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PDF AAT1149A Data sheet ( Hoja de datos )
| Número de pieza | AAT1149A | |
| Descripción | 2.2MHz Fast Transient 400mA Step-Down Converter | |
| Fabricantes | AAT | |
| Logotipo |  |
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SwitchRegTM
PRODUCT DATASHEET
AAT1149A
2.2MHz Fast Transient 400mA Step-Down Converter
General Description
The AAT1149A 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 AAT1149A can deliver 400mA of load current and
operates in PWM only mode for low noise operation. The
2.2MHz switching frequency minimizes the size of exter-
nal components while keeping switching losses low.
The AAT1149A is optimized for low noise portable
applications.
The AAT1149A 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 1.875V
• 400mA Max Output Current
• Up to 98% Efficiency
• 3mA 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
• 0.9x1.2mm 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
AAT1149A
IN LX
EN FB
AGND PGND
PGND PGND
VOUT = 1.875V
L1 2.2µH
C1
4.7µF
1149A.2008.08.1.1
www.analogictech.com
1
1 page  
SwitchRegTM
PRODUCT DATASHEET
AAT1149A
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 = 1.875V)
VIN = 5V
VIN = 4.2V
VIN = 3.6V
VIN = 3V
VIN = 2.7V
1 10 100 1000
Output Current (A)
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
-0.2
0.1
Load Regulation
(VOUT = 1.875V)
VIN = 5V
VIN = 4.2V
VIN = 3.6V
VIN = 3V
VIN = 2.2V
1 10 100
Output Current (A)
1000
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 = 1.875V)
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 = 1.875V; IOUT = 400mA)
2.0
1.0
0.0
-1.0
-2.0
-40
-20
0 20 40 60
Temperature (°C)
80 100
1149A.2008.08.1.1
www.analogictech.com
5
5 Page 
SwitchRegTM
PRODUCT DATASHEET
AAT1149A
2.2MHz Fast Transient 400mA Step-Down Converter
Figure 1: AAT1149AIUV Evaluation Board
Top Side.
Figure 2: AAT1149AIUV Evaluation Board
Bottom Side.
VIN U1 L1
45
IN LX
EN
3
AAT1149AIUV
C3
open
22
1
EN
1
FB
C2
4.7μF
GND
3
R1
0
R2
open
VOUT
C1
4.7μF
WLCSP-5
Figure 3: AAT1149AIUV Evaluation Board Schematic.
Thermal Calculations
There are three types of losses associated with the
AAT1149A 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 switch-
ing devices. At full load, assuming continuous conduction
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.
1149A.2008.08.1.1
www.analogictech.com
11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet AAT1149A.PDF ] | |
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