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AAT3128 AAT3128
RGB LED Fashion Lighting Controller
ChargePump
TM
PRODUCT DATASHEET
3128.2008.02.1.1
1
w w w . a n a l o g i c t e c h . c o m
General Description
The AAT3128 is a total solution controller for RGB LED
fashion lighting. A simplified control scheme greatly reduc-
es 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
2
Cwire interface, an RGB
LED module is easily controlled to display four distinct
lighting mood effects.
Low external parts count (two 1F flying capacitors and
two small bypass capacitors) and high conversion effi-
ciency make the AAT3128 ideally suited for small bat-
tery-powered portable applications.
The AAT3128 has a thermal management system to pro-
tect 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 current shutdown
feature disconnects the load from the input source and
reduces quiescent current to less than 1A.
The AAT3128 is available in a 14-pin TSOPJW package.
Features
2.7V to 5.5V Input Voltage Range
Compatible with Common Anode RGB LEDs
Four S
2
Cwire Controlled Lighting Moods
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 1A Shutdown Current
Applications
Color Backlighting for Monochrome LCD Displays
Color Display Lighting
Fashion Lighting RGB LEDs
Mobile Handsets
MP3 Players
PDAs
Smart Phones
Typical Application
G
R
B
C
IN
1F
R
SET
38.3k C
OUT
1F
C1
1F
C1
1F
V
BATTERY
EN/SET
IN
CP
C1+
C1-
C2+
C2-
DR
DG
DB
EN/SET
GND
AAT3128
RGB
LED 1
ISRC2
ISRC1
G
R
B
RGB
LED 2
RSET AAT3128
RGB LED Fashion Lighting Controller
ChargePump
TM
PRODUCT DATASHEET
2
3128.2008.02.1.1
w w w . a n a l o g i c t e c h . c o m
AAT3128
RGB LED Fashion Lighting Controller
ChargePump
TM
PRODUCT DATASHEET
2
3128.2008.02.1.1
w w w . a n a l o g i c t e c h . c o m
Pin Descriptions
Pin #
Symbol Function
1
RSET
Current Setting Resistor. Connect a resistor from RSET to GND to program the maximum LED current
2
DG
Green LED On/Off Switch. DG turns on/off the green LED. Connect the green LED cathode to DG.
3
DR
Red LED On/Off Switch. DR turns on/off the red LED. Connect the red LED cathode to DR.
4
DB
Blue LED On/Off Switch. DB turns on/off the blue LED. Connect the blue LED cathode to DB.
5
GND
Ground.
6
IN
Power Input. Connect the input power voltage source to IN. Connect a 1F ceramic capacitor from IN to GND.
7
C2-
Flying Capacitor 2 Negative Node. Connect a 1F ceramic capacitor between C2+ and C2-.
8
C2+
Flying Capacitor 2 Positive Node. Connect a 1F ceramic capacitor between C2+ and C2-.
9
C1-
Flying Capacitor 1 Negative Node. Connect a 1F ceramic capacitor between C1+ and C1-.
10
C1+
Flying Capacitor 1 Positive Node. Connect a 1F ceramic capacitor between C1+ and C1-.
11
CP
Charge Pump Output. CP is the output voltage stage of the internal charge pump. Bypass CP to GND with a
1F ceramic capacitor.
12
ISRC1
LED Current Source 1. ISRC1 controls the current through the LEDs connected to it. Connect the RGB LED
anode or LED array anodes to ISRC1.
13
ISRC2
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
2
Cwire serial interface input to control the
LED color and brightness mood function. This node uses active high logic.
Pin Configuration
TSOPJW-14
(Top View)
1
2
3
4
5
6
14
13
12
11
10
9
RSET
DG
DR
DB
GND
IN
EN/SET
ISRC2
ISRC1
CP
C1+
C1-
7
8
C2-
C2+ AAT3128
RGB LED Fashion Lighting Controller
ChargePump
TM
PRODUCT DATASHEET
3128.2008.02.1.1
3
w w w . a n a l o g i c t e c h . c o m
AAT3128
RGB LED Fashion Lighting Controller
ChargePump
TM
PRODUCT DATASHEET
3128.2008.02.1.1
3
w w w . a n a l o g i c t e c h . c o m
Absolute Maximum Ratings
1
Symbol
Description
Value
Units
V
IN
, V
CP
IN, CP to GND
-0.3 to 6
V
V
C1+
, V
C1-
, V
C2+
, V
C2-
C1+, C1-, C2+, C2- to GND
-0.3 to V
CP
+ 0.3
V
V
EN/SET
, V
RSET
, V
ISRC1
,
V
ISRC2
, V
DG
, V
DR
, V
DB
EN/SET, RSET, ISRC1, ISRC2, DG, DR, DB to GND
-0.3 to V
IN
+ 0.3
V
T
J
Operating Junction Temperature Range
-40 to 150
°C
T
LEAD
Maximum Soldering Temperature (at leads, 10 sec)
300
°C
Thermal Characteristics
2
Symbol
Description
Value
Units JA
Maximum Thermal Resistance
160
°C/W
P
D
Maximum Power Dissipation
625
mW
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions 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. AAT3128
RGB LED Fashion Lighting Controller
ChargePump
TM
PRODUCT DATASHEET
4
3128.2008.02.1.1
w w w . a n a l o g i c t e c h . c o m
AAT3128
RGB LED Fashion Lighting Controller
ChargePump
TM
PRODUCT DATASHEET
4
3128.2008.02.1.1
w w w . a n a l o g i c t e c h . c o m
Electrical Characteristics
V
IN
= 3.6V, C
IN
= C
OUT
= C1 = C2 = 1.0F; T
A
= -40 to +85C. Unless otherwise noted, typical values are T
A
= 25C.
Symbol
Description
Conditions
Min
Typ
Max
Units
Input Power Supply
V
IN
Input Operation Range
2.7
5.5
V
I
CC
Operating Current
3.0 V
IN
5.5, C
P
= 1.5x, No Load Current
3
7
mA
I
SHDN
Shutdown Current
EN = 0
10
A
I
SRC
Output Current Accuracy
3.0 V
IN
5.5
-5
5
% Ef ciency
V
IN
= 3.5
93
%
Charge Pump
T
SS
Soft-Start Time
200
s
F
CLK
Clock Frequency
1
MHz Ef ciency
V
IN
= 3.5
93
%
Switches
R
DS(ON)
Switch On Resistance
V
IN
= 3.5, T
A
= 25°C
2 EN/SET
V
EN(L)
Enable Threshold Low
0.4
V
V
EN(H)
Enable Threshold High
1.4
V
T
EN/SET LO
EN/SET Low Time
V
EN/SET
< 0.6V
0.3
75
s
T
EN/SET HI
Minimum EN/SET High Time
V
EN/SET
> 1.4V
50
ns
T
OFF
EN/SET Off Timeout
V
EN/SET
< 0.6V
500
s
T
LAT
EN/SET Latch Timeout
V
EN/SET
> 1.4V
500
s
I
EN/SET
EN/SET Input Leakage
V
EN/SET
= 5V
-1
1
A
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. AAT3128
RGB LED Fashion Lighting Controller
ChargePump
TM
PRODUCT DATASHEET
3128.2008.02.1.1
5
w w w . a n a l o g i c t e c h . c o m
AAT3128
RGB LED Fashion Lighting Controller
ChargePump
TM
PRODUCT DATASHEET
3128.2008.02.1.1
5
w w w . a n a l o g i c t e c h . c o m
Typical Characteristics
Current Source Output vs. Input Voltage
Input Voltage (V)
ISRC1 Current (mA)
20
30
40
50
60
70
80
90
2.5
2.8
3.1
3.4
3.7
4.0
4.3
4.6
4.9
5.2
5.5
-40°C
25°C
85°C

