BD9639MWV_16 Datasheet, PDF (12/26 Pages) Rohm – Switching Regulator ICs

BD9639MWV
(8) CH4
(a) Function
Synchronous rectification cross converter with built-in power MOS output stage.
The output voltage is fixed at 3.25V.
OUT4
OUT4
FB4
USW4
PGND4
VBAT4
Buck-Boost
PWMCOMP
PRE
DRIVER
DSW4
0.4[V]
SAW
MAX.
DUTY
DPG4
OUT4
C41
VBAT
L41
C42
P41
(b) Recommended External Components
Parts name Value
Maker
C41
22[µF] Taiyo Yuden
C42
10[µF] Taiyo Yuden
L41
3.3[µH] Taiyo Yuden
P41
-
ROHM
(c) Start-up Sequence
2.5[V]to 5.5[V]
VBAT 2
VBAT 4
Part number
JMK212BJ226MG
JMK212BJ106KG
NR4018T3R3M
RW1A20ZP
H input voltage
XSHDN1
XSHDN 24
0[V]
H input voltage
OUT2
0[V]
OUT4
0[V]
UP side
PMOS
Control signal
5.00[ms]
70 [%]
1.05[V] to1.80[V]
3.25[V]
Soft start period
3.00[ms]
UP side PMOS ON or Switching
Discharge
Discharge
(d) DPG4
The DPG4 output terminal is a gating signal to an external PMOS inserted between VBAT4 and DSW4.
If the VVBAT voltage becomes lower than 2.85[V], DPG4 becomes Low and an external PMOS turns ON.
The over-current can still electrify even if the voltage descend.
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TSZ22111・15・001
12/22
TSZ02201-0313AA400630-1-2
09.Feb.2016 Rev.001