ISL97635IRZ

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The ISL97635IRZ is a low quiescent current buck-boost DC/DC converter with integrated FETs designed for automotive and industrial applications. It contains all the functions necessary to drive high-current LEDs efficiently while providing the flexibility to optimize system performance and efficiency. It can drive up to 6 LEDs in series at up to 5A per LED, with selectable light current through digital controls. In addition to its LED driving functions, the chip includes three integrated gate drivers, two for a synchronous buck or synchronous buck-boost, and one for an asynchronous boost, as well as several other features. This makes it an ideal choice for LED applications with variable LED current and wide input voltage range requirements.

The ISL97635IRZ is a PMIC (power management IC) LED driver, and its working principle is related to buck-boost conversion. It contains two operational functions, buck (step-down) and boost (step-up). In buck mode, the chip supplies a regulated output voltage by stepping down the input voltage, while in boost mode, the output voltage is greater than the input voltage. Depending on the input and output voltage requirements, both buck and boost mode can be active at the same time, allowing the chip to work in buck-boost conversion. A typical buck-boost converter is shown in Fig. 1.

Fig. 1: A typical buck-boost converter

In addition to buck-boost conversion, the ISL97635IRZ also features other functions for LED driving applications, such as PWM dimming for flicker-free operation, over-temperature protection, and a high-speed oscillator for near-constant light current regulation. Additionally, it provides protection against over-voltage, over-current, and EMI, making it a robust and reliable solution for LED driving. This allows the ISL97635IRZ to be used in a variety of automotive, industrial, and other high-intensity LED applications, such as in automotive headlights, indicator lights, backlighting, and more.

The ISL97635IRZ also offers several digital controls to power the LEDs. For example, the chip contains registers to set the PWM frequency and duty cycle for easy dimming control, as well as registers to set the light current, allowing users to adjust the LED intensity without having to change the external components. In addition, it provides a digital enable pin to turn on/off the power supply. This makes the ISL97635IRZ a great choice for applications that require digital controls for LED driving.

Overall, the ISL97635IRZ is a powerful and versatile LED driver for automotive and industrial applications. It combines buck-boost conversion, PWM dimming, LED current setting, and other features in a small package, making it ideal for use in a variety of LED driving applications. Its features, combined with its low quiescent current and small package size, make it a great choice for applications that require efficient, low-power LED driving.

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