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High Voltage High Current LED Driver Controller for Buck, Boost or Buck-Boost Topology

RT8494

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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

  • General Industrial High Power LED Lighting
  • Desk Lights and Room Lighting
  • Building and Street Lighting
  • Industrial Display Backlight
  • DC-DC LED Drivers
Key Spec.
RT8494
Status Active
Vin (min) (V) 6
Vin (max) (V) 36
Vout (max) (V) 90
LED Channels 1
Topology Boost;Buck
SW Freq (typ) (kHz) 370
Vcs (typ) (mV) 190
Dimming Control Analog;PWM;PWM-to-Analog
Features Adjustable Frequency;Adjustable Soft-Start;Enable Input;OCP;OVP
Package Type SOP-14
Features
  • High Voltage Capability : VIN 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
  • VIN Under-Voltage Lockout and Thermal Shutdown
  • AEC-Q100 Compliance
Datasheet
TitleLast UpdateShareDownload
High Voltage High Current LED Driver Controller for Buck, Boost or Buck-Boost Topology2011/09/19
Technical Documents
TitleLast UpdateShareDownload
Power Solutions for LED Lighting Applications2018/11/22
Automotive Product Selection Guide2018/11/15
Richtek Wide Input Voltage Range DC/DC Power Solutions for Industrial, Automotive and LED lighting applications2018/11/01
Minimizing Light Flicker in LED Lighting Applications2018/08/15
Evaluation Boards
TitleLast UpdateShareDownload
High Voltage High Current LED Driver Controller for Buck, Boost or Buck-Boost Topology2018/11/08
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT8494GSSOP-142500 Not available Buy from Distributor
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