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What is AAT1145?

This electronic component, produced by the manufacturer "Advanced Analogic Technologies", performs the same function as "1.2A Step-Down Converter".


AAT1145 Datasheet PDF - Advanced Analogic Technologies

Part Number AAT1145
Description 1.2A Step-Down Converter
Manufacturers Advanced Analogic Technologies 
Logo Advanced Analogic Technologies Logo 


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SwitchRegTM
General Description
The AAT1145 SwitchReg™ is a 1.5MHz constant fre-
quency current mode PWM step-down converter. It is
ideal for portable equipment requiring very high current
up to 1.2A from single-cell Lithium-ion batteries while
still achieving over 90% efficiency during peak load con-
ditions. The AAT1145 also can run at 100% duty cycle
for low dropout operation, extending battery life in por-
table systems while light load operation provides very
www.DatalSohweeot4uUt.pcoumt ripple for noise sensitive applications.
The AAT1145 can supply up to 1.2A 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 AAT1145 is available in adjustable (0.6V to VIN) and
fixed (1.8V) output voltage versions. The device is avail-
able in a Pb-free, 3x3mm 10-lead TDFN package and is
rated over the -40°C to +85°C temperature range.
PRODUCT DATASHEET
AAT1145
1.2A Step-Down Converter
Features
• Input Voltage Range: 2.5V to 5.5V
• Output Voltages from 0.6V to VIN
• 1.2A Output Current
• High Efficiency: Up to 95%
• 1.5MHz 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
10μF
1 EN
2 IN
LX 8
LX 7
3 AIN AAT1145-1.8 OUT 5
6 AGND
4 AGND
PGND 10
PGND 9
L1
2.2μH
VOUT
1.8V,1.2A
C2
22μF
1145.2007.11.1.1
www.analogictech.com
1

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AAT1145 equivalent
SwitchRegTM
Typical Characteristics
Efficiency vs. Output Current
(VOUT = 3.3V; TA = 25°C; L = 2.2µH)
100
90
80
70
60
50
www.DataSheet440U.com
30
20
10
0
0.1
VIN = 4.2V
VIN = 3.6V
1 10
VIN = 5.0V
100 1000
Output Current (mA)
10000
100
90
80
70
60
50
40
30
20
10
0
0.1
Efficiency vs. Output Current
(VOUT = 1.5V; TA = 25°C; L = 2.2µH)
VIN = 2.5V
VIN = 3.6V
VIN = 5.0V
VIN = 4.2V
1 10 100 1000
Output Current (mA)
10000
Output Voltage vs. Output Current
(VOUT = 3.3V; TA = 25°C; L = 2.2µH)
3.400
3.380
3.360
3.340
3.320
3.300
3.280
3.260
3.240
3.220
3.200
0
VIN = 3.6V
VIN = 5.0V
VIN = 4.2V
200 400 600 800 1000
1200
Output Current (mA)
PRODUCT DATASHEET
AAT1145
1.2A Step-Down Converter
Efficiency vs. Output Current
(VOUT = 1.8V; TA = 25°C; L = 2.2µH)
100
90
80
70
60
50
40
30
20
10
0
0.1
VIN = 3.6V
VIN = 2.5V
VIN = 5.0V
VIN = 4.2V
1 10 100
1000
Output Current (mA)
10000
100
90
80
70
60
50
40
30
20
10
0
0.1
Efficiency vs. Output Current
(VOUT = 1.2V; TA = 25°C; L = 2.2µH)
VIN = 2.5V
VIN = 3.6V
VIN = 5.0V
VIN = 4.2V
1 10 100 1000
Output Current (mA)
10000
Output Voltage vs. Output Current
(VOUT = 1.8V; TA = 25°C; L = 2.2µH)
1.820
1.815
1.810
1.805
1.800
VIN = 5.0V
VIN = 4.2V
1.795
1.790
VIN = 2.5V VIN = 3.6V
1.785
1.780
0
200
400
600
800
1000
1200
Output Current (mA)
1145.2007.11.1.1
www.analogictech.com
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 AAT1145 electronic component.


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