RT9261-33GB

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RT9261-33GB Application Field and Working Principle

RT9261-33GB is a synchronous buck/boost DC-DC switching regulator designed by Richtek Technology Corporation. It is categorized under PMIC – Voltage Regulators – DC DC Switching Regulators. The DC-DC switching converter has an adjustable output voltage, which can provide a stable output voltage over a wide input voltage range of 1.8V to 6V.

The RT9261-33GB can be used in a wide range of applications such as communications, consumer, mobile and computing. The device is designed to provide regulated voltage and current supply to the processor and other non-volatile memories and low power peripherals in mobile and portable electronic devices, such as cellular phones, personal digital assistant (PDA), laptop, MD players and so on. In these applications, the devices can be used as the main power or back-up power source. To reduce the power dissipation, the device also supports a low quiescent current mode.

Operating Principle

The RT9261-33GB is a synchronous buck boost DC-DC switching converter, which can provide a stable output voltage over a wide input voltage range of 1.8V to 6V. The device uses a switching topology to convert the input voltage to the output. It provides a wide range of output voltages, which are adjustable via an external voltage divider. The RT9261-33GB features a soft-start function that can minimize output overshoot.

Control Loop

The RT9261-33GB uses a pulse width modulation (PWM) control scheme to control the output voltage. The PWM control scheme consists of an error amplifier, an upper and lower comparator, and an adjustable reference. The error amplifier monitors the output voltage and compares it to the adjustable reference voltage. If the output voltage is lower than the reference voltage, the comparator output goes high, turning on the internal power MOSFET and causing the output voltage to rise. If the output voltage is higher than the reference voltage, the comparator output goes low, turning off the internal power MOSFET and causing the output voltage to drop.

Protection

The RT9261-33GB provides several protection features to protect the device and the system. These include over voltage protection, under voltage protection, over current protection, over temperature protection and input UVLO protection. The device also includes a thermal shutdown circuit to prevent the device from being damaged due to excessive heat.

Package

The RT9261-33GB is available in an 8-pin SSOP-8 package. The pinout for the device is as follows:

• VIN – Input voltage
• GND – Ground
• EN – Enable pin
• SYNC – Synchronization pin
• FB – Feedback voltage
• VREF – Reference voltage
• CS – Current sensing
• VOUT – Output voltage

Conclusion

The RT9261-33GB is a synchronous buck boost DC-DC switching converter designed by Richtek Technology Corporation. It is used in a wide range of applications in communications, consumer, mobile and computing. The device is designed to provide regulated voltage and current supply to the processor and other non-volatile memories and low power peripherals in mobile and portable electronic devices. It features a wide input voltage range of 1.8V to 6V and adjustable output voltage via an external voltage divider. The device includes various protection features and is available in an 8-pin SSOP-8 package.

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