Large Current External FET Controller Type Switching Regulators
Step-down,High-efficiency
Switching Regulators (Controller type)
BD9040FV,BD9045FV
No.09028EAT03
●Over
View
BD9040FV(output type of 1ch) and BD9045FV(output type of 2ch) are switching controllers that can be used within the wide
range of the input.Highly effective can be achieved by the synchronous rectification method and it is possible to contribute to
the eco-design of all electronic equipment (energy-saving).
●Feature(BD9040FV，BD
9045FV)
1) Wide input voltage range：4.5V½18V
2) Reference voltage 0.9V±1%
3) The overcurrent of timer latch type, excess voltage, short, and RTO/S protection are built-in
4) The switching frequency is changeable.(200kHz½750kHz)
5) A ceramic capacitor can be used for the output.
●Applications
For thin television, DVD½HDD recorder , STB, amusement and others.
●Absolute
maximum rating
(Ta=25℃)
Parameter
Power-supply voltage
EN input voltage
SW voltage
Voltage between BOOT-SW
Permissible loss 1
Permissible loss 2
Range of operating temperature
Storage temperature range
Junction temperature
**
***
Ta=25℃ or more is reduced with 6.5mW/℃.
Ta=25℃ or more is reduced with 7.5mW/℃.
Symbol
Vcc
V
EN
V
SW
V
BOOT
Pd1
Pd2
Topr
Tstg
Tjmax
Rating
20
20
Vcc
6
0.81** (BD9040FV)
0.94*** (BD9045FV)
-40½+85
-55½+150
150
Unit
V
V
V
V
W
W
℃
℃
℃
●Operation
condition
(Ta=-40℃½+85℃)
Parameter
Power supply voltage***
Timing resistance
Frequency of oscillator
***
○
Symbol
Vcc
RT
Fosc
Min
4.5
39
200
Limit
Typ
12
－
－
Max
18
130
750
Unit
V
kΩ
kHz
Please be short-circuited to use VREG5 and VCC when the
Vcc
is 6V or less.
The radiation design is not done.
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© 2009 ROHM Co., Ltd. All rights reserved.
1/18
2009.05 - Rev.A
BD9040FV, BD9045FV
●Electric
characteristics
(Unless otherwise specified Ta=25℃ V
CC
=12V EN=5V) (BD9040FV)
Parameter
VCC Current of bias
Standby current
［VREG5½
Standard voltage output voltage
Technical Note
Symbol
ICC
ISTB
Limit
Min
-
-
Typ
3
430
Max
6
860
Unit
mA
µA
V
EN
=0V
Condition
VREG5
VREG5_L
5
-
5.5
20
6
50
V
mV
IV
REG5
=0 to 6mA
Load stability level
［VREG3
part]
Standard voltage
Load stability level
VREG3
VREG3_L
2.85
-
3.0
10
3.15
20
V
mV
IV
REG3
=0 to 1mA
［prevention
part for mis-operation of low input½
VREG5 Threshold voltage
VREG3 Threshold voltage
［Oscillator½
Oscillation frequency
［Error
amplifier½
VO input bias current
Source current
Sink current
Return standard voltage
Output short detection voltage
Hysteresis voltage
［Soft
start part½
Charge current
Discharge current 1
Discharge current 2
Maximum voltage
Standby current
ISS
IDIS
IDIS2
Vss_MAX
Vss_STB
-14
0.6
2.35
1.75
-
-10
1.7
3.3
1.95
-
-6
5
4.62
2.15
0.3
V
V
µA
mA
Vss=1V
Vss=1V
Vss=1V, VEN_SS=0V
Ivo+
Isource
Isink
VOB
Vosh
ΔVosh
-
-12
0.75
0.891
0.37
22
-
-6.5
1.5
0.900
0.45
45
1
-2
5
0.909
0.53
90
µA
mA
mA
V
V
mV
V
FB
=1.1V
V
FB
=0.7V
FB-COMP Short
V
FB
:Sweep down
V
FB
:Sweep up
FOSC
240
300
360
kHz
RT=91 kΩ
VREG5_UVLO
VREG3_UVLO
3.4
2.4
3.8
2.5
4.2
2.6
V
V
V
REG5
:Sweep down
V
REG3
:Sweep down
［overcurrent
protection Division½
CL inflow current
［Overvoltage
protection Division½
Detection voltage
［Timer
latch circuit Division½
Source current
Threshold voltage
OFF Sink current
［Each
ch control part½
EN
pull-up resistor
R
EN
R
EN_SS
150
150
300
300
450
450
kΩ
kΩ
ITM
Vth_TM
IOFFS
-14
0.9
0.6
-10
1
1.7
-6
1.1
5
µA
V
mA
V
TM
=0.5V
V
TM
=1V
Vovp
1.06
1.1
1.14
V
Iswin
9
10
11
µA
V
CL
=Vcc-0.2V
EN_SS pull-up resistor
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© 2009 ROHM Co., Ltd. All rights reserved.
