Data Sheets - Skyworks Solutions, Inc.

DATA SHEET
AAT2789
Low Noise, High Frequency Dual Step-Down Converter
General Description
Features
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 Lithiumion/polymer battery powered systems or low voltage
3.3V and 5V based consumer equipment.
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Channel 1 delivers up to 1700mA output current while
Channel 2 delivers up to 800mA. Both converters incorporate a unique low noise architecture which reduces
output ripple and spectral noise.
The AAT2789 uses a high switching frequency to minimize external filter sizing. Peak current mode control
eliminates external compensation while optimizing transient performance and stability.
The AAT2789 requires a minimum of external components 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 voltage is provided. Light load operating mode provides high
efficiency over the entire load range. Low quiescent current 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 operating temperature range.
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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
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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
LX1
VP1,2
VCC1,2
EN1
PGND1
EN2
FB1
AGND1
PGND2
FB2
AGND2
R1
59.0k
R2
59.0k
C2
22μF
6.3V
L2
3.3μH
LX2
VOUT1
1.2V, 1700mA
L1
1.5μH
VOUT2
3.3V, 800mA
C3
10μF
6.3V
R3
267k
R4
59.0k
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202047A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 11, 2012
1
DATA SHEET
AAT2789
Low Noise, High Frequency Dual Step-Down Converter
Pin Descriptions
Pin #
Symbol
1
N/C
2
PGND2
3
LX2
4
VP2
5
6
VCC1
EN1
7,8
VP1
9
LX1
10
PGND1
11
FB1
12
13
14
AGND1
VCC2
EN2
15
FB2
16
AGND2
EP
EP
Function
No connect.
Power ground pin for Channel 2 step-down converter. Connect return of Channel 2 input and output
capacitors close to this pin for best noise performance.
Channel 2 step-down converter switching pin. Connect output inductor to this pin. Inductor value is
determined by output voltage.
Input supply voltage pin for Channel 2 step-down converter. Connect a 10μF ceramic input capacitor
close to this pin or connect to VP1. Operating input voltage range is 2.7V to 5.5V.
Input supply pin for Channel 1. Must be closely decoupled.
Enable Channel 1 input pin. Active high.
Input supply voltage pin for Channel 1 step-down converter. Connect a 10μF ceramic input capacitor
close to this pin. Operating input voltage range is 2.7V to 5.5V.
Channel 1 step-down converter switching pin. Connect output inductor to this pin. Inductor value is
determined by output voltage.
Power ground pin for Channel 1 step-down converter. Connect return of Channel 1 input and output
capacitors close to this pin for best noise performance.
Feedback pin for Channel 1. Connect an external resistor divider to this pin to program the output voltage to the desired value.
Signal ground for Channel 1.
Input supply pin for Channel 2. Must be closely decoupled.
Enable Channel 2 input pin. Active high.
Feedback pin for Channel 2. Connect an external resistor divider to this pin to program the output voltage to the desired value.
Signal Ground for Channel 2.
Exposed paddle. Connect to PGND1 and PGND2 as close as possible to the device. Use properly sized
vias for thermal coupling to the ground plane. See PCB layout guidelines.
Pin Configuration
TDFN34-16
(Top View)
N/C
PGND2
LX2
VP2
VCC1
EN1
VP1
VP1
2
1
16
2
15
3
14
4
13
5
12
6
11
7
10
8
9
AGND2
FB2
EN2
VCC2
AGND1
FB1
PGND1
LX1
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202047A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 11, 2012
DATA SHEET
AAT2789
Low Noise, High Frequency Dual Step-Down Converter
Absolute Maximum Ratings1
Symbol
VIN
VLX
VFB
VEN
TJ
TLEAD
Description
VP1, VP2, VCC1, VCC2 voltages to PGND, AGND
VLX1, VLX2 to PGND, AGND
VFB1, VFB2 to PGND, AGND
VEN1, VEN2 to PGND, AGND
Operating Junction Temperature Range
Maximum Soldering Temperature (at leads, 10 sec)
Value
Units
6.0
-0.3 to VIN + 0.3
-0.3 to VIN + 0.3
-0.3 to 6.0
-40 to 150
300
V
V
V
V
C
C
Value
Units
2.0
50
W
C/W
Thermal Information
Symbol
PD
JA
Description
Maximum Power Dissipation
Thermal Resistance3
2
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions
specified is not implied. Only one Absolute Maximum Rating should be applied at any one time.
2. Mounted on a FR4 board.
3. Derate 20mW/°C above 25°C ambient temperature.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202047A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 11, 2012
3
DATA SHEET
AAT2789
Low Noise, High Frequency Dual Step-Down Converter
Electrical Characteristics1
VIN = 3.6V, TA = -40°C to 85°C, unless noted otherwise. Typical values are at TA = 25°C.
