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PDF AAT3103 Data sheet ( Hoja de datos )

Número de pieza AAT3103
Descripción 3-Channel Charge-Pump LED Driver
Fabricantes Advanced Analog Technology 
Logotipo Advanced Analog Technology Logotipo



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No Preview Available ! AAT3103 Hoja de datos, Descripción, Manual

ChargePumpTM
General Description
The AAT3103 is a constant frequency charge-pump based
current-source white LED driver capable of driving one to
three LEDs up to 30mA, each. The charge pumps auto-
matically switch between 1x mode and 2x mode to main-
tain the highest efficiency and optimal LED current accu-
racy and matching. A low external parts count (one 1μF
flying capacitor, two small 1μF capacitors at IN and OUT
and one current setting resistor) makes the AAT3103 ide-
www.DataaSlhlyeest4uUit.ecodmfor small battery-powered applications.
The AAT3103-1/-2 uses AnalogicTech's Simple Serial
Control™ (S2Cwire™) interface to enable, disable, and
program the LED driving current. The AAT3103-4 employs
a Pulse Width Modulation (PWM) signal with up to 50kHz
frequency, 10% to 100% duty cycle to program the LED
current. A low-current shutdown feature disconnects the
load from IN and reduces quiescent current to less than
1μA. Built-in soft-start circuitry prevents excessive inrush
current during start-up. Integrated short circuit and ther-
mal protection circuitry protects the device from damage.
The AAT3103 is available in a 2x2.1mm thermally
enhanced Pb-free 10-lead SC70JW-10 package.
PRODUCT DATASHEET
AAT3103
3-Channel Charge-Pump LED Driver
Features
Source WLED Driver, up to 3 LEDs at up to 30mA, each
Automatic Switching Between 1x and 2x Modes
900KHz Switching Frequency
Linear LED Output Current Control
Single-wire, S2Cwire Interface
AAT3103-1: 16-step
AAT3103-2: 8-step
ON/OFF or PWM Interface
AAT3103-4
±10% LED Output Current Accuracy
±3% LED Output Current Matching
Low-current Shutdown Mode
Built-in Short Circuit and Thermal Protection
Automatic Soft-start
2x2.1mm SC70JW-10 Package
Applications
Cordless Phone Handsets
Mobile Phone Handsets
MP3 and PMP Players
Digital Cameras
Typical Application
Input Voltage
2.7V to 5.5V
CIN
1μF
EN /SET
S2Cwire
Interface
CP
1μF
RSET
14.3kΩ
IN
C+ OUT
AAT3103-1
C-
EN/SET
D1
D2
RSET
D3
AGND
COUT
1μF
WLEDs
OSRAM LW M 678
or equivalent
3103.2008.03.1.0
www.analogictech.com
1

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AAT3103 pdf
ChargePumpTM
Typical Characteristics
Shutdown Current vs. Temperature
0.07
0.06
0.05
0.04
0.03
www.DataSheet4U.com
0.02
0.01
0.00
-40
-15 10
35
Temperature (°C)
VIN = 5.5V
VIN = 2.7V
60 85
Operating Current vs. Input Voltage
(No Load; D1, D2, D3 Open)
4.2
4.1
3.9
3.8
3.6
2.5
3
3.5 4
4.5
Input Voltage (V)
85°C
25°C
-40°C
5 5.5
Efficiency vs. Input Voltage
100
90
80
70
60
50
40
30
20
ILED = 30mA,VF = 3.5V
ILED = 20mA,VF = 3.2V
10 ILED = 10mA,VF = 3.0V
0
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
Input Voltage (V)
PRODUCT DATASHEET
AAT3103
3-Channel Charge-Pump LED Driver
Operating Current vs. Input Voltage
(VD1 = VD2 = VD3 = 0V)
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
2.5
3
3.5 4
-40°C
25°C
85°C
4.5 5
5.5
Input Voltage (V)
LED Current Matching vs. Temperature
21.0
20.5
20.0
19.5
19.0
-40
D1
D2
D3
-15 10 35 60
Temperature (°C)
85
ILED Full Scale vs. RSET
35
28
21
14
7
0
8 13 18 23 28 33
RSET (kΩ)
3103.2008.03.1.0
www.analogictech.com
5

5 Page





AAT3103 arduino
ChargePumpTM
Applications Information
LED Selection
The AAT3103 is specifically intended for driving WLEDs.
However, the device design will allow the AAT3103 to
drive most types of LEDs with forward voltage specifica-
tions ranging from 2.2V to 4.7V. LED applications may
include mixed arrangements for display backlighting,
keypad display, and any other application needing a con-
www.DatasSthaenett4Ucu.crorment sink generated from a varying input volt-
age. Since the D1 to D3 constant current sources are
matched with negligible supply voltage dependence, the
constant current channels will be matched regardless of
the specific LED forward voltage (VF) levels.
The internal charge pump and low dropout current
sources in the AAT3103 maximize performance and
make it capable of driving LEDs with high forward volt-
ages. Multiple channels can be combined to obtain a
higher LED drive current without complication.
Constant Current Setting
The LED full scale current is controlled by the RSET resis-
tor. The following formula can be used to calculate the
AAT3103-1/2/4 full scale LED current:
ILED_FS
=
1.2
RSET
·
4
·
60
Table 4 shows the RSET resistor value for the AAT3103-1/2/4
for various LED full-scale current levels. For maximum
accuracy, a 1% tolerance resistor is recommended.
ILED_FS (mA)
30.2
20.1
15.1
10.0
RSET (kΩ)
9.53
14.3
19.1
28.7
Table 4: Maximum LED Current and RSET Resistor
Values (1% Resistor Tolerance) for the AAT3103.
The S2C interface rising edges control the LED current
from full scale to the LSB. For the AAT3103-1, 16 steps
are employed. Figure 5 shows the LED current of the
AAT3103-1 at different RSET values.
PRODUCT DATASHEET
AAT3103
3-Channel Charge-Pump LED Driver
35
30 RSET = 9.53k
25 RSET = 14.3k
20
RSET = 19.1k
15
10 RSET = 28.7k
5
0
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
S2C Wire Interface Data Code
Figure 5: AAT3103-1 LED Current Control Profile
at Different RSET Values.
Use the following formula to calculate the AAT3103-3 full
scale LED current:
ILED_FS
=
1.2
RSET
·
4
·
48
For example, an 11.5kΩ 1% resistor is used to achieve
20mA full scale LED current operation.
Device Switching Noise Performance
The AAT3103 operates at a fixed frequency of approxi-
mately 0.9MHz to control noise and limit harmonics that
can interfere with the RF operation of mobile communi-
cation devices. Back-injected noise appearing on the
input pin of the charge pump is 20mV peak-to-peak,
typically ten times less than inductor-based DC/DC boost
converter WLED backlight solutions. The AAT3103's soft-
start feature prevents noise transient effects associated
with inrush currents during start-up of the charge pump
circuit.
Shutdown
To activate the shutdown operation, the EN/SET input for
the AAT3103-1/-2 should be pulsed low for longer than
tOFF (500μs). For the 3103-4 PWM options, shutdown
operation is enabled when the EN/PWM input is pulsed
low longer than 500μs. In this state, the AAT3103 typi-
cally draws less than 1μA from the input. Registers are
reset to 0 in shutdown.
3103.2008.03.1.0
www.analogictech.com
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