BD9634GU Datasheet, PDF (16/30 Pages) Rohm – Switching Regulator ICs

BD9634GU
【CH8】
・Function
Reverse DC/DC Converter.
Output voltage ranges from -7.5[V] to -6.0[V] (TYP).
VOUT8
R1
C3 _FB8
R2
1.0[V]
(EREF8)
VREF8
CH8 REF
MAX.
DUTY
SAW
PRE
DRIVER
MAX.
DUTY
VBAT8
OUT8
PGND78
VOUT8
Discharge
VBAT
C2
US1
L1
VOUT8
C1
・Recommended External
Parts name
Value
R1
Refer to the right table
R2
Refer to the right table
C1
10[μF] x 2
C2
1[μF]
C3
100[pF]
L1
2.2[μH]
US1
-
Maker
Part number
-
-
Taiyo Yuden
Taiyo Yuden
Taiyo Yuden
sumida
ROHM
-
-
LMK212BJ106KG
JMK105BJ105KV
TMK063CH101JP
CDRH2D14NP-2R2NC
QS5U21
Setting
external
VOUT8
R1
R2
-7.5[V]
680[KΩ]
120[KΩ]
-6[V]
560[KΩ]
120[KΩ]
VOUT8   ^R1 VREF8  ^{R1 R2} EREF8
R2
R2
Output voltage accuracy is calculated by the above formula.
・Start-up Sequence
＜CONT78=L＞
2.5[V] to 5.5[V]
VBAT8
H input voltage
PWM/PFM _0[V]
2.5[V]
0[V]
VREF8
XSHDN78
0[V]
H input voltage
VOUT7 0[V]
VOUT8 ^0[V]
≈VBAT[V]
70[%] ^{12[V] to 14[V]}
ON_delay SOFT
Soft start period
8.0[ms]
Discharge by load
Soft start period
6.0[ms]
-7.5[V] to -6[V]
Discharge
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TSZ22111・15・001
16/26
TSZ02201-0313AA400620-1-2
26.Apr.2016 Rev.001