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The RT4539A is a high efficiency driver for white LEDs. It is suitable for single/two cell battery input to drive LED light bars which contains six strings in parallel. The internal current sinks support a maximum of ±2% current mismatching for excellent brightness uniformity in each string of LEDs. To provide enough headroom for current sink operation, the Boost converter monitors the minimum voltage of the feedback pins and regulates an optimized output voltage for power efficiency.The RT4539A has a wide input voltage operating range from 2.7V to 24V and contains I2C interface for controlling the dimming mode, operating frequency and the LED current. The internal 250mΩ, 39V power switch with current-mode control provides over-current protection. The switching frequency of the RT4539A is adjustable from 300kHz to 1.6MHz, which allows flexibility between efficiency and component size.The RT4539A are available in the WL-CSP-20B 1.71x2.371 (BSC) and WQFN-24L 4x4 packages.
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