LP3318-00

May.-2018

www.lowpowersemi.com

Page 2 of 6

Preliminary Datasheet

LP3318

Functional Pin Description

Package Type

Pin Configurations

SOT23-5

1

3

5

4

LX

VIN

SOT23-5

TOP VIEW

2

GND

FB

EN

Pin Description

Pin

Name

Description

1

LX

Output Switching Node. LX is the drain of the internal low-side N-Channel MOSFET and

high-side P-Channel MOSFET. Connect the inductor to LX to Complete the step-up converter.

2

GND

Ground.

3

FB

Regulation Feedback Input. Connect to an external resistive voltage divider from the output to

FB to set the output voltage.

4

EN

5

VIN

Power Supply pin.

Function Block Diagram

FB

EN

SHUTDOWN

CIRCUITRY

UVLO

SOFT

START

CONTROL

AND DRIVER

LOGIC

SLOPE

COMPENSASION

OSCILLATOR

OVP

VIN

LX

GND

OTP

SHORT

CIRCUIT

COMP.

Error

Amp.

PWM

COMP.

CURRENT

SENSE

AMP.

10μA

0.3V

1.23V

Σ

+

+

+

+

-

-

-

-