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MB3870 Datasheet(PDF) 9 Page - Fujitsu Component Limited.

Part # MB3870
Description  Pentium II DC/DC Converter IC
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Manufacturer  FUJITSU [Fujitsu Component Limited.]
Direct Link  http://edevice.fujitsu.com/fmd/en/index.html
Logo FUJITSU - Fujitsu Component Limited.

MB3870 Datasheet(HTML) 9 Page - Fujitsu Component Limited.

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9
MB3870
(Ta = +25
°C, VCC = 5 V)
(Continued)
Parameter
Symbol
Pin
no.
Condition
Value
Unit
Min.
Typ.
Max.
PWM comparator
blocks (PWM
Comp.1, 2)
Threshold voltage
VTL
8, 11 Duty cycle = 0%
1.3
V
VTH
8, 11 Duty cycle = Dtr
1.86
2.0
V
Dead time control
block (DTC)
Maximum duty cycle Dtr
8
RT = 130 k
85
90
95
%
Output blocks
(Drive1, 2)
Output voltage
(main side)
VOH
8
OUT1 = –100 mA,
VB = 5 V, CB = 10 V,
VS = 5 V
CB – 2.5
CB – 1.5
—V
VOL
8
OUT1 = 100 mA,
VB = 5 V, CB = 10 V,
VS = 5 V
VS + 1.1
VS + 1.4
V
Output voltage
(synchronized
rectifier side)
VOH
11
OUT2 = –100 mA,
VB = 5 V
VB – 2.5
VB – 1.5
—V
VOL
11
OUT2 = 100 mA,
VB = 5 V
—1.1
1.4
V
Diode voltage
VDIODE
13
IDIODE = 10 mA
1.0
1.1
V
Control block
(CTL)
CTL input voltage
VIH
24
IC operating mode
2.0
18
V
VIL
24
IC standby mode
0
1.0
V
Input current
ICTL
19
CTL = 5 V
100
160
µA
PWRGOOD
comparator
protection block
(PWRGD)
Threshold voltage
VTLOW
21
VD4 to VD0 setting,
VSENSE =
0.88
× VD
0.90
× VD
0.92
× VD
V
VTHIGH
21
VD4 to VD0 setting,
VSENSE =
1.08
× VD
1.10
× VD
1.12
× VD
V
Hysteresis voltage
VH
21
3
30
50
mV
Output leak current
ILEAK
21
PWRGOOD = 5 V
40
µA
Output voltage
VOL
21
PWRGOOD = 1 mA
0.06
0.4
V
Discharge control
comparator (CS
Comp.)
Threshold voltage
VTH
24
CS =
0.05
0.07
V
Discharge control
ON/OFF block
(CTL LOGIC)
ENB input voltage
VIH
24
Discharge control ON
2.0
18
V
VIL
24
Discharge control
OFF
0—
1.0
V
Input current
IENB
7
ENB = 0 V
–1.0
–0.05
µA
1.2


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