Datasheet

BD9540EFV
Technical Note
3/17
www.rohm.com
2009.04 - Rev.B
© 2009 ROHM Co., Ltd. All rights reserved.
●Block Diagram
●Pin Configuration
Thermal
Protection
R
S
Q
TSD
Delay
H
3
Reg
TM
Controlle
r
Block
5VReg
GND
BOOT1
HG1
SW1
LG1
PGND1
1
28
27
26
25
7
Reference
Block
UVLO
EN2
BOOT2
HG2
SW2
LG2
12
14
15
16
17
5VReg
22
23
OVP
OVP
Driver
Circuit
R
S
Q
H
3
Reg
TM
Controller
Block
UVLO
ILIM2
SCP
TSD
Drive
r
Circuit
FB1
5
EN1
3
FB2
10
1.02
FB1
OVP1
0.90
FB2
5VReg
5VReg
VOUT2
EN1/UVLO
TSD/OVP
VOUT1
4
VOUT1
Logic Input
VOUT2
VOUT1
VIN
VOUT2
VIN
11
VIN
VIN
EN1
5VReg
UVLO
ILIM1
SCP
TSD
+
-
REF2×0.7
FB2
+
-
REF1×0.7
FB1
SCP
EN2
5VReg
CTL1
8
CTL2
9
REF1
SW1
OCP
SW2
OCP
DAC
+
-
+
-
24
ILIM1
ILIM2
19
OVP
OVP2
21
5VReg
VCC
VIN
+
18
PGND2
Soft
Star
t
-
+
REF1
SS1
REF2
BG
EN1
SS1
Soft
Start
EN2
SS2
EN2/UVLO
TSD/OVP
+
-
+
REF2
SS2
TEST
20
BD9540EFV
BOOT1 1
3
4
5
6
7
9
10
11
12
13
14
15
16
17
18
19
20
22
23
24
25
26
27
28
VOUT2
EN2
BOOT2
HG1
SW1
LG1
PGND1
ILIM1
V
IN
5VR
eg
ILIM2
PGND2
LG2
SW2
HG2
EN1
VOUT1
FB1
NC
GND
FB2
NC
CTL2
2
NC
TEST
8
21
VCC
CTL1