Symbol
Description
Conditions
Max
Units
5.5
2.4
IOUT1 = 0A to 1.7A
120
85
0.5
V
V
mV
V
V
%
μA
μA
mA
mΩ
mΩ
%
VP1 = 2.7V to 5.5V
0.2
%/V
Channel 1: 1700mA Step-Down Converter
VP1, VCC1
Input Voltage
VUVLO1
UVLO Threshold
Output Voltage Range
VOUT1
VOUT1(TOL)
Output Voltage Tolerance
IQ1
Quiescent Current
ISHDN1
Shutdown Current
ILIM1
Current Limit
RDSON(H)1
High Side On-Resistance
RDSON(L)1
Low Side On-Resistance
ΔVLOADREG1
Load Regulation
ΔVLINEREG1 /
Line Regulation
ΔVP1
FOSC1
Oscillator Frequency
TS1
Start-Up Time
Channel 2: 800mA Step-Down Converter
Input Voltage
VP2, VCC2
VUVLO2
UVLO Threshold
VOUT2
Output Voltage Range
VOUT2(TOL)
Output Voltage Tolerance
IQ2
Quiescent Current
ISHDN2
Shutdown Current
ILIM2
Current Limit
RDSON(H)2
High Side On-Resistance
Low Side On-Resistance
RDSON(L)2
ΔVLOADREG2
Load Regulation
ΔVLINEREG2 /
Line Regulation
ΔVP2
FOSC2
Oscillator Frequency
TS2
Start-Up Time
Over-Temperature, EN Logic
Over-Temperature Shutdown Threshold
TSD1,2
Over-Temperature Shutdown Hysteresis
VEN1,2(L)
Enable Threshold Low
VEN1,2(H)
Enable Threshold High
Input Low Current
IEN(1,2
Min
Typ
2.7
VP1 Rising
VP1 Hysteresis
VP1 Falling
IOUT1 = 0A to 1.7A; VP1 = 2.7V to 5.5V
No load, VEN1 = VP1, VEN2 = AGND
VEN1 = GND
250
1.7
0.6
-3.0
42
VP1
3.0
90
1.0
1800
1.12
1.68
MHz
μs
5.5
2.7
IOUT2= 0mA to 800mA
330
275
0.5
V
V
mV
V
V
%
μA
μA
mA
mΩ
mΩ
%
VP2 = 2.7V to 5.5V
0.1
%/V
From Enable-1 to Output-1 Regulation
1.40
150
2.7
VP2 Rising
VP2 Hysteresis
VP2 Falling
IOUT2 = 0A to 800mA, VP2 = 2.7V to 5.5V
No load, VEN2 = VP2, VEN1 = AGND
VEN2 = GND
100
1.7
0.6
-3.0
37
VP2
3.0
70
1.0
900
0.9
From Enable-2 to Output-2 Regulation
2.0
150
2.6
140
15
0.6
1.4
-1.0
1.0
MHz
μs
°C
°C
V
V
μA
1. The AAT2789 is guaranteed to meet performance specifications over the –40°C to +85°C operating temperature range, and is assured by design, characterization and correlation with statistical process controls.
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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202047A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 11, 2012
DATA SHEET
AAT2789
Low Noise, High Frequency Dual Step-Down Converter
Typical Characteristics – Channel 1
Load Regulation vs. Output Current
Efficiency vs. Output Current
(VOUT = 3.3V)
(VOUT = 3.3V)
100
Efficiency (%)
90
80
70
60
50
VIN = 3.6V
VIN = 4.2V
VIN = 5V
40
30
0.1
1
10
100
1000
Load Regulation (%)
1.0
0.5
0.0
-0.5
-1.0
0.1
10000
VIN = 3.6V
VIN = 4.2V
VIN = 5V
1
Load Regulation vs. Output Current
(VOUT = 1.8V)
(VOUT = 1.8V)
80
70
60
50
VIN = 2.7V
VIN = 3.6V
VIN = 4.2V
40
1
10
100
1000
Load Regulation (%)
Efficiency (%)
10000
1.0
90
0.5
0.0
-0.5
-1.0
0.1
10000
VIN = 2.7V
VIN = 3.6V
VIN = 4.2V
1
10
100
1000
Efficiency vs. Output Current
Load Regulation vs. Output Current
(VOUT = 1.2V)
(VOUT = 1.2V)
100
80
70
60
VIN = 2.7V
VIN = 3.6V
VIN = 4.2V
40
1
10
100
Output Current (mA)
1000
10000
Load Regulation (%)
1.0
90
50
10000
Output Current (mA)
Output Current (mA)
Efficiency (%)
1000
Efficiency vs. Output Current
100
30
0.1
100
Output Current (mA)
Output Current (mA)
30
0.1
10
VIN = 2.7V
VIN = 3.6V
VIN = 4.2V
0.5
0.0
-0.5
-1.0
0.1
1
10
100
1000
10000
Output Current (mA)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202047A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 11, 2012
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DATA SHEET
AAT2789
Low Noise, High Frequency Dual Step-Down Converter
Typical Characteristics – Channel 1
Quiescent Current vs. Input Voltage
Output Voltage Error vs. Temperature
(VOUT = 1.8V; No Load)
(VOUT = 1.8V; IOUT = 1A)
1.5
70
Output Voltage Error (%)
Quiescent Current (µA)
80
85°C
60
50
25°C
40
30
-40°C
20
10
0
2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
