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AAT3110-33 Schematic ( PDF Datasheet ) - Advanced Analogic Technologies

Teilenummer AAT3110-33
Beschreibung MicroPower Regulated Charge Pump
Hersteller Advanced Analogic Technologies
Logo Advanced Analogic Technologies Logo 




Gesamt 18 Seiten
AAT3110-33 Datasheet, Funktion
General Description
The AAT3110 ChargePump™ is a MicroPower
switched-capacitor voltage converter that delivers
a regulated output. No external inductor is required
for operation. Using three small capacitors, the
AAT3110 can deliver up to 150mA to the voltage
regulated output. The AAT3110 features very low
quiescent current and high efficiency over a large
portion of its load range making this device ideal
for battery-powered applications. Furthermore, the
combination of few external components and small
package size keeps the total converter board area
to a minimum in space restricted applications. The
AAT3110 operates in an output-regulated voltage
doubling mode. The regulator uses a pulse-skip-
ping technique to provide a regulated output from a
varying input supply. The AAT3110 contains a ther-
mal management circuit to protect the device
under continuous output short circuit conditions.
The AAT3110 is available in a surface mount 6-pin
SOT23 or 8-pin SC70JW package and is rated
from -40 to 85°C.
The AAT3110 ChargePump™ is a member of
AnalogicTech's Total Power Management IC prod-
uct family.
AAT3110
MicroPower™ Regulated Charge Pump
Features
ChargePump
• Step-up type voltage converter
• Input Range
• AAT3110-5: 2.7V to 5V
• AAT3110-3.3: 2.3V to 3.3V
• MicroPower consumption: 13µA
• 5V, 3.3V Regulated ±4% output
• 5V Output Current
• 100mA with VIN 3.0V
• 50mA with VIN 2.7V
• 3.3V Output Current
• 150mA with VIN 2.7V
• 100mA with VIN 2.3V
• High Frequency 750 kHz operation
• Shutdown mode draws less than 1µA
• Short-circuit/over-temperature protection
• 2kV ESD Rating
• SC70JW-8 or SOT23-6 package
Applications
• Cellular Phones
• Portable Communication Devices
• Handheld Electronics
• Digital Cameras
• PDAs
• Battery Back Up Supplies
• LED/Display Back Light Driver
Typical Operating Circuits
VOUT
COUT
10uF
ON/OFF
AAT3110
VOUT
C+
GND
VIN
SHDN
C-
1uF
VIN
CIN
10uF
3110.2001.9.0.92
1






AAT3110-33 Datasheet, Funktion
AAT3110
MicroPower™ Regulated Charge Pump
Typical Characteristics—AAT3110-5
(Unless otherwise noted, VIN = 3V, CIN=COUT=10µF, CFLY=1µF, TA = 25ºC)
Startup Time with 50 mA Load
AAT3110-5
Startup Time with 100 mA Load
AAT3110-5
SHDN
2V/DIV
SHDN
2V/DIV
VOUT
1V/DIV
50µS/DIV
Load Transient Response for 50mA
AAT3110-5
IOUT
0mA to
50mA
20mA/DIV
VIN=3.0V
VOUT
AC
COUPLED
20mV/DIV
50µS/DIV
Output Ripple with IOUT=50 mA
AAT3110-5
VOUT
AC
Coupled
10 mV/DIV
VIN=3.0V
2µS/DIV
6
VOUT
1V/DIV
50µS/DIV
Load Transient Response for 100mA
AAT3110-5
IOUT
0mA to
100 mA
50mA/DIV
VOUT
AC
COUPLED
20mV/DIV
VIN=3.0V
50µS/DIV
Output Ripple with IOUT=100 mA
AAT3110-5
VOUT
AC
Coupled
10 mV/DIV
VIN=3.0V
2µS/DIV
3110.2001.9.0.92

6 Page









AAT3110-33 pdf, datenblatt
AAT3110
MicroPower™ Regulated Charge Pump
Applications Information
External Capacitor Selection
Careful selection of the three external capacitors
CIN, COUT and CFLY is very important because they
will affect turn on time, output ripple and transient
performance. Optimum performance will be
obtained when low ESR (<100m) ceramic capaci-
tors are used for CIN and COUT and CFLY. In gener-
al, low ESR may be defined as less then 200m. If
desired for a particular application, low ESR
Tantalum capacitors may be substituted; however
optimum output ripple performance may not be real-
ized. Aluminum Electrolytic capacitors are not rec-
ommended for use with the AAT3110 due the their
inherent high ESR characteristic.
Typically as a starting point, a capacitor value of
10µF should be used for CIN and COUT with 1µF
CFLY when the AAT3110 is used under maximum
output load conditions. Lower values for CIN, COUT
and CFLY may be utilized for light load current appli-
cations. Applications drawing a load current of
10mA or less may use a CIN and COUT capacitor
value as low as 1µF and a CFLY value of 0.1µF. CIN
and COUT may range from 1µF for light loads to
10µF or more for heavy output load conditions.
CFLY may range from 0.01µF to 2.2µF or more. If
CFLY is increased, COUT should also be increased
by the same ratio to minimize output ripple. As a
basic rule, the ratio between CIN, COUT and CFLY
should not exceed a ratio of 10 to 1. The compro-
mise for lowering the value of CIN, COUT and the fly-
ing capacitor CFLY is the output ripple voltage may
be increased. In any case, if the external capacitor
values deviate greatly from the recommendation of
CIN = COUT = 10µF and CFLY = 1µF, the AAT3110
output performance should be evaluated to assure
the device meets the application requirements.
In applications where the input voltage source has
very low impedance, it is possible to omit the CIN
capacitor. However, if CIN is not used, circuit per-
formance should be evaluated to assure desired
operation is achieved. Under high peak current
operating conditions that are typically experienced
during circuit start up or when load demands create
a large inrush current, poor output voltage regula-
tion can result if the input supply source impedance
is high, or if the value of CIN is too low. This situa-
tion can be remedied by increasing the value of CIN.
Capacitor Characteristics
Ceramic composition capacitors are highly recom-
mended over all other types of capacitors for use
with the AAT3110. Ceramic capacitors offer many
advantages over their tantalum and aluminum elec-
trolytic counterparts. A ceramic capacitor typically
has very low ESR, is lower 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-polar-
ized, they are not prone to incorrect connection
damage.
Equivalent Series Resistance (ESR): ESR is a
very important characteristic to consider when
selecting a capacitor. ESR is a resistance internal
to a capacitor, which is caused by the leads, inter-
nal connections, size or area, material composition
and ambient temperature. Typically capacitor ESR
is measured in milliohms for ceramic capacitors
and can range to more then several ohms for tan-
talum or aluminum electrolytic capacitors.
Ceramic Capacitor Materials: Ceramic capacitors
less then 0.1µF are typically made from NPO or
COG materials. NPO and COG materials typically
have tight tolerance and are very stable over tem-
perature. 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. If these types of capacitors are
selected for use with the charge pump, the nominal
value should be doubled to compensate for the
capacitor tolerance which can vary more than ±50%
over the operating temperature range of the device.
A 10µF Y5V capacitor could be reduced to less than
5µF over temperature, this could cause problems
for circuit operation. X7R and X5R dielectrics are
much more desirable. The temperature tolerance
of X7R dielectric is better than ±15%.
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.
12 3110.2001.9.0.92

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