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PDF AAT3340 Data sheet ( Hoja de datos )
| Número de pieza | AAT3340 | |
| Descripción | High Efficiency 1x/1.5x Charge Pump | |
| Fabricantes | Advanced Analogic Technologies | |
| Logotipo |  |
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ChargePumpTM
General Description
The AAT3340 is a low-noise, constant-frequency charge
pump DC/DC converter that uses a dual-mode load switch
(1x) and fractional (1.5x) conversion to maximize effi-
ciency for white LED applications. The AAT3340 is capable
of driving 4 white LEDs at a total of 80mA from a single
2.7V to 5.5V input. The current sinks may be operated
individually or in parallel while driving higher-current
LEDs. A low external parts count (two 1μF flying capacitors
and two small 1μF capacitors at VIN and VOUT) makes the
AAT3340 ideal for small battery-powered applications.
Analogic Tech’s Simple Serial Control (S2Cwire) digital
interface is used to enable, disable and set current to
one of 32 levels for the LEDs.
The AAT3340 is equipped with built-in short-circuit and
over-temperature protection. The soft-start circuitry pre-
vents excessive inrush current at start-up and mode
transitions. The AAT3340 family is available in Pb-free,
space-saving TSOPJW and TDFN33 packages, and oper-
ates over the -40°C to +85°C ambient temperature
range.
PRODUCT DATASHEET
AAT3340
High Efficiency 1x/1.5x Charge Pump
Features
• Dual-Mode (1x/1.5x) Charge Pump
• Drives up to 4-Channel Backlight LEDs
• 32-Level Programmable Backlight Current (linear,
inverting)
• Single-wire S2Cwire Control
• Built-in Thermal Protection
• Automatic Soft Start
• -40°C to +85°C Temperature Range
• TSOPJW-12 and TDFN33-12 Packages
Applications
• Cellular and Smart Phones
• Digital Still and Video Cameras
• PDAs
• Portable Devices
• Portable Media Players
• Other White LED Backlighting
Typical Application
C1
1μF
VBATTERY
3.6V
CIN
1μF
EN/SET
S2Cwire Serial Control
C1+ C2+
C1- C2-
IN OUT
AAT3340
EN/SET
BL1
BL2
BL3
BL4
GND
C2
1μF
D1 D2 D3 D4
COUT
1μF
3340.2008.07.1.1
www.analogictech.com
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1 page  
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ChargePumpTM
PRODUCT DATASHEET
AAT3340
High Efficiency 1x/1.5x Charge Pump
Typical Characteristics
VIN = 3.6V, CIN = COUT = C1 = C2 = 1μF; TA = 25°C, unless otherwise noted.
No Load Operating Current (1.5x Mode)
vs. Input Voltage
4.4
4.2
4.0
3.8
3.6
85°C
60°C
3.4
40°C
25°C
0°C
3.2 -20°C
-40°C
3.0
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
Input Voltage (V)
No Load Operating Current (1x Mode)
vs. Input Voltage
1.8
1.7
1.6
1.5
1.4
1.3
2.7
3.1
3.5 3.9 4.3 4.7
Input Voltage (V)
85°C
60°C
40°C
25°C
0°C
-20°C
-40°C
5.1 5.5
Shutdown Current vs. Temperature
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
-40
VIN = 5.5V
VIN = 2.7V
-15 10
35
Temperature (°C)
60
85
Efficiency vs. Input Voltage
(Code 26, ILED = 3.8mA)
100
VF = 3.3V
VF = 3V
85 VF = 2.7V
70
55
40
2.7
3.1
3.5 3.9 4.3 4.7
Input Voltage (V)
5.1 5.5
1.5X Mode Output Voltage vs. Output Current
5.2
5.1
5
4.9
4.8
4.7
4.6
4.5
0
VIN = 3.6V
VIN = 3.3V
20 40 60 80 100 120
Output Current (mA)
Efficiency vs. Input Voltage
(Code 1, BL = 20mA)
100
VF = 3.3V
VF = 3V
85 VF = 2.7V
70
55
40
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
Input Voltage (V)
3340.2008.07.1.1
www.analogictech.com
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ChargePumpTM
Equivalent Series Resistance
ESR is an important characteristic to consider when
selecting a capacitor. ESR is a resistance internal to a
capacitor that is caused by the leads, internal connec-
tions, size or area, material composition, and ambient
temperature. Capacitor ESR is typically measured in mil-
liohms 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
have tight tolerance and are stable over temperature.
Capacitors with large values are typically composed of
X7R, X5R, Z5U, or Y5V dielectric materials.
Large ceramic capacitors, greater than 2.2μF, are often
available in low-cost Y5V and Z5U dielectrics, but capac-
itors greater than 1μF are usually not required for
AAT3340 applications.
PRODUCT DATASHEET
AAT3340
High Efficiency 1x/1.5x Charge Pump
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.
Thermal Protection
The AAT3340 has a built-in thermal protection circuit
that will shut down the charge pump if the die tempera-
ture rises above the thermal limit, as is generally the
case during short-circuit event of the VOUT pin.
Evaluation Board Layout
When designing a PCB for the AAT3340, the key require-
ments are:
1. Place the two flying capacitors, C1 and C2, as close
to the chip as possible, otherwise the 1.5X mode
performance will be compromised.
2. Place the input and output decoupling capacitors as
close to the chip as possible to reduce switching
noise and output ripple.
3340.2008.07.1.1
www.analogictech.com
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| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet AAT3340.PDF ] | |
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