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Advanced Analogic Technologies

AAT2789 Datasheet Preview

AAT2789 Datasheet

High Frequency Dual Step-Down Converter

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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




Advanced Analogic Technologies

AAT2789 Datasheet Preview

AAT2789 Datasheet

High Frequency Dual Step-Down Converter

No Preview Available !

SystemPowerTM
PRODUCT DATASHEET
AAT2789
Low Noise, High Frequency Dual Step-Down Converter
Pin Descriptions
Pin #
1
2
3
4
5
6
7,8
9
10
11
12
13
14
15
16
EP
Symbol
N/C
PGND2
LX2
VP2
VCC1
EN1
VP1
LX1
PGND1
FB1
AGND1
VCC2
EN2
FB2
AGND2
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 volt-
age 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 volt-
age 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
1
2
3
4
5
6
7
8
16 AGND2
15 FB2
14 EN2
13 VCC2
12 AGND1
11 FB1
10 PGND1
9 LX1
2
www.analogictech.com
2789.2008.03.1.0


Part Number AAT2789
Description High Frequency Dual Step-Down Converter
Maker Advanced Analogic Technologies
Total Page 22 Pages
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