MB3789 datasheet(10/28 Pages) FUJITSU

Part #	MB3789

Description	Switching Regulator Controller (Supporting External Synchronization)

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Manufacturer	FUJITSU [Fujitsu Component Limited.]

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

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10

MB3789

s TYPICAL CHARACTERISTICS

(Continued)

2.4

2.0

1.6

1.2

0.8

0.4

0

4

8

12

16

20

VCC2 = 6 V

Ta = +25

°C

Power supply voltage VCC1 (V)

Power supply voltage VCC2 (V)

Ambient temperature Ta (

°C)

Timing resistance RT (

Ω)

Timing capacitance CT (pF)

Output power supply current vs.

power supply voltage characteristics

Reference voltage vs.

ambient temperature characteristics

Sawtooth wave frequency vs.

timing resistance characteristics

(With CT/RT oscillation)

Sawtooth waveform maximum amplitude voltage vs.

timing capacitance characteristics

(With CT/RT oscillation)

Power supply current vs.

power supply voltage characteristics

Reference voltage vs.

power supply voltage characteristics

500

400

300

200

100

0

4

8

12

16

20

VCC1 = 5 V

Ta = +25

°C

5.0

4.0

3.0

2.0

1.0

0

4

8

12

16

20

VCC2 = 6 V

IOR = 0

µA

Ta = +25

°C

2.56

2.54

2.52

2.50

2.48

2.46

2.44

−40

0

20

40

80

−20

60

100

VCC1 = 5 V

VCC2 = 6 V

IOR = 0

µA

1.4

1.2

1.0

0.8

0.6

0.4

0.2

0

10

5

× 10 10

22

3

5

× 10 10

34

5

× 104

2 k

5 k

10 k

50 k 100 k

500 k 1 M

500 k

100 k

50 k

10 k

5 k

1 k

500

100

VCC1 = 5 V

CT = 470 pF

CT = 1500 pF

CT = 4700 pF

CT = 6800 pF

VCC2 = 6 V

SYNC = GND

Ta = +25

°C

SYNC = GND

VCC1 = 5 V

VCC2 = 6 V

RT = 39 k

Ω

Ta = +25

°C

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