BD9634GU Datasheet, PDF (8/30 Pages) Rohm – Switching Regulator ICs

BD9634GU
【CH1】
・Function
Selectable PWM/PFM boost DC/DC converter.
Output voltage is ranges from 3.7[V] to 5.5[V] (TYP) at PFM, 4.1[V] to 5.5[V] (TYP) at PWM.
Low voltage operation starts up from 2.5[V] and also provides supply voltage to VREF circuit.
VOUT1
R1
C3 _FB1
R2
0.4[V]
PWM/PFM
PFM
PWM
MAX.
DUTY
Startup Circuit
PRE
DRIVER
PREV1
D1
VOUT1
C1
OUT1
M1
PGND13
VBAT
R3
C1
VBAT ^L1
VBAT
C2
VOUT1
Setting External Components
・Recommended External Components
Parts Name
Value
Maker
Part Number
R1
R2
R3
C1
C2
C3
C4
L1
M1 ^(Note)
D1
Refer to the right table
Refer to the right table
10[Ω]
22[μF] x 2
10[μF]
Refer to
the right table
1[μF]
1.0[μH]
-
-
-
-
-
Taiyo Yuden
Taiyo Yuden
Taiyo Yuden
Taiyo Yuden
TOKO
ROHM
ROHM
-
-
-
JMK212BJ226MG
JMK212BJ106KG
TMK063BJ101KP
/TMK063BJ151KP
JMK105BJ105KV
A997AS-1R0N
RTF015N03/RTR040N03
RB060M-30
(Note) It depends on output load current
・ Start-up Sequence
VBAT
0[V]
XSHDN1
0[V]
VOUT1
0[V]
2.5[V] to 5.5[V]
VBAT[V]
≈VBAT[V]
When VBAT is 3.2[V] or less
3.7[V] to 5.5[V]
ON_delay SOFT
Soft start time
VOUT1
Setting
external
R1
R2
C3
R1
R2
C3
PFM
3.7[V]
620[KΩ]+24[KΩ]
56[KΩ]+22[KΩ]
100[pF]
510[KΩ]+22[KΩ]
56[KΩ]+7.5[KΩ]+1[KΩ]
150[pF]
PFM/PWM
4.2[V]
5.0[V]
620[KΩ]+24[KΩ]
56[KΩ]
100[pF]
510[KΩ]+22[KΩ]
56[KΩ]
150[pF]
VOUT1  ^{R1 R2} 0.4[V]
R2
Discharge by load
・PWM/PFM
PWM/PFM
0[V]
H input voltage
VOUT1
3.7[V] to 5.5[V]
PFM operation
（Load 10mA or less)
PWM operation
Select PWM/PFM with light load (10mA or less).
PFM operation
（Load 10mA or less)
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TSZ22111・15・001
8/26
TSZ02201-0313AA400620-1-2
26.Apr.2016 Rev.001