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What is AAT1149?

This electronic component, produced by the manufacturer "AAT", performs the same function as "Step-Down Converter".


AAT1149 Datasheet PDF - AAT

Part Number AAT1149
Description Step-Down Converter
Manufacturers AAT 
Logo AAT Logo 


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Total 20 Pages



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AAT1149
3MHz Fast Transient
400mA Step-Down Converter
General Description
Features
SwitchReg
The AAT1149 SwitchReg is a 3.0MHz step-down
converter with an input voltage range of 2.7V to
5.5V and output voltage as low as 1.0V. It is opti-
mized to react quickly to load variations and oper-
ate with a tiny 0603 inductor that is only 1mm tall.
The AAT1149 output voltage is programmable via
external feedback resistors. It can deliver 400mA of
load current while maintaining a low 45μA no load
quiescent current. The 3.0MHz switching frequen-
cy minimizes the size of external components while
keeping switching losses low.
The AAT1149 maintains high efficiency throughout
the operating range, which is critical for portable
applications.
The AAT1149 is available in a Pb-free, space-saving
2.0x2.1mm SC70JW-8 package and is rated over
the -40°C to +85°C temperature range.
• Ultra-Small 0603 Inductor (Height = 1mm)
• VIN Range: 2.7V to 5.5V
• VOUT Adjustable from 1.0V to VIN
• 400mA Max Output Current
• Up to 98% Efficiency
• 45μA No Load Quiescent Current
• 3.0MHz Switching Frequency
• 70μs Soft Start
• Fast Load Transient
• Over-Temperature Protection
• Current Limit Protection
• 100% Duty Cycle Low-Dropout Operation
• <1μA Shutdown Current
• SC70JW-8 Package
• Temperature Range: -40°C to +85°C
Applications
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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
AAT1149
IN LX
EN FB
AGND PGND
PGND PGND
VOUT = 1.8V
L1 1.8µH
R1
118k
R2
59k
C1
4.7µF
1149.2006.11.1.0
1

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AAT1149 equivalent
Typical Characteristics
Efficiency vs. Load Current
(VOUT = 3V; L = 3µH)
100
VIN = 3.3V
90
80
70 VIN = 4.2V VIN = 5V
60
50
0.1
1 10 100
Load Current (mA)
1000
Efficiency vs. Load Current
(VOUT = 1.8V; L = 2.2µH)
100
90 VIN = 3V
VIN = 3.6V
80
VIN = 2.7V
70 VIN = 5V
VIN = 4.2V
60
50
0.1
1 10 100
Load Current (mA)
1000
No Load Quiescent Current vs. Input Voltage
70
60 85°C
50
40
30 -40°C
20
10
0
2.5 3 3.5 4 4.5 5
Input Voltage (V)
25°C
5.5 6
AAT1149
3MHz Fast Transient
400mA Step-Down Converter
1.00
0.75
0.50
0.25
0.00
-0.25
-0.50
-0.75
-1.00
0.1
Load Regulation
(VOUT = 3V; L = 3µH)
VIN = 4.2V
VIN = 5V
VIN = 3.3V
1 10 100
Load Current (mA)
1000
Load Regulation
(VOUT = 1.8V; L = 2.2µH)
1.00
0.75
0.50
0.25
0.00
-0.25
-0.50
VIN = 5V
-0.75
-1.00
0.1
1
VIN = 3V
VIN = 4.2V
VIN = 3.6V
VIN = 2.7V
10 100 1000
Load Current (mA)
Switching Frequency vs. Input Voltage
2
1
VOUT = 1.1V
0
-1
-2
-3
VOUT = 1.8V
VOUT = 3V
-4
2.5 3 3.5 4 4.5 5
Input Voltage (V)
5.5
1149.2006.11.1.0
5


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Part Details

On this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for AAT1149 electronic component.


Information Total 20 Pages
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