MAX8901BETA+TCH8

Introduction

MAX8901BETA+TCH8 is a PMIC (Power Management IC) for LED drivers that combines a high-voltage boost regulator and an adaptive dimming control to provide a constant current output to the load. The IC integrates the functions of voltage boosting and power conditioning, together with an optional high-current output, in a single package. It is suitable for driving low-power LED modules for general-lighting applications, industrial lighting, and automotive lighting.

The Technology behind the MAX8901BETA+TCH8

The MAX8901BETA+TCH8 uses a synchronous buck architecture to achieve maximum efficiency.The IC employs a two-stage current regulation which monitors the LED current and adjusts the voltage offered to the LED elements to maintain a target current. The first stage is a local current sense amplifier which controls the output switch of the power stage and sets up the output voltage. The second stage is a remote current sense amplifier which monitors the LED current and derives the current error signal.

The MAX8901BETA+TCH8 also employs a unique adaptive dimming control feature that adjusts the output voltage up and down depending on the loading. This provides an additional means by which to control the LED current and brightness level. The adaptive dimming control can be used in conjunction with a PWM dimming signal.

Applications

The MAX8901BETA+TCH8 is used in a wide variety of LED driver applications, including general-lighting applications, industrial lighting, and automotive lighting. The IC is suitable for driving low-power LED modules from a 6 to 24V input. Its current regulation feature enables the LED current to be accurately maintained at a specified level, providing improved LED lifetime and consistent color uniformity. The high switching frequency allows the LED module size to be reduced and the effectiveness of the heat sink minimized. The adaptive dimming control feature offers additional control over the LED current, allowing the dimming response to be tailored to the application.

Conclusion

The MAX8901BETA+TCH8 is a highly-integrated PMIC designed for LED driver applications. It combines boosting and power conditioning with an optional high-current output, while providing two-stage current regulation and adaptive dimming control. The PMIC reduces component count and PCB size in LED driver applications, improves system efficiency, and offers excellent dimming response. The MAX8901BETA+TCH8 is suitable for driving low-power LED modules from a 6 to 24V input.