MAX20098ATEF/V+

Power management integrated circuits (PMICs) play a significant role in providing a safe, efficient and reliable interface between the energy source and the load, mainly LED drivers. LED drivers, in particular, are a subset of PMICs that must be integrated into LED backlighting, LED lighting and other PLED-controlled applications, and need to provide efficient and reliable power for LED, OLED and PLED driving. The MAX20098ATEF/V+ is a PMIC-LED driver that offers efficiency, programmability and integrated fault reporting.

Overview of MAX20098ATEF/V+

The MAX20098ATEF/V+ is a 1MHz buck LED driver designed specifically to support LED backlighting and LED lighting applications. The device enables highly efficient current and dimming control, while providing a versatile user interface. Advanced features such as transient fault protection and output voltage sequencing allow the device to suit a wide range of application needs. The MAX20098 also offers an integrated high-side current sense FET, allowing the device to effectively measure current for diagnostic and dimming capabilities. The device has an integrated voltage feedback loop for simultaneously ramping a low and high side current, resulting in fast and uniform dimming response.

Features of MAX20098ATEF/V+

The MAX20098ATEF/V+ provides multiple integrated and external components that allow it to deliver both high performance and flexibility. It offers a wide range of features, including:

• Programmable switching frequency, allowing optimization for noise and performance.
• Wide input voltage range for 10V to 42V supply, with state programmable over voltage protection and low battery dropout protection.
• Dual current-mode control with peak current mode, synchronous rectification, and transient fault protection.
• Integrated high and low side current sensing FETs with 1mOhm on resistance, providing high current measurement accuracy.
• Output voltage sequencing for controlling the turn-on and turn-off timing sequence.
• Integrated fault-reporting capability for diagnostics.

Application Field and Working Principle

The MAX20098ATEF/V+ is designed for use as a buck-mode LED driver that can drive one or two strings of LEDs with up to 50mA of current in each string. It is suitable for use in a wide range of applications, including LCD backlighting, camera modules, automotive lighting, battery-powered lighting and more. The device provides both current-mode control and voltage control, allowing it to operate with a high degree of accuracy and efficiency.

The device works on an Buck converter topology. The Buck converter is a DC-to-DC converter circuit used to convert one regulated output voltage from a higher input voltage. It operates by switching a transistor on and off which effectively charges an inductor then discharges it, thus creating a current pulse that is inversely proportional to the duty cycle of the voltage. The output voltage is then regulated by controlling the on-off switch of the transistor and adjusting the inductor\'s current.

Conclusion

The MAX20098ATEF/V+ is a PMIC-LED driver designed to support LED backlighting and LED lighting applications. It offers programmable switching frequency, wide input voltage range, dual current-mode control with peak current mode, synchronous rectification, and transient fault protection. The device also offers integrated high and low side current sensing FETs, output voltage sequencing and fault-reporting capabilities, allowing it to deliver high performance and flexibility. The device works on a Buck converter topology and can provide efficient and reliable power for LED, OLED and PLED driving.