RT8509A

® RT8509A 4.5A Step-Up DC/DC Converter General Description The RT8509A is a high performance switching Boost converter that provides a regulated supply voltage for active matrix thin film transistor (TFT) liquid crystal displays (LCDs). The RT8509A incorporates current mode, fixed-frequency, pulse width modulation (PWM) circuitry with a built in N-MOSFET to achieve high efficiency and fast transient response. The RT8509A has a wide input voltage range from 2.8V to 14V. In addition, the output voltage can be adjusted up to 24V via an external resistive voltage divider. The maximum peak current is limited to 4.5A (min.). Other features include adjustable soft-start, over-voltage protection, and over-temperature protection. The RT8509A is available in the WDFN-12L 5x5 package. Marking Information RT8509A GQW YMDNN RT8509AGQW : Product Number YMDNN : Date Code Features  90% Efficiency  Adjustable Output Up to 24V  2.8V to 14V Input Supply Voltage  Input Supply Under-Voltage Lockout  Fixed 1.2MHz Switching Frequency  Adjustable Soft-Start  VOUT Over-Voltage Protection  Over-Temperature Protection  Thin 12-Lead WDFN Package  RoHS Compliant and Halogen Free Applications  GIP TFT-LCD Panels Ordering Information RT8509A Package Type QW : WDFN-12L 5x5 (W-Type) Note : 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...