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RT8458

Richtek
Part Number RT8458
Manufacturer Richtek
Description High Efficiency PWM Buck LED Driver Controller
Published Sep 24, 2014
Detailed Description Preliminary RT8458 High Efficiency PWM Buck LED Driver Controller General Description The RT8458 is a PWM controller w...
Datasheet PDF File RT8458 PDF File

RT8458
RT8458

Overview
Preliminary RT8458 High Efficiency PWM Buck LED Driver Controller General Description The RT8458 is a PWM controller with an integrated high side floating gate driver.
It is used for step down converters by well controlling the external MOSFET and regulating a constant output current.
The output duty cycle of the RT8458 can be up to 100% for wider input voltage application, such as E27 and PAR30 off-line LED lighting products.
The RT8458 also features a 48kHz fixed frequency oscillator, an internal 178mV precision reference, and a PWM comparator with latching logic.
The accurate output LED current is achieved by an averaging current feedback loop and the LED current dimming can be easily controlled via the ACTL pin.
The RT8458 also has multiple features to protect the controller from fault conditions, including Under Voltage Lockout (UVLO), Over Current Protection circuit (OCP) and Over Voltage Protection (OVP).
Additionally, to ensure the system reliability, the RT8458 is built with the thermal protection function.
The RT8458 is housed in a TSOT-23-6 package.
Thus, the components in the whole LED driver system can be made very compact.
Features z z Low Cost and Efficient Buck Converter Solution Universal Input Voltage Range with Off-Line Topology Programmable Constant LED Current Dimmable LED Current by ACTL Output LED String Open Protection Output LED String Short Protection Output LED String Over Current Protection Built-in Thermal Protection Tiny TSOT-23-6 Package RoHS Compliant and Halogen Free z z z z z z z z Applications z E27, PAR30, Offline LED Lights Pin Configurations (TOP VIEW) SENSE VC ACTL 6 5 2 4 3 VCC GND GATE Ordering Information RT8458 Package Type J6 : TSOT-23-6 Operating Temperature Range G : Green (Halogen Free with Commercial Standard) Note : Richtek Green products are : ` TSOT-23-6 Marking Information 01=DNN 01= : Product Code DNN : Date Code RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020.
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