LP3220-02

Jun.-2015

www.lowpowersemi.com

Page 2 of 12

Preliminary Datasheet

LP3220

Typical Application Circuit

Functional Pin Description

Package Type

Pin Configurations

SOT23-5

VIN

GND

EN

LX

FB

1

2

3

4

5

Top View

Pin Description

Pin

Name

Description

1

EN

Enable pin. Active high. There is an internal 500K resistor pull down when EN is

floating.

2

GND

Ground.

3

LX

Switch Mode Connection to Inductor. This pin connects to the drains of the internal main

and synchronous power MOSFET switches.

4

VIN

Supply Input. Power supply input pin. Must be closely decoupled to AGND with a 10μF

or greater ceramic capacitor.

5

FB

Feedback Input. Connect FB to the center point of the external resistor divider. Normal

voltage for this pin is 0.6V.

EN

1

LX

3

GND

2

FB

5

VIN

4

LP3220

1.0uH

C2

10uF

R1

20K

R2

10K

C1

10uF

VIN

VOUT

C3

22pF