LP3942YQ NSC [National Semiconductor], LP3942YQ Datasheet

Manufacturer Part Number

LP3942YQ

Description

The Dual RGB LED Controller with 1.5x/2x Charge Pump and SPI Interface

Manufacturer

NSC [National Semiconductor]

Datasheet

1.LP3942YQ.pdf (20 pages)

LP3942

The Dual RGB LED Controller with 1.5x/2x Charge Pump

and SPI Interface

General Description

The LP3942 is an integrated stand-alone RGB LED control-

ler with a high efficiency and low noise programmable 1.5x

and 2x charge pump. The RGB LEDs are controlled through

the low voltage SPI interface. RGB programmability allows

unique color and brightness control with both RGB outputs.

The color control has preselected color settings for color

blending. The LED current control is done using constant

current sinks that can be also used as switches. The non-

overlapping RGB output PWM control minimizes the input

noise.

See also: LP3931, LP3933 and LP3936 Lighting Manage-

ment Units

Typical Application

DS201292

Features

n Pre-regulated 1.5x and 2x charge pump with regulated

n 2 separately controlled PWM RGB LED drivers with

n Overlapping and non-overlapping RGB mode

n Wide input voltage range 3V–5.0V

n Output current up to 120 mA

n Low voltage SPI interface

n Programmable low current Standby mode

n Tiny LLP24 package (5mm*4mm*0.8mm)

Applications

n Cellular Phones, PDAs

output (4.5V and 5.0V)

programmable color and brightness

PRELIMINARY

November 2004

www.national.com

20129201