MB39C308 Datasheet, PDF (19/60 Pages) Fujitsu Component Limited. – 6ch DC/DC Converter IC for LPIA Platform VR

MB39C308
■ CHANNEL CONTROL FUNCTION
The each channel is turned on and off depending on the voltage levels at the CTL1 pin, CTL2 pin, CTL34 pin,
CTL5 pin and CTL6 pin.
• Channel On/Off Setting Conditions
CTL1 CTL2 CTL34 CTL5 CTL6
L
L
L
L
L
H
L
L
L
L
L
H
L
L
L
L
L
H
L
L
L
L
L
H
L
L
L
L
L
H
H
H
H
H
H
CH1
OFF
ON
OFF
OFF
OFF
OFF
ON
CH2
OFF
OFF
ON
OFF
OFF
OFF
ON
CH3
OFF
OFF
OFF
ON
OFF
OFF
ON
CH4
OFF
OFF
OFF
ON
OFF
OFF
ON
CH5
OFF
OFF
OFF
OFF
ON
OFF
ON
CH6
OFF
OFF
OFF
OFF
OFF
ON
ON
■ POWER GOOD FUNCTION
The Power Good function is shown in the following figure. The ALLPG pin and the PGx pins are connected to
the open drain of the NMOS, and are used by connecting the resistor. When the CTLx pin is turned on, and the
output voltage becomes within 7% of the preset voltage, the PGx pin is changed from “L” to “H”. PGx = “H”
means the status of Power Good. When the change of the output voltage exceeds 10% of the preset voltage,
the PGx pin becomes “L”. And when the output voltage becomes within 7% of the preset voltage, the PGx pin
becomes “H”. Moreover, when all of the channels from CH3 to CH6 are the Power Good, the ALLPG pin becomes
“H”.
Soft Start
Operation
Soft Stop
CTLx
PGx
Preset Output Voltage
Vox
+10%
-7%
+7%
-10%
-7%
PGx
DS04-27261-6E
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