PRODUCT DATASHEET
AAT2120
SwitchReg
TM
Pin Descriptions
Pin #
1
2
3
4
5
6
7
8
EP
500mA Low Noise Step-Down Converter
Symbol
VP
VIN
GND
FB
N/C
EN
LX
PGND
Function
Input power pin; connected to the source of the P-channel MOSFET. Connect to the input capacitor.
Input bias voltage for the converter.
Non-power signal ground pin.
Feedback input pin. Connect this pin to an external resistive divider for adjustable output.
No connect.
Enable pin. A logic high enables normal operation. A logic low shuts down the converter.
Switching node. Connect the inductor to this pin. It is connected internally to the drain of both high- and
low-side MOSFETs.
Input power return pin; connected to the source of the N-channel MOSFET. Connect to the output and
input capacitor return.
Exposed paddle (bottom); connect to ground directly beneath the package.
Pin Configuration
STDFN22-8
(Top View)
VP
VIN
GND
FB
1
2
3
4
8
7
6
5
PGND
LX
EN
N/C
2
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2120.2008.02.1.2
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