MB39C308 Datasheet, PDF (28/60 Pages) Fujitsu Component Limited. – 6ch DC/DC Converter IC for LPIA Platform VR

MB39C308
3. PIN CONNECTION WHEN NOT USING CH4, BUT USING CH3
When CH4 is not used but CH3 is used, connect the PVDD4 pins to VB pin through around 5 kΩ resistor, connect
the PG4 pin to Analog ground (AGND), connect 0.1 μF capacitor between CB4 and LX4 pins and connect the
PGND4 pin to Power ground, connect FSEL4 and FB4 pins to VREF pin.
• CH4 is not used, but CH3 is used
VREF
Control signal : “H”
FSEL4
FB4
CTL34
PG4
PVDD4
CB4
LX4
PGND4
VB
around 5 kΩ
0.1 μF
Note : Both CH3 and CH4 become active when CTL34 is on. Connect the pins like shown up above when CH4 is
not used but CH3 is used. PVDD4 must not be open.
4. PIN CONNECTION WHEN NOT USING CH5
When CH5 is not used, connect the PVDD5 pins to power supply, connect the PG5, CTL5 and FB5 pins to
Analog ground (AGND), leave CB5 and LX5 pins open and connect the PGND5 pin to Power ground.
• CH5 is not used
PG5
CTL5
FB5
PVDD5
CB5
LX5
PGND5
Power supply
“OPEN”
“OPEN”
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DS04-27261-6E