MAX20446ATG/V+T

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MAX20446ATG/V+T is a PMIC (Power Management Integrated Circuit) that specializes in LED Drivers. This IC provides a high-efficiency boost converter with step-down Regulation (CSTEP) to drive white or RGB LEDs in high power applications. It also supports a WLED flash feature that enables mobile devices to quickly and reliably capture photography. The device is designed and configured to drive LEDs in a wide range of functions and uses, including flash, laser combiners and general lighting.

Overview of the MAX20446ATG/V+T

The MAX20446ATG/V+T is a highly integrated device offering high performance, low cost, and low power consumption. The converter contains a dedicated single-stage converters and linear regulator for output regulation, allowing for accurate LED current control and regulation. Its unique CSTEP technology allows for high efficiency LED current regulation over wide LED current ranges. The device has an abundant range of features including integrated voltage feedback, adjustable output voltage, PWM dimming, and advanced soft start.

The MAX20446ATG/V+T integrates a linear regulator, a high switching frequency boost DC-DC converter, a 9-channel pulse-width modulator (PWM) dimmer, and two WLED blink controllers into a single package. A wide input voltage range of 2.7V–5.5V makes the LED driver suitable for both dual and single cell battery systems. The device’s fixed frequency, current mode, boost DC-DC architecture provides accurate output current regulation, which is essential for creating high quality LED lighting.

Application Field and Working Principle

The MAX20446ATG/V+T is ideal for high power applications such as flash and general lighting for mobile devices, indoor and outdoor applications. It is simple to use and provides reliable performance for such applications as automotive, consumer, and portable lighting. The vendor provides a comprehensive evaluation kit, shortcut design checker, and thermal model for easy evaluation, design and testing. The device’s controlled switching architecture is compatible with external wired, inductor-DC-DC, and buck-boost led drivers.

The MAX20446ATG/V+T works by using a voltage feedback configuration to regulate the output current. The device achieves an output current accuracy of ±2% without the need of an external current sense resistor. The boost DC-DC converter is configured as a two-phase interleaved design, which works by switching two sets of equal-value inductors in sequence. The two sets of inductors are switched out of phase, hence creating an interleaved boost which reduces switching losses and increases the efficiency.

The linear regulator works by setting a specific output current level and using an internal voltage feed-back loop to limit the voltage output. The WLED blink controller sets the brightness of the LEDs by varying the duty cycle of the PWM signal. The dimmer block supports PWM dimming from 0% to 100%, which allows for smooth brightness control with no flicker.

Conclusion

The MAX20446ATG/V+T is an ideal LED driver for high power LED applications such as flash and general lighting for mobile devices. It is a highly efficient and feature-packed single package solution that offers high performance, low cost, and low power consumption. Its unique CSTEP technology provides excellent LED lighting with accurate current regulation over a wide current range. Additionally, it also supports advanced features such as PWM dimming, WLED blink control, and robust thermal shutdown protection.

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