UD05123

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

2 of 4

www.unisonic.com.tw

QW-R115-021.E



MARKING



PIN CONFIGURATION



PIN DESCRIPTION

PIN NO.

PIN NAME

DESCRIPTION

1

EN

Enable pin

H: Normal operation；L: Shutdown

2

GND

Ground Pin

3

SW

Switch output pin. Connect external inductor here. Minimize trace area at this pin to

reduce EMI.

4

VIN

Power Supply Input Pin

5

FB

Output Feedback pin



BLOCK DIAGRAM

FB

EN

5

1

+

-

-

+

OSC

SLOPE

COMP

SET

PWM

+

-

ISENSE

AMP

VIN

4

SW

3

GND

2

+

-

IZERO

COMP

OVERLAP

CONTROL

NON-

REF

Soft-Star

ICOMP

RESET

Enable Logic

Over-Temperature

and Short-Circuit

Protection

0.6V

LOGIC