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PDF AAT1153 Data sheet ( Hoja de datos )
| Número de pieza | AAT1153 | |
| Descripción | 2A Step-Down Converter | |
| Fabricantes | Advanced Analogic Technologies | |
| Logotipo |  |
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General Description
The AAT1153 SwitchReg™ is a 1.2MHz constant fre-
quency current mode PWM step-down converter. It is
ideal for portable equipment requiring very high current
up to 2A from single-cell Lithium-ion batteries while still
achieving over 90% efficiency during peak load condi-
tions. The AAT1153 also can run at 100% duty cycle for
low dropout operation, extending battery life in portable
systems while light load operation provides very low
www.DataoSuhetpetu4tU.rciopmple for noise sensitive applications.
The AAT1153 can supply up to 2A output load current
from a 2.5V to 5.5V input voltage and the output voltage
can be regulated as low as 0.6V. The high switching fre-
quency minimizes the size of external components while
keeping switching losses low. The internal slope compen-
sation setting allows the device to operate with smaller
inductor values to optimize size and provide efficient
operation.
The AAT1153 is available in adjustable (0.6V to VIN) and
fixed (1.8V) output voltage versions. The device is avail-
able in a Pb-free, 3mm x 3mm 10-lead TDFN package
and is rated over the -40°C to +85°C temperature
range.
PRODUCT DATASHEET
AAT1153
2A Step-Down Converter
Features
• Input Voltage Range: 2.5V to 5.5V
• Output Voltages from 0.6V to VIN
• 2A Output Current
• High Efficiency: Up to 95%
• 1.2MHz Constant Switching Frequency
• Low RDS(ON) Internal Switches: 0.15Ω
• Allows Use of Ceramic Capacitors
• Current Mode Operation for Excellent Line and Load
Transient Response
• Short-Circuit and Thermal Fault Protection
• Soft Start
• Low Dropout Operation: 100% Duty Cycle
• Low Shutdown Current: ISHUTDOWN < 1μA
• TDFN33-10 Package
• -40°C to +85°C Temperature Range
Applications
• Cellular Phones
• Digital Cameras
• DSP Core Supplies
• PDAs
• Portable Instruments
• Smart Phones
Typical Application
VIN 2.5V-5.5V
C1
22μF
1
EN
2 IN
3 AIN
LX 8
AAT1153-1.8 LX 7
OUT 5
6 AGND
4 AGND
PGND 10
PGND 9
L1
2.2μH
VOUT
1.8V, 2A
C2
22μF
1153.2007.11.1.1
www.analogictech.com
1
1 page  
Typical Characteristics
Efficiency vs. Output Current
(VOUT = 3.3V, TA = 25°C, L = 2.2µH, CIN = COUT = 22µF)
100
90
80
70
60
50
40
www.DataSheet4U.com
30
20
10
0
0.1
VIN = 4.2V
VIN = 3.7V
1 10
VIN = 5.5V
VIN = 5.0V
100 1000
10000
Output Current (mA)
Efficiency vs. Output Current
(VOUT = 1.8V, TA = 25°C, L = 2.2µH, CIN = COUT = 22µF)
100
90 VIN = 4.2V
80 VIN = 3.6V
70 VIN = 2.5V
60
50
VIN = 5.5V
VIN = 5.0V
40
30
20
10
0
0.1 1
10 100 1000
10000
Output Current (mA)
Efficiency vs. Output Current
(VOUT = 1.5V, TA = 25°C, L = 2.2µH, CIN = COUT = 22µF)
100
90 VIN = 4.2V
80
70
VIN = 3.6V
60 VIN = 2.5V
50 VIN = 5.5V
40
30 VIN = 5.0V
20
10
0
0.1 1
10 100
1000
10000
Output Current (mA)
PRODUCT DATASHEET
AAT1153
2A Step-Down Converter
DC Regulation
(VOUT = 3.3V, TA = 25°C, L = 2.2µH, CIN = COUT = 22µF)
3.399
3.366
3.333
VIN = 5.5V VIN = 5.0V
3.300
3.267
VIN = 3.7V
VIN = 4.2V
3.234
3.201
0
200 400 600 800 1000 1200 1400 1600 1800 2000
Output Current (mA)
DC Regulation
(VOUT = 1.8V, TA = 25°C, L = 2.2µH, CIN = COUT = 22µF)
1.854
1.836
1.818
1.800
VIN = 4.2V VIN = 5.0V
VIN = 5.5V
1.782
1.764
