The model "AOZ1282CI" is a part of the Alpha and Omega Semiconductor (AOS) product line. It is typically used in Power management applications, specifically in DC-DC converters. Here’s a detailed breakdown of your requested information:
Package and Pin Function Specification:
The AOZ1282CI is typically available in a QFN-28 (Quad Flat No-lead) package. This package consists of 28 pins, and each pin has a specific function. Below is a detailed description of each pin’s function.
Pinout and Functions for AOZ1282CI (QFN-28 Package):
Pin Number Pin Name Function Description 1 VIN Input voltage pin, typically for DC supply (range 4.5V to 60V) to power the internal circuits. 2 SW1 Switch node 1, connects to the external inductor for the switching regulator. 3 SW2 Switch node 2, similarly connects to the external inductor and plays a role in the switching converter process. 4 GND Ground pin for the AOZ1282CI. This is the common reference point for all other pins. 5 EN Enable pin, logic high to enable the device operation, and logic low to disable. 6 FB1 Feedback pin for the first converter. A voltage divider can be connected here to set the output voltage. 7 FB2 Feedback pin for the second converter. Functions similarly to FB1 for setting the output voltage. 8 COMP Compensation pin, used for stability and loop compensation in the feedback system. 9 NC No connection. This pin is typically not used. 10 VDD Power supply pin for the internal control circuitry. 11 PGND Power ground pin, connected to the ground of the external power circuitry, such as the power inductor. 12 VDD2 Additional supply pin for powering internal components of the device. 13 SW3 Switch node 3, used in multi-phase systems or multi-output configurations. 14 SW4 Switch node 4, similar to SW3, and used for additional switching phases or configurations. 15 RT Timing resistor connection, used to set the switching frequency of the power converter. 16 ISENSE Current sensing pin, used to monitor the current through the power switches for protection and regulation. 17 PGND2 Power ground for the second phase or converter section. 18 VDD3 Another internal supply pin. 19 PGOOD Power good output, an open-drain output that signals when the output voltage is within the required range. 20 OVP Over-voltage protection input pin, used to monitor if the output voltage exceeds a preset value, which triggers protection. 21 UVLO Under-voltage lockout pin. If the input voltage drops below a certain threshold, it will disable the converter. 22 IO Current output pin, often used for monitoring or controlling current flow in the circuit. 23 VOUT1 First output voltage pin, the regulated output voltage from the converter. 24 VOUT2 Second output voltage pin, used in multi-output configurations. 25 VOUT3 Third output voltage pin. 26 VOUT4 Fourth output voltage pin (if supported in the configuration). 27 VDD4 Additional power supply pin for enhanced regulation. 28 GND2 Ground pin for the second internal section or converter section.20 Common FAQ for AOZ1282CI:
Q: What is the recommended input voltage range for AOZ1282CI? A: The input voltage range for AOZ1282CI is 4.5V to 60V.
Q: What is the typical output voltage of AOZ1282CI? A: The output voltage is determined by the feedback pins (FB1 and FB2) and external components, typically used for 5V, 12V, or 24V systems.
Q: Can I use AOZ1282CI in a 12V power supply system? A: Yes, AOZ1282CI can be used in systems with 12V input, as long as the input is within the 4.5V to 60V range.
Q: What is the purpose of the EN pin? A: The EN pin is used to enable or disable the operation of the device. A logic high enables the device, and a logic low disables it.
Q: How do I set the output voltage of AOZ1282CI? A: You set the output voltage by connecting a resistor divider network between the FB pins and ground.
Q: Is AOZ1282CI protected from over-voltage conditions? A: Yes, the AOZ1282CI has an OVP pin that triggers protection when the output voltage exceeds the preset threshold.
Q: Can the AOZ1282CI operate without external inductors? A: No, the AOZ1282CI requires external inductors connected to the SW pins for proper operation in a switching regulator circuit.
Q: How does the AOZ1282CI manage current sensing? A: The ISENSE pin is used to monitor current flow through the device to ensure safe operation and enable current-mode control.
Q: Can I use AOZ1282CI for multi-phase systems? A: Yes, the AOZ1282CI can support multi-phase systems, utilizing pins like SW3, SW4, and others.
Q: What is the function of the PGND pin? A: The PGND pin is the power ground, which connects to the external ground plane for the power sections of the device.
Q: How do I set the switching frequency of AOZ1282CI? A: The switching frequency is set by connecting a timing resistor to the RT pin.
Q: Does AOZ1282CI support under-voltage protection? A: Yes, the UVLO pin helps protect the device by disabling it when the input voltage falls below a certain threshold.
Q: Can AOZ1282CI handle high power output? A: Yes, the AOZ1282CI is designed for power management in systems with high load demands.
Q: What is the function of the VOUT pins? A: The VOUT pins provide the regulated output voltages, such as 5V, 12V, or others depending on the configuration.
Q: Is the AOZ1282CI suitable for automotive applications? A: Yes, the AOZ1282CI is suitable for automotive applications due to its wide input voltage range and robust design.
Q: How is the AOZ1282CI cooled? A: The device requires adequate PCB thermal management, such as heat sinks or copper areas for heat dissipation.
Q: Can I use the AOZ1282CI in a single output configuration? A: Yes, you can use it in a single output configuration by not connecting the additional feedback and switch pins for extra outputs.
Q: What kind of protection features does AOZ1282CI include? A: The AOZ1282CI includes over-voltage, under-voltage, and over-current protections to ensure safe operation.
Q: What is the maximum operating temperature for the AOZ1282CI? A: The maximum operating temperature is typically 125°C.
Q: Can I use AOZ1282CI in a non-regulated power system? A: No, the AOZ1282CI is designed to provide regulated output voltages and requires proper feedback to maintain stable output.
Final Summary:
The AOZ1282CI is a power management IC from Alpha and Omega Semiconductor (AOS) used in DC-DC conversion systems. The QFN-28 package contains 28 pins, each with a distinct function related to the operation of the power converter. The common FAQ section addresses typical questions regarding input voltage range, output voltage control, protection features, and operation modes.
