High Voltage High Current LED Driver Controller for Buck
Boost or Buck-Boost Topology
The RT8452 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
48V, the RT8452 is ideal for Buck, Boost or Buck-Boost
With 350kHz operating frequency, the external inductor
and capacitors can be small while maintaining high
Dimming can be done by either analog or digital. A built-in
clamping comparator and filter allow easy low noise analog
dimming conversion from digital signal with only one
external capacitor. An unique True PWM dimming control
is made easy with MOSFET under LED string. A very high
dimming ratio can be achieved by adopting both analog/
digital dimming and True PWM dimming together.
The RT8452 is available in WQFN-16L 3x3 and SOP-16
S : SOP-16
QW : WQFN-16L 3x3 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
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.
z High Voltage Capability : VIN Up to 36V, VOUT Up to
z Buck, Boost or Buck-Boost Operation
z Current Mode PWM with 350kHz Switching
z Easy Dimming Control : Analog or Digital
Converting to Analog with One External Capacitor
z True PWM Dimming : External FET Driver is Build-
z Programmable Soft Start to Avoid Inrush Current
z Programmable Over Voltage Protection
z VIN Undervoltage Lockout and Thermal Shutdown
z 16-Lead WQFN and SOP Packages.
z RoHS Compliant and Halogen Free
z General Industrial High Power LED Lighting
z Desk Lights and Room Lighting
z Building and Street Lighting
z Industrial Display Backlight
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Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS8452-03 May 2012
is a registered trademark of Richtek Technology Corporation.