BD9639MWV_16 Datasheet, PDF (11/26 Pages) Rohm – Switching Regulator ICs

BD9639MWV
(7) CH3
(a) Function
Synchronous rectification cross converter with built-in power MOS output stage.
Output voltage ranges from 1.80[V] to 2.80[V].
OUT3
R31
C33
R32
FB3
Buck-Boost
PWMCOMP
PRE
DRIVER
OUT3
USW3
PGND3
VBAT3
DSW3
0.4[V]
SAW
MAX.
DUTY
DPG3
OUT3
C31
VBAT
L31
C32
P31
(b) Recommended External Components
Parts
Name
Value
Maker
Part Number
R31
Refer to right
table
-
-
R32
Refer to right
table
-
-
C31
22[µF]
Taiyo Yuden JMK212BJ226MG
C32
10[µF]
Taiyo Yuden JMK212BJ106KG
C33
100[pF]
Taiyo Yuden UMK105CH101JV
L31
4.7[µH]
Taiyo Yuden NR3015T4R7M
P31
-
ROHM
RW1A020ZP
(c) Start-up Sequence
2.5[V] to5.5[V]
OUT3
Set external
R31
R32
1.80[V]
2.80[V]
100[kΩ]
100[kΩ]
27[kΩ] + 1.6[kΩ] 12[kΩ] + 4.7[kΩ]
VBAT3
H input voltage
XSHDN 1
XSHDN24
XSHDN3 0[V]
OUT3 0[V]
H input voltage
1.80[V] to 2.80[V]
Discharge
Soft start period
2.00[ms]
(Note) When VOUT=1.8[V], if OUT3・USW3 are not used (These terminals are only for Buck condition),
Discharge function is not activated.
(d) DPG3
The DPG3 output terminal is a gating signal to an external PMOS inserted between VBAT3 and DSW3.
If the VVBAT voltage becomes lower than 2.85[V], DPG3 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
11/22
TSZ02201-0313AA400630-1-2
09.Feb.2016 Rev.001