BD9528AMUV Datasheet, PDF (25/30 Pages) Rohm – High Performance Regulators for PCs Main Power Supply for Notebook PCs(With Built-in Linear Regulator)

BD9528AMUV
Technical Note
●Handling method of unused pin during using only DC/DC 1ch
If using only 1ch DC/DC and 2ch pin is set to be off at all times, please manage the unused pin as diagram below.
PIN No,
1
2
3
4
5
6
7
8
10
11
31
PIN name
SW2
HG2
BOOT2
EN2
PGOOD2
SS2
Vo2
ILIM2
FS2
FB2
LG2
Management
GND
Open
Open
GND
GND
GND
GND
GND
GND
GND
Open
VIN
CTL
REG1
EN1
VIN
12V _R1
CTL _C1
EN1
REG1
5V
C2
REG2
3.3V
C3
C4
C5
R5
R7
MCTL1
MCTL2
BD9528AMUV
30 _VIN
9 _CTL
BOOT1 ^{22 R9}
HG1 ^{23 R10}
C7
21 _EN1
SW1 ²⁴
4 _EN2
29 _REG1
28 _REG2
LG1 ^{26 R11}
PGND1 ²⁵
FB1 ¹⁴
12 _REF
Vo1 ²⁷
VIN VIN
C9
C10
Q2
SW1
L1
D1
R17
Q1
R18
19 _SS1
6 SS2
17 _ILIM1
8 _ILIM2
15 _FS1
10 _FS2
18 _MCTL1
BOOT2 ³
HG2 ²
SW2 ¹
LG2
PGND2 ³²
FB2 ¹¹
Vo2 ⁷
PGOOD1 ²⁰
REG1 PGOOD1
R15
PGOOD2 ⁵
16
MCTL2
AGND
13
VO1
C14
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25/29
2011.11 - Rev.A