RT8494

®

DS8494-01 November 2015

www.richtek.com

1

©

Copyright 2015 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

Ordering Information

High Voltage High Current LED Driver Controller for

Buck, Boost or Buck-Boost Topology

Features

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Threshold Common Mode Voltage up to 90V

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Buck, Boost or Buck-Boost Operation

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Programmable Switching Frequency

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Easy Dimming Control : Analog or Digital

Converting to Analog with One External Capacitor

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Programmable Soft-Start to Avoid Inrush Current

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Programmable Over-Voltage Protection

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AEC-Q100 Compliance

Pin Configurations

(TOP VIEW)

General Description

The RT8494 is a current mode PWM controller designed

to drive an external MOSFET for high current LED

applications. With a current sense amplifier threshold of

190mV, the LED current is programmable with one

external current sense resistor. With the maximum

operating input voltage of 36V and output voltage up to

90V, the RT8494 is ideal for Buck, Boost or Buck-Boost

operation.

With the switching frequency programmable over 100kHz

to 1MHz, the external inductor and capacitors can be small

while maintaining high efficiency.

Dimming can be done by either analog or digital. The built-

in clamping comparator and filter allow easy low noise

analog dimming conversion from digital signal with only

one external capacitor.

The RT8494 is available in SOP-14 package.

Applications

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General Industrial High Power LED Lighting

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Desk Lights and Room Lighting

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Building and Street Lighting

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Industrial Display Backlight

SOP-14

GATE

GBIAS

VCC

GND

OVP

EN

SS

RSET

ISW

ISP

ISN

VC

ACTL

DCTL

2

3

4

5

8

7

6

14

13

12

11

10

9

Note :

Richtek products are :



RoHS compliant and compatible with the current require-

ments of IPC/JEDEC J-STD-020.

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Suitable for use in SnPb or Pb-free soldering processes.

RT8494

Package Type

S : SOP-14

Lead Plating System

G : Green (Halogen Free and Pb Free)

Marking Information

RT8494GS : Product Number

YMDNN : Date Code

RT8494

GSYMDNN