Shutdown Current vs. Input Voltage
Input Voltage (V)
Shutdown Current (µA)
0.0
1.0
2.0
3.0
4.0
5.0
6.0
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
85°C
25°C
-40°C
Enable Input High Threshold
vs. Input Voltage
Input Voltage (V)
V
IH
(V)
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
2.7
3.0
3.3
3.6
3.9
4.2
4.5
4.8
5.1
5.4
-40°C
25°C
85°C

Enable Input Low Threshold
vs. Input Voltage
Input Voltage (V)
V
IL
(V)
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
2.7
3.0
3.3
3.6
3.9
4.2
4.5
4.8
5.1
5.4
-40°C
25°C
85°C
EN/SET Turn-Off Time vs. Input Voltage
Input Voltage (V)
T
OFF
(µs)
0
50
100
150
200
250
300
350
400
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
-40°C
25°C
85°C

S
2
Cwire Latch Enable Time vs. Input Voltage
Input Voltage (V)
T
LAT
(µs)
0
50
100
150
200
250
300
350
400
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
-40°C
25°C
85°C AAT3128
RGB LED Fashion Lighting Controller
ChargePump
TM
PRODUCT DATASHEET
6
3128.2008.02.1.1
w w w . a n a l o g i c t e c h . c o m
AAT3128
RGB LED Fashion Lighting Controller
ChargePump
TM
PRODUCT DATASHEET
6
3128.2008.02.1.1
w w w . a n a l o g i c t e c h . c o m
Typical Characteristics
Input vs. Output Transient
(V
IN
= 2.7V; Data 1)
Time (500µs/div)
V
IN
(200mV/div)
V
ISRC1
(2V/div)
I
IN
(200mA/div)

Input vs. Output Transient
(V
IN
= 2.7V; Data 5)
Time (500µs/div)
V
IN
(200mV/div)
V
ISRC1
(2V/div)
I
IN
(200mA/div)
Input vs. Output Transient
(V
IN
= 3.6V; Data 1)
Time (500µs/div)
V
IN
(200mV/div)
V
ISRC1
(2V/div)
I
IN
(200mA/div)

Input vs. Output Transient
(V
IN
= 3.6V; Data 5)
Time (500µs/div)
V
IN
(200mV/div)
V
ISRC1
(2V/div)
I
IN
(200mA/div)
Input vs. Output Transient
(V
IN
= 4.2V; Data 1)
Time (500µs/div)
V
IN
(200mV/div)
V
ISRC1
(2V/div)
I
IN
(200mA/div)

Input vs. Output Transient
(V
IN
= 4.2V; Data 5)
Time (500µs/div)
V
IN
(200mV/div)
V
ISRC1
(2V/div)
I
IN
(200mA/div) AAT3128
RGB LED Fashion Lighting Controller
ChargePump
TM
PRODUCT DATASHEET
3128.2008.02.1.1
7
w w w . a n a l o g i c t e c h . c o m
AAT3128
RGB LED