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PDF AAT3113ITP-20-T1 Data sheet ( Hoja de datos )

Número de pieza AAT3113ITP-20-T1
Descripción High Efficiency 1.5X Fractional Charge Pumps For White LED Applications
Fabricantes Advanced Analogic Technologies 
Logotipo Advanced Analogic Technologies Logotipo



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AAT3113, AAT3114/14A
High Efficiency 1.5X Fractional Charge
Pumps For White LED Applications
General Description
Features
ChargePump
The AAT3113 and AAT3114/14A are low noise, con-
• AAT3113: Four Outputs
stant frequency charge pump DC/DC converters
• AAT3114/14A: Six Outputs
that use fractional (1.5X) conversion to increase effi-
• 20mA Full-Scale Current
ciency in white LED applications. The devices can
• Simple Serial Control (S2Cwire) Interface
be used to produce current levels up to 20mA for
— 32-Position Logarithmic Scale with Digital
each output from a 2.7V to 5.5V input. A low exter-
Control
nal parts count (two 1µF flying capacitors and two
• Low Noise Constant Frequency Operation
small bypass capacitors at VIN and OUT) makes
these devices ideally suited for small, battery-pow-
• 33% Less Input Current Than Doubler
Charge Pump
ered applications.
• High Accuracy Brightness Matching
AnalogicTech’s Simple Serial Control™ (S2Cwire™)
interface is used to enable, disable, and set the
LED drive current for 32-level logarithmic scale LED
brightness control. AAT3113 and AAT3114/14A
devices have a thermal management system for
protection in the event of a short-circuit condition on
any of the output pins. Built-in soft-start circuitry
prevents excessive inrush current during start-up.
A high switching frequency enables the use of small
external capacitors. A low-current shutdown feature
• Small Application Circuit
• Regulated Output Current
• Automatic Soft Start
• VIN Range: 2.7V to 5.5V
• No Inductors
• 600kHz Switching Frequency
• IQ <1µA in Shutdown
• Temperature Range: -40°C to 85°C
• 12-Pin TSOPJW Package (AAT3113)
• 16-Pin QFN Package (AAT3114/14A)
disconnects the load from VIN and reduces quies-
cent current to less than 1µA. The AAT3113 pro-www.DataSheet4U.com
vides four LED current source outputs, and the
AAT3114/14A provides six. The AAT3113 is avail-
Applications
able in a Pb-free 12-pin TSOPJW package, and the
AAT3114/14A is available in a Pb-free 16-pin QFN
package.
• Programmable Current Source
• White LED Backlighting
Typical Application
VBATTERY
CIN COUT
1μF 1μF
EN/SET
VIN C1+
OUT
C1-
C2+
AAT3114/14A
C2-
EN/SET
GND
D1
D2
D3
D4
D5
D6
C1
1μF
C2
1μF
D6 D5 D4 D3 D2 D1
3113.2006.07.1.9
1

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AAT3113ITP-20-T1 pdf
AAT3113, AAT3114/14A
High Efficiency 1.5X Fractional Charge
Pumps For White LED Applications
Typical Characteristics
VIN = 3.5V, CIN = COUT = C1 = C2 = 1µF; TA = 25°C, unless otherwise noted.
Quiescent Current vs. Temperature
1.00
0.98
0.96
0.94
0.92
0.90
0.88
0.86
-40 -20 0 20 40 60 80 100
Temperature (°C)
Efficiency vs. Supply Voltage
100
30mA
95
90
85
40mA
80
75
120mA
70
65
60
3.0
3.2
20mA
60mA
80mA
3.4 3.6 3.8 4.0
Supply Voltage (V)
4.2
4.4
Quiescent Current vs. Supply Voltage
1.2
1.1
1.0
0.9
0.8
0.7
0.6
3.0
3.5 4.0
4.5 5.0
Supply Voltage (V)
5.5
Efficiency vs. Load Current
96
94
92
90
88
86
84
82
80
0
20 40 60 80 100 120
Load Current (mA)
Shutdown Current vs. Temperature
1.000
0.100
0.010
0.001
-40
-20
0 20 40 60
Temperature (°C)
80 100
3113.2006.07.1.9
Oscillator Frequency vs. Temperature
710
700
690
680
670
660
650
640
630
620
610
-40 -20 0 20 40 60 80 100
Temperature (°C)
5

