9

NN30312A

Ver. CEB

PIN FUNCTIONS ( Continued )

Skip / FCCM mode select pin

Input

MODE

18

Ground pin

Ground

AGND

19

Power supply pin

Power supply

AVIN

20

No connection pin (don’t use pin)

-

N.C.

21

40

37

38

39

36

Power supply pin for Power MOSFET

Power supply

PVIN

No connection pin (don’t use pin)

-

35

Ground pin

Ground

AGND

32

30

ON/OFF control pin

Input

EN

Frequency selection pin

Input

FSEL

Supply input pin for high side FET gate driver

Output

BST

33

N.C.

34

Ground pin for radiation of heat

Ground

AGND

41

Power supply pin for radiation of heat

Power supply

PVIN

42

Soft start capacitor connect pin

Output

SS

28

No connection pin (don’t use pin)

-

N.C.

29

Power good open drain pin

Output

PGOOD

31

Power MOSFET output pin for radiation of heat

Output

LX

43

Output voltage sense pin

Input

VOUT

27

Comparator negative input pin

Input

VFB

26

LDO output pin (Power supply for internal control circuit)

Output

VREG

25

24

22

23

Description

Type

Pin name

Pin No.

Notes) Concerning detail about pin description, please refer to OPERATION and APPLICATION INFORMATION section.