BD9855MWV Datasheet, PDF (3/5 Pages) Rohm – Silicon Monolithic Integrated Circuit

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