-2.0
-2.5
-3.0
-3.5
-40 -30 -20 -10
0
10
Input Voltage (V)
1.79
25°C
-40°C
1.76
1.75
1.74
1.73
2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5
Switching Frequency (MHz)
Output Voltage (V)
1.80
1.77
80
90
1.54
1.52
1.5
1.48
1.46
1.44
1.42
-40 -30 -20 -10
0
10
20
30
40
50
60
Load Transient Response
(VOUT = 1.8V)
(VOUT = 1.8V; CFF = 100pF)
70
80
90
2.4
0.10
2.2
0.00
2.0
-0.10
1.8
-0.20
1.6
-0.30
1.4
-0.40
1.2
-0.50
1.0
-0.60
0.8
0.20
2.4
0.10
2.2
0.00
2.0
-0.10
1.8
-0.20
1.6
-0.30
1.4
-0.40
1.2
-0.50
1.0
-0.60
0.8
Time (100µs/div)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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Output Current
(bottom) (A)
0.20
Output Voltage (AC coupled)
(top)(mV)
Load Transient Response
Time (100µs/div)
70
Temperature (°C)
Output Current
(bottom) (A)
Output Voltage (AC coupled)
(top)(mV)
60
1.56
Input Voltage (V)
6
50
(VOUT = 1.8V; IOUT = 1A)
85°C
1.78
40
Switching Frequency vs. Temperature
(VOUT = 1.8V; IOUT = 1A)
1.81
30
Temperature (°C)
Output Voltage vs. Input Voltage
1.82
20
DATA SHEET
AAT2789
Low Noise, High Frequency Dual Step-Down Converter
Typical Characteristics – Channel 1
Line Transient Response
Line Regulation
(VOUT = 1.8V; IOUT = 1.5A; CFF = 100pF)
(VOUT = 1.8V; IOUT = 1A)
4.0
3.5
0.04
3.0
0.02
0.00
-0.02
-0.04
0.40
0.30
VOUT Error (%)
Input Voltage
(top) (V)
4.5
Output Voltage (AC coupled)
(bottom) (V)
5.0
0.20
0.10
0.00
-0.10
-0.20
-0.30
-0.40
2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5
Time (100µs/div)
Input Voltage (V)
Light Load Switching Waveform
Light Load Switching Waveform
80
0
-40
0.3
0.2
0.1
0.0
-0.1
80
40
0
-40
-80
0.3
0.2
0.1
0.0
-0.1
Time (5µs/div)
Time (200µs/div)
Light Load Switching Waveform
Light Load Switching Waveform
0
-40
0.3
0.2
0.1
0.0
-0.1
80
40
0
-40
0.2
0.1
0.0
Inductor Ripple Current
(bottom) (A)
40
(VIN = 3.6V; VOUT = 1.8V; IOUT = 1mA; CFF = 100pF)
Output Voltage (AC coupled)
(top) (mV)
80
Inductor Ripple Current
(bottom) (A)
Output Voltage (AC coupled)
(top) (mV)
(VIN = 3.6V; VOUT = 1.8V; IOUT = 1mA; CFF = 100pF)
Time (5µs/div)
Inductor Ripple Current
(bottom) (A)
40
Output Voltage (AC coupled)
(top) (mV)
(VIN = 3.6V; VOUT = 1.8V; IOUT = 1mA; CFF = 0pF)
Inductor Ripple Current
(bottom) (A)
Output Voltage (AC coupled)
(top) (mV)
(VIN = 3.6V; VOUT = 1.8V; IOUT = 1mA; CFF = 0pF)
-0.1
Time (500µs/div)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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DATA SHEET
AAT2789
Low Noise, High Frequency Dual Step-Down Converter
Typical Characteristics – Channel 1
Heavy Load Switching Waveform
Enable Soft Start
(VIN = 3.6V; VOUT = 1.8V; IOUT = 1.7A)
EN
(2V/div)
VOUT
(1V/div)
IIN
(500mA/div)
Time (100µs/div)
8
20
10
0
-10
2.0
-20
1.8
1.6
1.4
1.2
Time (500ns/div)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202047A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 11, 2012
Inductor Ripple Current
(bottom) (A)
Output Voltage (AC coupled)
(top)(mV)
(VIN = 3.6V; VOUT = 1.8V; IOUT = 1.7A)
DATA SHEET
AAT2789
Low Noise, High Frequency Dual Step-Down Converter
Typical Characteristics – Channel 2
Efficiency vs. Output Current
Load Regulation
(VOUT = 3.3V)
(VOUT = 3.3V)
1
100
80
70
60
50
VIN = 3.6V
VIN = 4.2V
VIN = 5V
40
1
10
100
Output Error (%)
Efficiency (%)
90
30
0.1
VIN = 3.6V
VIN = 4.2V
VIN = 5V
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1
0.1
1000
1
Output Current (mA)
Efficiency vs. Output Current
Load Regulation
(VOUT = 2.5V)
(VOUT = 2.5V)
1
70
60
VIN = 3V
VIN = 3.6V
VIN = 4.2V
VIN = 5V
50
40
10
100
Output Error (%)
Efficiency (%)
80
1
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1
0.1
1000
1
Output Current (mA)
10
100
1000
Output Current (mA)
