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AOZ1360
28V Programmable Current-Limited Load Switch
Preliminary DATASHEET (Specifications subject to change)
General Description
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 220A and the supply current reduces to less than 1A in shutdown. The AOZ1360 is available in the SO-8 & 4x4DFN10 package which can operate over -40C to +85C temperature range.
Features
35m 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
Typical Application Circuit
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Ordering Information
Part Number AOZ1360AI AOZ1360DI Package SO-8 DFN4x4 10L Temperature Range -40C to +85C -40C to +85C Environmental RoHS RoHS
Pin Configuration
TOP VIEW IN 1 IN 2 GND 3 SS 4 SO-8
8 7 6 5
TOP VIEW
OUT OUT SET EN
IN IN NC
1 2 3
10
OUT OUT NC SET EN
OUT
9 8
GND 4 SS
5
GND
7 6
DFN4X4 10L
Note: Connect all IN pins externally.
Pin Description
SO-8 Pin Number 1,2 3 4 5 6 DFN4x4 10L Pin Number 1,2 4 5 6 7 3,8 9,10 Pin Name IN GND SS EN SET NC OUT Pin Function
P-channel MOSFET source. Connect a 1uF capacitor from IN to GND.
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. Enable Input. Two options are available: active high and active low. See Ordering Information for details. Current Limit Set Pin. Connect a resistor from SET to GND to set the switch current limit. No Connect P-channel MOSFET Drain. Connect a 0.1uF capacitor from OUT to GND.
7,8
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Absolute Maximum Ratings(1)
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)..........+150C ESD Rating (HBM) ........................................2.5kV
Operating Ratings
Thermal Resistance (SO-8) ........................82C/W Thermal Resistance (DFN4X4)...................63C/W
Electrical Characteristics
VIN = 12V, TA = -40C to +85C unless otherwise stated. Typical values are at 25C
Parameter Input Supply Voltage Undervoltage Lockout Threshold Undervoltage Lockout Hysteresis Input Quiescent Current Input Shutdown Current Output Leakage Current Switch On Resistance Switch On Resistance Current Limit Enable Input Low Voltage Enable Input High Voltage Enable Input Hysteresis Enable Input Bias Current Turn-On Delay Time EN_50% to OUT_10% Turn-On Rise Time OUT_10% to 90% Turn-Off Fall Time Thermal Shutdown Threshold Thermal Shutdown Hysteresis
Symbol VIN VUVLO VUVHYS IIN_ON IIN_OFF ILEAK RDS(ON) RDS(ON) ILIM VEN_H VEN_L VEN_HYS IEN_BIAS Td_on tON
Conditions IN rising
MIN 5.5
TYP 4.9 400
MAX 28 5.4
UNITS V V mV
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 AOZ1360AI VIN = 5.5V RSET = 84.5k (SO8) RSET = XXX k (DFN) 2
220
400 1 1
A A A m m A V V mV A s s s s C C
22 33 2.7
35 43 3.4 0.8
2.0 100 1 RL=120, CL = 1F, SS = Floated RL=120, CL = 1F, SS = Floated RL=120, CL = 1F, CSS = 1nF RL=120, CL = 1F, SS = Floated 220
(2)
280 360 280 130 30
tOFF TSD TSD_HYS
(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
(Vin = 12V, R = 5.6)
Turn-Off
(Vin = 12V, R = 5.6)
Vin 2V/div
Vin 2V/div
Vout 2V/div
Vout 2V/div
EN 1V/div
EN 1V/div
Iout 0.5A/div 1ms/div Current Limit
(Vin = 12V, R = 3.6)
Iout 0.5A/div 20us/div Over Temperature
(Vin = 12V, R = 3.6)
Vin 5V/div
Vin 2V/div
Vout 2V/div
Vout 2V/div EN 1V/div
EN 1V/div Iout 0.5A/div 5ms/div
Iout 0.5A/div 100ms/div
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Timing Diagram
EN OUT
VIH
VIL 90% 90% TD(OFF) TR
10% TD(ON)
Figure 1 AOZ1360 Timing Diagram
Functional Block Diagram
Figure 2 Functional Block Diagram
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Detailed Description Introduction
The AOZ1360 is a 35m 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:
Ton =
CSS * VIN 30 A
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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 Ilimit (A)
2
1.5
1
0.5
0 1.00E+04
1.00E+05 Rset (ohms)
1.00E+06
1.00E+07
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 130C the thermal shutdown circuitry will shutdown the device. There is a 30C 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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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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