2/18
2009.05 - Rev.A
BD9040FV, BD9045FV
●Reference
data
(Unless otherwise specified Ta=25℃)
100
90
80
EFFICIENCY[%]
EFFICIENCY[%]
70
60
50
40
30
20
10
0
0
1
2
OUTPUT CURRENT
：
Io[A]
3
V
IN
=12V
1.8V
1.2V
2.6V
3.3V
5.0V
100
90
80
70
60
50
40
30
20
10
0
6
9
12
15
INPUT VOLTAGE
：
V
IN
[V]
18
Io=2A
INPUT CURRENT
：
I
IN
[mA]
3.3V
5.0V
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
0
2
Technical Note
BD9045FV
BD9040FV
4 6 8 10 12 14 16 18 20
OUTPUT VOLTAGE
：
Vo[V]
Fig.1 Efficiency 1
Fig.2 Efficiency 2
Fig.3 Circuit current
0.9
950
REFERENCE VOLTAGE
：
VOB[V]
OSILATING FREQUENCY
：
FOSC[kHz]
330
320
310
300
290
280
270
-40
-15
10
35
60
85
AMBIENT TEMPERATURE
：
Ta[℃]
STANDBY CURRENT
：
ISTB[uA]
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
0
2
4
6
8
10 12 14 16 18 20
INPUT VOLTAGE
：
V
IN
[V]
BD9040FV
BD9045FV
940
930
920
910
900
890
880
870
860
850
-40
-15
10
35
60
85
AMBIENT TEMPERATURE
：
Ta[℃]
Fig.4 Standby current
Fig.5 Reference voltage
temperature characteristic
4.0
Fig.6 Frequency
temperature characteristic
3.5
OUTPUT
VOLTAGE
：
Vo[V]
3.0
2.5
2.0
1.5
1.0
0.5
0.0
0
1
2
3
4
5
INPUT VOLTAGE
：
V
EN
[V]
85
℃
25
℃
-40
℃
7
OUTPUT CURRENT
：
Io[A]
OUTPUT VOLTAGE
：
Vo[V]
6
5
4
3
2
1
0
-20
BD9045FV
R
CL
=12kΩ
Use SP8K2
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
Latch OFF
BD9040FV
R
CL
=10kΩ
Use SP8K2
R
CL
=10kΩ
0
20
40
60
80
0
1
2
3
4
AMBIENT TEMPERATURE
：
Ta[
℃
]
OUTPUT CURRENT
：
Io[A]
Fig.7 Overcurrent protection
temperature characteristic
3.5
OUTPUT
VOLTAGE
：
Vo[V]
3.0
2.5
2.0
1.5
1.0
0.5
0.0
0
1
2
3
4
5
INPUT VOLTAGE
：
V
EN_SS
[V]
85
℃
25
℃
-40
℃
Fig.8 Load regulation
Fig9. EN Threshold voltage
20mV/div
V
OUT
V
OUT
20mV/div
I
OUT
1A/div
1A/div
I
OUT
Fig.10 EN_SS Threshold voltage
Fig.11 Load response 1
Fig.12 Load response 2
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© 2009 ROHM Co., Ltd. All rights reserved.
3/18
2009.05 - Rev.A
BD9040FV, BD9045FV
●Pin
configuration
(BD9040FV)
Technical Note
EN_SS
RT
TM
SS
COMP
FB
EN
N.C.
VREG3
GND
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
CL
BOOT
OUTH
SW
DGND
OUTL
VREG5
N.C.
N.C.
VCC
●Pin
function table
(BD9040FV)
Terminal number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
terminal name
EN_SS
RT
TM
SS
COMP
FB
EN
N.C
VREG3
GND
VCC
N.C
N.C
VREG5
OUTL
DGND
SW
OUTH
BOOT
CL
Function
SS discharge Delay ON/OFF terminal
Oscillation frequency setting terminal
Output OCP and OVP timer latch setting terminal
Soft start time setting terminal
Error amplifier output
Error amplifier input
Output ON/OFF terminal
Unconnected terminal
REG output for standard power supply
GND
Input power supply terminal
Unconnected terminal
Unconnected terminal
REG output for FET drive
drive terminal at low side of FET gate
Source terminal at low side of FET
High side FET source terminal
Terminal of drive at high side in FET gate
OUTH driver power supply terminal
Overcurrent detection setting terminal
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© 2009 ROHM Co., Ltd. All rights reserved.
4/18
2009.05 - Rev.A
BD9040FV, BD9045FV
●Block
diagram
Technical Note
(BD9040FV)
VCC
5.5V Reg
B.G
RT
3.0V Reg
O/S Check
VREG5
VREG3
3.8V
UVLO
TSD
TSD
OSC
UVLO
2.5V
TM
OCP
CL
Set
Reset
DRV
DRV
BOOT
OUTH
SW
VREG5
TSD
UVLO
Slope
Set
Q
Reset
OUTL
OVP
ErrAmp
PWM
UVLO
COMP
DGND
FB
SS
0.9V
Q
Set
EN_SS
COMP
Sequence DET
Reset
0.45V
EN
GND
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© 2009 ROHM Co., Ltd. All rights reserved.
5/18
2009.05 - Rev.A
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