MB3827 datasheet(6/41 Pages) FUJITSU

Part #	MB3827

Description	6-ch DC/DC Converter IC With Synchronous Rectification for voltage step-up and step-down

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Manufacturer	FUJITSU [Fujitsu Component Limited.]

Direct Link	http://edevice.fujitsu.com/fmd/en/index.html

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6 / 41 page

MB3827

6

s BLOCK DIAGRAM

• General view

Drive

1-1

Drive

1-2

Drive

1-3

Drive

1-4

−

+

−

+

−

+

−

+

−

+

−

+

−

+

Drive

7

−

+

−

+

−

+

DTC1-3

DTC1-4

Error

Amp.1

SCP

Comp.1

1.26 V

1.0 V

1.26 V

RB1

SEL

Comp.

−

+

FB7

+IN7

−IN7-2

−IN7(C)8

CTL6

CS1-6

CTL5

DTC7

−IN7-1

Voffset

1.6 V

Error

Amp.7

SCP

Comp.8

VB1-1

(0.50 V)

PWM

Comp.1-1

PWM

Comp.1-2

PWM

Comp.1-3

PWM

Comp.1-4

VB1-2

(0.55 V)

VB1-4

(0.02 V)

VCC(O)1, 2

VSS(O)1, 2

OUT1-1

OUT1-2

OUT1-3

VG(O)1

OUT1-4

GND(O)1

GND(O)2, 3, 4

RB1

Drive

2-1

Drive

2-2

−

+

−

+

−

+

−

FB2

DTC2

−IN2

Error

Amp.2

SCP

Comp.2

1.26 V

1.0 V

PWM

Comp.2-1

PWM

Comp.2-2

OUT2-1

OUT2-2

Drive

3

−

+

−

+

−

+

FB3

DTC3

−IN3

Error

Amp.3

SCP

Comp.3

1.26 V

1.0 V

PWM

Comp.3

VCC(O)3, 4

VSS(O)3, 4, 5, 6

OUT3

Drive

4

−

+

−

+

−

+

FB4

DTC4

−IN4

Error

Amp.4

SCP

Comp.4

1.26 V

1.0 V

PWM

Comp.4

OUT4

Drive

5

−

+

−

+

−

+

FB5

-IN(C)5

DTC5

−IN5

Error

Amp.5

SCP

Comp.5

1.26 V

PWM

Comp.5

VCC(O)5, 6, 7

OUT5

Drive

6

−

+

−

+

−

+

FB6

OUT(A)6

−IN(A)6

10 k

Ω

48.5 k

Ω

30.1 k

Ω

−IN(C)6

DTC6

−IN6

Error

Amp.6

SCP

Comp.6

1.26 V

PWM

Comp.6

OUT6

RB7

GND(O)5, 6, 7

XENB1-6

VCC

CTL1-4, 7

OUT7

−

+

INV

Amp.6

+

−

VB : 2 V

VSCP

0.9 V

CS CTL

CTL1-4

Logic

Buff

×0.8

Power

Comp.

0.6 V

2 V

VB

RT

CT

CSCP

VREF

GND

2.5 V

−1.8 V

−1.1 V

−1.8 V

−1.1 V

−0.8 V

−0.3 V

UVLO

SCP

Ref

Power

ON/OFF

CTL

OSC

45

44

43

42

41

38

39

40

37

36

35

20

21

22

19

18

17

16

10

11

13

12

14

15

5

6

8

7

9

23

28

29

30

32

33

34

31

24

25

26

27

4

3

2

1

63

62

56

61

59

60

58

57

55

46

48

51

49

47

50

54

52

53

64

VB2

(0.04 V)

PWM

Comp.7

SCP

Comp.7

FB1

DTC1-1

−IN1

CH1

CH2

CH3

CH4

CH6

CH7

CH5

0.77 V

A

B

C

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MB3827 Datasheet(PDF) 6 Page - Fujitsu Component Limited.

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