RT7235GCP

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PMIC - Voltage Regulators - DC DC Switching Regulators

RT7235GCP is a Synchronous Step-Down regulator with an operating temperature between -40℃ and +125℃. It features low noise and high efficiency, allowing it to be widely applied in various sectors such as Battery Charging, Data Communications, Audio, Gaming, LCD Display and Automotives. Moreover, it supports dynamic voltage scaling, providing highly adjustable voltage outputs.

Key Features

• Wide Voltage Input Range: 2.6V - 6V
• Dynamic Voltage Scaling
• Low Output Ripple: 0.3mV @ 4A, 2.5V Output Voltage
• Wide Operating Temperature: -40℃ - +125℃
• High Efficiency up to 96%
• Low RDS(ON) at 25mΩ @ 4A Load
• Standby Mode with Low Supply Current: 0.3μA.

Application Field

RT7235GCP can be used in a variety of fields, including Charging, Data Communications, Audio, Gaming, LCD Display, and Automotives.

• Battery Charging: RT7235GCP can be used as a charger power supply, providing a stable DC output to charge the battery.
• Data Communications: RT7235GCP can be applied in application fields dealing with wired and wireless data transmission, such as Routers, WLAN and DSL.
• Audio: RT7235GCP can be used in audio applications to maintain a stable power supply which is crucial for audio quality.
• Gaming: RT7235GCP can also be used in gaming devices due to its fast transient reaction for dynamic voltage scaling.
• LCD Display: It is widely used in LCD displays because of its low ripple and high operating temperature.
• Automotives: RT7235GCP is also suitable for automotive applications such as ADAS, Car Audio, Mirror ECU, and Steer Control.

Working Principle

The current source mode of RT7235GCP is a constant frequency current mode control. When the voltage at the FB pin increases to 877 mV, the internal error amplifier changes the status from OFF to ON, and then turns On the driving switch. During the ON time of the switch, due to the output voltage error, the current source increases the switching frequency. On the other hand, the current source also has slope compensation, so that the peak current is determined by the inductor current during the ON period. When the output voltage meets the setting value, the slope and current ratio of the voltage error amplifier will be adjusted. When the inductor current decreases to the set level, the current source will be paused and enter the OFF state. The differential amplifier ensures that the current source is accuracy. The feedback circuit slices the inductor current to feedback the RI pin. Then, the ZCD pin is designed to compare the voltage of FB and RI pin. Whenever the difference voltage between them is higher than the lower and upper threshold voltage, the differential amplifier will produce a large current and control the driving switch between ON and OFF time. During the OFF time, the discharge switch will switch the output voltage to feedback input pin FB. This voltage will start to increase until detect the error amplifier continues to turn on the switch, therefore the regulating process goes on.

Conclusion

RT7235GCP is a Synchronous Step-Down regulator, which outperforms other regulators in terms of its low noise, high output ripple and low RDS(ON). It supports dynamic voltage scaling and has a wide voltage input range, making it suitable for a variety of applications, such as Charging, Audio, LCD Display, Gaming and Automotives. Moreover, its operating temperature is -40℃ to +125℃ and its current mode control ensures a stable power supply.

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