3

FP6375-1.0-JUL-2013

FP6375

85T

fitipower integrated technology lnc.

Functional Pin Description

Pin Name

Pin No.

Pin Function

EN

1

Enable input pin.

Pull high to turn on IC, and pull low to turn off IC.

GND

2

Ground pin.

LX

3

Inductor pin.

Connect an external inductor to this switching node.

VIN

4

Power supply input pin.

Placed input capacitors as close as possible from VIN to GND to avoid

noise influence.

FB

5

Output Feedback Pin.

Connect this pin to the center point of the output resistor divider (as shown in

Figure 2) to program the output voltage:

0.

1

1

2

.

Block Diagram

EA

COMP

Compensation

Enable

Control

Slope Compensation

Control Logic

Current Limit

Logic

Control

and

Driver

Logic

Oscillator

Undervoltage

Lockout

Bias Supply

COMP

FB

GND

LX

VIN

EN

1

X

Soft

Start

1MΩ

Figure 3. Block Diagram of FP6375