[AP2403]

MS1528-E-02

2014/01

- 4 -

5.

Pin Configurations and Functions

■ Ordering Guide

AP2403

-40C to 105C

16-pin HTSSOP

■ Pin Layout

Figure 2. Pin Layout

■ Pin Functions

No.

Pin

Name

I/O

Function

Condition

(Note 1)

1

PWGD

O

Power-Good Pin

When the output voltage reaches the level that is ±20% of the

setting voltage, this pin becomes “H”.

GND

2

FSYN

I

External Synchronous Clock Input Pin

An external clock within 20% of setting value which is set

by the resistor at the RT pin is available.

Internal pull-up

resistor to VIN

pin is 300k.

3

PWON

I

Power-ON Pin

The AP2403 starts operation by inputting a 1.5V or more

voltage to this pin.

-

4

RT

O

Operation Frequency Setting Pin

The operation frequency is determined by a resistor connected

to this pin.

HiZ (connect

an external

resistor

between the

GND)

5

SGND

Signal Ground

-

6

SS

O

Soft Start Pin

Connect a capacitor of 0.047μF or more between the SS pin

and the GND. The AP2403 charges this external capacitor

when starts up, and a Soft Start operation is executed. When

the over current protection is activated, the external capacitor

is discharged and it generates a suspended time in a hiccup

operation.

GND

7

CC

O

Output pin of Output Voltage Feedback Amplifier (Error Amp.)

Connect a resistor and a capacitor between the CC pin and the

SS pin in parallel. These devices compensate the amplifier

phase.

GND