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The RTQ4551-QT is a 6-channel LED driver capable of delivering 200mA for each channel with a DC-DC controller. The current-mode switching DC-DC controller supports boost or SEPIC topologies and operates in the 300kHz to 2.2MHz frequency range. The device accepts a wide 3V to 40V input voltage range and withstands direct automotive cold crank and load-dump events. The internal current sinks support a maximum of 3.5% current accuracy and mismatching for excellent brightness uniformity in each string of LEDs. The RTQ4551-QT automatically detects and disconnects any unconnected and/or broken strings during operation from control loop to prevent VLED from overvoltage. To provide enough headroom for current sink operation, the boost controller monitors the minimum voltage of the LEDx pins and regulates an optimized output voltage for power efficiency. The RTQ4551-QT has a standard I<sup>2</sup>C digital interface for functional settings. Moreover, the boost switching and PWMO frequency can be programmed by external resistors or the I<sup>2</sup>C interface. Comprehensive diagnostic information is also available through the I<sup>2</sup>C interface. When an abnormal situation occurs, a status signal will be sent to the system.The RTQ4551-QT is available in a 38-pin VDFN package and operates within a temperature range of -40°C to 125°C.
3
RTQ4551-QT Typical Circuit
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<div class="spec-list"><ul class="lv1"><li>Wide Operating Input Voltage: 5V to 40V - Support Cold Crank Down to 3V Supply After Start-Up </li><li>High Output Voltage: Up to 45V </li><li>NMOS or PMOS Input Protection Switch </li><li>Integrated Boost and SEPIC Controller for LED Driver - Switching Frequency: 300kHz to 2.2MHz - Spread Spectrum for Reduced EMI - Automatic Output Voltage Discharged When Controller Is Disabled - Sync Input to Set Switching Frequency from an External Signal </li><li>6-Channel Current Sinks with 30mA to 200mA per Channel </li><li>Channel Current Regulation with Accuracy ±3.5% and Matching 3.5% </li><li>Up to 16-Bit Dimming Resolution with I<sup>2</sup>C or PWM Input </li><li>Programmable Multi-Dimming Operation Mode - Up to 16-Bit PWM and Mixed Dimming Resolution - Up to 12-Bit DC Dimming Resolution </li><li>Dimming Ratio 32000:1 in PWM Mode Using a 152Hz Output PWM Frequency </li><li>Dimming Ratio 4000:1 in DC Mode </li><li>Advanced Slope Function for Smooth Dimming </li><li>Phase-Shift PWM Mode Reduces Audible Noise </li><li>Adaptive Headroom Control Method to Optimize Output Voltage for Power Efficiency </li><li>Protections - LED Open and Short Fault - Boost OCP, OVP, and UVP Protection - VIN OVP, OCP, and UVLO Fault - Warming and Over-Temperature Protection - FSET Pin Short Detection Protection - Extensive Fault Diagnostics and Fault Indicator Signal Output </li><li>Embedded Memory with MTP </li><li>AEC-Q100 Grade 1 Qualified </li><li>Ambient Temperature Range: -40°C to 125°C </li><li>Junction Temperature Range: -40°C to 150°C </li></ul></div>
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<div class="spec-list"><ul class="lv1"><li>Automotive Infotainment Displays </li><li>Automotive Instrument Clusters </li><li>Heads-Up Displays </li></ul></div>
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