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PDF AAT2113A Data sheet ( Hoja de datos )

Número de pieza AAT2113A
Descripción Fast Transient 1.5A Step-Down Converter
Fabricantes Advanced Analogic Technologies 
Logotipo Advanced Analogic Technologies Logotipo



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PRODUCT DATASHEET
AAT2113A
SwitchRegTM 3MHz, Fast Transient 1.5A Step-Down Converter in 2mm x 2mm Package
General Description
The AAT2113A SwitchReg™ is a 1.5A step-down con-
verter with a typical input voltage of 3.3V and a fixed
output voltage of 1.2V or an adjustable output. The
3MHz switching frequency enables the use of small
external components. The ultra-small 2mm x 2mm foot-
print and high efficiency make the AAT2113A an ideal
choice for portable applications.
The AAT2113A delivers 1.5A maximum output current
while consuming only 55μA no-load quiescent current.
Low RDS(ON) integrated MOSFETs and 100% duty cycle
operation make the AAT2113A the ideal choice for high
output voltage, high current applications which require a
low dropout threshold.
The AAT2113A provides excellent transient response and
output accuracy across the operating range. No external
compensation is required.
The AAT2113A maintains high efficiency throughout the
load range. The unique low-noise architecture reduces
ripple and spectral noise. The AAT2113A automatically
optimizes efficiency during Light Load mode (LL) and
maintains constant frequency and low output ripple dur-
ing PWM mode.
Over-temperature and short circuit protection safeguard
the AAT2113A and system components from damage.
The AAT2113A is available in a Pb-free, ultra-small, low
profile, 8-pin 2mm x 2mm FTDFN package. The product
is rated over a temperature range of -40°C to 85°C.
Features
• 5mm x 5mm Total Solution Size
• 1.5A Maximum Output Current
• Tiny 0.47μH Chip Inductor
• Excellent Transient Response
• Input Voltage: 2.7V to 5.5V
• Ultra-small, Low Profile 8-pin 2mm x 2mm FTDFN
Package
• Fixed or Adjustable Output Voltage Options:
Fixed Output Voltage: 1.2V
Adjustable Output Voltage: 1.0V to 1.8V
• High Efficiency, Low Noise Architecture
• 3MHz Switching Frequency
• No External Compensation Required
• 55μA No Load Quiescent Current
• 100% Duty Cycle Low-Dropout Operation
• Internal Soft Start
• Over-Temperature and Current Limit Protection
• <1μA Shutdown Current
• -40°C to 85°C Temperature Range
Applications
• Cellular Phones
• Digital Cameras
• Hard Disk Drives
• MP3 Players
• PDAs and Handheld Computers
• Portable Media Players
• USB Devices
• Wireless Network Cards
Typical Application
Load Transient Response
(VIN = 5V; VOUT = 1.2V; IOUT = 10% to 100%;
COUT = 10µF, 6.3V, 0603)
1.3V
1.25V
1.2V
100mV
1.15V
1.1V
www.DataSheet4U.com
1.5A
150mA
VIN
2.7V to 5.5V
C1
4.7µF
6.3V
0603
C3
1.0µF
6.3V
0402
Time (20µs/div)
U1
VP LX
EN LX
AAT2113A
VCC
FB
AGND
PGND
FTDFN 22-8
L1
0.47µH
VOUT
1.2V/1.5A
C3
10µF
6.3V
0603
2113A.2009.06.1.1
www.analogictech.com
1

