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PMIC - LED Drivers

AAT1271AIWO-T1 is an integrated step-down DC-DC converter from Analogic Technologies, specifically designed for driving high-power LEDs. It offers a small size and high performance to low power consumption ratio, as well as excellent efficiency and fast transient response for driving high current LED strings.

Application Field

The AAT1271AIWO-T1 LED driver is ideal for backlighting applications, such as LCD LCD panels and LED displays. It can be used in conjunction with a microcontroller or a constant voltage source to provide a wide range of power to the LED strings, from a few watts up to hundreds of watts. It is also suitable for automotive, medical, industrial and consumer lighting applications.

Working Principle

The AAT1271AIWO-T1 is a synchronous Buck DC-DC converter, which means that the switching frequency is synchronized with the input voltage. This feature has the advantage of achieving higher efficiency than traditional switch-mode architectures, and is also more immune to EMI. The maximum switching frequency is 500kHz, which means that the converter can respond faster to input voltage changes.

The AAT1271AIWO-T1 includes a voltage step-down controller, together with an On-Board MOSFET, to provide a complete and self-contained switching solution. The MOSFET has very low RDS ON , typically 8.5mΩ, allowing to drive high-current LEDs without loss of efficiency or performance.

The AAT1271AIWO-T1 is adjustable from 0.9V to 6V when using an external voltage sources, as well as having 5 internal preset levels of 3.2V, 3.4V, 3.6V, 4.2V and 4.8V. The internal presets are selectable via the dedicated shutdown input pin. The AAT1271AIWO-T1 also supports Power Factor Correction (PFC) up to 97% to maximize power efficiency.

The AAT1271AIWO-T1 includes current limiting, as well as overvoltage, undervoltage and overtemperature protection. An additional protection feature is the “soft-start”, which can avoid inrush currents at startup. The device features a low quiescent current of typically 0.6mA in shutdown mode.

Conclusion

The AAT1271AIWO-T1 is an integrated high-efficiency Buck DC-DC converter specifically designed for driving high current LED strings. It offers very high efficiency, excellent transient response and fast current limiting, as well as adjustable output voltage and support for PFC up to 97%. It is also feature-packed with protection features such as overvoltage, undervoltage and overtemperature protection, as well as a low quiescent current in shutdown mode. The AAT1271AIWO-T1 is an ideal solution for driving high-power LEDs in applications such as LCD panels and LED displays.

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