MB3800 datasheet(10/20 Pages) FUJITSU

Part #	MB3800

Description	Switching Regulator Controller (Low Voltage)

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Manufacturer	FUJITSU [Fujitsu Component Limited.]

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

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MB3800

10

(Continued)

Oscillation frequency f OSC (Hz)

Maximum duty cycle vs. Oscillation frequency

0

10 k

100

40

60

20

100 k

1 M

80

0

0.4

0.8

1.2

1.6

2.0 t(

µs)

–50

0

50

0

2

4

6

(V)

(mA)

V OUT

I OUT

2 V

10 mV

200 ns

V CC = 2 V

C T = 270 pF

R T = 1.0 k

Ω

18 k

Ω

2 k

Ω

10

µF

+

I OUT

(5 V)

390

Ω

V OUT

22

µH

V CC

MB3800

5

4

–IN

Output pin voltage and current waveforms

(reference data)

Note: The OFF delay time of V OUT depends on the

characteristics of the external transistor.

Measurement circuit diagram

V CC = 2 V

C T = 270 pF

Ta = +25

°C

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