MB3889 Datasheet, PDF (8/35 Pages) Fujitsu Component Limited. – 2-Channel DC/DC Converter IC with Overcurrent Protection Symmetrical-Phase Type

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