RT8474
RT8474 is High Voltage Multiple-Topology LED Driver manufactured by Richtek.
Description
The RT8474 is a current-mode LED driver supporting wide input voltage range from 4.5V to 50V and output voltage up to 50V. With internal 500k Hz operating frequency, the size of the external PWM inductor and input/output capacitors can be minimized. High efficiency is achieved by a 100m V current sensing control. LED dimming control can be done from either analog or PWM signal. The RT8474 provides an internal soft-start function to avoid inrush current and thermal shutdown to prevent the device from overheat.
The RT8474 is available in the SOP-8 (Exposed pad) package.
Ordering Information
Package Type SP : SOP-8 (Exposed-Option 2)
Lead Plating System G : Green (Halogen Free and Pb Free)
Note :
Richtek products are :
Ro HS pliant and patible with the current require- ments of IPC/JEDEC J-STD-020.
Suitable for use in Sn Pb or Pb-free soldering processes.
Features
- High Voltage : VIN Up to 50V, VOUT Up to 50V
- Support Multiple-Topologies (Buck / Boost / Buck-
Boost)
- Built-In 2A Power Switch
- Current-Mode PWM Control
- 500k Hz Fixed Switching Frequency
- Analog or PWM Control Signal for LED Dimming
- Internal Soft-Start to Avoid Inrush Current
- Under-Voltage Lockout
- Thermal Shutdown
- Ro HS pliant and Halogen Free
Applications
- Desk Lights and Room Lighting
- Industrial Display Backlight
Marking Information
RT8474 GSPYMDNN
RT8474GSP : Product Number YMDNN : Date Code
Pin Configurations
(TOP VIEW)
VCC ISP ISN NC
36 9
CREG SW CTL VC
SOP-8 (Exposed Pad)
Simplified Application Circuit
VIN R3 C1
Analog Dimming or PWM...
