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RT8471

Richtek
Part Number RT8471
Manufacturer Richtek
Description High Brightness LED Driver
Published Mar 1, 2015
Detailed Description ® RT8471 1.2A/1A, Hysteretic, High Brightness LED Driver with Internal Switch General Description The RT8471 is a high...
Datasheet PDF File RT8471 PDF File

RT8471
RT8471

Overview
® RT8471 1.
2A/1A, Hysteretic, High Brightness LED Driver with Internal Switch General Description The RT8471 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 36V and employs hysteretic control with a high side current sense resistor to set the constant output current.
The RT8471 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 RT8471 is available in a small TSOT-23-5 package or a more thermal efficient SOP-8 (Exposed Pad) and MSOP8 (Exposed Pad) packages.
Ordering Information RT8471 Package Type J5 : TSOT-23-5 SP : SOP-8 (Exposed Pad-Option 1) FP : MSOP-8 (Exposed Pad) Lead Plating System G : Green (Halogen Free and Pb Free) (for MSOP-8 (Exposed Pad) and TSOT-23-5 ) Z : ECO (Ecological Element with Halogen Free and Pb free) (for SOP-8 (Exposed Pad) Only) Note : Richtek products are :  RoHS compliant and compatible with the current require- ments of IPC/JEDEC J-STD-020.
 Suitable for use in SnPb or Pb-free soldering processes.
Features  7V to 36V Input Voltage Range  Hysteretic Control with High Side Current Sensing  Internal N-MOSFET with 350mΩ Low RDS(ON)  1A Output Current (For TSOT-23-5 Only)  1.
2A Output Current (For SOP-8 (Exposed Pad) and MSOP-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 Applications  Automotive LED Lighting  High Power LED Lighting  Indicator and Emergency Lighting  Architectural Lighting  Low Voltage Industrial Lighting  Signage and Decorative LED Lighting Mar...


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