MB3879 データシートの表示（PDF） - Fujitsu

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MB3879

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

Fujitsu 

MB3879

s ELECTRIC CHARACTERISTICS

Parameter

(VCC = VCCO = 19 V, VDD = 5 V, Charge mode = Li4C42, Ta = +25 °C)

Symbol Pin No.

Conditions

Value

Unit

Min Typ Max

VTEST1

28

Charge mode = Li4C42,

Ta = +25 °C

4.167

4.200

4.233

V

1.Reference

voltage block

[REF]

Output voltage

VTEST2

VTEST3

28

Charge mode = Li4C42,

Ta = −30 °C to +85 °C

4.158

4.200

4.242

V

28

Charge mode = Li4C41,

Ta = +25 °C

4.063

4.100

4.137

V

VTEST4

28

Charge mode = Li4C42,

Ta = −30 °C to +85 °C

4.050

4.100

4.150

V

2.Control

circuit bias

voltage block

[VB]

Output voltage

Input stability

Load stability

VB1

VB2

Line

Load

9 Ta = +25 °C

4.95 5.00 5.05 V

9 Ta = −30 °C to +85 °C 4.94 5.00 5.06 V

9

VCC = VCCO = 8 V to

25 V



3

10 mV

9 VB = 0 mA to −1 mA

 1 10 mV

short-circuit output

current

los

9 VB = 1 V

−25 −15 −5 mA

Threshold voltage

3. Under

voltage lockout Hysteresis width

protection

circuit block

[UVLO]

Threshold voltage

VTLH

VTHL

VH

VTLH

VTHL

1 VCC = VCCO =

1 VCC = VCCO =

1



9 VB =

9 VB =

6.0 6.2 6.4 V

5.0 5.2 5.4 V

 1*1  V

2.5 2.7 2.9 V

2.3 2.5 2.7 V

Hysteresis width

VH

9



 0.2*1  V

4. Soft-start

block

[SOFT1,

SOFT2]

Charge current

ICS

22, 23



−14 −10 −6 µA

Oscillation frequency fOSC

24 CT = 100 pF

240 300 360 kHz

5. Triangular Frequency

oscillator block temperature stability

[OSC]

Frequency

temperature stability

∆f/fdt

∆f/fdt

24 Ta = −10 °C to +85 °C  5*1  %

24 Ta = −30 °C to +85 °C  10*1  %

*1 : Standard design value

(Continued)

9

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