BD95242MUV_10 Datasheet, PDF (17/21 Pages) Rohm – 2ch Switching Regulator for Desktop PC

Technical Note
●Handling method of unused pin during using only 1ch DC/DC.
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,
PIN Name
Management
1
SW2
GND
2
HG2
OPEN
3
BOOT2
GND
4
EN2
GND
5
PGOOD2
GND
6
SS2
GND
8
REF2
GND
9
Is+2
GND
10
FB2
GND
11
FS2
GND
31
LG2
OPEN
VIN
REG1
VIN
12V _R1
CTL _C1
CTL
R2
EN1
EN1
R3
REG1
5V
C2
REG2
3.3V
C3
Vo1
EXTVCC
R5
REG2
C4
BD95242MUV
REG1
VIN VIN
30 _VIN
18 _CTL
21 _EN1
D3
BOOT1 ^{22 R50}
HG1 ^{23 R49}
C24
R47
SW1 ²⁴
C27
Q2
4 _EN2
29 _REG1
LG1 ^{26 R46}
PGND1 ²⁵
D1
Q1
28 _REG2
27 _EXTVCC
Is+1 ¹⁶
FB1 ¹⁵
R40
C19
R39
R6
R7
C5
17 _REF1
VIN
REG2
R58
R16 ^FS1
R17
8 _REF2
19 _SS1
C7
6 SS2
C18 ^{14 FS1}
MCTL
C28
11 _FS2
12 _MCTL
7 _DGND
13
AGND
BOOT2 ³
HG2 ²
SW2 ¹
LG2 ³¹
PGND2 ³²
Is+2 ⁹
FB2 ¹⁰
REG1 PGOOD1
R21
R20
PGOOD1 ²⁰
PGOOD2 ⁵
C25
C26
SW1
L1
R45 C34
C23
R10
VO1
R51
R48
R43
R44
R60
VO1
C21 C22 C33 C32 C20
TPQ6
R56
R55
R57
Q5
●Charge pump Circuit Example.
During SLLM, if Vo1=5V and charge pump output is set 10V～15V, circuit example is below.
LG1
2.2μF
Vo1
2.2μF
2.2μF
Charge pump
2.2μF
510kΩ
470kΩ
MCTL pin
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17/20
2010.03 - Rev.C