VIN = 3.6V
VIN = 2.5V
1.746
0
200 400 600 800 1000 1200 1400 1600 1800 2000
Output Current (mA)
DC Regulation
(VOUT = 1.5V, TA = 25°C, L = 2.2µH, CIN = COUT = 22µF)
1.545
1.530
1.515 VIN = 4.2V
1.500
VIN = 5.0V
VIN = 5.5V
1.485
1.470
VIN = 3.6V
VIN = 2.5V
1.455
0
200 400 600 800 1000 1200 1400 1600 1800 2000
Output Current (mA)
1153.2007.11.1.1
www.analogictech.com
5
5 Page 
Applications Information
VIN 2.5V-5.5V
C1
22μF
1
EN
2 IN
3 AIN
LX
LX
AAT1153-0.6 FB
8
7
5
6 AGND
4 AGND
PGND 10
PGND 9
L1
2.2μH
C3
22pF
VOUT
1.8V, 2A
R1
634kΩ C2
22μF
R2
316kΩ
www.DataSheet4FUi.gcoumre 1: Basic Application Circuit for the
Adjustable Output Version.
VIN 2.5V-5.5V
C1
22μF
1
EN
2 IN
LX 8
LX 7
3 AIN AAT1153-1.8 OUT 5
6 AGND
4 AGND
PGND 10
PGND 9
L1
2.2μH
VOUT
1.8V, 2A
C2
22μF
Figure 2: Basic Application Circuit for the Fixed
Output Versions.
Setting the Output Voltage
Figure 1 shows the basic application circuit with the
AAT1153 adjustable output version while Figure 2 shows
the application circuit with the AAT1153 fixed output ver-
sion. For applications requiring an adjustable output
voltage, the AAT1153-0.6 adjustable version can be
externally programmed. Resistors R1 and R2 in Figure 1
program the output to regulate at a voltage higher than
0.6V. To limit the bias current required for the external
feedback resistor string while maintaining good noise
immunity, the minimum suggested value for R2 is 59kΩ.
Although a larger value will further reduce quiescent cur-
rent, it will also increase the impedance of the feedback
node, making it more sensitive to external noise and
interference. Table 1 summarizes the resistor values for
various output voltages with R2 set to either 59kΩ for
good noise immunity or 316kΩ for reduced no load input
current.
The adjustable version of the AAT1153, combined with
an external feed forward capacitor (C3 in Figure 1),
delivers enhanced transient response for extreme pulsed
load applications. The addition of the feed forward
capacitor typically requires a larger output capacitor C2
PRODUCT DATASHEET
AAT1153
2A Step-Down Converter
for stability. The external resistor sets the output voltage
according to the following equation:
VOUT = 0.6V ·
⎛⎝1 +
R1 ⎞
R2 ⎠
R1 =
⎛
⎝
VOUT
0.6V
-
1⎞⎠
· R2
Table 1 shows the resistor selection for different output
voltage settings.
VOUT (V)
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.8
1.85
2.0
2.5
3.3
R2 = 59kΩ
R1 (kΩ)
19.6
29.4
39.2
49.9
59.0
68.1
78.7
88.7
118
124
137
187
267
R2 = 316kΩ
R1 (kΩ)
105
158
210
261
316
365
422
475
634
655
732
1000
1430
Table 1: Resistor Selections for Different Output
Voltage Settings (Standard 1% Resistors
Substituted For Calculated Values).
Inductor Selection
For most designs, the AAT1153 operates with inductor
values of 1μH to 4.7μH. Low inductance values are
physically smaller but require faster switching, which
results in some efficiency loss. The inductor value can
be derived from the following equation:
L = VOUT · (VIN - VOUT)
VIN · ΔIL · fOSC
Where ΔIL is inductor ripple current. Large value induc-
tors lower ripple current and small value inductors result
in high ripple currents. Choose inductor ripple current
approximately 30% of the maximum load current 2A, or
ΔIL = 600mA
1153.2007.11.1.1
www.analogictech.com
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet AAT1153.PDF ] | |
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