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FP6373A-1.0-JUL-2013

FP6373A

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.

PG

5

Open drain power good output pin

.

FB

6

Feedback input 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

PG

Power Good

1

X

Soft

Start

90%

1MΩ

Figure 3. Block Diagram of FP6373A