AOZ1033AI

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AOZ1033AI application field and working principle

The AOZ1033AI is a 1A 10V synchronous step-down DC-DC converter designed for low component count, ease of use and maximized power density. It is part of Digital Power System’s PMIC – Voltage Regulators – DC DC Switching Regulators. This device was designed to provide up to one amp of output current from a wide input voltage range with an integrated high-side and low-side MOSFET and feedback loop circuitry. It offers a wide input voltage range of 4.5V to 12V, and an adjustable output voltage down to 0.8V. For applications that require greater efficiency, the AOZ1033AI also supports up to a 95% peak efficiency range.

The device includes a high noise immunity voltage-mode-control architecture and internal compensation without the need for external components. It achieves tight line and load regulation under the most demanding conditions of input voltage and loading, making it ideal for powering high frequency microcontrollers, DSPs, analogue ASICs, and other devices requiring high power and tight regulation. The device provides an industry standard footprint for easy replacement of legacy non-synchronous and linear regulators.

The AOZ1033AI features an adjustable switching frequency through the external Frequency-Set pin. The Frequency-Set pin is connected to ground or a resistor to set the switching frequency from 200kHz to 2MHz. If set to ground, the output is forced to 1MHz. A Synchronization pin enables the AOZ1033AI to cycle lock to an external clock or signal. This enables the effective separation of noise and current ripple between multiple converters in a system.

Overall, the AOZ1033AI is a robust, efficient and reliable solution with a design that meets the diverse needs of the electronics industry. The device offers a simple design and reduced component count, providing greater flexibility for system design and a lower overall cost. It is an ideal choice for applications that require high power, tight regulation and long life.

Device Features

The AOZ1033AI provides several features to help ensure a reliable and efficient system design. These include:

• Integrated high-side and low-side MOSFETs
• Wide input voltage range of 4.5V to 12V
• Adjustable output voltage down to 0.8V
• High noise immunity voltage-mode-control
• Integrated compensation without external components
• Tight line and load regulation
• Up to 95% peak efficiency
• Adjustable switching frequency from 200kHz to 2MHz
• Synchronization of multiple converters
• Industry standard footprint for easy replacement of legacy regulators
• Thermal shutdown protection

Working Principle

The AOZ1033AI is based on Digital Power System’s PMIC – Voltage Regulators – DC DC Switching Regulators. Its working principle involves switching between a high-side and a low-side MOSFET to regulate the output voltage. The AOZ1033AI is a voltage-mode-controlled DC-DC converter, meaning the control loop operates on the voltage difference between the feedback voltage and reference voltage. The AOZ1033AI supports a low ripple current operation, which is critical for high-frequency microcontrollers, DSPs and other devices requiring tight regulation.

Once the output voltage is set by an external resistor, the AOZ1033AI uses its high noise immunity voltage-mode-control architecture to regulate the output voltage. It then synchronizes the switching of the high-side and low-side MOSFETs to maintain the regulation. The timing of the switching is determined by the internal oscillator. The oscillator’s frequency is adjustable via a pin on the device.

The AOZ1033AI includes a soft-start feature that ramps the output voltage gradually to reduce inrush current and minimize component stress. It also includes thermal shutdown circuitry to protect the device from overheating. Finally, the AOZ1033AI supports synchronization with an external signal or clock, allowing multiple converters to be effectively separated for noise and current ripple.

Conclusion

The AOZ1033AI is a reliable and efficient PMIC – Voltage Regulators – DC DC Switching Regulators device designed to provide up to one amp of output current from a wide input voltage range. The device features integrated high- and low-side MOSFETs, wide input voltage range, adjustable output voltage, tight line and load regulation, and up to 95% peak efficiency. Additionally, its adjustable switching frequency, synchronization, industry standard footprint, and thermal protection features make it an ideal choice for applications that require high power, tight regulation, and long life.

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