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AAT3113ITP-20-T1 arduino
AAT3113, AAT3114/14A
High Efficiency 1.5X Fractional Charge
Pumps For White LED Applications
current drops below 0.05mA or when the level of
VIN approaches VOUT. Refer to the Typical
Characteristics section of this datasheet for meas-
ured plots of efficiency versus input voltage and
output load current for the given charge pump out-
put voltage options.
Power Efficiency and Device Evaluation
The charge pump efficiency discussion in the previ-
ous section only accounts for efficiency of the
charge pump section itself. Due to the unique cir-
cuit architecture and design of the AAT3113 and
AAT3114/14A, it is very difficult to measure efficien-
cy in terms of a percent value comparing input
power over output power. Since the device outputs
are pure constant current sources, it is difficult to
measure the output voltage for a given output (D1
to D6) to derive an output power measurement. For
any given application, white LED forward voltage
levels can differ, yet the output drive current will be
maintained as a constant. This makes quantifying
output power a difficult task when taken in the con-
text of comparing to other white LED driver circuit
topologies. A better way to quantify total device effi-
ciency is to observe the total input power to the
device for a given LED current drive level. The best
white LED driver for a given application should be
based on trade-offs of size, external components
count, reliability, operating range, and total energy
usage...not just "% efficiency."
700
600
500
400
300
200
100
0
0
AAT3113/AAT3114 Input Power
vs. LED Current
VIN = 3.6V
20 40 60 80 100
Output (LED) Current (mA)
120
140
Capacitor Selection
Careful selection of the four external capacitors
CIN, C1, C2, and COUT is important because they will
affect turn-on time, output ripple, and transient per-
3113.2006.07.1.9
formance. Optimum performance will be obtained
when low equivalent series resistance (ESR)
ceramic capacitors are used. In general, low ESR
may be defined as less than 100mΩ. A value of
1µF for all four capacitors is a good starting point
when choosing capacitors. If the LED current
sources are only programmed for minimal current
levels, then the capacitor size may be decreased.
Capacitor Characteristics
Ceramic composition capacitors are highly recom-
mended over all other types of capacitors for use
with the AAT3113 and AAT3114/14A products.
Ceramic capacitors offer many advantages over
their tantalum and aluminum electrolytic counter-
parts. A ceramic capacitor typically has very low
ESR, is lowest cost, has a smaller PCB footprint,
and is non-polarized. Low ESR ceramic capacitors
help maximize charge pump transient response.
Since ceramic capacitors are non-polarized, they
are not prone to incorrect connection damage.
Equivalent Series Resistance: ESR is an impor-
tant characteristic to consider when selecting a
capacitor. ESR is a resistance internal to a capac-
itor that is caused by the leads, internal connec-
tions, size or area, material composition, and ambi-
ent temperature. Capacitor ESR is typically meas-
ured in milliohms for ceramic capacitors and can
range to more than several ohms for tantalum or
aluminum electrolytic capacitors.
Ceramic Capacitor Materials: Ceramic capacitors
less than 0.1µF are typically made from NPO or
C0G materials. NPO and C0G materials generally
have tight tolerance and are very stable over tem-
perature. Larger capacitor values are usually com-
posed of X7R, X5R, Z5U, or Y5V dielectric materi-
als. Large ceramic capacitors (i.e., greater than
2.2µF) are often available in low-cost Y5V and Z5U
dielectrics, but capacitors greater than 1µF are not
typically required for AAT3113 or AAT3114/14A
applications.
Capacitor area is another contributor to ESR.
Capacitors that are physically large will have a lower
ESR when compared to an equivalent material
smaller capacitor. These larger devices can improve
circuit transient response when compared to an
equal value capacitor in a smaller package size.
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