AOZ1360 [AOS]
28V Programmable Current-Limited Load Switch; 28V的可编程限流负载开关
| 型号： | AOZ1360 |
| 厂家： | 
ALPHA & OMEGA SEMICONDUCTORS |
| 描述： | 28V Programmable Current-Limited Load Switch |
| 文件： | 总12页 (文件大小：917K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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
Semiconductor’s high-side load switch family
intended for applications that require circuit
protection. The device operates from voltages
between 5.5V and 28V, and can handle a
continuous current up to 3A. The internal current
limiting circuit protects the input supply voltage from
large load current. 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 inrush current due to highly
capacitive loads associated with hot-plug events. It
features low quiescent current of 220µA and the
supply current reduces to less than 1µA in
shutdown.
35mΩ maximum on resistance
2A minimum continuous current.
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 and 4mm x4mm DFN-10
package
Applications
Notebook PCs
Hot swap supplies
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
AOZ1360 Preliminary Data Sheet Rev0
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AOZ1360
Ordering Information
Part Number
AOZ1360AI
AOZ1360DI
Package
SO-8
Temperature Range
-40°C to +85°C
Environmental
RoHS
DFN4x4 10L
RoHS
-40°C to +85°C
Pin Configuration
TOP VIEW
TOP VIEW
1
8
7
6
5
OUT
OUT
SET
EN
IN
10
9
1
2
3
4
5
OUT
OUT
NC
IN
OUT
GND
2
IN
IN
8
NC
GND
SS
3
GND
7
SET
EN
4
SS
6
SO-8
DFN4X4 10L
Note: Connect all IN pins externally.
Pin Description
SO-8
DFN4x4 10L Pin
Pin Function
Pin Number Name
Pin Number
1,2
1,2
IN
P-channel MOSFET source. Connect a 1uF capacitor from IN to
GND.
3
4
4
5
GND
SS
Ground.
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
6
7
EN
Enable Input. Two options are available: active high and active low. See
Ordering Information for details.
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.
AOZ1360 Preliminary Data Sheet Rev0
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AOZ1360
Absolute Maximum Ratings(1)
Operating Ratings
IN to GND..........................................-0.3V to +30V
EN, SET, OUT to GND..............-0.3V to VIN + 0.3V
SS, SET…………………………….…..-0.3V to +6V
Maximum Continuous Current............................ 3A
Maximum Junction Temperature (TJ)..........+150°C
ESD Rating (HBM) ........................................2.5kV
Thermal Resistance (SO-8)........................82°C/W
Thermal Resistance (DFN4X4)...................63°C/W
Electrical Characteristics
VIN = 12V, TA = -40°C to +85°C unless otherwise stated. Typical values are at 25°C
Parameter
Symbol
VIN
Conditions
MIN
TYP
MAX
28
UNITS
Input Supply Voltage
5.5
V
V
Undervoltage Lockout
Threshold
VUVLO
IN rising
4.9
400
220
5.4
Undervoltage Lockout
Hysteresis
VUVHYS
mV
Input Quiescent Current
Input Shutdown Current
Output Leakage Current
Switch On Resistance
Switch On Resistance
Current Limit
IIN_ON
IIN_OFF
ILEAK
EN = IN for -00, EN = GND for -01, no load
EN = GND for -00, EN = IN for -01, no load
EN = GND for -00, EN = IN for -01, no load
AOZ1360AI VIN = 12V
400
1
μA
μA
μA
mΩ
mΩ
A
1
RDS(ON)
RDS(ON)
ILIM
22
33
35
43
3.4
AOZ1360AI VIN = 5.5V
2
2.7
RSET = 84.5kΩ (SO8)
RSET = XXX kΩ (DFN)
Enable Input Low Voltage
VEN_H
0.8
1
V
V
Enable Input High Voltage VEN_L
2.0
Enable Input Hysteresis
Enable Input Bias Current
VEN_HYS
100
mV
μA
μs
IEN_BIAS
(2)
Turn-On Delay Time
EN_50% to OUT_10%
Td_on
RL=120Ω, CL = 1μF, SS = Floated
RL=120Ω, CL = 1μF, SS = Floated
220
Turn-On Rise Time
tON
280
μs
OUT_10% to 90%
360
280
130
RL=120Ω, CL = 1μF, CSS = 1nF
μs
μs
°C
Turn-Off Fall Time
tOFF
TSD
RL=120Ω, CL = 1μF, SS = Floated
Thermal Shutdown
Threshold
Thermal Shutdown
Hysteresis
TSD_HYS
30
°C
(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.
AOZ1360 Preliminary Data Sheet Rev0
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AOZ1360
Typical Operating Characteristics
Functional Characteristics
Turn-On
(Vin = 12V, R = 5.6Ω)
Turn-Off
(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
(Vin = 12V, R = 3.6Ω)
Over Temperature
(Vin = 12V, R = 3.6Ω)
Vin
Vin
5V/div
2V/div
Vout
Vout
2V/div
2V/div
EN
1V/div
EN
1V/div
Iout
Iout
0.5A/div
0.5A/div
5ms/div
100ms/div
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AOZ1360
Timing Diagram
VIH
VIL
EN
90%
90%
10%
TD(ON)
OUT
TD(OFF)
TR
Figure 1 AOZ1360 Timing Diagram
Functional Block Diagram
Figure 2 Functional Block Diagram
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AOZ1360
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:
C
SS *VIN
Ton =
30μA
AOZ1360 Preliminary Data Sheet Rev0
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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
4
3.5
3
2.5
2
1.5
1
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.
AOZ1360 Preliminary Data Sheet Rev0
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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:
2
PD = RON x (IOUT
)
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
AOZ1360 Package Marking
SO-8
DFN4x4 10L
LOGO
Z 1 3 6 0 D I
Z A 8 R 1 B
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AOZ1360
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AOZ1360
Package Dimensions, DFN4X4
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AOZ1360
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