RT8577A Datasheet | Richtek

Description The RT8577A is an 4-CH LED driver capable of delivering 120m A for each channel. The RT8577A is a current mode boost converter with an adjustable switching frequency via the RT pin from 200k Hz to 2.1MHz and a wide VIN range from 5.5V to 40V. The PWM output voltage loop selects and regulates the LED pin with the highest voltage string to 0.6V, hence allowing voltage mismatches between LED strings. The RT8577A automatically detects and disconnects any unconnected and/or broken strings during operation from PWM loop to prevent VOUT from over voltage. The 1.5% matched LED currents on all channels are simply programmed with a resistor. A very high contrast ratio true digital PWM dimming can be achieved by driving the PWM pin with a PWM signal. When an abnormal situation (OVP/short/OTP) occurs, a status signal will be sent to the system to shut down the IC. Ordering Information Package Type QW : WQFN-20L 5x5 (W-Type) Lead Plating System G : Green (Halogen Free and Pb Free) Note : Richtek products are :  Ro HS pliant and patible with the current requirements of IPC/JEDEC J-STD-020.  Suitable for use in Sn Pb or Pb-free soldering processes. Marking Information RT8577AGQW : Product Number RT8577A GQW YMDNN YMDNN : Date Code Features - Wide Input Supply Voltage Range : 5.5V to 40V - Adjustable Boost Controller Switching Frequency from 200k Hz to 2.1MHz - Programmable Channel Current - Channel Current Matching : ±1.5% - External Dimming Control - Boost MOSFET Over Current Protection - Automatic LED Open/Short Protection to Avoid Output Over Voltage - VCC Under Voltage Lockout - Adjustable Over Voltage Protection - Thermal Shutdown Protection - Abnormal Status Indicator for OVP/Short/OTP Condition - AEC-Q100 Grade 3 Certification - Ro HS pliant and Halogen Free Applications - Automotive Infotainment - LCD TV, Monitor Display Backlight - LEDDriver Application - General Purpose Constant Current Source Pin Configuration (TOP VIEW) LED2 LED1 NC PWM...