RT8494 Datasheet, PDF (1/17 Pages) Richtek Technology Corporation – High Voltage High Current LED Driver Controller

®
RT8494
High Voltage High Current LED Driver Controller for
Buck, Boost or Buck-Boost Topology
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.
Features
 High Voltage Capability : V_IN up to 36V, LED Sensing
Threshold Common Mode Voltage up to 90V
 Buck, Boost or Buck-Boost Operation
 Programmable Switching Frequency
 Easy Dimming Control : Analog or Digital
Converting to Analog with One External Capacitor
 Programmable Soft-Start to Avoid Inrush Current
 Programmable Over-Voltage Protection
 V_IN Under-Voltage Lockout and Thermal Shutdown
 AEC-Q100 Compliance
Applications
 General Industrial High Power LED Lighting
 Desk Lights and Room Lighting
 Building and Street Lighting
 Industrial Display Backlight
Ordering Information
RT8494
Package Type
S : SOP-14
Lead Plating System
G : Green (Halogen Free and Pb Free)
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.
Pin Configurations
(TOP VIEW)
RSET
14
ISW
2
13
ISP
3
12
ISN
4
11
VC
5
10
ACTL
6
9
DCTL
7
8
SOP-14
GATE
GBIAS
GND
VCC
OVP
EN
SS
Marking Information
RT8494
GSYMDNN
RT8494GS : Product Number
YMDNN : Date Code
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS8494-01 November 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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