[AP3440]

016008997-E-00

2016/10

- 2 -

3. Table of Contents

1.

General Description ............................................................................................................................ 1

2.

Features .............................................................................................................................................. 1

3.

Table of Contents................................................................................................................................ 2

4.

Block Diagram..................................................................................................................................... 3

5.

Ordering Guide.................................................................................................................................... 3

6.

Pin Configurations and Functions....................................................................................................... 4

■ Pin Configurations ......................................................................................................................... 4

■ Functions ....................................................................................................................................... 4

7.

Absolute Maximum Ratings ................................................................................................................ 5

8.

Recommended Operating Conditions................................................................................................. 6

9.

Electrical Characteristics..................................................................................................................... 7

10. Timing Chart........................................................................................................................................ 8

11. Functional Descriptions....................................................................................................................... 9

11.1 Normal Operation........................................................................................................................ 9

11.2 External Synchronous Function.................................................................................................. 9

11.3 Extrenal Synchronous Clock Output........................................................................................... 9

11.4 Power Good Function ................................................................................................................. 9

11.5 Over Voltage Protection (OVP)................................................................................................. 10

11.6 Under Voltage Lockout (UVLO)................................................................................................ 10

11.7 Over Current Protection (OCL: Over Current Limit) ................................................................. 10

11.8 Thermal Protection (TSD: Thermal Shut Down)....................................................................... 11

11.9 Output Capacitor Discharge ..................................................................................................... 11

12. Typical Characteristics...................................................................................................................... 12

13. Recommended External Circuits ...................................................................................................... 13

14. Layout Examples............................................................................................................................... 14

■ VIN Capacitor Wiring ................................................................................................................... 14

■ GND Wiring.................................................................................................................................. 14

■ Switching Node Connection ........................................................................................................ 14

■ Soft Start Capacitor ..................................................................................................................... 14

15. Package ............................................................................................................................................ 15

■ Outline Dimensions ..................................................................................................................... 15

■ Recommended Land ................................................................................................................... 15

■ Marking ........................................................................................................................................ 15

16. Revision History ................................................................................................................................ 16

IMPORTANT NOTICE .......................................................................................................................... 17