AP3407/A

Document number: DS37553 Rev. 2 - 2

2 of 10

www.diodes.com

May 2016

© Diodes Incorporated

AP3407/A

Pin Descriptions

Pin Number

Pin Name

Function

AP3407

AP3407A

1

3

EN

Control input pin. Forcing this pin above 1.5V enables the IC. Forcing this

pin below 0.4V shuts down the IC. When the IC is in shutdown mode, all

functions are disabled to decrease the supply current below 1.2A

2

2

GND

Ground pin

3

5

SW

Power switch output pin. Inductor connection to drain of the internal PFET

and NFET switches

4

1

VIN

Supply input pin. Bypass to GND with a 4.7µF or greater ceramic capacitor

5

4

FB

This is the feedback pin of the device. Connect this pin directly to the output

if the fixed output voltage version is used. For the adjustable version an

external resistor divider is connected to this pin.

Functional Block Diagram

VOLTAGE

REFERENCE

OSCILLATOR

CURRENT

SENSE

ERROR

AMPLIFIER

PWM

COMPARATOR

MAX

CURRENT LIMIT

0.6V

0.4V

LOGIC

CLK

SHORT

CIRCUIT

PROTECTION

REVERSE

COMPARATOR

EN

FB

GND

SW

GND

VIN

VIN

1 (3)

5 (4)

2 (2)

4 (1)

3 (5)

A (B)

A for AP3407

B for AP3407A

4 (1)

2 (2)