Efficiency vs. Output Current
Load Regulation
(VOUT = 1.8V)
(VOUT = 1.8V)
100
1
0.8
80
70
60
50
VIN = 2.7V
VIN = 3.6V
VIN = 4.2V
40
1
10
Output Current (mA)
100
1000
Output Error (%)
90
Efficiency (%)
1000
VIN = 3V
VIN = 3.6V
VIN = 4.2V
VIN = 5V
0.8
90
30
0.1
100
Output Current (mA)
100
30
0.1
10
0.6
0.4
0.2
0
-0.2
-0.4
VIN = 2.7V
VIN = 3.6V
VIN = 4.2V
-0.6
-0.8
-1
0.1
1
10
100
1000
Output Current (mA)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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9
DATA SHEET
AAT2789
Low Noise, High Frequency Dual Step-Down Converter
Typical Characteristics – Channel 2
Line Regulation
Switching Frequency vs. Temperature
(VOUT = 1.8V; IOUT = 800mA)
0.5
1mA
400mA
600mA
800mA
0.4
0.3
Accuracy (%)
Switching Frequency (MHz)
(VOUT = 1.8V)
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
2.08
2.06
2.04
2.02
2
1.98
1.96
1.94
1.92
-40
-15
10
Input Voltage (V)
35
60
85
Temperature (°C)
Frequency Variation vs. Input Voltage
Output Voltage Error vs. Temperature
(VIN = 3.6V; VO = 1.8V, IOUT = 400mA)
2.0
Output Voltage Error (%)
Frequency Variation (%)
4
3
2
1
0
-1
-2
VOUT = 1.8V
VOUT = 3V
-3
-4
2.7
3.1
3.5
3.9
4.3
4.7
5.1
1.0
0.0
-1.0
-2.0
-40
5.5
-20
0
550
60
55
45
40
35
30
25
85°C
25C
-40°C
20
15
3.1
3.5
3.9
4.3
Input Voltage (V)
80
100
120°C
100°C
85°C
25°C
500
50
RDS(ON) (mΩ
Ω)
Supply Current (µA)
60
P-Channel RDS(ON) vs. Input Voltage
No Load Quiescent Current vs. Input Voltage
10
40
Temperature (°C)
Input Voltage (V)
10
2.7
20
4.7
5.1
450
400
350
300
250
5.5
200
2.5
3
3.5
4
4.5
5
Input Voltage (V)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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5.5
6
DATA SHEET
AAT2789
Low Noise, High Frequency Dual Step-Down Converter
Typical Characteristics – Channel 2
Load Transient
N-Channel RDS(ON) vs. Input Voltage
(VIN = 3.6V; VOUT = 1.8V; COUT = 10µF; CFF = 100pF)
500
RDS(ON) (mΩ
Ω)
Output Voltage (top) (V)
120°C
100°C
85°C
25°C
450
400
350
300
250
200
2.5
3
3.5
4
4.5
5
5.5
1.8
1.7
300mA
1mA
300mA
Time (50µs/div)
Load Transient
Load Transient
(VIN = 3.6V; VOUT = 1.8V; COUT = 4.7µF; CFF = 0pF)
(VIN = 3.6V; VOUT = 1.8V; COUT = 10µF; CFF = 0pF)
400mA
300mA
400mA
300mA
Output Voltage (top) (V)
1.7
1.9
1.8
1.7
400mA
300mA
400mA
Time (50µs/div)
300mA
Output and Inductor Current
(100mA/div)
1.8
Output and Inductor Current
(100mA/div)
1.9
Output Voltage (top) (V)
1mA
6
Input Voltage (V)
Time (50µs/div)
Load Transient
Line Transient
(VIN = 3.6V; VOUT = 1.8V; COUT = 10µF; CFF = 100pF)
(VOUT = 1.8V; VIN = 3.6V to 4.2V; IOUT = 400mA; CFF = 0pF)
400mA
300mA
400mA
300mA
Time (50µs/div)
Input Voltage (top) (V)
1.7
4.8
4.2
3.6
3
1.84
1.82
1.8
1.78
1.76
Output Voltage (bottom) (V)
1.8
Output and Inductor Current
(100mA/div)
1.9
Output Voltage (top) (V)
Output and Inductor Current
(100mA/div)
1.9
550
Time (50µs/div)
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11
DATA SHEET
AAT2789
Low Noise, High Frequency Dual Step-Down Converter
Typical Characteristics – Channel 2
Output Ripple
Output Ripple
(VOUT = 1.8V; VIN = 3.6V; IOUT = 1mA; CFF = 0pF)
(VOUT = 1.8V; VIN = 3.6V; IOUT = 400mA; CFF = 0pF)
0.02
-0.01
0.1
0.05
0
0.01
0
-0.01
0.6
-0.02
0.4
0.2
0
-0.05
-0.2
Time (10µs/div)
Time (200ns/div)
Soft Start
4
3
2
1
0
0.5
0
-0.5
Input Current (bottom) (A)
Enable Voltage (top) (V)
Output Voltage (middle) (V)
(VIN = 3.6V; VOUT = 1.8V; IOUT = 400mA)
Time (100µs/div)
12
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Inductor Current
(bottom) (A)
0
Output Voltage (top) (V)
0.01
Inductor Current
(bottom) (A)
Output Voltage (top) (V)
0.02
DATA SHEET
AAT2789
Low Noise, High Frequency Dual Step-Down Converter
Functional Block Diagram
VCC1,2
OT
OSC
VP1
Comp.
