PRODUCT DATASHEET
AAT2784
SystemPowerTM
3-Channel Step-Down DC/DC Converter
Pin Descriptions
Pin #
Symbol Function
1
PGND2
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 volt-
age to the desired value.
2
FB2
3
4
5
6
7
EN1
EN2
AGND
IN
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.
EN3
Feedback input pin for channel 3. Connect an external resistor divider to this pin to program the output volt-
age to the desired value.
8
FB3
9
10
11
PGND3
LX3
VP3
Power ground return for channel 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 volt-
age to the desired value.
12
FB1
13
14
15
16
PGND1
LX1
VP1_2
LX2
Power ground return for channel 1. Connect to the output and input capacitor return.
Power switching node for channel 1. 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 coupling to
the ground plane. See section on PCB layout guidelines.
EP
EP
Pin Configuration
TDFN34-16
(Top View)
1
2
3
4
5
6
7
8
16
LX2
VP1_2
LX1
PGND1
FB1
VP3
PGND2
FB2
EN1
EN2
AGND
IN
15
14
13
12
11
10
9
EN3
FB3
LX3
PGND3
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2
2784.2007.11.1.1
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