PWM Step-Up DC/DC Controller for White-LED Driver
The RT9288A is a wide input operating voltage range step-
up controller. High voltage output and large output current
are feasible by using an external N-MOSFET. The RT9288A
input operating range is from 3V to 13.5V. Besides, it
could support up to 60V output at 12V input.
The RT9288A is an optimized design for WLED driver
applications. Adjusting the output current of the RT9288A
changes the brightness of the WLEDs. Chip Enable pin
can be used as a digital input allowing WLED brightness
control with a logic-level PWM signal.
E : SOT-23-6
Lead Plating System
P : Pb Free
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 VIN Operating Range : 3V to 13.5V
z Fixed PWM Frequency : 1MHz
z 200Hz to 200kHz PWM Dimming Frequency
z Flexible PWM/Analog Dimming Control
z Voltage Mode with External Compensation
z Soft Start Function
z RoHS Compliant and 100% Lead (Pb)-Free
z TFT LCD Panels
z LED Backlighting
EXT GND COMP
VDD EN FB
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
Functional Pin Description
Pin No. Pin Name
Supply Input Voltage Pin. Bypass an 1uF capacitor to GND to reduce the input noise.
Chip Enable (Active High).
Feedback to Error Amplifier Input.
Output of Error Amplifier. Connect a capacitor between the COMP pin and GND for
compensation. While shutdown, this pin is pulled down by an internal resistor.
Output for External Transistor.
DS9288A-02 April 2011