High Voltage 4-CH LED Driver


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The RT8577A is an 4-CH LED driver capable of delivering 120mA for each channel. The RT8577A is a current mode boost converter with an adjustable switching frequency via the RT pin from 200kHz 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.


  • Automotive Infotainment
  • LCD TV, Monitor Display Backlight
  • LED Driver Application
  • General Purpose Constant Current Source
Key Spec.
Status Active
Vin (min) (V) 5.5
Vin (max) (V) 40
Vout (max) (V) 45
LED Channels 4
Topology Boost
Vcs (typ) (mV) 500
Dimming Control PWM
Features AEC-100 Qualified;Adjustable Frequency;Backlight;Cycle-by-Cycle Current Limit;Enable Input;OCP;OVP;SCP
Package Type WQFN5x5-20
  • Wide Input Supply Voltage Range : 5.5V to 40V
  • Adjustable Boost Controller Switching Frequency from 200kHz 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
  • RoHS Compliant and Halogen Free
TitleLast UpdateShareDownload
High Voltage 4-CH LED Driver2016/06/24
Technical Documents
TitleLast UpdateShareDownload
Automotive Product Selection Guide2020/12/30
Richtek Selection Guide [Oct., 2020]2020/12/30
Minimizing Light Flicker in LED Lighting Applications2018/08/15
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT8577AGQWWQFN5x5-201500 Request Buy from Distributor