AUR9703AGH

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

AUR9703AGH Application Field and Working Principle

The AUR9703AGH is a fixed-frequency, peak current-mode, Pulse-Width Modulation (PWM) buck switching regulator IC with its application primarily in DC to DC converters. It controls the current flow in the external power MOSFET between its input and output pins, as required by the current control loop. This makes the AUR9703AGH a simple and powerful solution for low noise DC-DC switching regulators operating at a low input voltage.

Features

• Input voltage range: 4V to 20V
• Output voltage range: 0.75V – 17V, adjustable
• 14-pin, 3 × 3 QFN package
• High efficiency, up to 96%
• High current load capability, up to 3.6A
• Programmable frequency up to 500KHz
• Integrated soft start, over-current and overtemperature protection

Application Field

The AUR9703AGH supports a wide range of input and output voltage ranges, enabling designers to apply this device in applications such as DC-DC buck converters that generate low voltages such as 0.75V or 3.3V, or in situations requiring a multiple-output design that supplies several load currents in parallel. The device is also convenient for applications requiring a low standby current. That is, at about ns after the power-on, the AUR9703AGH will enter into a low power state, in which the total power consumption is only microamperes.

The AUR9703AGH can be used in a variety of DC to DC applications, including USB, telecommunications, IT infrastructure, automotive and consumer electronics.Examples include power conversion in displays, battery charging, power management in portable devices, and efficient power conversion in desktop computer CPU and memory.

Working Principle

The AUR9703AGH operates as a constant width pulse-operated power transistor. It requires a low duty cycle PWM signal, typically generated by a PWM controller. The PWM signal will switch the power MOSFETs, creating a path between the input and output terminals. As a result, the input voltage will, after a conversion process, become the output voltage. The AUR9703AGH is designed with a peak current mode for fast loop response. The device uses both the inductor current and the PWM signal to regulate the output voltage.

The current control loop receives the output voltage feedback from the output pin of the AUR9703AGH and compares it against a reference voltage. If a difference is present, the error amplifier adjusts gate voltage of the internal MOSFETs. For instance, if the output voltage is higher than desired, the gate voltage is lowered. This reduces the width of the pulse and in turn reduces the inductor current, thus lowering the output current and the output voltage.

Conclusion

The AUR9703AGH integrates all the features required for a simple, yet powerful, low noise switching regulator topology. This includes integrated soft start, over-current and overtemperature protection. It has a wide input voltage range surge capability that spans 4V to 20V, enabling it to be used in a wide variety of DC-DC applications, including those of USB, telecommunications, IT infrastructure, automotive, and consumer electronic nature.

The specific data is subject to PDF, and the above content is for reference