aoz1360 Alpha & Omega Semiconductor, aoz1360 Datasheet - Page 7

• Manufacturer Part Number: aoz1360
• Description: Programmable Current-limited Load Switch
• Manufacturer: Alpha & Omega Semiconductor

Alpha & Omega Semiconductor
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
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
3.5
2.5
1.5
0.5
1.00E+04
4
3
2
1
0
1.00E+05
AOZ1360 Rset vs Ilimit
7
Rset (ohms)
Alpha and Omega Semiconductor Confidential
1.00E+06
1.00E+07
AOZ1360