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PDF AAT3119 Data sheet ( Hoja de datos )
| Número de pieza | AAT3119 | |
| Descripción | High Efficiency 2X Charge Pump | |
| Fabricantes | AAT | |
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AAT3119
High Efficiency 2X Charge Pump
General Description
Features
ChargePump™
The AAT3119 is a general purpose high efficiency
voltage regulated charge pump IC that can produce
• VIN Range: 2.7V to 5.5V
• 150mA of Output Current
output current levels up to 150mA. As a voltage
— Peak Current up to 250mA
regulated output device, it may be used for general
• Regulated Output Voltage
voltage boost applications or to power white, RGB,
• 1.2MHz Switching Frequency
or flash type LEDs from a 2.7V to 5.5V input.
• Low Noise Constant Frequency Operation
The voltage doubling charge pump architecture of
the AAT3119 provides for a low external part count;
just three small ceramic capacitors are needed.
This makes the AAT3119 ideally suited for small
battery-powered applications. This device oper-
ates from a fixed high frequency 1.2MHz oscillator
• <1.0μA of Shutdown Current
• Automatic Soft Start
• Small Application Circuit
• Inductorless Boost
• 8-Pin SC70JW Package
• -40°C to +85°C Temperature Range
which enables the use of very small external
capacitors, one 1μF flying capacitor, and two 1μF
bypass capacitors at IN and OUT.
The AAT3119 has built-in soft-start circuitry which
Applications
prevents excessive inrush current from the source
supply during startup. A low-current shutdown fea-
ture disconnects the load from VIN and reduces
quiescent current to less than 1.0μA when the
device is disabled. The AAT3119 is available in a
www.DataSheet4U.com
Pb-free, 8-pin SC70JW package and is rated over
the -40°C to +85°C temperature range.
•
•
•
•
•
•
Cellular Phones
Digital Cameras
Handheld Electronics
PDAs
White LED Backlighting
White LED Camera Flash
Typical Application
VIN
CIN
1μF
Enable
CFLY
1μF
C+
IN
C-
OUT
AAT3119
EN
GND
COUT
1μF
VOUT
3119.2007.02.1.2
1
1 page  
AAT3119
High Efficiency 2X Charge Pump
Typical Characteristics _ AAT3119-5V
Output Voltage vs. Output Current
5.4
5.2
5.0
4.8
4.6
4.4
4.2
4.0
0
VIN = 2.7
VIN = 3.6
VIN = 3.0 VIN = 3.3
40 80 120 160
Output Current (mA)
200
Supply Current vs. Supply Voltage
3.00
2.75
2.50
IOUT = 0μA
CFLY = 1μF
VEN = VIN
2.25
2.00
1.75
1.50
1.25
1.00
2.5
3.0
3.5 4.0 4.5
Supply Voltage (V)
5.0
Supply Current vs. VEN
5
IOUT = 0μA
4
3
2 VIN = 2.8V
1
0
0
1
VIN = 3.3V
VIN = 5.5V
23 4 5
VEN Control Voltage (V)
6
Efficiency vs. Supply Voltage
100
90 50mA
80
70
60 100mA
50 150mA
40
30
20
10
0
2.7
3.0
3.3 3.6 3.9
Supply Voltage (V)
4.2
4.5
Efficiency vs. Load Current
100
90
80
70
60
50
40
30
20
10
0
0.1
VIN = 3.0V
VIN = 2.7V
VIN = 3.6V
VIN = 3.3V
1.0 10 100
Load Current (mA)
1000
Oscillator Frequency vs. Supply Voltage
1.30
1.25
+25°C
1.20 +85°C
1.15 -40°C
1.10
2.7
3.2 3.7 4.2
Supply Voltage (V)
4.7
3119.2007.02.1.2
5
5 Page 
In the operating state, the AAT3119 typically con-
sumes 2mA of quiescent operating current. The
enable pin (EN) is an active high input. When
pulled low, the AAT3119 is shut down, the quies-
cent current drops to less than 1μA, and the output
is disconnected from the input.
Charge Pump Efficiency
The core of the AAT3119 is a regulated output volt-
age doubling charge pump. The efficiency (η) for
an ideal voltage doubling charge pump can typical-
ly be expressed as the output power divided by the
input power:
η
=
POUT
PIN
In addition, with an ideal voltage doubling charge
pump, the output current may be expressed as half
the input current. The expression to define the ideal
efficiency (η) can be rewritten as:
η
=
POUT
PIN
=
VOUT × IOUT
VIN × 2IOUT
=
VOUT
2VIN
-or-
η(%)
=
100
⎛
⎝
VOUT
2VIN
⎞
⎠
For a charge pump with an output of 5.0 volts and
a nominal input of 3.0 volts, the theoretical efficien-
cy is 83.3%. Due to internal switching losses and
IC quiescent current consumption, the actual effi-
ciency can be measured at approximately 82%.
Efficiency will decrease as the level of VIN
approaches that of the regulated VOUT. Refer to
the device typical characteristics curves for expect-
ed actual efficiency based on either input voltage or
load current.
AAT3119
High Efficiency 2X Charge Pump
Capacitor Selection
Careful selection of the three external capacitors
(CIN, CFLY, and COUT) is important because they will
affect turn-on time, output ripple, efficiency, and
load transient response. 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 three capacitors is a good starting
point when designing with the AAT3119. This not
only provides for a very small printed circuit board
area, but cost is further reduced by the minimized
bill of materials.
Input Capacitor
A 1μF multilayer ceramic chip capacitor is suggest-
ed for the input. This capacitor should be connect-
ed between the IN pin and ground. 1μF should be
suitable for most applications. Even though the
AAT3119 switching ripple and noise are very low,
back-injected line noise may be further reduced by
increasing the value of CIN. Other types of capaci-
tors may be used for CIN at the cost of compro-
mised circuit performance.
Output Capacitor
The output capacitor (COUT) should be connected
between the OUT pin and ground. A 1μF ceramic
capacitor is also suggested in this position.
Switching noise and ripple seen on the charge
pump output increases with load current. Typically
1μF is sufficient for minimizing output ripple seen
by the load circuit. If the load current in an appli-
cation is low, or if higher levels of switching ripple
can be tolerated, COUT can be reduced as low as
0.33μF. If application circuits with greater load cur-
rent demands require lower switching ripple ampli-
tudes, COUT may be increased to values above
1μF. Capacitor types other than ceramic capaci-
tors can be used for COUT. However, capacitors
comprised of materials other than ceramic will typ-
ically have a greater value of ESR, resulting in
increased output switching ripple.
3119.2007.02.1.2
11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet AAT3119.PDF ] | |
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