AAT3128 AnalogicTech, AAT3128 Datasheet

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AAT3128

Manufacturer Part Number
AAT3128
Description
RGB LED Fashion Lighting Controller
Manufacturer
AnalogicTech
Datasheet
General Description
The AAT3128 is a total solution controller for RGB
LED fashion lighting. A simplified control scheme
greatly reduces design complexity and accelerates
time to market.
The AAT3128 contains a high efficiency tri-mode
charge pump DC/DC converter with 1X, 1.5X and
2X modes for color LED applications. Current
source outputs drive two individual RGB LEDs for
color displays, fashion and mood lighting. With a
single-wire S
is easily controlled to display four distinct lighting
mood effects.
Low external parts count (two 1µF flying capacitors
and two small bypass capacitors) and high conver-
sion efficiency make the AAT3128 ideally suited for
small battery-powered portable applications.
The AAT3128 has a thermal management system
to protect the device in the event of an output short
circuit condition. Built-in soft-start circuitry prevents
excessive inrush current during start-up. A low cur-
rent shutdown feature disconnects the load from
the input source and reduces quiescent current to
less than 1µA.
The AAT3128 is available in a 14-pin TSOPJW
package.
Typical Application
3128.2007.09.1.0
V
BATTERY
2
Cwire interface, an RGB LED module
C
1μF
EN/SET
IN
38.3kΩ
R
SET
C
1μF
OUT
IN
CP
EN/SET
RSET
AAT3128
GND
ISRC2
ISRC1
C1+
C2+
C1-
C2-
DR
DG
DB
RGB LED Fashion Lighting Controller
Features
Applications
2.7V to 5.5V Input Voltage Range
Compatible with Common Anode RGB LEDs
Four S
0~60mA Programmable Current Source
Low Noise Constant Frequency Operation
No Inductors
Small Application Circuit
Regulated Output Current
Integrated LED Control Switches
Automatic Soft-Start
Less than 1µA Shutdown Current
Color Backlighting for Monochrome
LCD Displays
Color Display Lighting
Fashion Lighting RGB LEDs
Mobile Handsets
MP3 Players
PDAs
Smart Phones
C1
1μF
C1
1μF
2
Cwire Controlled Lighting Moods
R
G
LED 1
B
RGB
ChargePump
R
AAT3128
G
B
LED 2
RGB
1

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AAT3128 Summary of contents

Page 1

... General Description The AAT3128 is a total solution controller for RGB LED fashion lighting. A simplified control scheme greatly reduces design complexity and accelerates time to market. The AAT3128 contains a high efficiency tri-mode charge pump DC/DC converter with 1X, 1.5X and 2X modes for color LED applications. Current source outputs drive two individual RGB LEDs for color displays, fashion and mood lighting ...

Page 2

... LED Current Source 2. ISRC2 controls the current through the LEDs connected to it. Connect the RGB LED anode or LED array anodes to ISRC2. 14 EN/SET Enable/Set Input. ENSET turns on/off the AAT3128 and is the S control the LED color and brightness mood function. This node uses active high logic. Pin Configuration 2 ...

Page 3

... Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at condi- tions other than the operating conditions specified is not implied. Only one Absolute Maximum Rating should be applied at any one time. 2. Mounted on a FR4 board. 3128.2007.09.1.0 RGB LED Fashion Lighting Controller AAT3128 Value Units - ...

Page 4

... LAT I EN/SET Input Leakage EN/SET 1. The AAT3128 is guaranteed to meet performance specification over the –40 to +85 °C operating temperature range, and are assured by design, characterization and correlation with statistical process controls. 4 RGB LED Fashion Lighting Controller = -40 to +85˚C. Unless otherwise noted, typical values are T ...

Page 5

... Shutdown Current vs. Input Voltage 6.0 5.0 4.0 3.0 2.0 1.0 0.0 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5 4.6 4.9 5.2 5.5 1.2 1.1 1.0 0.9 0.8 0.7 85°C 0.6 0.5 0.4 4.5 4.8 5.1 5.4 2 Cwire Latch Enable Time vs. Input Voltage 400 350 300 250 200 150 100 50 0 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5 AAT3128 85°C -40°C 25°C Input Voltage (V) Enable Input Low Threshold vs. Input Voltage -40°C 85°C 25°C 3.0 3.3 3.6 3.9 4.2 4.5 4.8 5.1 Input Voltage (V) -40°C 85°C 25°C Input Voltage (V) 5.4 5 ...

Page 6

... V IN (200mV/div (200mA/div) Time (500µs/div) Input vs. Output Transient (V = 3.6V; Data ISRC1 (2V/div (200mV/div (200mA/div) Time (500µs/div) Input vs. Output Transient (V = 4.2V; Data ISRC1 (2V/div (200mV/div (200mA/div) Time (500µs/div) AAT3128 3128.2007.09.1.0 ...

Page 7

... The AAT3128 utilizes a tri mode load switch (1X) and high efficiency (1.5X or 2X) charge pump boost converter intended for RGB color LED lighting appli- cations ...

Page 8

... It is advisable to issue a 500µs low pulse to reset the data registers before send new sets of data to change lighting modes. This will avoid any possi- bility of losing synchronization between the AAT3128 and the system MCU. Data Bright/Dim 1 B ...

Page 9

... LED for a given forward current operating condition. Refer to Figure 2 or the datasheet for a given RGB LED to be used with the AAT3128. Since the ISRC1 Value (kΩ) and ISRC2 output current sources are matched with 38 ...

Page 10

... To ensure optimal device performance and accommo- date the fast switched capacitor transients generat the AAT3128, special attention should be given to the printed circuit board (PCB) layout. The PCB traces connecting C1 and C2 experience fast current transients result, the trace lengths for C1 and C2 should be minimized by placing the components as closely as possible to the IC ...

Page 11

... AAT3128 Evaluation Board Layout Figure 3: AAT3128 Evaluation Board Component Side PCB Layout. 3128.2007.09.1.0 RGB LED Fashion Lighting Controller Figure 4: AAT3128 Evaluation Board Solder Side PCB Layout. AAT3128 11 ...

Page 12

... All dimensions in millimeters. 1. XYY = assembly and date code. 2. Sample stock is generally held on part numbers listed in BOLD. 12 RGB LED Fashion Lighting Controller Marking 1 Part Number (Tape and Reel) VMXYY TSOPJW-14 7° NOM 4° ± 4° 2.75 ± 0.25 End View AAT3128 2 AAT3128ITO-T1 0.04 REF 0.45 ± 0.15 3128.2007.09.1.0 ...

Page 13

... Specific testing of all parameters of each device is not necessarily performed. AnalogicTech and the AnalogicTech logo are trademarks of Advanced Analogic Technologies Incorporated. All other brand and product names appearing in this document are registered trademarks or trademarks of their respective holders. Advanced Analogic Technologies, Inc. 3230 Scott Boulevard, Santa Clara, CA 95054 Phone (408) 737-4600 Fax (408) 737-4611 3128.2007.09.1.0 RGB LED Fashion Lighting Controller AAT3128 13 ...

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