Maxim’s new MAX16833 is a high-voltage HB LED driver for boost, buck-boost and buck configurations. The device’s architecture offers comprehensive short circuit protection, single-wire connection to LEDs and internal frequency dithering.
The device allows the design of more fault tolerant, reliable LED driver applications. Thanks to its wide input-voltage range, it can sustain battery load dump peaks up to 65 V during normal operation. The integrated high-side dimming p-channel MOSFET driver and high-side current-sense amplifier detect short-circuit events and protect the LEDs, the driver and the battery if those events occur. This short-circuit protection is provided between the output and ground, and also between the input and output. Additionally, this architecture allows a single-wire connection to the LEDs, thus reducing LED-to-driver wiring cost and complexity. The MAX16833 also includes output over-voltage and over-temperature protections, as well as a fault detection output.
Another feature is its internal frequency dithering, which improves EMI, thus easing the board designer’s task and reducing EMI filter component costs. The MAX16833B version of the driver does not include this frequency dithering, but instead features a ±2% accurate, 1,64 V reference voltage output that can be used by other devices on the driver board. Both versions are available in a thermally enhanced, 16-pin TSSOP package and are fully specified to operate over the -40°C to +125°C temperature range.
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