AOZ1360

28V Programmable Current-Limited Load Switch

Preliminary DATASHEET
(Specifications subject to change)

General Description Features

The AOZ1360 is a member of Alpha and Omega ƒ 35mΩ maximum on resistance
Semiconductor’s high-side load switch family ƒ 2A minimum continuous current.
intended for applications that require circuit ƒ Programmable current limit
protection. The device operates from voltages ƒ 5.5V to 28V operating input voltage
between 5.5V and 28V, and can handle a ƒ Low quiescent current
continuous current up to 3A. The internal current
ƒ Under-voltage lockout
limiting circuit protects the input supply voltage from
large load current. The current limit can be set with ƒ Thermal shutdown protection
an external resistor. The AOZ1360 provides thermal ƒ 2.5kV ESD rating
protection function that limits excessive power ƒ Available in SO-8 and 4mm x4mm DFN-10
dissipation. The device employs internal soft-start package
circuitry to control inrush current due to highly
capacitive loads associated with hot-plug events. It Applications
features low quiescent current of 220µA and the ƒ Notebook PCs
supply current reduces to less than 1µA in
ƒ Hot swap supplies
shutdown.

The AOZ1360 is available in the SO-8 & 4x4DFN-

10 package which can operate over -40°C to +85°C
temperature range.

Typical Application Circuit

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Alpha & Omega Semiconductor AOZ1360

Ordering Information
Part Number Package Temperature Range Environmental
AOZ1360AI SO-8 -40°C to +85°C RoHS
AOZ1360DI DFN4x4 10L -40°C to +85°C RoHS

Pin Configuration
TOP VIEW
TOP VIEW

IN 1 8 OUT IN 1 10 OUT
OUT
IN 2 7 OUT IN 2 9 OUT

GND 3 6 SET NC 3 8 NC
GND 4 GND
7 SET
SS 4 5 EN
SS 5 6 EN
SO-8

DFN4X4 10L

Note: Connect all IN pins externally.

Pin Description
SO-8 DFN4x4 10L Pin Pin Function
Pin Number Pin Number Name
1,2 1,2 IN P-channel MOSFET source. Connect a 1uF capacitor from IN to
GND.
3 4 GND Ground.
4 5 SS 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.
5 6 EN Enable Input. Two options are available: active high and active low. See
Ordering Information for details.
6 7 SET Current Limit Set Pin. Connect a resistor from SET to GND to set the
switch current limit.
3,8 NC No Connect
7,8 9,10 OUT P-channel MOSFET Drain. Connect a 0.1uF capacitor from OUT to GND.

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Alpha & Omega Semiconductor AOZ1360

Absolute Maximum Ratings(1) Operating Ratings

IN to GND ..........................................-0.3V to +30V Thermal Resistance (SO-8) ........................82°C/W
EN, SET, OUT to GND..............-0.3V to VIN + 0.3V
SS, SET…………………………….…..-0.3V to +6V Thermal Resistance (DFN4X4)...................63°C/W
Maximum Continuous Current............................ 3A
Maximum Junction Temperature (TJ)..........+150°C
ESD Rating (HBM) ........................................2.5kV

Electrical Characteristics
VIN = 12V, TA = -40°C to +85°C unless otherwise stated. Typical values are at 25°C

Parameter Symbol Conditions MIN TYP MAX UNITS

Input Supply Voltage VIN 5.5 28 V
Undervoltage Lockout VUVLO IN rising 4.9 5.4 V
Threshold
Undervoltage Lockout VUVHYS 400 mV
Hysteresis
Input Quiescent Current IIN_ON EN = IN for -00, EN = GND for -01, no load 220 400 μA
Input Shutdown Current IIN_OFF EN = GND for -00, EN = IN for -01, no load 1 μA
Output Leakage Current ILEAK EN = GND for -00, EN = IN for -01, no load 1 μA
Switch On Resistance RDS(ON) AOZ1360AI VIN = 12V 22 35 mΩ
Switch On Resistance RDS(ON) AOZ1360AI VIN = 5.5V 33 43 mΩ
Current Limit ILIM RSET = 84.5kΩ (SO8) 2 2.7 3.4 A
RSET = XXX kΩ (DFN)
Enable Input Low Voltage VEN_H 0.8 V
Enable Input High Voltage VEN_L 2.0 V
Enable Input Hysteresis VEN_HYS 100 mV
Enable Input Bias Current IEN_BIAS 1 μA
Turn-On Delay Time Td_on RL=120Ω, CL = 1μF, SS = Floated 220
(2) μs
EN_50% to OUT_10%
Turn-On Rise Time tON RL=120Ω, CL = 1μF, SS = Floated 280 μs
OUT_10% to 90%
RL=120Ω, CL = 1μF, CSS = 1nF 360 μs
Turn-Off Fall Time tOFF RL=120Ω, CL = 1μF, SS = Floated 280 μs
Thermal Shutdown TSD 130 °C
Threshold
Thermal Shutdown TSD_HYS 30 °C
Hysteresis

