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PDF AAT1149B Data sheet ( Hoja de datos )
| Número de pieza | AAT1149B | |
| Descripción | 2.2MHz Fast Transient 400mA Step-Down Converter | |
| Fabricantes | Skyworks | |
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DATA SHEET
AAT1149B
2.2MHz Fast Transient 400mA Step-Down Converter
General Description
The AAT1149B SwitchReg is a 2.2MHz step-down con-
verter with an input voltage range of 2.2V to 5.5V. It is
optimized to react quickly to load variations and operate
with a tiny 0603 inductor that is only 1mm tall.
The AAT1149B can deliver 400mA of load current while
maintaining a low 45μA no load quiescent current. The
2.2MHz switching frequency minimizes the size of exter-
nal components while keeping switching losses low.
The AAT1149B maintains high efficiency throughout the
operating range, which is critical for portable applica-
tions.
The AAT1149B is available in a Pb-free, space-saving
5-pin wafer-level chip scale (WLCSP) package and is
rated over the -40°C to +85°C temperature range.
Features
• Ultra-Small 0603 Inductor (Height = 1mm)
• VIN Range: 2.2V to 5.5V
• VOUT Fixed 1.8V
• 400mA Max Output Current
• Up to 98% Efficiency
• 45μA No Load Quiescent Current
• 2.2MHz Switching Frequency
• 70μs Soft Start
• Fast Load Transient
• Over-Temperature Protection
• Current Limit Protection
• 100% Duty Cycle Low-Dropout Operation
• <1μA Shutdown Current
• 0.91 x 1.235mm WLCSP Package
• Temperature Range: -40°C to +85°C
Applications
• Cellular Phones
• Digital Cameras
• Handheld Instruments
• Microprocessor / DSP Core / IO Power
• PDAs and Handheld Computers
• USB Devices
Typical Application
VIN = 3.6V
C2
4.7µF
U1
AAT1149B
IN LX
EN FB
AGND PGND
PGND PGND
VOUT = 1.8V
L1 2.2µH
C1
4.7µF
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201989B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 18, 2013
1
1 page  
DATA SHEET
AAT1149B
2.2MHz Fast Transient 400mA Step-Down Converter
Typical Characteristics
100
90
80
70
60
50
40
30
20
10
0
0.1
Efficiency vs. Output Current
(VOUT = 1.8V; L = 1.5µH)
VIN = 5.5V
VIN = 5V
VIN = 4.2V
VIN = 3.6V
VIN = 3V
VIN = 2.7V
VIN = 2.3V
1 10 100 1000
Output Current (mA)
2
1.5
1
0.5
0
-0.5
-1
-1.5
-2
0.1
Load Regulation
(VOUT = 1.8V; L = 1.5µH)
VIN = 5.5V
VIN = 5V
VIN = 4.2V
VIN = 3.6V
VIN = 3V
VIN = 2.7V
VIN = 2.3V
1
10
100
1000
10000
Output Current (A)
No Load Quiescent Current vs. Input Voltage
5
4.5
4
3.5
3
2.5
2 T = 85°C
1.5 T = 25°C
T = -40°C
1
2.5 3 3.5 4 4.5 5 5.5 6
Input Voltage (V)
Frequency Variation vs. Input Voltage
(VOUT = 1.8V)
2
1
0
-1
-2
-3
-4
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
Input Voltage (V)
Switching Frequency Variation vs. Temperature
10
8
6
4
2
0
-2
-4
-6
-8
-10
-40
-20
0 20 40 60 80
Temperature (°C)
100 120
Output Voltage Error vs. Temperature
(VIN = 3.6V; VO = 1.8V; IOUT = 400mA)
2.0
1.0
0.0
-1.0
-2.0
-40
-20
0 20 40 60
Temperature (°C)
80 100
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201989B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 18, 2013
5
5 Page 
DATA SHEET
AAT1149B
2.2MHz Fast Transient 400mA Step-Down Converter
Figure 1: AAT1149BIUV Evaluation Board
Top Side.
Figure 2: AAT1149BIUV Evaluation Board
Bottom Side.
VIN U1 L1
45
IN LX
EN
AAT1149BIUV
C3
open
2
EN
1
FB
C2
4.7μF
GND
3
R1
0
R2
open
VOUT
C1
4.7μF
WLCSP-5
Figure 3: AAT1149BIUV Evaluation Board Schematic.
Thermal Calculations
There are three types of losses associated with the
AAT1149B step-down converter: switching losses, con-
duction losses, and quiescent current losses. Conduction
losses are associated with the RDS(ON) characteristics of
the power output switching devices. Switching losses are
dominated by the gate charge of the power output
switching devices. At full load, assuming continuous con-
duction mode (CCM), a simplified form of the losses is
given by:
PTOTAL =
IO2 · (RDS(ON)H · VO + RDS(ON)L · [VIN - VO])
VIN
+ (tsw · FS · IO + IQ) · VIN
IQ is the step-down converter quiescent current. The
term tsw is used to estimate the full load step-down con-
verter switching losses.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201989B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 18, 2013
11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet AAT1149B.PDF ] | |
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