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AAT2113A pdf
PRODUCT DATASHEET
AAT2113A
SwitchRegTM 3MHz, Fast Transient 1.5A Step-Down Converter in 2mm x 2mm Package
Typical Characteristics
100
90
80
70
60
50
40
30
20
10
0
0.1
Efficiency vs. Output Current
(VOUT = 1.2V; L = 0.47µH)
VIN = 5.5V
VIN = 5.0V
VIN = 4.2V
VIN = 3.6V
VIN = 3.0V
VIN = 2.7V
1
10
100
1000
10000
Output Current (mA)
100
90
80
70
60
50
40
30
20
10
0
0.1
Efficiency vs. Output Current
(VOUT = 1.8V; L = 0.47µH)
VIN = 5.5V
VIN = 5.0V
VIN = 4.2V
VIN = 3.6V
VIN = 3.0V
VIN = 2.7V
1
10
100
1000
10000
Output Current (mA)
1.0
0.8
0.6
0.4
0.2
0.0
-0.2
-0.4
-0.6
-0.8
-1.0
0.1
Load Regulation
(VOUT = 1.2V; L = 0.47µH)
VIN = 5.5V
VIN = 5.0V
VIN = 4.2V
VIN = 3.6V
VIN = 3.0V
VIN = 2.7V
1
10
100
1000
10000
Output Current (mA)
1.0
0.8
0.6
0.4
0.2
0.0
-0.2
-0.4
-0.6
-0.8
-1.0
0.1
Load Regulation
(VOUT = 1.8V; L = 0.47µH)
VIN = 5.5V
VIN = 5.0V
VIN = 4.2V
VIN = 3.6V
VIN = 3.0V
VIN = 2.7V
1
10
100
1000
10000
Output Current (mA)
Line Regulation
(VOUT = 1.2V; L = 0.47µF)
1.0
0.8 IOUT = 1500mA
0.6 IOUT = 1000mA
0.4
IOUT = 500mA
IOUT = 1mA
0.2
0.0
-0.2
-0.4
www-.0D.6ataSheet4U.com
-0.8
-1.0
2.7
3.1
3.5
3.9 4.3 4.7 5.1 5.5
Input Voltage (V)
1.0
0.8
0.6
0.4
0.2
0.0
-0.2
-0.4
-0.6
-0.8
-1.0
2.7
Line Regulation
(VOUT = 1.8V; L = 0.47µF)
IOUT = 1500mA
IOUT = 1000mA
IOUT = 500mA
IOUT = 1mA
3.1 3.5
3.9 4.3 4.7 5.1 5.5
Input Voltage (V)
2113A.2009.06.1.1
www.analogictech.com
5

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AAT2113A arduino
PRODUCT DATASHEET
AAT2113A
SwitchRegTM 3MHz, Fast Transient 1.5A Step-Down Converter in 2mm x 2mm Package
Input Capacitor
Select a 4.7μF to 10μF X7R or X5R ceramic capacitor for
the input. To estimate the required input capacitor size,
determine the acceptable input ripple level (VPP) and
solve for C. The calculated value varies with input volt-
age and is a maximum when VIN is double the output
voltage.
CIN =
VO
VIN
·
⎛⎝1 -
VO
VIN
VPP
IO
- ESR⎞⎠ · FS
VO
VIN
·
⎛⎝1 -
VO
VIN
=
1
4
for
VIN
=
2
·
VO
CIN(MIN) = VPP
IO
1
- ESR⎞⎠ · 4 · FS
Always examine the ceramic capacitor DC voltage coef-
ficient characteristics when selecting the proper value.
For example, the capacitance of a 10μF, 6.3V, X5R
ceramic capacitor with 3.5V DC applied is actually about
5μF. Some examples of DC bias voltage versus capaci-
tance for different package sizes are shown in Figure 1.
12
0603 Package
10 0805 Package
8
6
4
2
0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5
DC Bias Voltage (V)
Figure 1: 10μF Capacitor Value vs. DC Bias
Voltage for Different Package Sizes.
The maximum input capacitor RMS current is:
www.DataSheet4U.com
IRMS = IO ·
VO · 1 - VO
VIN VIN
The input capacitor RMS ripple current varies with the
input and output voltage and will always be less than or
equal to half of the total DC load current.
VO · 1 - VO = D · (1 - D) = 0.52 = 1
VIN VIN
2
for VIN = 2 · VO
I =RMS(MAX)
IO
2
The term
VO
VIN
·
⎛⎝1 -
VO
VIN
appears in both the input voltage
ripple and input capacitor RMS current equations and is
a maximum when VO is twice VIN. This is why the input
voltage ripple and the input capacitor RMS current ripple
are a maximum at 50% duty cycle. The input capacitor
provides a low impedance loop for the edges of pulsed
current drawn by the AAT2113A. Low ESR/ESL X7R and
X5R ceramic capacitors are ideal for this function. To
minimize stray inductance, the capacitor should be
placed as closely as possible to the IC. This keeps the
high frequency content of the input current localized,
minimizing EMI and input voltage ripple. The proper
placement of the input capacitor (C1) can be seen in the
evaluation board layout in the Layout section of this
datasheet (see Figure 3).
A laboratory test set-up typically consists of two long
wires running from the bench power supply to the eval-
uation board input voltage pins. The inductance of these
wires, along with the low-ESR ceramic input capacitor,
can create a high Q network that may affect converter
performance. This problem often becomes apparent in
the form of excessive ringing in the output voltage dur-
ing load transients. Errors in the loop phase and gain
measurements can also result.
Since the inductance of a short PCB trace feeding the
input voltage is significantly lower than the power leads
from the bench power supply, most applications do not
exhibit this problem.
In applications where the input power source lead induc-
tance cannot be reduced to a level that does not affect
the converter performance, a high ESR tantalum or alu-
minum electrolytic should be placed in parallel with the
low ESR/ESL bypass ceramic capacitor. This dampens
the high Q network and stabilizes the system.
2113A.2009.06.1.1
www.analogictech.com
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