(1) Stresses beyond the Absolute Maximum Ratings may cause permanent damage to the device.
(2) Depends on the gate loading of the discrete PMOS, to be confirmed by silicon data.

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Typical Operating Characteristics

Functional Characteristics

Turn-On Turn-Off
(Vin = 12V, R = 5.6Ω) (Vin = 12V, R = 5.6Ω)

Vin Vin
2V/div 2V/div

Vout Vout
2V/div 2V/div

EN EN
1V/div 1V/div

Iout Iout
0.5A/div 0.5A/div
1ms/div 20us/div

Current Limit Over Temperature

(Vin = 12V, R = 3.6Ω) (Vin = 12V, R = 3.6Ω)

Vin Vin
5V/div 2V/div

Vout Vout
2V/div 2V/div

EN
EN 1V/div
1V/div

Iout Iout
0.5A/div 0.5A/div

5ms/div 100ms/div

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Timing Diagram

VIH
EN VIL

90% 90%

OUT 10%
TD(OFF)
TD(ON) TR

Figure 1 AOZ1360 Timing Diagram

Functional Block Diagram

Figure 2 Functional Block Diagram

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Detailed Description

Introduction
The AOZ1360 is a 35mΩ 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 5.5V to 28V and
can handle a continuous current of 2A.

Enable
The Enable pin is the ON/OFF control for the output switch. It’s an active-high input. The EN pin is active after
VIN is above the UVLO threshold of 4.9 V. Conversely, the Enable will be de-activated 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 about 1uA 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.

Under-Voltage Lockout (UVLO)

The under-voltage lockout (UVLO) circuit of AOZ1300 monitors the input voltage and prevents the output
MOSFET from turning on until VIN exceeds 4.9V.

Adjustable Soft-Start Slew-Rate Control

When the EN pin is asserted 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 to the SS pin to ground. The
slew rate rise time, Ton, can be set using the following equation:
CSS * VIN
Ton =
30 μA

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Alpha & Omega Semiconductor AOZ1360

Programmable current Limit

The current limit is programmed by an external resistor connected to the SET pin to 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
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. To set the current limit use the below
graph
AOZ1360 Rset vs Ilimit

3.5

2.5
Ilimit (A)

1.5

0.5

0
1.00E+04 1.00E+05 1.00E+06 1.00E+07
Rset (ohms)

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 hysterisys after which
the device will turn back on and go thru soft start. The thermal shutdown will cycle repeatedly until the short
circuit condition disappears or the enable pin is pulled LOW by an external monitor.

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Alpha & Omega Semiconductor AOZ1360

Applications Information
Input Capacitor Selection
Use a 1uF or larger capacitor for input bypassing. This will limit the input voltage drop during output transient
conditions. 1uF capacitor should be adequate for most applications; however, higher capacitor values will
further reduce the voltage drop. Place the bypass capacitor as close to the IN pins as feasibly possible.

Output Capacitor Selection

Use a 0.1uF or larger capacitor between the OUT and GND pins. The capacitance does not affect the turn on
slew rate; however, a larger capacitor will make the initial turn on transient smoother.

Power Dissipation Calculation

Calculate the power dissipation for normal load condition using the following equation:
PD = RON x (IOUT)2
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:
PD = (VIN – VOUT) x ILIMIT

Layout Guidelines
Good PCB layout is important for improving the thermal and overall performance of AOZ1360. 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 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.
AOZ1360AI (SO-8) Layout

AOZ1360DI (4x4 DFN) Layout

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AOZ1360 Package Marking

SO-8

DFN4x4 10L

LOGO
Z1 3 6 0 D I
ZA 8 R 1 B

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Package Dimensions, DFN4X4

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