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The RTQ4554-QT is a 4-channel LED driver capable of delivering 170mA 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 RTQ4554-QT automatically detects and disconnects any unconnected and/or broken strings during operation from the 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 RTQ4554-QT has a standard I2C digital interface for functional settings. Moreover, the boost switching and PWMO frequency can be programmed by the I2C interface. Comprehensive diagnostic information is also available through the I2C interface. When an abnormal situation occurs, a status signal will be sent to the system.The RTQ4554-QT is available in a 24-pin WQFN package and operates within a temperature range of -40°C to 125°C.
Wide Operating Input Voltage: 5V to 40V ► Support Cold Crank Down to 3V Supply After Start-Up
High Output Voltage: Up to 45V
NMOS or PMOS Input Protection Switch
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
4-Channel Current Sinks with 30mA to 170mA per Channel
Channel Current Regulation with Accuracy ±3.5% and Matching 3.5%
Up to 16-Bit Dimming Resolution with I2C or PWM Input
Programmable Multi-Dimming Operation Mode ► Up to 16-Bit PWM and Mixed Dimming Resolution ► Up to 12-Bit DC Dimming Resolution
Dimming Ratio 32000:1 in PWM Mode Using a 152Hz Output PWM Frequency
Dimming Ratio 4000:1 in DC Mode
Advanced Slope Function for Smooth Dimming
Phase-Shift PWM Mode Reduces Audible Noise
Adaptive Headroom Control Method to Optimize Output Voltage for Power Efficiency
Protections ► LED Open and Short Fault ► Boost OCP, OVP, and UVP Protection ► VIN OVP, OCP, and UVLO Fault ► Warming and Over-Temperature Protection ► Extensive Fault Diagnostics and Fault Indicator Signal Output
Embedded Memory with MTP
AEC-Q100 Grade 1 Qualified
Ambient Temperature Range: -40°C to 125°C
Junction Temperature Range: -40°C to 150°C
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