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PDF AAT1151 Data sheet ( Hoja de datos )
| Número de pieza | AAT1151 | |
| Descripción | DC/DC Converter | |
| Fabricantes | AAT | |
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AAT1151
850kHz 700mA Synchronous Buck DC/DC Converter
General Description
The AAT1151 SwitchReg™ is a member of
AnalogicTech's Total Power Management IC™
(TPMIC™) product family. The step-down switching
converter is ideal for applications where high effi-
ciency is required over the full range of output load
conditions. The 2.7V to 5.5V input voltage range
makes the AAT1151 ideal for single-cell lithium-
ion/polymer battery applications. Capable of more
than 700mA with internal MOSFETs, the current-
mode controlled IC provides high efficiency using
synchronous rectification. Fully integrated compen-
sation simplifies system design and lowers external
parts count.
The device operates at a fixed 850kHz switching fre-
quency and enters PFM mode for light load current
to maintain high efficiency across all load conditions.
The AAT1151 is available in MSOP-8 and QFN33-16
packages and is rated over the -40°C to +85°C tem-
perature range.
Features
SwitchReg™
• VIN Range: 2.7V to 5.5V
• Up to 95% Efficiency
• High Initial Accuracy ±1%
• 110mΩ RDS(ON) Internal Switches
• <1µA Shutdown Current
• 850kHz Switching Frequency
• Fixed VOUT or Adjustable VOUT ≥1.0V
• Integrated Power Switches
• Synchronous Rectification
• Current Mode Operation
• Internal Compensation
• Stable with Ceramic Capacitors
• PWM and PFM for Optimum Efficiency for All
Load Conditions
• Internal Soft Start
• Over-Temperature Protection
• Current Limit Protection
• MSOP-8 and QFN33-16 Packages
• -40°C to +85°C Temperature Range
Typical Application
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Applications
• Cellular Phones
• Digital Cameras
• MP3 Players
• Notebook Computers
• PDAs
• USB-Powered Equipment
• Wireless Notebook Adapters
INPUT
10µF
100Ω
0.1µF
VP
AAT1151
FB
ENABLE
LX
VCC
SGND
PGND
3.0µH
2x 22µF
OUTPUT
1151.2005.11.1.4
1
1 page  
AAT1151
850kHz 700mA Synchronous Buck DC/DC Converter
Typical Characteristics
No Load Supply Current vs. Input Voltage
300
250 T = 85°C
200
150 T = -40°C
100
T = 25°C
50
0
2.5 3 3.5 4 4.5 5 5.5
Input Voltage (V)
890
880
870
860
850
2.5
Frequency vs. Input Voltage
3 3.5 4 4.5 5
Input Voltage (V)
5.5
Output Voltage vs. Temperature
1.794
1.792
1.79
1.788
1.786
1.784
1.782
1.78
-40
-20
0 20 40 60
Temperature (°C)
80 100
3.0
2.0
1.0
0.0
-1.0
-2.0
-3.0
1
Load and Line Regulation
VIN = 4.2V
VIN = 3.6V
VIN = 2.7V
10 100
Load Current (mA)
1000
Switching Frequency vs. Temperature
1200
1000
800
600
400
200
0
-40 -20 0 20 40 60 80 100
Temperature (°C)
100
95
90
85
80
75
70
65
60
55
50
1
AAT1151 Efficiency
(VOUT = 2.5V; L = 4.2µH)
10 100 1000
Output Current (mA)
10000
1151.2005.11.1.4
5
5 Page 
AAT1151
850kHz 700mA Synchronous Buck DC/DC Converter
Figure 2: MSOP Evaluation
Board Top Layer.
Figure 3: MSOP Evaluation
Board Bottom Layer.
Figure 4: QFN Evaluation Board
Top Side.
Figure 5: QFN Evaluation Board
Bottom Side.
45
R4=10kΩ
40
35
30
25
20
15
10
5
0
1 1.5 2 2.5 3 3.5 4 4.5 5 5.5
Output Voltage (V)
2.7V-5.5V
C1
10µF
R1 100
R2
100k
C3
0.1 µF
5
4
3
2
AAT1151-1.0
Vp FB
Vcc LX
EN LX
gnd Pgnd
1
7
6
8
Vo+ 1.25V 0.7A
R3
2.55k 1%
L1
3.3µH
R4
10kΩ 1%
C2, C4
2x 22µF
V-
C1 Murata 10µF 6.3V X5R GRM42-6X5R106K6.3
C2, C4 MuRata 22µF 6.3V GRM21BR60J226ME39L X5R 0805
L1 Sumida CDRH3D16-3R3 NC
Figure 6: R3 vs. VOUT for Adjustable Output
Using the AAT1151-1.0V.
Figure 7: Adjustable Output Schematic.
1151.2005.11.1.4
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet AAT1151.PDF ] | |
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