RT8471

®

DS8471-02 December 2013

www.richtek.com

1

©

Copyright 2013 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

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

Internal Switch

General Description

The RT8471 is a high efficiency, continuous mode inductive

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.

Features

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7V to 36V Input Voltage Range

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Hysteretic Control with High Side Current Sensing

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Internal N-MOSFET with 350m

Ω

Ω

Ω

Ω

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1.2A Output Current (For SOP-8 (Exposed Pad) and

MSOP-8 (Exposed Pad) Only)

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Up to 97% Efficiency

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Typical

±±±±±5% LED Current Accuracy

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300Hz On-Board Ramp Generator

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Input Under Voltage Lockout

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Thermal Shutdown Protection

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RoHS Compliant and Halogen Free

Applications

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Automotive LED Lighting

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High Power LED Lighting

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Indicator and Emergency Lighting

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Architectural Lighting

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Low Voltage Industrial Lighting

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Signage and Decorative LED Lighting

Ordering Information

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.

Marking Information

01=DNN

01= : Product Code

DNN : Date Code

RT8471GJ5

RT8471ZSP : Product Number

YMDNN : Date Code

RT8471ZSP

RT8471

ZSPYMDNN

0D=YM

DNN

RT8471GFP

0D= : Product Code

YMDNN : Date Code

Package Type

J5 : TSOT-23-5

SP : SOP-8 (Exposed Pad-Option 1)

FP : MSOP-8 (Exposed Pad)

RT8471

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)