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Advanced Analogic Technologies

AAT2785 Datasheet Preview

AAT2785 Datasheet

3-Channel Step-Down DC/DC Converter

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SystemPowerTM
PRODUCT DATASHEET
AAT2785
3-Channel Step-Down DC/DC Converter
General Description
Features
The AAT2785 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 VIN.
The AAT2785 incorporates a unique low noise architec-
ture 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 com-
ponents. 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
R3
133k
R4
29.4k
C4
4.7μF
VOUT3: 1.2V, 1.5A
R5
59.0k
R6
59.0k
C5
10μF
2785.2008.01.1.0
www.analogictech.com
1




Advanced Analogic Technologies

AAT2785 Datasheet Preview

AAT2785 Datasheet

3-Channel Step-Down DC/DC Converter

No Preview Available !

SystemPowerTM
PRODUCT DATASHEET
AAT2785
3-Channel Step-Down DC/DC Converter
Pin Descriptions
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
EP
Symbol
PGND2
FB2
EN1
EN2
AGND
IN
EN3
FB3
PGND3
LX3
VP3
FB1
PGND1
LX1
VP1_2
LX2
EP
Function
Power ground return pin 2. Connect to the output and input capacitor return.
Feedback input pin for channel 2. Connect an external resistor divider to this pin to program the
output voltage to the desired value.
Enable pin for channel 1. Active high.
Enable pin for channel 2. Active high.
Signal ground.
Input supply pin for device. Supplies bias for the internal circuitry.
Enable pin for channel 3. Active high.
Feedback input pin for channel 3. Connect an external resistor divider to this pin to program the
output voltage to the desired value.
Power ground return pin 3. Connect to the output and input capacitor return.
Power switching node for channel 3. Output switching node connects to the output inductor.
Input power supply pin for channel 3. Must be closely decoupled.
Feedback input pin for channel 1. Connect an external resistor divider to this pin to program the
output voltage to the desired value.
Power ground return pin 1. Connect to the output and input capacitor return.
Power switching node for channel 1 and 2. Output switching node connects to the output inductor.
Input power supply pin for channels 1 and 2. Must be closely decoupled.
Power switching node for channel 2. Output switching node connects to the output inductor.
Exposed pad. Connect to ground directly under the device. Use properly sized vias for thermal cou-
pling to the ground plane. See section on PCB layout guidelines.
Pin Configuration
TDFN34-16
(Top View)
PGND2
FB2
EN1
EN2
AGND
IN
EN3
FB3
1
2
3
4
5
6
7
8
16 LX2
15 VP1_2
14 LX1
13 PGND1
12 FB1
11 VP3
10 LX3
9 PGND3
2
www.analogictech.com
2785.2008.01.1.0


Part Number AAT2785
Description 3-Channel Step-Down DC/DC Converter
Maker Advanced Analogic Technologies
Total Page 22 Pages
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