UCC36451

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

2 of 8

www.unisonic.com.tw

QW-R115-014.A



PIN CONFIGURATION



PIN DESCRIPTION

PIN NO.

PIN NAME

DESCRIPTION

1

BS

Boot-Strap Pin. Supply high side gate driver.

2

IN

Power Input pin. Bypass IN to GND with a suitably large capacitor to eliminate noise on

the input to the IC.

3

SW

Power Switching Output. SW is the switching node that supplies power to the output.

Connect the output LC filter from SW to the output load.

4

LG

Gate drive for external low side N-MOSFET.

5

FB

Feedback Input. FB senses the output voltage to regulate that voltage. Drive FB with a

resistive voltage divider from the output voltage.

6

GND

Ground

7

CS1

The Current Sense 1 pin.

8

CS2

The Current Sense 2 pin.



BLOCK DIAGRAM

Internal

Regulator

PWM Control

&

Protect Logic

FB

M1

CURRENT

SENSE

AMPLIFIER

BS

IN

SW

LG

Input UVLO

7.0V/OVP

Softstart

Thermal

Protection

1V

1.1V

GND

CS1

0.1V

CS2

0.1V