RT8471 Datasheet, PDF (1/15 Pages) Richtek Technology Corporation – Hysteretic, High Brightness LED Driver

®
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 MSOP-
8 (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 R_DS(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