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PDF AAT2789 Data sheet ( Hoja de datos )

Número de pieza AAT2789
Descripción High Frequency Dual Step-Down Converter
Fabricantes Advanced Analogic Technologies 
Logotipo Advanced Analogic Technologies Logotipo



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SystemPowerTM
PRODUCT DATASHEET
AAT2789
Low Noise, High Frequency Dual Step-Down Converter
General Description
The AAT2789 is a 2-channel synchronous step-down
converter operating from an input voltage range of 2.7V
to 5.5V, making it the ideal choice for single-cell Lithium-
ion/polymer battery powered systems or low voltage
3.3V and 5V based consumer equipment.
Channel 1 delivers up to 1700mA output current while
Channel 2 delivers up to 800mA. Both converters incor-
porate a unique low noise architecture which reduces
output ripple and spectral noise.
The AAT2789 uses a high switching frequency to mini-
mize external filter sizing. Peak current mode control
eliminates external compensation while optimizing tran-
sient performance and stability.
The AAT2789 requires a minimum of external compo-
nents to realize a high efficiency dual-output step-down
converter while minimizing solution size and footprint.
Each of the step-down regulators has an independent
input and enable pin. Externally adjustable output volt-
age is provided. Light load operating mode provides high
efficiency over the entire load range. Low quiescent cur-
rent enables excellent life for battery powered systems.
The AAT2789 is available in a 3x4mm Pb-free 16-pin
TDFN package and is rated over the -40°C to 85°C oper-
ating temperature range.
Features
VIN Range: 2.7V to 5.5V
Output Voltage Range: 0.6V to VIN
• Low Noise Light Load Mode
• Low Ripple PWM Mode
• Output Current:
Channel 1: 1700mA
Channel 2: 800mA
• Highly Efficient Step-Down Converters
Low RDS(ON) Integrated Power Switches
• 100% Duty Cycle
• High Switching Frequency
• Peak Current Mode Control
• Internal Compensation
• Excellent Transient Response
• Internal Soft Start
• Fast Turn-On Time
• Over-Temperature Protection
• Current Limit Protection
• Low Profile TDFN34-16 Package
• -40°C to 85°C Temperature Range
Applications
• Cellular and Smart Phones
• Digital Cameras
• Handheld Instruments
• Mass Storage Systems
• Microprocessor / DSP Core / IO Power
• PDAs and Handheld Computers
• Portable Media Players
• USB Devices
• Wireless Data Systems
Typical Application
VIN: 2.7V - 5.5V
C1
10μF
6.3V
AAT2789
TDFN34-16
VP1,2
LX1
VCC1,2
EN1 PGND1
EN2
FB1
AGND1
LX2
PGND2
FB2
AGND2
L1
1.5μH
L2
3.3μH
VOUT1
1.2V, 1700mA
C2
22μF
6.3V
VOUT2
3.3V, 800mA
C3
10μF
6.3V
R3
267k
R4
59.0k
R1
59.0k
R2
59.0k
2789.2008.03.1.0
www.analogictech.com
1

1 page




AAT2789 pdf
SystemPowerTM
PRODUCT DATASHEET
AAT2789
Low Noise, High Frequency Dual Step-Down Converter
Typical Characteristics – Channel 1
100
90
80
70
60
50
40
30
0.1
Efficiency vs. Output Current
(VOUT = 3.3V)
VIN = 3.6V
VIN = 4.2V
VIN = 5V
1
10
100
1000
10000
Output Current (mA)
Load Regulation vs. Output Current
(VOUT = 3.3V)
1.0
0.5
0.0
-0.5
-1.0
0.1
VIN = 3.6V
VIN = 4.2V
VIN = 5V
1
10
100
1000
10000
Output Current (mA)
100
90
80
70
60
50
40
30
0.1
Efficiency vs. Output Current
(VOUT = 1.8V)
VIN = 2.7V
VIN = 3.6V
VIN = 4.2V
1
10
100
1000
10000
Output Current (mA)
Load Regulation vs. Output Current
(VOUT = 1.8V)
1.0
0.5
0.0
-0.5
-1.0
0.1
VIN = 2.7V
VIN = 3.6V
VIN = 4.2V
1
10
100
1000
10000
Output Current (mA)
100
90
80
70
60
50
40
30
0.1
Efficiency vs. Output Current
(VOUT = 1.2V)
VIN = 2.7V
VIN = 3.6V
VIN = 4.2V
1
10
100
1000
10000
Output Current (mA)
Load Regulation vs. Output Current
(VOUT = 1.2V)
1.0
VIN = 2.7V
VIN = 3.6V
0.5 VIN = 4.2V
0.0
-0.5
-1.0
0.1
1 10 100 1000
Output Current (mA)
10000
2789.2008.03.1.0
www.analogictech.com
5

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AAT2789 arduino
SystemPowerTM
PRODUCT DATASHEET
AAT2789
Low Noise, High Frequency Dual Step-Down Converter
Typical Characteristics – Channel 2
N-Channel RDS(ON) vs. Input Voltage
550
120°C
500 100°C
450
85°C
25°C
400
350
300
250
200
2.5 3 3.5 4 4.5 5 5.5 6
Input Voltage (V)
Load Transient
(VIN = 3.6V; VOUT = 1.8V; COUT = 10µF; CFF = 100pF)
1.9
1.8
1.7
1.6 300mA
1mA
1.5
1.4
1.3 300mA
1.2
1mA
1.1
Time (50µs/div)
Load Transient
(VIN = 3.6V; VOUT = 1.8V; COUT = 4.7µF; CFF = 0pF)
1.85
1.8
1.75
1.7
1.65
400mA
300mA
1.6
1.55
1.5
400mA
300mA
Time (50µs/div)
Load Transient
(VIN = 3.6V; VOUT = 1.8V; COUT = 10µF; CFF = 0pF)
1.85
1.8
1.75
1.7
1.65
400mA
300mA
1.6
1.55
1.5
400mA
300mA
Time (50µs/div)
Load Transient
(VIN = 3.6V; VOUT = 1.8V; COUT = 10µF; CFF = 100pF)
1.85
1.8
1.75
1.7
1.65
400mA
300mA
1.6
1.55
400mA
300mA
1.5
Time (50µs/div)
Line Transient
(VOUT = 1.8V; VIN = 3.6V to 4.2V; IOUT = 400mA; CFF = 0pF)
4.8 1.92
4.2 1.9
3.6 1.88
3 1.86
2.4 1.84
1.8 1.82
1.2 1.8
0.6 1.78
0 1.76
Time (50µs/div)
2789.2008.03.1.0
www.analogictech.com
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