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MB3889PFT 데이터 시트보기 (PDF) - Fujitsu
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MB3889PFT
2-Channel DC/DC Converter IC with Overcurrent Protection Symmetrical-Phase Type
Fujitsu
MB3889PFT Datasheet PDF : 35 Pages
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MB3889
s
BLOCK DIAGRAM
FB1 2
−
INE1
1
L priority
CS1
3
VREF
3
µ
A
100
k
Ω
Buff
CTL1
9
Open : CH1 ON
L : CH1 OFF
CTL1
=
H
VTH
=
1.4 V
6 k
Ω
Error
−
Amp1
++
1.23 V
OVP
+
Comp.1
−
1.38 V
VCC
24
VB Reg.
L priority
PWM
++
Comp.1
−
CH1
Drv
1-1
Max Duty 81%
Dtr
±
6%
Drv
2-1
Current
Protection
Logic
H: at OCP
OCP
Comp.1
118
µ
A
5.1 V
22 VB
30 CB1
29 OUT1-1
28 VS1
27 OUT2-1
26 PGND1
25 ILIM1
FB2 14
−
INE2
CS2
L priority
15
13
VREF
3
µ
A
Error
Amp2
−
++
1.23 V
OVP
+
Comp.2
100
k
Ω
Buff
CTL2
10
Open : CH2 ON
L : CH2 OFF
CTL2
=
H
VTH
=
1.4 V
6 k
Ω
−
1.38 V
L priority
PWM
Comp.2
++
−
Max Duty 81%
Dtr
±
6%
CH2
Drv
1-2
Drv
2-2
Current
Protection
Logic
H: at OCP
OCP
Comp.2
118
µ
A
16 CB2
17 OUT1-2
18 VS2
19 OUT2-2
20 PGND2
23 ILIM2
H: priority
SCP Comp.
H: at OVP
3.1 V
CTL
CTL1
CTL2
Latch1
SQ
R
H: at OVP
H: at OVP
H: at OCP
H: at SCP
10
µ
A
CSCP 11
CTL
CTL1
CTL2
VREF
SR
Latch
Latch2
UVLO
3.0 V
CT1
1.8 V
3.0 V
CT2
1.8 V
OSC
45 pF
5
RT
H: at
UVLO release
L: at protection
operation
PWRGOOD
12
Protection
control
signal
to Error amp reference
bias
1.23 V
VCC
VREF
Power
VR1 ON/OFF
CTL
3.5 V
8
VREF
7
SGND
4 N.C.
21 N.C.
6 CTL
H : ON (Power On)
L : OFF (Standby mode)
VTH
=
1.4 V
5
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