VIN is 20V, the soft-start time is 2ms, and
there is an additional 1A of system current (I_SYS), then
the average power being dissipated by the part is:
Power Delivery Capability
During start-up, the voltage at VOUT linearly ramps up to
the VIN voltage over a period of time set by the soft-start
time. This ramp time is referred to as the soft-start time
and is typically in milliseconds. Figure 21 illustrates the
soft-start condition and power dissipation.
VIN
Fully Enhanced
2
Power =(I_SW) x RON
Power = (VIN – VOUT) x I_SW
Referring to the SOA curve in Figure 22, the maximum
power allowed for 2ms (DC) is 50W (2.5A x 20V or 5A x
10V). The AOZ1327DI power switch is robust enough to
drive a large output capacitance with load in reasonable
soft-start time.
1000.0
Fast transient load
increase
Drain Current, ID (A)
Charging COUT and
Supplying system load
I_SW
System load only
Time
Figure 21. Soft start power dissipation
During this soft-start time, there will be a large voltage
across the power switch. Also, there will be current I_SW
through the switch to charge the output capacitance. In
addition, there may be load current to the downstream
system as well. This total current is calculated as:
In the soft-start condition, the switch is operating in the
linear mode, and power dissipation is high. The ability to
handle this power is largely a function of the power MOSFET linear mode SOA and good package thermal performance (Rthj-c) as the soft-start ramp time is in
milliseconds. Rthj-ambient, which is more a function of
PCB thermal performance, doesn't play a role. With a
high-reliability MOSFET as the power switch and superior packaging technology, the AOZ1327DI is capable of
dissipating this power. The power dissipated is:
Rev. 1.2 April 2020
100.0
I DM limited
10us
100us
10.0
160us
RDS(ON)
300us
500us
1ms
1.0
10m
s
DC
1s
0.1
0.0
0.01
TC = 25°C
0.1
1
10
100
Drain - Source Voltage, VDS (V)
Figure 22: Safe Operating Area (SOA) curves for Sink
power switch
After soft-start is completed, the power switch is fully on,
and it is at its lowest resistance. The power switch acts
as a resistor. Under this condition, the power dissipation
is much lower than the soft-start period. However, as this
is a continuous current, a low on-resistance is required to
minimize power dissipation. Attention must be paid to
board layout so that losses dissipated in the sinking
switch are dissipated to the PCB and hence the ambient.
With a low on-resistance of 20mΩ, the AOZ1327DI provides the most efficient power delivery without much
resistive power dissipation.
While Type C power delivery is limited to 20V @ 5A or a
100W, many high-end laptops require peak currents far
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Page 9 of 16
AOZ1327DI
in excess of the 5A. While the thermal design current
(TDC) for a CPU may be low, peak current (ICCmax in
the case of Intel and EDP in the case of AMD) of many
systemsis often 2 x thermal design current. These events
are typical of short duration (
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