3-Channel Step-Down DC/DC Converter
Description
SystemPowerTM
PRODUCT DATASHEET
AAT2785
3-Channel Step-Down DC/DC Converter
General Description
Features
The AAT2785 is a 3-channel 1.
8MHz step-down converter for applications where power efficiency and solution size are critical.
The input voltage range is 2.
7V to 5.
5V and the outputs are adjustable from 0.
6V to VIN.
The AAT2785 incorporates a unique low noise architecture which reduces ripple and spectral noise.
Channel 3 delivers up to 1.
5A output current and channels 1 and 2 deliver up to 600mA each.
The AAT2785 uses a high switching frequency to minimize the size of external components.
The AAT2785 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 AAT2785 is available in a Pb-free 16 pin TDFN34 package, and is rated over the -40°C to +85°C operating temperature range.
• VIN Range: 2.
7 to 5.
5V • Output Voltage Range: 0.
6V to VIN • Output Current:
▪ Channel 3: 1.
5A ▪ Channel 1: 600mA ▪ Channel 2: 600mA
• Low Noise Light Load Mode • Low Ripple PWM Mode • Highly Efficient Step-Down Converters • Low RDS(ON) Integrated Power Switches • 100% Duty Cycle • 1.
8MHz 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
Typical Application
• 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
VIN: 2.
7V–5.
5V
C1 10μF
C2 10μF
IN LX1
AAT2785
FB1
VP1_2 EN1
LX2 FB2
EN2 PGND
VP3 EN3
GND
LX3
FB3 PGND
L1 4.
7μH
L2 4.
7μH
L3 1.
5μH
VOUT1: 3.
3V, 600mA
VOUT2: 3.
3V, 600mA
R1 133k
R2 29.
4k
C3 4.
7μF
R...
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