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RT8471 Dataheets PDF



Part Number RT8471
Manufacturers Richtek
Logo Richtek
Description High Brightness LED Driver
Datasheet RT8471 DatasheetRT8471 Datasheet (PDF)

® 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 .

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® 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 Marking Information RT8471GJ5 01=DNN 01= : Product Code DNN : Date Code RT8471ZSP RT8471 ZSPYMDNN RT8471ZSP : Product Number YMDNN : Date Code RT8471GFP 0D=YM DNN 0D= : Product Code YMDNN : Date Code Copyright ©2013 Richtek Technology Corporation. All rights reserved. DS8471-02 December 2013 is a registered trademark of Richtek Technology Corporation. www.richtek.com 1 RT8471 Pin Configurations VIN SENSE 54 23 LX GND ADJ TSOT-23-5 (TOP VIEW) VIN SENSE GND ADJ 8 27 GND 36 9 45 GND LX NC NC SOP-8 (Exposed Pad) SENSE GND GND ADJ 8 2 GND 7 3 96 45 VIN NC LX LX MSOP-8 (Exposed Pad) Typical Application Circuit VIN 7V to 36V CIN RT8471 VIN SENSE RS optional ADJ GND LX L D Functional Pin Description TSO T-23-5 1 2 3 4 5 Pin No. SOP-8 (Exposed Pad) 7 MSOP-8 (Exposed Pad) 5, 6 Pin Name LX 3, 8, 9 (Exposed Pad) 2, 3, 9 (Exposed Pad) GND 4 4 ADJ 2 1 SENSE 1 8 VIN Pin Function Switch O utput Terminal. Dr ai n of inter nal N-MOSFET. Ground. The exposed pad must be.


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