GENERAL DESCRIPTION
The NJU6051 is a white LED driver with an automatic dimming control. It contains an output driver, a PWM controller, a luminance sensor control (power supply for sensor & A/D converter), a step-up DC/DC converter, a serial interface, etc.
The output driver ensures a 30mA maximum capability which allows the connection of 8 white LEDs (4 series x 2 parallels). Depending on the ambient light sensed with an external luminance sensor, the PWM controller controls PWM duty in 8 steps preselected out of 64 steps. In addition, the frequency of the DC/DC converter is high so that it permits the use of small, low-profile inductors and capacitors to minimize the footprint in space-conscious applications.
All of these benefits make the NJU6051 suitable for the battery-powered portable applications such as a cellular phone, a camcorder, PDA, etc.

FEATURES
● Drives up to 8 white LEDs (4 series x 2 parallels)
   VSW = 18.0V(Max.), IOUT = 30mA
● Built-in PWM Dimming Control
   (Selectable 8 out of 64 steps)
● Built-in Luminance Sensor Control (Power Supply for Sensor & A/D converter)
   (No MPU-access required after initial setting)
● Built-in Temperature Compensation Circuit to Suppress the Characteristic Degradation of LEDs
● Uses Small Inductor and Capacitors
● 1.8V to 3.6V Operating Voltage for Logic Circuits (VDDL)
● 3.0V to 5.5V Operating Voltage for Step-up Circuits (VDD)
● CMOS Technology
● Package                        : QFN20 / SSOP20