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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.
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
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