Introduction

The RT9169-28GV is a linear voltage regulator IC specifically designed to provide excellent line and load regulation in applications such as DC-DC converters, digital circuits, power supplies and other power management applications. It is easy to use and provides designers flexibility and design simplicity over traditional linear regulators. The integrated features of the RT9169-28GV enable a comprehensive power management solution.

Application Field

The RT9169-28GV is suitable for use in a wide range of applications including digital, wireless, multimedia and telecom systems, providing fast transient response and low-noise operation. As single-cell or multi-cell switching regulators, these devices are capable of supplying simultaneously up to five outputs. They can also be used for powering low-power, high-voltage applications such as electronic toys, battery chargers and other portable applications. The RT9169-28GV is capable of delivering up to 5A continuous load current output over a wide range of output voltage ranges.

Working Principle

The RT9169-28GV is a monolithic voltage regulator with a wide input voltage range of 2.3V to 28VDC. The output voltage is adjustable between 1.5V and 28V, and it operates with a current limit of 5A (750mA typical). The device is available in an 8-pin SOIC package, and features voltage sense inputs and an error amplifier that allow the device to be customized to the user’s application requirements. The RT9169-28GV employs a Voltage Regulating Mode (VRM) control architecture to ensure tight regulation, good line and load regulation, and fast transient response. The wide input voltage range of the device enables it to be used in both fixed and adjustable applications.

The RT9169-28GV uses a feedback loop to regulate the output voltage. At the input, the voltage is compared to the feedback voltage at the reference pin, and the error signal is amplified by an error amplifier within the device. This amplified error signal is then used to control the current source, which adjusts the voltage applied to the output transistor. The current source is also connected to a compensation network that tunes the device for optimum transient response. The RT9169-28GV also features an internal low-dropout voltage, a soft start circuit to reduce output voltage overshoot, and an undervoltage lock-out (UVO) circuit to prevent the device from entering an invalid operating state.

Conclusion

The RT9169-28GV is an ideal device for regulating wide range of voltage outputs in applications where power efficiency, size and flexibility are primary considerations. The device can provide excellent line and load regulation, wide input voltage range, and fast transient response. The integrated features, such as the UVO, soft start, voltage sense inputs, and compensation network, enable the RT9169-28GV to be tailored to the design requirements.