500mA Step-Down Converter
Pin Descriptions
Pin #
1
2
3
4
5
6
7
8
EP
AAT1120
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
1120.2007.01.1.0
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
