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PDF AAT2113B Data sheet ( Hoja de datos )
| Número de pieza | AAT2113B | |
| Descripción | Fast Transient 1.5A Step-Down Converter | |
| Fabricantes | Skyworks | |
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DATA SHEET
AAT2113B
3.3MHz, Fast Transient 1.5A Step-Down Converter in an 2mm x 2mm Package
General Description
The AAT2113B 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
3.3MHz switching frequency enables the use of small
external components. The ultra-small 2mm x 2mm foot-
print and high efficiency make the AAT2113B an ideal
choice for portable applications.
The AAT2113B 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 AAT2113B the ideal choice for high
output voltage, high current applications which require a
low dropout threshold.
The AAT2113B provides excellent transient response and
output accuracy across the operating range. No external
compensation is required.
The AAT2113B maintains high efficiency throughout the
load range. The unique low-noise architecture reduces
ripple and spectral noise. The AAT2113B 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 AAT2113B and system components from damage.
The AAT2113B 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 2.5V
• High Efficiency, Low Noise Architecture
• 3.3MHz 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
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
AAT2113B
VCC
FB
AGND
PGND
FTDFN 22-8
L1
0.47µH
VOUT
1.2V/1.5A
C3
10µF
6.3V
0603
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202003A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 24, 2012
1
1 page  
DATA SHEET
AAT2113B
3.3MHz, Fast Transient 1.5A Step-Down Converter in an 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)
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
Output Current (mA)
10000
100
90
80
70
60
50
40
30
20
10
0
.
0.1
Efficiency vs. Output Current
(VOUT = 1.8V; L = 0.82µH)
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 = 0.82µH)
VIN = 5.5V
VIN = 5.0V
VIN = 4.2V
VIN = 3.6V
VIN = 3.0V
VIN = 2.7V
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 = 2.5V; L = 1µH)
VIN = 5.5V
VIN = 5.0V
VIN = 4.2V
VIN = 3.6V
VIN = 3.0V
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 = 2.5V; L = 1µH)
VIN = 5.5V
VIN = 5.0V
VIN = 4.2V
VIN = 3.6V
VIN = 3.0V
1 10 100 1000
Output Current (mA)
10000
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202003A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 24, 2012
5
5 Page 
DATA SHEET
AAT2113B
3.3MHz, Fast Transient 1.5A Step-Down Converter in an 2mm x 2mm Package
Functional Block Diagram
FB
VCC
VP
AAT2113B-1.2V Only
VREF =
0.6V
Err
Amp
Comp
EN Input
DH
Logic
DL
LX
PGND
AGND
Functional Description
The AAT2113B SwitchReg is a 1.5A step-down converter
with a typical input voltage of 3.3V and a fixed output
voltage of 1.2V. The 3.3MHz switching frequency enables
the use of small external components. The ultra-small,
2mm x 2mm footprint and high efficiency make the
AAT2113B an ideal choice for portable applications.
Typically, a 0.47μH inductor and a 10μF ceramic capaci-
tor are recommended for a 1.2V output (see Figure 2 for
recommended values).
At dropout, the converter duty cycle increases to 100%
and the output voltage tracks the input voltage minus
the RDS(ON) drop of the P-channel high-side MOSFET (plus
the DC drop of the external inductor). The device inte-
grates extremely low RDS(ON) MOSFETs to achieve low
dropout voltage during 100% duty cycle operation.
The integrated low-loss MOSFET switches can provide
excellent efficiency at heavy loads. Light load operation
maintains high efficiency, low ripple and low spectral
noise even at lower currents (typically <150mA). PWM
mode operation maintains constant frequency and low
output ripple at output loads greater than 200mA.
In battery-powered applications, as VIN decreases, the
converter dynamically adjusts the operating frequency
prior to dropout to maintain the required duty cycle and
provide accurate output regulation. Output regulation is
maintained until the dropout voltage, or minimum input
voltage, is reached. At 1.5A output load, dropout voltage
headroom is approximately 200mV.
The AAT2113B typically achieves better than ±0.5%
output regulation across the input voltage and output
load range. A current limit of 3.0A (typical) protects the
IC and system components from short-circuit damage.
Typical no load quiescent current is 55μA.
Thermal protection completely disables switching when
the maximum junction temperature is detected. The
junction over-temperature threshold is 140°C with 25°C
of hysteresis. Once an over-temperature or over-current
fault condition is removed, the output voltage automati-
cally recovers.
Peak current mode control and optimized internal com-
pensation provide high loop bandwidth and excellent
response to input voltage and fast load transient events.
Soft start eliminates output voltage overshoot when the
enable or the input voltage is applied. Under-voltage
lockout prevents spurious start-up events.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202003A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 24, 2012
11
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet AAT2113B.PDF ] | |
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