MB3800 datasheet(3/4 Pages) FCI

Part #	MB3800

Description	Wide supply voltage operating range: 1.8 to 15 V

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Manufacturer	FCI [First Components International]

Direct Link	http://www.cotra.com.tw/

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3 / 4 page

TL431 Programmable Precision Reference

MB3800 Switching Regulator Controller

Preliminary

ELECTRICAL CHARACTERISTICS

Value

Parameter

Symbol

Condition

Min

Typ

Max

Unit

Reset Voltage

VR

-

0.9

Circuit to prevent

malfunction at low

input voltage

(U.V.L.O.)

Threshold

Voltage

VTH

-

1.1

1.3

1.5

V

Charging Current

ICS

VSCP=0V

-1.5

-1.0

-0.7

μA

Soft start

Voltage at soft

start completion

VtS

-

0.7

0.8

0.9

V

Charging current

ICPC

VSCP=0V

-1.5

-1.0

-0.7

μA

Short circuit

detection (S.C.R)

Threshold

Voltage

VtPC

-

0.7

0.8

0.9

V

Oscillation

frequency

fOSC

RT=3.0KΩCT=270pF

400

500

600

KHz

Frequency input

Stability

fdV

VCC=2V to 15V

-

2

10

%

Sawtooth wave

oscillator (OSC)

Frequency

variation with

temperature

fdT

Ta=-30℃~+85℃

-

5

-

%

Input Threshold

Voltage

VT

VFB=450mV

VT

Input stability

VTdV

VCC=2V ~15V

480

500

520

mV

VT variation with

temperature

VTdT

Ta=-30℃~+85℃

-

5

20

mV

Input bias current

IB

VIN=0V

-

1

-

%

Voltage Gain

AV

-

70

100

145

V/V

Frequency

bandwidth

BW

AV=0dB

-

6

-

MHz

VOM

+

0.78

0.87

-

V

Maximum output

voltage range

VOM

-

0.05

0.2

V

Output source

current

IOM

+

-

-40

-24

μA

Error amplifier

Output sink

current

IOM

-

VFB=0.45V

24

40

-

μA

Idle period

adjustment section

Maximum duty

cycle

tDUTY

RT=3.0KΩ

CT=270pF,VFB=0.8V

65

75

85

%

VOH1

RB

=390Ω,IO=-15mA

1.0

1.2

-

V

VOH2

RB

=750Ω,

VCC=-15mA,IO=-10mA

0.8

1.0

-

V

VOL1

RB

=390Ω,IO=15mA

-

0.1

0.2

V

Output voltage

VOL2

RB

=750Ω,

VCC=-15mA,IO=10mA

-

0.1

0.2

V

Output source

current

IO

+

RB

=390Ω,VO=0.9V

-

-30

-20

mA

Output sink

current

IO

-

RB

=390Ω,VO=0.3V

30

60

-

mA

Output section

Pull down

resistance

RO

-

20

30

40

kΩ

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