MB3889 데이터 시트보기 (PDF) - Fujitsu

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MB3889

2-Channel DC/DC Converter IC with Overcurrent Protection Symmetrical-Phase Type

Fujitsu 

MB3889

s ELECTRICAL CHARACTERISTICS

(VCC = 12 V, VB = 0 mA, VREF = 0 mA, Ta = +25 °C)

Parameter

Pin

Symbol No.

Conditions

Value

Unit

Min

Typ

Max

VREF

8 Ta = + 25 °C

3.465 3.500 3.535 V

1. Reference

Output voltage ∆VREF/

VREF

8

Ta = 0 °C to + 85 °C



Voltage

Input stability Line 8 VCC = 5.5 V to 18 V



Block [REF] Load stability Load 8 VREF = 0 mA to − 1 mA



0.5*



%

1

10 mV

3

10 mV

Short-circuit

output current

IOS

8 VREF = 0 V

− 40

− 20

− 10 mA

2. Bias Voltage

Block [VB]

Output voltage

VB

22



5.0

5.1

5.2

V

3. Triangular

Waveform

Oscillator

Block [OSC]

Oscillation

frequency

Frequency/

temperature

variation

fOSC 17, 29 RT = 47 kΩ

∆fOSC/

fOSC

17, 29 Ta = 0 °C to + 85 °C

270

300

330 kHz



1*



%

4. Undervolt- Threshold

age (VCC)

voltage

Lockout Circuit Hysteresis

Block [UVLO] width

VTH

8 VREF =

VH

8



2.6

2.8

3.0

V



0.2*



V

5. Short-circuit

Protection

Circuit Block

[SCP]

Threshold

voltage

Input source

current

Reset voltage

VTH

ICSCP

VRST

11



11



8 VREF =

0.65

0.70

0.75 V

− 14

− 10

1.7

2.1

− 6 µA

2.5

V

6. Overcurrent

Protection

Circuit Block

[OCP]

ILIM terminal

input current

Offset voltage

ILIM 23, 25 RT = 47 kΩ

VIO 23, 25



106

118

130 µA



1*

 mV

7. Overvoltage

Protection

Circuit Block

[OVP]

Threshold

voltage

Input bias

current

VTH 1, 15 −INE =

IB 1, 15 −INE = 0 V

1.35

−730

1.38

−110

1.41 V

 nA

8.Protection

Status

Output Cirsuit

Block

[PWRGOOD]

Output leakage

current

ILEAK

Output “L” level

voltage

VOL

9. Soft-start

Circuit Block

[CS]

Charge current ICS

*: Standard design value

12 PWRGOOD = 5 V

12 PWRGOOD = 1 mA

3, 13







40 µA



0.1

0.4

V

− 4.2

− 3.0

− 1.8 µA

(Continued)

8

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