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202005A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 24, 2012

2

AAT2120

500mA Low-Noise, Step-Down Converter

DATA SHEET

Pin Descriptions

Pin #

Symbol

Function

1

VP

Input power pin; connected to the source of the P-channel MOSFET. Connect to the input capacitor.

2

VIN

Input bias voltage for the converter.

3

GND

Non-power signal ground pin.

4

FB

Feedback input pin. Connect this pin to an external resistive divider for adjustable output.

5

N/C

No connect.

6

EN

Enable pin. A logic high enables normal operation. A logic low shuts down the converter.

7LX

Switching node. Connect the inductor to this pin. It is connected internally to the drain of both high- and

low-side MOSFETs.

8

PGND

Input power return pin; connected to the source of the N-channel MOSFET. Connect to the output and

input capacitor return.

EP

Exposed paddle (bottom); connect to ground directly beneath the package.

Pin Configuration

STDFN22-8

(Top View)

GND

FB

VP

VIN

EN

N/C

PGND

LX

3

4

1

2

6

5

8

7