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PDF AAT3110IGU-33-T1 Data sheet ( Hoja de datos )
| Número de pieza | AAT3110IGU-33-T1 | |
| Descripción | MicroPower Regulated Charge Pump | |
| Fabricantes | Advanced Analogic Technologies | |
| Logotipo |  |
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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
1 page  
AAT3110
MicroPower™ Regulated Charge Pump
Typical Characteristics—AAT3110-5
(Unless otherwise noted, VIN = 3V, CIN=COUT=10µF, CFLY=1µF, TA = 25ºC)
Output Voltage vs. Output Current
AAT3110-5
5.15
5.1 VIN=3.6
5.05
5
4.95
VIN=2.7
4.9
VIN=3.0
VIN=3.3
4.85
4.8
0
50 100
Output Current (mA)
150
Supply Current vs. Supply Voltage
AAT3110-5
24 IOUT=0 A
22 CFLY=1µF
20 VSHDN=VIN
18
16
14
12
10
2.5 3 3.5 4 4.5 5 5.5
Supply Voltage (V)
Supply Current vs VSHDN
AAT3110-5
30
25
VIN=5.5V
IOUT=0µA
20
VIN=3.3V
15
10 VIN=2.8V
5
0
0 12 3 4 5
VSHDN Control Voltage (V)
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
0%
0.01
Efficiency vs. Load Current
AAT3110-5
VIN = 2.7V
VIN = 3.6V
VIN = 3.0V
VIN = 3.3V
0.1 1 10 100
Load Current (mA)
1000
3110.2001.9.0.92
Efficiency vs. Supply Voltage
AAT3110-5
95%
90% 25 mA
85%
80%
75%
70% 50 mA
65%
60%
55%
100 mA
50%
45%
2.70
3.00
3.50
4.00
4.50
Supply Voltage (V)
5.00
Oscillator Frequency vs. Supply Voltage
AAT3110-5
1200
1100
1000 - 40º C
900
800
700 25º C
600
500 85º C
400
2.7 3.0 3.5 4.0 4.5
5.0
Supply Voltage (V)
5
5 Page 
Functional Block Diagram
AAT3110
MicroPower™ Regulated Charge Pump
VIN
SHDN
CONTROL
S2
VREF
S4
-
+
S1
C+
C-
S3
VOUT
Functional Description
Operation (Refer to block diagram)
The AAT3110 uses a switched capacitor charge
pump to boost an input voltage to a regulated output
voltage. Regulation is achieved by sensing the
charge pump output voltage through an internal
resistor divider network. A switched doubling circuit
is enabled when the divided output drops below a
preset trip point controlled by an internal comparator.
The charge pump switch cycling enables four inter-
nal switches at two non-overlapping phases. During
the first phase, switches S1 and S4 are switched on
(short) and switches S2 and S3 are off (open). The
flying capacitor CFLY is charged to a level approxi-
mately equal to input voltage VIN. On the second
phase, switches S1 and S4 are turned off (open), S2
and S3 are turned on (short). The low side of the fly-
ing capacitor CFLY is connected to GND during the
first phase. During the second phase, the flying
capacitor CFLY is switched so that the low side is
connected to VIN. The voltage at the high side of the
flying capacitor CFLY is bootstrapped to 2×VIN and
connected to output through a switch. For each
cycle phase, charge from input node VIN is trans-
ported from a lower voltage to a higher voltage. This
cycle repeats itself until the output node voltage is
high enough to exceed the preset input threshold of
the control comparator. When the output voltage
exceeds the internal trip point level, the switching
cycle stops and the charge pump circuit is tem-
3110.2001.9.0.92
GND
porarily placed in an idle state. When idle, the
AAT3110 has a quiescent current of 13µA or less.
The closed loop feed back system containing the
voltage sense circuit and control comparator allows
the AAT3110 to provide a regulated output voltage to
the limits of the input voltage and output load cur-
rent. The switching signal, which drives the charge
pump is created by an integrated oscillator within the
control circuit block. The free running charge pump
switching frequency is approximately 750kHz. The
switching frequency under an active load is a func-
tion of VIN, VOUT, COUT and IOUT.
For each phase of the switching cycle, the charge
transported from VIN to VOUT can be approximated
by the following formula:
VPHASE ≈ CFLY×(2×VIN-VOUT)
The relative average current that the charge pump
can supply to the output may be approximated by
the following expression:
IOUT(AVG) α CFLY×(2×VIN-VOUT)×FSW
The AAT3110 has complete output short circuit and
thermal protection to safeguard the device under
extreme operating conditions. An internal thermal
protection circuit senses die temperature and will
shut down the device if the internal junction temper-
ature exceeds approximately 145°C. The charge
pump will remain disabled until the fault condition is
relieved.
11
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| PDF Descargar | [ Datasheet AAT3110IGU-33-T1.PDF ] | |
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