SP6336 SP6336 -Triple Micropower Supervisory Circuit With Watchdog And Power Fail

Introduction The SP6648 integrated synchronous boost regulator is a compact circuit that provides ultra-high efficiency drive current for an LED flashlight using a Luxeon I light source. The circuit is configured to deliver a constant output current of 350mA for a two-cell alkaline battery application. All components are compact surface mount devices, resulting in a tiny final solution. Diode D1 has been included to reduce the effective feedback voltage from 1.25V down to 0.61V to enhance efficiency. The LED current can be programmed up to 900mA depending on the selected resistor value. The operating quiescent current of the component is only 12µA, which means that only a negligible amount of power is consumed by the regulator itself. The SP6648 is available in an MSOP package for easy pin access during prototyping and testing, as well as in a 3x3mm DFN package for the smallest production circuit.

The SP6648 synchronous boost regulator is designed for high-efficiency applications, particularly in portable LED lighting solutions. The regulator's architecture allows it to step up the voltage from a two-cell alkaline battery configuration, ensuring that the Luxeon I LED receives a stable and sufficient current for optimal brightness. The circuit's design includes a feedback mechanism facilitated by diode D1, which effectively lowers the feedback voltage, thereby enhancing overall efficiency.

The flexibility of the SP6648 allows for output currents to be adjusted based on the external resistor configuration, making it suitable for various applications requiring different brightness levels. The ability to program the LED current as high as 900mA provides versatility in design, accommodating different LED specifications and user requirements.

With a quiescent current of just 12µA, the SP6648 is particularly advantageous in battery-operated devices, where power conservation is critical. This low power draw ensures extended battery life, making it an ideal choice for portable applications.

The choice of package types, namely the MSOP and 3x3mm DFN, provides designers with options for ease of prototyping and space-constrained production environments. The MSOP package facilitates straightforward access to pins for testing, while the compact DFN package is optimized for high-density circuit layouts, contributing to the miniaturization of electronic designs.

Overall, the SP6648 integrates efficiency, programmability, and compactness, making it a valuable component in the development of modern LED lighting solutions.Introduction The SP6648 integrated synchronous boost Regulator is a compact circuit that provides a ultra- high efficiency drive current for an LED flashlight using a LuxeonTM I light source. The circuit shown below is configured to provide 350mA constant output current for a two cell alkaline battery application.

All components are compact surfac e mount devices, yielding a tiny final solution. Diode D1 has been added to reduce the effective feedback voltage from 1. 25V down to 0. 61V to improve efficiency. The LED current CAN be programmed as high as 900mA depending on the set resistor value. Operating quiescent current of the part is only 12uA, so only a negligible amount of power is used by the part itself. The SP6648 is available in MSOP for easy pin access in proto- type and testing, and also 3x3mm DFN for the smallest production circuit.

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