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.
Applications
- Automotive Infotainment Displays
- Automotive Instrument Clusters
- Heads-Up Displays