Choose the three key charge pump

The white LED driver market is booming, with chip suppliers engaged in fierce competition. To stay ahead, they have developed advanced charge pump solutions that now hold a significant position in the industry. These charge pumps are capable of delivering higher backlight power, meeting the growing demands of larger and more complex color displays in portable and wireless devices. Additionally, manufacturers are promoting backlight panels that better match the brightness levels of LEDs with the performance of the driving chips. However, OEMs are primarily focused on improving the efficiency of switched-capacitor (charge-pump) power supplies, as well as optimizing the performance of boost converters to achieve better balance. Charge pumps are typically used for driving parallel-connected LEDs, while boost converters are more common for series or series-parallel configurations. Charge pump devices are favored for their compact size, making them a top choice for major OEMs. Beyond their versatility across applications, an indirect reason for their popularity is the perception that inductor-based power supplies may cause serious EMI issues. In reality, modern charge pump topologies are quite common, and the differences between chips often come down to subtle design improvements tailored for specific applications, giving users a competitive edge. Tony Armstrong, Product Sales Manager at Linear Technology’s Power Division, stated, "Today's devices must have both a primary and secondary display, with at least one RGB display for backlighting." He highlighted the expanding design requirements. The company recently launched the LTC3206, a charge pump designed for such applications. He emphasized that current accuracy—how closely the LED average current matches the expected value—is crucial, but the matching accuracy between different LED current sources is even more challenging. While customers are satisfied with 10% current accuracy, they often express concerns about matching accuracy exceeding 5%. Additionally, he pointed out that another overlooked factor is overall system efficiency, especially the ratio of battery direct-on-time versus charge-on-time when operating in a 1.5x or 2x voltage boosting mode as the input voltage drops. This aspect is critical for maintaining performance and extending battery life in modern devices.

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