UD052012

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LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

3 of 9

www.unisonic.com.tw

QW-R115-039.a



PIN CONFIGURATION

1

2

3

5

4

LX

EN

VIN

FB

GND

1

2

3

6

4

LX

EN

VIN

FB

GND

5

PG

SOT-25

SOT-26

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PIN DESCRIPTION

PIN NO.

PIN NAME

DESCRIPTION

SOT-25

SOT-26

1

1

EN

Enable control pin. Pull high to turn the IC on, and pull low to disable the

IC. Don’t leave this pin floating.

2

2

GND

Ground pin.

3

3

LX

Power switching node. Connect an external inductor to this switching

node.

4

4

VIN

Power supply input pin. Placed input capacitors as close as possible from

VIN to GND to avoid noise influence.

5

6

FB

Voltage feedback input pin. Connect FB and VOUT with a resistive voltage

divider. This IC senses feedback voltage via FB and regulates it at 0.6V.

-

5

PG

Open drain power good output pin



BLOCK DIAGRAM

Soft

Start

Enable

Control

Slope

Compensation

Control Logic

Driver

Logic

COMP

FB

LX

EN

PG

Power Good

1

X

VREF

90%

VREF

2M

UVLO

OTP

VIN

OVP

OSC

COMP

EA

VIN

GND