AAT3128_08 datasheet(7/12 Pages) ANALOGICTECH

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AAT3128

RGB LED Fashion Lighting Controller

ChargePumpTM

PRODUCT DATASHEET

3128.2008.02.1.1

www .analogictech.com

AAT3128

RGB LED Fashion Lighting Controller

ChargePumpTM

PRODUCT DATASHEET

3128.2008.02.1.1

www .analogictech.com

Functional Description

The AAT3128 is specifically designed to drive RGB color

LEDs. This device is externally programmed via the sim-

ple single wire serial S2Cwire interface to set one of 16

color lighting modes based on four distinct preset color

light mood schemes. In addition to the four color lighting

moods, there are two brightness levels and two lightning

sequence change speeds that may be selected.

The AAT3128 utilizes a tri mode load switch (1X) and

high efficiency (1.5X or 2X) charge pump boost con-

verter intended for RGB color LED lighting applications.

To maximize power conversion efficiency, an internal

sensing circuit monitors the voltage required for the con-

stant current source outputs and sets the load switch or

charge pump modes based on the input battery voltage.

As the battery discharges over time, the AAT3128 charge

pump is enabled when the current source outputs near

dropout. The charge pump initially starts in 1.5X mode.

If the charge pump output droops enough for the current

source output to become close to dropout, the charge

pump will automatically transition to 2X mode. This load

switch to charge pump control system provides the

maximum power conversion efficiency for any given

operating condition.

The AAT3128 requires only four external components:

two 1μF ceramic capacitors for the charge pump flying

capacitors (C1 and C2), one 1μF ceramic input capacitor

(CIN) and one 1μF ceramic output capacitor (CP).

RGB LED Lighting Set-Up and Control

The AAT3128 has four preset RGB LED color lighting

moods which may be selected via the EN/SET function.

These four lighting color moods are outlined in Table 1.

Each lighting color mood mode selects a preset group of

64 unique colors that the system controller repeatedly

sequences through at a selected fast or slow rate.

RGB LED brightness and color change timing may be

varied by a choice of two levels for both. The Brightness

control permits the full current to power the RGB LED

Functional Block Diagram

Voltage

Reference

Soft Start

1MHz

Oscillator

1.5X

Charge

Pump

S2Cwire

Interface

Control

Current Level

Program

and LED

Switch / Mood

EN/SET

RSET

C1+

C1-

C2+

C2-

ISRC2

ISRC1

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