5 Dot Led Level Meter

The Allegro A8732 is a Xenon photoflash charger integrated circuit (IC) specifically designed for ultra-low power, compact cameras, especially in mobile devices such as camera phones. It utilizes primary-side voltage sensing, which eliminates the need for a secondary-side resistive voltage divider, thereby reducing leakage currents on the secondary side of the transformer. To enhance battery longevity, the A8732 operates with an extremely low supply current draw, with a maximum of 0.5 µA in shutdown mode. The switch current limit can be programmed from 0.45 A to 1.5 A in 16 steps using a single-wire interface through the CHARGE pin. The integrated gate driver includes internal gate resistors, minimizing the required external components. The charge and trigger voltage logic thresholds are established at a minimum of 1 VHI to accommodate applications that utilize low-voltage control logic. The A8732 is housed in an 8-contact 2 mm x 2 mm DFN/MLP package, featuring a maximum overall height of 0.60 mm and an exposed pad for improved thermal performance. It is lead-free with 100% matte tin leadframe plating, manufactured by Allegro MicroSystems, Inc.

The Allegro A8732 Xenon photoflash charger IC is engineered to optimize performance in compact camera applications, particularly in mobile devices where space and power efficiency are critical. The primary-side voltage sensing mechanism is a notable feature that enhances the overall efficiency of the charging circuit by negating the need for additional resistive components that could introduce inefficiencies and increase the circuit's footprint.

The low supply current draw of 0.5 µA in shutdown mode ensures minimal battery drain when the device is inactive, a crucial factor for portable devices that rely on battery power. The programmable switch current limit allows for flexibility in design, accommodating various application requirements by providing the ability to adjust the charging current in 16 distinct steps. This feature is particularly beneficial in applications where different flash intensities are needed.

The internal gate resistors within the IGBT driver simplify the design process by reducing the number of external components required, thereby streamlining the overall circuit layout. The defined charge and trigger voltage logic thresholds at a minimum of 1 VHI enable compatibility with low-voltage control logic, making the A8732 suitable for integration with modern microcontrollers and digital signal processors.

The compact DFN/MLP package design not only saves space but also incorporates thermal management features through the exposed pad, which aids in heat dissipation during operation. The lead-free construction with matte tin plating aligns with environmental standards, making the A8732 a responsible choice for manufacturers focused on sustainability. Overall, the A8732 represents a sophisticated solution for achieving efficient and reliable photoflash charging in small electronic devices.The Allegro ® A8732 is a Xenon photoflash charger IC designed to meet the needs of ultra low power, small form factor cameras, particularly camera phones. By using primary-side voltage sensing, the need for a secondary-side resistive voltage divider is eliminated.

This has the additional benefit of reducing leakage currents on the secondary side o f the transformer. To extend battery life, the A8732 features very low supply current draw (0. 5 A max in shutdown mode). The Switch current limit CAN be programmed from 0. 45 to 1. 5 A, in 16 steps with single wire Interface through the CHARGE pin. The IGBT driver also has internal Gate resistors for minimum external component count. The charge and trigger voltage Logic thresholds are set at 1 VHI (min) to support applications implementing low-voltage control Logic The A8732 is available in an 8-contact 2 mm G— 2 mm DFN/MLP package with a 0. 60 maximum overall package height, and an exposed pad for enhanced thermal performance. It is lead (Pb) free with 100% matte tin leadframe plating. By Allegro MicroSystems, Inc. 🔗 External reference