1.2A/1A, Hysteretic, High Brightness LED Driver with Internal Switch


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The RT8470 is a high efficiency, continuous mode inductive step-down converter, designed for driving single or multiple series connected LEDs from a voltage source higher than the LED voltage. It operates from an input voltage of 7V to 30V and employs hysteretic control with a high side current sense resistor to set the constant output current.

The RT8470 includes an output switch and a high side output current sensing circuit, which uses an external resistor to set the nominal average output current. LED brightness control is achieved with PWM dimming from an analog or PWM input signal.

The RT8470 is available in a small TSOT-23-5 package or a more thermal efficient SOP-8 (Exposed Pad) package.


  • Automotive LED Lighting
  • High Power LED Lighting
  • Indicator and Emergency Lighting
  • Architectural Lighting
  • Low Voltage Industrial Lighting
  • Signage and Decorative LED Lighting
Key Spec.
Status NRND
Recommended Alternative  RT8471
Vin (min) (V) 7
Vin (max) (V) 30
Vout (max) (V) 26
LED Channels 1
Topology Buck
SW Freq (typ) (kHz) 500
Vcs (typ) (mV) 100
Dimming Control Analog;PWM
Features OCP
Package Type TSOT-25;PSOP-8
  • 7V to 30V Input Voltage Range
  • Hysteretic Control with High Side Current Sensing
  • Internal N-MOSFETs with 350mΩ Low RDS(ON)
  • 1A Output Current (For TSOT-23-5 Only)
  • 1.2A Output Current (For SOP-8 (Exposed Pad) Only)
  • Up to 97% Efficiency
  • Typical ±5% LED Current Accuracy
  • Analog or PWM Control Signal for LED Dimming
  • 300Hz On-Board Ramp Generator
  • Input Under Voltage Lockout
  • Thermal Shutdown Protection
  • RoHS Compliant and Halogen Free
Title Last Update ShareDownload
1.2A/1A, Hysteretic, High Brightness LED Driver with Internal Switch 2015/05/19
Technical Documents
TitleLast UpdateShareDownload
Minimizing Light Flicker in LED Lighting Applications2018/08/15