LP3942 Datasheet, PDF (1/20 Pages) National Semiconductor (TI) – The Dual RGB LED Controller with 1.5x/2x Charge Pump and SPI Interface

PRELIMINARY
November 2004
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
Features
n Pre-regulated 1.5x and 2x charge pump with regulated
output (4.5V and 5.0V)
n 2 separately controlled PWM RGB LED drivers with
programmable color and brightness
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
Typical Application
© 2004 National Semiconductor Corporation DS201292
20129201
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