FB1
Error
Amp
Logic
Voltage
Ref 1
LX1
Control
Logic
EN1
PGND1
VP2
OT
Comp.
FB2
Error
Amp
Logic
Voltage
Ref 2
EN2
OSC
LX2
Control
Logic
PGND2
AGND1,2
Functional Description
The AAT2789 is a 2-channel synchronous step-down
(Buck) 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 incorporate a unique low noise architecture which reduces
output ripple and spectral noise.
The device utilizes a high switching frequency to minimize external filter sizing. Peak current mode control
eliminates external compensation while optimizing transient performance and stability.
The device requires a minimum of external components
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. Adjustable output voltage is provided. Light load operating mode provides high efficiency
over the entire load range. The enable inputs, when
pulled low, force the respective converter into a low
power non-switching state consuming less than 1μA of
current. Low quiescent current enables excellent life for
battery powered systems.
Additional features include integrated soft start to limit
inrush current. Soft start limits the current surge seen at
the input and eliminates output voltage overshoot.
For overload conditions, the peak input current is limited. Also, over-temperature protection safeguards the
device from damage due to high operating temperature
or fault conditions. The junction over-temperature
threshold is 140°C with 15°C of hysteresis. Under voltage lockout (UVLO) guarantees sufficient input voltage
bias prior to turn-on.
The AAT2789 is available in the 3x4mm Pb-free 16-pin
TDFN package and is rated over the -40°C to 85°C operating temperature range.
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13
DATA SHEET
AAT2789
Low Noise, High Frequency Dual Step-Down Converter
Applications Information
Inductor Selection
Both step-down converters use peak current mode control with slope compensation to maintain stability for
duty cycles greater than 50%. When the duty cycle
exceeds 50%, the inductor value must be selected to
maintain the prescribed down-slope in accordance with
the internal slope compensation requirements.
Input Capacitor
Select a 10μF to 22μF 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 CIN. The calculated value varies with input voltage and is a maximum when VIN is double the output
voltage.
CIN =
Channel 1
The internal slope compensation for the adjustable and
low voltage fixed versions of Channel 1 is 0.75A/μs. This
equates to a slope compensation that is 75% of the
inductor current down slope for a 1.8V output and 1.8μH
inductor.
0.75 ⋅ VO 0.75 ⋅ 1.2V
=
= 1.2µH
m
A
0.75 µs
The inductor should be set equal to the output voltage
numeric value in microhenries (μH). This guarantees sufficient internal slope compensation. Manufacturer’s specifications list both the inductor DC current rating, which
is a thermal limitation, and the peak current rating,
which is determined by the saturation characteristics.
The inductor should not show any appreciable saturation
under normal load conditions. Some inductors may meet
the peak and average current ratings yet result in excessive losses due to a high DCR. Always consider the
losses associated with the DCR and its effect on the total
converter efficiency when selecting an inductor.
⎛ VPP
⎞
- ESR · FS
⎝ IO
⎠
VO ⎛
V ⎞
1
· 1 - O = for VIN = 2 · VO
VIN ⎝
VIN ⎠
4
CIN(MIN) =
0.75 ⋅ VO 0.75 ⋅ 1.8V
A
m=
=
= 0.75
L
1.8µH
µs
L=
V ⎞
VO ⎛
· 1- O
VIN ⎝
VIN ⎠
1
⎛ VPP
⎞
- ESR · 4 · FS
⎝ IO
⎠
Always examine the ceramic capacitor DC voltage coefficient characteristics when selecting the proper value.
For example, the capacitance of a 10μF, 6.3V, X5R ceramic capacitor with 5.0V DC applied is actually about 6μF.
