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NJU6052

REMOTE CONTROL COMMANDER IC

Japan Radio Corporation  

NJU6052

PRELIMINARY

White LED Driver with Automatic Dimming Control

! GENERAL DESCRIPTION

The NJU6052 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 60mA maximum capability

which allows the connection of 12 white LEDs (4 series x 3

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 NJU6052 suitable for the

battery-powered portable applications such as a cellular

phone, a camcorder, PDA, etc.

! PACKAGE OUTLINE

NJU6052KN1

NJU6052V

! FEATURES

# Drives up to 12 white LEDs (4 series x 3 parallels)

VSW = 18.0V(Max.), IOUT = 60mA

# 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

: QFN28 / SSOP20

Ver.2004-02-26

-1-

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