RT7247CHGSP

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The RT7247CHGSP is a highly integrated current-mode DC-DC switching regulator, developed to suit a wide range of applications such as LED flash drives, portable digital products and battery charger applications. It integrates a high-efficiency integrated regulator and an integrated series inductor dropout linear regulator, which can reduce the overall design complexity by reducing out-of-pocket components and facilitate the development of small form-factor power management applications.

RT7247CHGSP has integrated current-mode control, which enables optimal low noise operation and fast transient response. It also features a wide range of programmable characteristics, allowing the designer to tailor the output current and voltage depending on the application. Furthermore, the built-in protection circuitry ensures the safe operation and reliability of the device, making it suitable for various applications.

RT7247CHGSP is available in 2A and 4A current ratings and has an adjustable switching frequency from 120KHz to 500KHz. It also offers a wide input voltage range of 3V to 5.5V, making it suitable for a wide range of applications. Moreover, the built-in PFM/PWM auto-skip function improves the efficiency of the device at light-load and lower input voltage, making it ideal for battery-powered applications.

The working principle of the RT7247CHGSP is based on a current-mode control system which uses a single-ended primary inductor converter (SEPIC) topology. This topology enables the device to have bidirectional input voltage polarity, allowing it to be used for battery charging application. The RT7247CHGSP utilizes a reference voltage based on a voltage divider to regulate the output current in order to maintain a constant voltage. The high-side switch and the low-side switch are used for power regulation as well as for controlling the output current and voltage.

When the input voltage varies, the RT7247CHGSP output current is regulated through a sampling current through the low-side MOSFET switch. The current mean value is tracked by a feedback loop and amplified by an error amplifier to drive the high-side MOSFET switch and the low-side MOSFET switch. The voltage comparator allows the device to balance the input voltage with the output voltage in order to prevent over-charging or under-charging.

In addition, the device integrates an internal PWM/PFM auto-skip control circuitry which can reduce the switching loss and improve the efficiency of the device at light-load conditions. The device also features over-temperature protection, under-voltage lock-out protection, and over-voltage protection to ensure the safe operation of the device.

The RT7247CHGSP can be used for various applications such as LED flash drives, portable digital products, and battery charger applications. It is a highly integrated device, offering a wide range of programmable characteristics, PFM/PWM auto-skip control circuitry, and a wide range of protection features, making it suitable for these applications.

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