AOZ1605DI

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AOZ1605DI is a highly-efficient, synchronous buck DC-DC converter that is part of AOZ16XX family of monolithic, single-channel, high-efficiency, synchronous buck DC-DC converters. The device integrates two MOSFETs, a current sensing circuit, a voltage reference and control logic in a single package. It controls the current through its integrated MOSFETs along with the input voltage to deliver power to the output terminal. The AOZ1605DI is designed to operate from 4.5V to 18V and provides output current of up to 4 A, suitable for point-of-load applications.

Application Field

The AOZ1605DI is ideally suited for applications in consumer, personal communication and other battery-powered equipment. It is ideal for portable systems, motherboards, gaming applications and other portable computing equipment. It is also used to provide power conversion in various industrial and automotive applications.

Working Principle

AOZ1605DI works with an internal bi-directional buffer. During the continuous operation, it stores the output voltage reference and fed it to the high side and low side MOSFETs through the bi-directional buffer. The reference comparator compares the stored output voltage with the voltage supplied from the low side MOSFETs to adjust the gate of the MOSFET and control the current flow. This ensures that the switching frequency remains constant and the output voltage remains stable. The current sensing circuit senses the current flowing through the MOSFETs for closed loop feedback, which improves the efficiency of the output voltage regulation.

For DC-DC applications, the AOZ1605DI can be used as a synchronous buck or synchronous boost converter. The output voltage of the converter can be varied from 0.9V to the input voltage (V_IN), and an optional external resistor divider network can be used to adjust the internal voltage reference. The current sensing circuit can be enabled and disabled by controlling the IN pin with PWM signal, and the switching frequency is adjustable from 200kHz to 1.25MHz.

The AOZ1605DI features protection features including under-voltage lockout (UVLO), over-temperature shutdown (TSD), over-current protection, and overload protection. The device’s integrated shutdown control, power-on reset circuitry, and soft-start all help to protect the system from damage. A voltage range of 4.5V to 18V makes it easy to configure the device in various applications.

In summary, AOZ1605DI is a highly-efficient and reliable synchronous buck DC-DC converter. Its integrated current sensing circuit, voltage reference, and control logic make it an excellent choice for point-of-load applications in various consumer, personal communication and other battery-powered equipment. It operates over a wide input voltage range of 4.5V to 18V and provides output current of up to 4A. It also features various protection features including under-voltage lockout, over-temperature shutdown, over-current protection, and overload protection.

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