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The RT4501 is a high-efficiency LED driver for backlight applications. An asynchronous boost converter with an internal Schottky diode and a current source driver are designed to support 6LED/channel with wide input voltage range from 2.5V to 5.5V. An I<sup>2</sup>C interface can provide easy backlight control in fast and high speed mode. The RT4501 supports linear mappings with 256 steps to setup the brightness of backlight LEDs. It also supports PWM dimming to adjust the brightness. For brightness dimming, the RT4501 supports 128 steps pulse dimming which determines the LED current, and RT4501 support 256 steps PWM dimming which determines the LED current. The RT4501 provides complete protection functions such as input under-voltage lockout, over-current, output over-voltage and over-temperature protection. The OVP threshold voltage can be set at 16V and 25.5V for different applications. The RT4501 is available in the <br />WL-CSP-10B 0.87x2.07 (BSC) package.
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<div class="spec-list"><ul class="lv1"><li>Input Voltage Range : 2.5V to 5.5V </li><li>Internal Schottky Diode </li><li>Fast-speed mode I<sup>2</sup>C Compatible Interface </li><li>Drive Up to 7 WLEDs in 2 String </li><li>External PWM/Pulse Brightness Control </li><li>550k/1.1MHz Switching Frequency </li><li>Built-in Internal Soft-Start </li><li>PWM Dimming/Pulse Dimming Resolution 256/128 Steps </li><li>I<sup>2</sup>C Programmable 256 Steps Linear Current Regulation </li><li>Up to 85% Efficiency with Small Magnetics </li><li>Programmable 16V/25.5V OVP </li><li>Current Accuracy ±5% and Current Balance ±3% </li><li>UVLO, OVP, OCP, OTP Protection </li><li>Shutdown Current : < 1μA </li><li>Temperature Range : -40°C to 85°C </li><li>RoHS Compliant and Halogen Free </li></ul></div>
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<div class="spec-list"><ul class="lv1"><li>Cellular Phones </li><li>Digital Cameras </li><li>PDAs and Smart Phones </li><li>Portable Instruments </li></ul></div>
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