MB3879 View Datasheet(PDF) - Fujitsu

Part Name

Description

Manufacturer

MB3879

DC/DC Converter IC for Parallel Charging of 3/4 cell Li-ion & NiMH Batteries

Fujitsu 

MB3879

s BLOCK DIAGRAM

−INE 44

OUTC1 45

+INC1 48

−INC1 47

+INE1 43

VCC

1

<Current

+ Amp1>

−×25

<<Differencial-Control>>

<Error Amp1>

−

+

FB1 46

FB2 42

−INE2 41

<Error Amp2>

−

+INE2 40

DTC 39

−INE3 18

OUTC2 17

+INC2 15

IN1 14

+INE3 19

+

<<Dynamically-Contorl>>

<<Current-Contorl>>

<Current

+ Amp2>

−×25

<Error Amp3>

−

+

+

FB3 16

−INE4 32

OUTC3 33

+INC3 35

IN2 36

<Current

+ Amp3>

−×25

<Error Amp4>

−+

+

+INE4 31

FB4 34 <SOFT1>

VB

CS1 23

<MODE

Comp.1>

+

−

<MODE

Comp.2>

+

−

<MODE

Comp.3>

+

−

<MODE

Comp.4>

+

−

<VDD>

13 OUT-EA1

12 OUT-EA2

11 OUT-EC

10 OUT-EV

<PWM

Comp>

+++−

<OUT>

Drive

25 VCCO

24 OUT

VCC

bias

26 VH

(VCC − 6 V)

Voltage

<VH>

27 GNDO

−INE5 29

FB5 30

−INE6 21

R1

22.4

kΩ

R1

22.4

kΩ

<<Voltage-Contorl>>

<Error Amp5>

−

+

+

R2 R2

2.8 kΩ 2.8 kΩ

<Error Amp6>

−+

+

R3 R3

8.4 8.4

kΩ kΩ

FB6 20

<SOFT2>

VB

<UVLO>

VCC

UVLO

VB

UVLO

3V

2V

CS2 22

VDD 8

D0 2

D1 3

D2 4

D3 5

6

VSS

(4.2 V)

<REF>

(4.1 V)

<OSC>

bias

(5 V)

<VB>

37 28

9

CT TEST VB

<VR>

38

GND

<CTL> 7 CTL

6

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