LB8653T, LB8653FN

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Continued from preceding page.

Protection diode

Pin number

Upper side

Lower side

LB8653T

LB8653FN

Pin name

Description

VB

VCC

PGND

SGND

1

40

MD1

Control signal input

2

41

MD2

ditto

3

42

MD3

ditto

4

2

IN1

ditto

5

3

IN2

ditto

10

11

VREF

Reference voltage output

7

8

VC1

Constant-voltage setting reference input

8

9

VC2

ditto

9

10

VC3

ditto

12

15

FC

Phase compensation pin

11

14

IC

Constant-current setting reference input

Block Diagram

Note1 : When the input voltage to the IC pin is set with the resistor dividing reference voltage such as VREF,

make sure not to use “VC1”, “VC2” and “VC3”, together with the voltage-dividing resisters.

(In any mode other than shutter mode, the IC pin discharge transistor inside the IC pin switches to ON.)

Note2 : The above block diagram applies to LB8653FN. For the LB8653T, a single pin is provided for VB, VCC,

PGND, SGND, OUT7 and OUT8 respectively.

ILB01658