PRODUCT DATASHEET
AAT2113A
SwitchReg
TM
3MHz, Fast Transient 1.5A Step-Down Converter in 2mm x 2mm Package
Pin Descriptions
Pin #
1
2
3
4
5
6
7, 8
Symbol
PGND
VP
VCC
FB
AGND
EN
LX
Function
Main power ground return pin. Connect to the output and input capacitor return.
Input power supply tied to the source of the high side P-channel MOSFET.
Power supply; supplies power for the internal circuitry.
Feedback input pin. This pin is connected directly to the converter output for the 1.2V
fi
xed output version,
or connected to an external resistor divider for the adjustable output version.
Analog Ground. This pin is internally connected to the analog ground of the control circuitry.
Enable pin. A logic low disables the converter and it consumes less than 1μA of current. When connected
high, it resumes normal operation.
Switching node. Connect the inductor to this pin. It is internally connected to the drain of both high and
low side MOSFETs.
Pin Configuration
FTDFN22-8
(Top View)
PGND
VP
VCC
FB
1
2
3
4
8
7
6
5
LX
LX
EN
AGND
2
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2113A.2009.06.1.1
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