AAT1121 Datasheet, PDF (2/20 Pages) Advanced Analogic Technologies – 1.5MHz, 250mA Step-Down Converter

AAT1121
1.5MHz, 250mA Step-Down Converter
Pin Descriptions
Pin #
1
Symbol
VP
2
VIN
3
GND
4
FB
5
N/C
6
EN
7
LX
8
PGND
EP
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
TDFN22-8
(Top View)
VP ¹
VIN ²
GND ³
FB 4
8 _PGND
7 _LX
6 _EN
5 _N/C
2
1121.2006.04.1.0