MB3871 Datasheet, PDF (9/25 Pages) Fujitsu Component Limited. – Mobile Pentium II DC/DC Converter IC

MB3871
Parameter
Symbol
Pin
no.
Condition
(Ta = +25°C, VCC = 5 V)
Value
Unit
Min. Typ. Max.
PWM comparator
VTL
blocks (PWM
Threshold voltage
Comp.1, 2)
VTH
Dead time control
block (DTC)
Maximum duty cycle
Dtr
8, 11 Duty cycle = 0%
8, 11 Duty cycle = Dtr
8 RT = 130 kΩ
1.2 1.3 — V
— 1.86 2.0 V
85 90 95 %
VOH1
Output voltage
(main side)
VOL1
Output blocks
(Drive1, 2)
Output voltage
VOH2
(synchronized
rectifier side)
VOL2
Control block
(CTL)
Diode voltage
CTL input voltage
Input current
VDIODE
VIH
VIL
ICTL
PWRGOOD
comparator
protection block
(PWRGD)
Threshold voltage
Hysteresis voltage
Output leak current
Output voltage
Discharge control
comparator (CS Threshold voltage
Comp.)
VTLOW
VTHIGH
VH
ILEAK
VOL
VTH
OUT1 = –100 mA,
8 VB = 5 V, CB = 20 V, CB – 2.5 CB – 1.5 —
V
VS = 15 V
OUT1 = 100 mA,
8 VB = 5 V, CB = 20 V,
VS = 15 V
— VS + 1.1 VS + 1.4 V
11
OUT2 = –100 mA,
VB = 5 V
VB – 2.5 VB – 1.5 —
V
11
OUT2 = 100 mA,
VB = 5 V
— 1.1 1.4 V
13 IDIODE = 10 mA
— 1.0 1.1 V
24 IC operating mode
2.0 — 18 V
24 IC standby mode
0
— 1.0 V
19 CTL = 5 V
— 100 160 µA
21
VD3 to VD0 setting,
VSENSE =
0.88 0.90 0.92
× VD × VD × VD
V
21
VD3 to VD0 setting,
VSENSE =
1.08 1.10 1.12
× VD × VD × VD
V
21
—
3 30 50 mV
21 PWRGOOD = 5 V
— — 40 µA
21 PWRGOOD = 1 mA — 0.06 0.4 V
24 CS =
— 0.05 0.07 V
VIH
Discharge control _{ENB input voltage}
ON/OFF block
VIL
(CTL LOGIC)
Input current
IENB
24 Discharge control ON 2.0 — 18 V
24
Discharge control
OFF
0
— 1.0 V
7 ENB = 0 V
–1.0 –0.05 — µA
(Continued)
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