The maximum input capacitor RMS current is:
IRMS = IO ·
VO ⎛
V ⎞
· 1- O
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 ⎛
V ⎞
· 1- O =
VIN ⎝
VIN ⎠
D · (1 - D) =
0.52 =
1
2
Channel 2
The slope compensation for Channel 2 output is set at
0.75A/μs. This equates to a slope compensation that is
75% of the inductor current down slope for a 1.8V output and 1.8μH inductor:
m=
L=
14
0.75 ⋅ VO 0.75 ⋅ 1.8V
A
=
= 0.75
L
1.8µH
µs
0.75 ⋅ VO 0.75 ⋅ 3.3V
=
= 3.3µH
m
A
0.75 µs
For VIN = 2 · VO
IRMS(MAX) =
VO
IO
2
⎛
V ⎞
· 1- O
The term VIN ⎝ 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.
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DATA SHEET
AAT2789
Low Noise, High Frequency Dual Step-Down Converter
The input capacitor provides a low impedance loop for
the edges of pulsed current drawn by the AAT2789. 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 Figures 1 and 2).
A laboratory test set-up typically consists of two long
wires running from the bench power supply to the evaluation 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 during 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 inductance cannot be reduced to a level that does not affect
the converter performance, a high ESR tantalum or aluminum electrolytic should be placed in parallel with the
low ESR/ESL bypass ceramic capacitor. This dampens
the high Q network and stabilizes the system.
Output Capacitor
COUT =
3 · ΔILOAD
VDROOP · FS
Once the average inductor current increases to the DC
load level, the output voltage recovers. The above equation establishes a limit on the minimum value for the
output capacitor with respect to load transients.
The internal voltage loop compensation also limits the
minimum output capacitor value to 10μF. This is due to
its effect on the loop crossover frequency (bandwidth),
phase margin, and gain margin. Increased output capacitance will reduce the crossover frequency with greater
phase margin.
The maximum output capacitor RMS ripple current is
given by:
IRMS(MAX) =
VOUT · (VIN(MAX) - VOUT)
L · FS · VIN(MAX)
2· 3
1
·
Dissipation due to the RMS current in the ceramic output
capacitor ESR is typically minimal, resulting in less than
a few degrees rise in hot-spot temperature.
Channel 2
The output capacitor limits the output ripple and provides holdup during large load transitions. A 4.7μF to
10μF X5R or X7R ceramic capacitor typically provides
sufficient bulk capacitance to stabilize the output during
large load transitions and has the ESR and ESL characteristics necessary for low output ripple.
Channel 1
The output capacitor limits the output ripple and provides holdup during large load transitions. A 10μF to
22μF X5R or X7R ceramic capacitor typically provides
sufficient bulk capacitance to stabilize the output during
large load transitions and has the ESR and ESL characteristics necessary for low output ripple.
The output voltage droop due to a load transient is
dominated by the capacitance of the ceramic output
capacitor. During a step increase in load current, the
ceramic output capacitor alone supplies the load current
until the loop responds. Within two or three switching
cycles, the loop responds and the inductor current
increases to match the load current demand. The relationship of the output voltage droop during the three
switching cycles to the output capacitance can be estimated by:
Output Voltage
The AAT2789 output voltages are programmed with
external resistors R1, R2 (Channel 1) and R3, R4 (Channel
2). To limit the bias current required for the external feedback resistor string while maintaining good noise immunity, the minimum suggested value for R2 and R4 are
59kΩ. Although a larger value will further reduce quiescent current, it will also increase the impedance of the
feedback node, making it more sensitive to external noise
and interference. Table 1 summarizes the resistor values
for various output voltages with R2 and R4 set to either
59kΩ for good noise immunity or 221kΩ for reduced no
load input current.
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15
DATA SHEET
AAT2789
Low Noise, High Frequency Dual Step-Down Converter
VOUT(V)
R2, 4 = 59k
R1, 3(k)
R2, 4 = 221k
R1, 3(k)
0.6
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.8
1.85
2.0
2.5
3.0
3.3
0
19.6
29.4
39.2
49.9
59.0
68.1
78.7
88.7
118
124
137
187
237
267
0
75.0
113
150
187
221
261
301
332
442
464
523
715
887
1000
Table 1: AAT2789 Resistor Values for Various
Output Voltages.
Thermal Calculations
There are three types of losses associated with the
AAT2789 step-down converter: switching losses, conduction losses, and quiescent current losses. Conduction
losses are associated with the RDS(ON) characteristics of
the power output switching devices. Switching losses are
dominated by the gate charge of the power output
switching devices. At full load, assuming continuous conduction mode (CCM), a simplified form of both stepdown converters is given by:
PTOTAL =
+
IO12 · (RDSON(HS) · VO1 + RDSON(L) · [VIN -VO1])
VIN1
IO22 · (RDSON(HS) · VO2 + RDSON(L) · [VIN -VO2])
VIN2
+ (tsw · FS · IO1 + IQ1) · VIN1
For the condition where the step-down converter is in
dropout at 100% duty cycle, the total device dissipation
reduces to:
PTOTAL = IO12 · RDS(ON)H1 + IQ1 · VIN1 + IO22 · RDS(ON)H2 + IQ2 · VIN2
Since RDS(ON), quiescent current, and switching losses all
vary with input voltage, the total losses should be investigated over the complete input voltage range.
Given the total losses, the maximum junction temperature can be derived from the θJA for the TDFN34-16
package, which is 50°C/W.
