UD05154

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CMOS IC

UNISONIC TECHNOLOGIES CO., LTD

2 of 5

www.unisonic.com.tw

QW-R115-040.a



MARKING

5

4

3

U5154

2

1



PIN CONFIGURATION

VIN

3

2

1

4

5

SW

GND

EN

FB



PIN DESCRIPTION

PIN NO.

PIN NAME

DESCRIPTION

1

EN

Enable pin

H: Normal operation；L: Shutdown

2

GND

Ground Pin

3

SW

Switch pin connected to the internal MOSFET switches and inductor terminal. Connect the inductor

of the output filter to this pin.

4

VIN

Power Supply Input Pin

5

FB

Feedback pin for the internal control loop. Connect this pin to the external feedback divider.



BLOCK DIAGRAM

EN

FB

Thermal

Shutdown

UVLO

Control Logic

Soft Start

GM

PWM

Vref

SW

Current Limit

Detect

Gate Drive

Valley

Current

Detect

PMOS

NMOS

SW

GND

VIN