PRODUCT DATASHEET
AAT2784
SystemPower
TM
General Description
The AAT2784 is a 3-channel 1.8MHz step-down con-
verter for applications where power efficiency and solu-
tion size are critical. The input voltage range is 2.7V to
5.5V and the outputs are adjustable from 0.6V to V
IN
.
Channel 3 delivers up to 1.5A output current and chan-
nels 1 and 2 deliver up to 300mA each. The AAT2784
uses a high switching frequency to minimize the size of
external components. The AAT2784 requires a minimum
of external components to realize a high efficiency triple-
output buck converter minimizing solution cost and PCB
footprint.
Each of the 3 regulators has an independent enable pin,
adjustable output voltage and operates with low no load
quiescent current, providing high efficiency over the
entire load range.
The AAT2784 is available in a Pb-free 16 pin TDFN34
package, and is rated over the -40°C to +85°C operating
temperature range.
3-Channel Step-Down DC/DC Converter
Features
• V
IN
Range: 2.7 to 5.5V
• Output Voltage Range: 0.6V to V
IN
• Output Current:
▪
Channel 3: 1.5A
▪
Channel 1: 300mA
▪
Channel 2: 300mA
• Highly Efficient Step-Down Converters
• Low R
DS(ON)
Integrated Power Switches
• 100% Duty Cycle
• 1.8 MHz Switching Frequency
• Internal Soft Start
• Fast 150μs Turn-On Time
• Over-Temperature Protection
• Current Limit Protection
• 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 LAN
Typical Application
AAT2784
LX1
IN
R1
267 k
FB1
L2
4.7μH
C3
4.7μF
VOUT2: 3.3V
300mA
R2
59.0k
L1
4.7μH
VOUT1: 3.3V
300mA
VIN : 2.7 – 5.5V
VP1_2
EN 1
LX2
R3
267k
FB2
R4
59.0k
C4
4.7μF
C1
10μF
EN2
PGND
L3
1.5μH
VOUT3: 1.2V
1.5A
VP3
EN 3
C2
10μF
LX3
R5
59.0k
FB3
R6
59.0k
AGND
PGND
C5
10μF
2784.2007.11.1.1
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