TJ(MAX) = PTOTAL · ΘJA + TAMB
PCB Layout
The suggested PCB layout for the AAT2789 is shown in
Figures 1 and 2. The following guidelines should be used
to help ensure a proper layout.
1.
2.
3.
4.
+ (tsw · FS · IO2 + IQ2) · VIN2
IQ1 and IQ2 are the step-down converter quiescent currents for Channel 1 and Channel 2 respectively. The term
tSW is used to estimate the full load step-down converter
switching losses.
5.
6.
7.
16
The input and output capacitors C1, C2, C3, and C4
should be connected as closely as possible to the
input and output pins.
Output capacitors and inductors (C2, C3 and L1; C4
and L2) should connect as closely as possible. The
connection of the inductor (L1, L2) to the LX1 and
LX2 pins should be as short as possible.
The feedback traces or FB pins should be separated
from any power traces and connect as closely as
possible to the load point. Sensing along a highcurrent load trace will degrade DC load regulation.
The resistance of the trace from the load return to
PGND should be kept to a minimum. This will help to
minimize any error in DC regulation due to differences in the potential of the internal signal ground
and the power ground.
The lower R2 (FB1) and R4 (FB2) resistor's grounds
should be connected to the AGND1 and AGND2 pins.
C5, C6 are optional feed forward capacitors for both
channels to stabilize the output voltage during large
load transitions.
For good thermal coupling, PCB vias are required
from the pad for the TDFN paddle to the bottom
ground plane.
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DATA SHEET
AAT2789
Low Noise, High Frequency Dual Step-Down Converter
Printed Circuit Board Layout Recommendations
Figure 1: AAT2789 Evaluation Board
Component Side Layout.
Figure 2: AAT2789 Evaluation Board
Solder Side Layout.
U1
1
LX1
1.5μH
VIN
7
11
VP1
FB1
VP1
AGND1
C1
10μF
5
3
VCC1
LX2
4
EN1
FB2
VP2
AGND2
13
VCC2 PGND1
14
C3
10μF
OUT2
L2
3.3μH
AAT2789
6
C2
10μF
C5
opt
R1
59K
R2
59K
12
8
OUT1
L1
9
NC
15
16
R3
267K
C6
opt
R4
59K
C4
10μF
10
2
EN2
PGND2
TDFN34-16
Figure 3: AAT2789 Evaluation Board Schematic.
Symbol
Part Number
U1
C1, C2, C3, C4
C5
C6
L1
L2
R1-R4
AAT2789
GRM188R60J106ME47D
Generic
Generic
LQM2HPN1R5MG0
TFC252008MBT
Generic
Description
Skyworks 2-Output Buck TDFN34-16
Cap, MLC, 10uF/6.3V, 0603 ( HMAX=0.9mm), Murata
Cap,10nF/6.3V,0402
Cap,100pF/6.3V,0402
1.5uH, ISAT=3A, 2x2.5x0.9mm (HMAX=0.95mm), shielded chip inductor, Murata
3.3uH, ISAT=0.52A, 2x2.5x1mm (HMAX=1.0mm), non-shielded chip inductor, TDK
Carbon Film resistor, 0402
Qty
1
4
1
1
1
1
1
Table 2: AAT2789 Evaluation Board Bill of Materials.
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17
DATA SHEET
AAT2789
Low Noise, High Frequency Dual Step-Down Converter
Design Example
Specifications
VO1 = 1.2V @ 1.5A (adjustable using 0.6V version), Pulsed Load ILOAD = 1.5A
VO2 = 3.3V @ 500mA (adjustable using 0.6V version), Pulsed Load ILOAD = 0.5A
VIN = 2.7V to 4.2V (3.6V nominal)
FS1 = 1.8MHz, FS2 = 2MHz
m = 0.75A/μs
TAMB = 85°C in TDFN34-16 Package
Channel 1 Inductor
L=
0.75 ⋅ VO
0.75 ⋅ 1.2V
=
= 1.2µH; use 1.5µH
m
A
0.75 µs
For TDK inductor LQM2PHN1R5MG0, 1.5μH, DCR = 70mmax.
ΔI =
VO1
1.2V
⎛ VO1⎞
⎛ 1.2V ⎞
· 1=
· 1= 317mA
L1 ⋅ FS ⎝
VIN ⎠ 1.5µH ⋅ 1.8MHz ⎝ 4.2V ⎠
IPK1 = IO1 +
ΔI
= 1.5A + 0.317A = 1.817A
2
PL1 = IOUTBUCK2 ⋅ DCR = 1.5A2 ⋅ 70mΩ = 158mW
Channel 2 Inductor
L=
0.75 ⋅ VO
0.75 ⋅ 3.3V
=
= 3.3µH
m
A
0.75 µs
For TDK inductor TFC252008MBT, 3.3μH, DCR = 100mmax.
