AAT2511
Dual 600mA, 1MHz Step-Down DC/DC Converter
Pin Descriptions
Pin #
1, 4
Symbol
EN1, EN2
Function
Converter enable input. A logic high enables the converter channel. A logic low
forces the channel into shutdown mode, reducing the channel supply current to less
than 1µA. This pin should not be left floating. When not actively controlled, this pin
can be tied directly to the source voltage (VIN1, VIN2).
Feedback input pin. An external resistive divider ties to this point and programs the
output voltage to the desired value.
Signal ground. Return the feedback resistive divider to this ground. See section on
PCB layout guidelines and evaluation board layout diagram.
Main power ground return. Connect to the input and output capacitor return. See sec-
tion on PCB layout guidelines and evaluation board layout diagram.
Output switching node that connects to the respective output inductor.
Input supply voltage. Must be closely decoupled to the respective power gnd.
Exposed paddle (bottom). Use properly sized vias for thermal coupling to the ground
plane. See section on PCB layout guidelines.
2, 5
3, 6
7, 10
8, 11
9, 12
EP
FB1, FB2
SGND1, SGND2
GND2, GND1
LX2, LX1
VIN2, VIN1
Pin Configuration
TDFN33-12
(Top View)
EN1
FB1
SGND1
EN2
FB2
SGND2
1
2
3
4
5
6
12
11
10
9
8
7
VIN1
LX1
GND1
VIN2
LX2
GND2
2
2511.2006.02.1.2
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