bd9855mwv ROHM Co. Ltd., bd9855mwv Datasheet - Page 3

• Manufacturer Part Number: bd9855mwv
• Description: 4 Channel Switching Regulator Control System For Dsc
• Manufacturer: ROHM Co. Ltd.

VREF
○ Package
○ Block Diagram
SCP
FB1
INV1
SS1
FB2
INV2
SS2
FB3
INV3
SS3
FB4
INV4
NON4
SS4
VREF
CTL1 CTL2 CTL3 CTL4
SCP TIMER
LATCH
CH_CTL
ERRORAMP4
monitor
ERRORAMP1
ERRORAMP2
ERRORAMP3
SS
+
+
+
+
+
+
-
+
-
-
-
- -
- -
+
RTSS
latch
BD9855
RT
OSC
SEL
PWMCOMP4
Fig.2
+
-
PROTECTION
SYNC
OSC
SYNC
(Current mode)
(Current mode)
Step Down
Step Down
converter
TSD
VREGA
UVLO
cross
CH3
CH1
CH2
PVCC4
BST1
BST2
VREGA
VREG
VREG
GND
latch
BST1
BST2
Lot No.
BST1
OUT3
Vo3
PVCC4
Lx31
PGND3
Lx32
PGND4
Lx1
BST2
OUT4
PVCC1
PGND12
VCC
PG
PVCC2
Lx2
Plastic Mold
(UNIT：mm)
REV. C
Fig.1
○ Pin Description
Fig.3
3/4