ΔI =
VO1
3.3V
⎛ VO2⎞
⎛ 3.3V ⎞
· 1=
· 1= 107mA
L1 ⋅ FS ⎝
VIN ⎠ 3.3µH ⋅ 1.8MHz ⎝ 4.2V ⎠
IPK1 = IO1 +
ΔI
= 0.5A + 0.054A = 0.55A
2
PL1 = IOUTBUCK2 ⋅ DCR = 0.55A2 ⋅ 100mΩ = 30.1mW
18
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DATA SHEET
AAT2789
Low Noise, High Frequency Dual Step-Down Converter
Channel 1 Output Capacitor
VDROOP= 0.12V
COUT3 =
3 · ΔILOAD
3 · 1.5A
=
= 20.8µF; use 22µF
0.12V · 1.8MHz
VDROOP · FS
IRMS(MAX) =
VOUT · (VIN(MAX) - VOUT)
1
1.2V · (4.2V - 1.2V)
·
= 92mA
=
1.5µH
· 1.8MHz · 4.2V
·
V
L
·
F
2· 3
2· 3
S
IN(MAX)
1
·
PESR = ESR · IRMS2 = 5mΩ · 24mA2 = 3µW
Channel 2 Output Capacitor
VDROOP= 0.1V
COUT3 =
3 · ΔILOAD
3 · 0.5A
=
= 7.5µF; use 10µF
0.1V · 2MHz
VDROOP · FS
IRMS(MAX) =
VOUT · (VIN(MAX) - VOUT)
1
3.3V · (4.2V - 3.3V)
·
= 30mA
=
3.3µH
· 2MHz · 4.2V
·
V
L
·
F
2· 3
2· 3
S
IN(MAX)
1
·
PESR = ESR · IRMS2 = 5mΩ · 30mA2 = 4.5µW
Input Capacitor
Input Ripple VPP1 = 50mV, VPP2 = 25mV
CIN1 =
CIN2 =
⎛ VPP1
⎝ IO1
1
1
=
= 4.9µF
⎞
⎛ 50mV
⎞
- 5mΩ · 4 · 1.8MHz
- ESR · 4 · FS
⎠
⎝ 1.5A
⎠
⎛ VPP2
⎝ IO2
1
1
=
= 3µF
⎞
⎛ 25mV
⎞
- 5mΩ · 4 · 2MHz
- ESR · 4 · FS
⎠
⎝ 0.5A
⎠
CIN = CIN1+ CIN2 = 4.9μF+3μF= 7.9μF; use 10μF
IRMS(MAX) =
IO1 + IO2
= 1A
2
P = ESR · IRMS2 = ESR · (1A)2 = 5mW
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19
DATA SHEET
AAT2789
Low Noise, High Frequency Dual Step-Down Converter
AAT2789 Losses
Total loss can be estimated by calculating the dropout (VIN = VO) losses where the power MOSFETs RDS (ON) will be at the
maximum value. All values assume an 85°C ambient temperature and a 120°C junction temperature with the TDFN
50°C/W package.
PTOTAL = IO12 · RDS(ON)H1 + IQ1 · VIN1 + IO22 · RDS(ON)H2 + IQ2 · VIN2
PTOTAL = 1.5A2 · 120mΩ + 70µA · 4.2 + 0.52 · RDS(ON)H2 + 70µA · 4.2V = 270mW
TJ(MAX)= TAMB + ΘJA · PLOSS = 85°C + (50°C/W) · 270mW = 99°C
20
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DATA SHEET
AAT2789
Low Noise, High Frequency Dual Step-Down Converter
Ordering Information
Output Voltage
Package
Channel 1
Channel 2
Marking1
Part Number (Tape and Reel)2
TDFN34-16
Adjustable (0.6)
Adjustable (0.6)
3JXYY
AAT2789IRN-AA-T1
Skyworks Green™ products are compliant with
all applicable legislation and are halogen-free.
For additional information, refer to Skyworks
Definition of Green™, document number
SQ04-0074.
Legend
Output Voltage
Code
Adjustable (0.6)
A
1. XYY = assembly and date code.
2. Sample stock is generally held on part numbers listed in BOLD.
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21
DATA SHEET
AAT2789
Low Noise, High Frequency Dual Step-Down Converter
Package Information1
TDFN34-16
3.000 ± 0.050
1.600 ± 0.050
Detail "A"
3.300 ± 0.050
4.000 ± 0.050
Index Area
0.350 ± 0.100
Top View
0.230 ± 0.050
Bottom View
C0.3
(4x)
0.050 ± 0.050
0.450 ± 0.050
0.850 MAX
Pin 1 Indicator
(optional)
0.229 ± 0.051
Side View
Detail "A"
All dimensions in millimeters.
1. The leadless package family, which includes QFN, TQFN, DFN, TDFN and STDFN, has exposed copper (unplated) at the end of the lead terminals due to the manufacturing
process. A solder fillet at the exposed copper edge cannot be guaranteed and is not required to ensure a proper bottom solder connection.
Copyright © 2012 Skyworks Solutions, Inc. All Rights Reserved.
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202047A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 11, 2012