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AAT3119 Datasheet(PDF) 12 Page - Advanced Analogic Technologies

Part No. AAT3119
Description  High Efficiency 2X Charge Pump
Download  18 Pages
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Manufacturer  ANALOGICTECH [Advanced Analogic Technologies]
Direct Link  http://www.analogictech.com
Logo ANALOGICTECH - Advanced Analogic Technologies

AAT3119 Datasheet(HTML) 12 Page - Advanced Analogic Technologies

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AAT3119
High Efficiency 2X Charge Pump
12
3119.2007.02.1.2
Flying Capacitor
Due to the switching operation of the voltage dou-
bling circuit topology, current flow through the flying
capacitor is bi-directional.
The flying capacitor
selected must be a non-polarized type. A 1μF low
ESR ceramic capacitor is ideal for this application.
Capacitor Characteristics
Ceramic composition capacitors are highly recom-
mended over all other types of capacitors for use with
the AAT3119. Ceramic capacitors offer many advan-
tages over their tantalum and aluminum electrolytic
counterparts. 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 capaci-
tor that is determined by the leads, internal con-
nections, size or area, material composition, and
ambient temperature. Capacitor ESR is typically
measured 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 typically
have tight tolerance and are stable over tempera-
ture. Large capacitor values are typically com-
posed of X7R, X5R, Z5U, or Y5V dielectric materi-
als. Large ceramic capacitors, typically greater
than 2.2μF, are often available in low-cost Y5V and
Z5U dielectrics, but large capacitors are not
required in most AAT3119 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 capac-
itor. These larger devices can improve circuit tran-
sient response when compared to an equal value
capacitor in a smaller package size.
Applications Information
White LED Backlight Driver
LED Selection: In applications where the AAT3119
is utilized as a white LED backlight driver, LEDs
with forward voltages up to 5.0V may be used. The
AAT3119 is available in two regulated output volt-
age versions: 4.5V and 5.0V. The output voltage
option selected will determine the maximum LED
forward voltage that can be driven. The trade-off
for the lower 4.5V output voltage version is the
device’s ability to supply greater output current.
Refer to the "Output Voltage vs. Output Current"
curves in the Typical Characteristics section of this
datasheet to determine the best AAT3119 output
voltage option based on the requirements of a
given application.
LED Ballast Resistors: To set the maximum
brightness of white LEDs connected in parallel from
a voltage source supply, a ballast resistor connect-
ed between each LED cathode and ground is
required.
Refer to the application schematic in
Figure 1. The maximum brightness is determined
by the forward current (IF) through the respective
LED for a given forward voltage (VF). The typical
forward voltage of a specific LED is usually stated in
the typical characteristics of the given LED manu-
facturer's datasheet. The correct ballast resistor
value can be determined by the following equation:
Where:
RB
=
Ballast resistor value in ohms (
Ω)
VOUT =
Regulated charge pump output voltage
VF
=
LED forward voltage at the desired
forward current
IF
=
Desired LED forward current
R
B =
(V
OUT - VF)
I
F


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