AAT1121 Datasheet, PDF (2/19 Pages) Advanced Analogic Technologies – 1.5MHz, 250mA Step-Down Converter

DATA SHEET
AAT1121
1.5MHz, 250mA Step-Down Converter
Pin Descriptions
Pin #
1
2
3
4
5
6
7
8
EP
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
TDFN22-8/STDFN22-8
(Top View)
VP ¹
VIN ²
GND ³
FB 4
8 _PGND
7 _LX
6 _EN
5 _N/C
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201974B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 15, 2013