Datasheet
8V to 35V, 1.5A 1ch
Buck Converter with Integrated FET
BD9703FP BD9703CP-V5
General Description
The BD9703xx is a series of single-channel step-down
switching regulators capable of PWM operation. It has a
built-in P-Channel MOSFET making its efficiency high
at small loads. It has lower power consumption
because it is made under Bi-CMOS process. Its
operating current is only 4mA (Typ) and standby current
is 0µA (Typ).
BD9703T
BD9703T-V5
Key Specifications
Input Voltage Range:
Output Voltage Range:
Output Current:
Switching Frequency:
FET ON-Resistance:
Standby Current:
Operating Temperature Range:
8Vto 35V
1.0V to 32V
1.5A (Max)
300KHz(Typ)
1.0Ω(Typ)
0μA (Typ)
-40°C to +85°C
Features
Built-In P-Channel MOSFET for High Efficiency
Adjustable Output Voltage Via External Resistors
Built-In Over-Current Protection and Thermal
Shutdown Circuits
ON/OFF Control Via STBY Pin
Packages
W(Typ) x D(Typ) x H(Max)
Applications
TVs, Printers, DVD Players, Projectors, Gaming
Devices, PCs, Car Audio/Navigation Systems, ETCs,
Communication Equipment, AV Products, Office
Equipment, Industrial Devices, and more.
TO252-5
6.50mm x 9.50mm x 2.50mm
TO220CP-V5
10.00mm x 20.12mm x 4.60mm
Typical Application Circuit
TO220FP-5
10.00mm x 30.50mm x 4.60mm
TO220FP-5(V5)
10.00mm x 31.50mm x 8.15mm
C
2
+
C
1
1
VCC
OUT
2
D
1
C
4
+
C
3
L
1
5.0V
STBY
5
R
1
: 4kΩ
C
5
INV
4
R
2
: 1kΩ
3
GND
Figure 1. Typical Application Circuit
○Product
structure：Silicon monolithic integrated circuit
.
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© 2014 ROHM Co., Ltd. All rights reserved.
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○This
product has no designed protection against radioactive rays
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BD9703FP BD9703CP-V5
Block Diagram
BD9703T
BD9703T-V5
VCC
1
VREF
PWM COMP
DRIVER
OSC
STBY 5
STBY
CTL
LOGIC
2
TSD
OCP
OUT
Error AMP
INV
4
3
GND
Figure 2. Block Diagram
Pin Configuration
TO252-5
(TOP VIEW)
GND
TO220CP-V5
(TOP VIEW)
TO220FP-5
(TOP VIEW)
TO220FP-5(V5)
(TOP VIEW)
3
GND
1
2
3 4
5
STBY
Pin Description
Pin No.
1
2
3,FIN
(Note 1)
4
5
Pin Name
VCC
OUT
GND
INV
STBY
Function
Input power supply pin
Internal Pch FET drain pin
Ground
Output voltage feedback pin
ON/OFF control pin
(Note 1) FIN is assigned in the case of TO252-5.
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VCC
OUT
GND
INV
STBY
U
VCC
OUT
GND
1
VCC
2
OUT
4
INV
5
STBY
1
2
3 4
5
1
2
3
4
5
INV
U
STBY
VCC
OUT
GND
INV
BD9703FP BD9703CP-V5
BD9703T
BD9703T-V5
Absolute Maximum Ratings
(Ta=25°C)
Parameter
Supply Voltage (VCC-GND)
STBY-GND
OUT-GND
INV-GND
Maximum Switching Current
Power Dissipation
Operating Temperature
Storage Temperature
TO252
TO220
Symbol
V
CC
V
STBY
V
OUT
V
INV
I
OUT
Pd
Topr
Tstg
Rating
36
36
36
10
1.5
0.8
(Note 2)
2
(Note 3)
-40 to +85
-55 to +150
Unit
V
V
V
V
A
W
°C
°C
(Note 2) Without external heat sink, reduced by 6.4mW/°C over 25°C
(Note 3) Without external heat sink, reduced by 16.0mW/°C over 25°C
Reduced by 160mW/°C, when mounted on ideal size heatsink (Tc = Ta)
Caution:
Operating the IC over the absolute maximum ratings may damage the IC. The damage can either be a short circuit between pins or an open circuit
between pins and internal circuitry. Therefore, it is important to consider circuit protection measures, such as adding a fuse, in case the IC is operated over the
absolute maximum ratings.
Recommended Operating Conditions
(Ta=-40°C to +85°C)
Parameter
Input Voltage
Output Voltage
Symbol
V
CC
V
OUT
Limit
Min
8.0 or
V
OUT
+3
(Note 4)
1.0
Typ
-
-
Max
35.0
32
Unit
V
V
(Note 4) The minimum value of an input voltage is the higher either 8.0V or V
OUT
+3
Electrical Characteristics
(Unless otherwise noted, Ta=25°C, V
CC
=12V, V
OUT
=5V, V
STBY
=3V)
Parameter
Output ON-Resistance
Efficiency
Switching Frequency
Load Regulation
Line Regulation
Over-Current Protection Limit
INV Pin Threshold Voltage
INV Pin Threshold Voltage
Thermal Variation
INV Pin Input Current
STBY Pin
Threshold Voltage
STBY Pin Input Current
Circuit Current
Stand-by Current
ON
OFF
Symbol
R
ON
η
f
OSC
ΔV
OUTLOAD
ΔV
OUTLINE
I
OCP
V
INV
ΔV
INV
I
INV
V
STBYON
V
STBYOFF
I
STBY
I
CC
I
ST
Limit
Min
-
-
270
-
-
1.6
0.98
-
-
2.0
-0.3
5
-
-
Typ
1.0
86
300
10
40
-
1.00
±0.5
1
-
-
25
5
0
Max
1.5
-
330
40
100
-
1.02
-
-
36
+0.3
50
12
5
Unit
Ω
%
kHz
mV
mV
A
V
%
μA
V
V
μA
mA
μA
V
STBY
＝0V
V
STBY
=3V
Tj=0°C to 85°C
Design guarantee
V
INV
=1.0V
V
CC
=20V,I
OUT
=0.5A to 1.5A
V
CC
=10V to 30V,I
OUT
=1.0A
Conditions
Design guarantee
I
OUT
＝0.5A
Design guarantee
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© 2014 ROHM Co., Ltd. All rights reserved.
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BD9703FP BD9703CP-V5
Typical Performance Curves
BD9703T
BD9703T-V5
(Unless otherwise specified: Ta=25deg, V
CC
=12V, V
OUT
=5V, V
STBY
=3V)
Output Voltage : V
OUT
[V]
Efficiency : η [%]
Output Current : I
OUT
[A]
Figure 3. Efficiency vs Output Current
Output Current : I
OUT
[A]
Figure 4. Output Voltage vs Output Current
(OCP V
CC
=20V)
OSC Frequency : f
OSC
[kHz]
Output Voltage : V
OUT
[V]
V
CC
=30V
V
CC
=20V
V
CC
=10V
Ambient Temperature : Ta [°C]
Figure 5. OSC Frequency vs Ambient Temperature
Output Current : I
OUT
[A]
Figure 6. Output Voltage vs Output Current
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BD9703FP BD9703CP-V5
BD9703T
BD9703T-V5
Typical Performance Curves – continued
(Unless otherwise specified: Ta=25deg, V
CC
=12V, V
OUT
=5V, V
STBY
=3V)
Output Voltage : V
OUT
[V]
Input Voltage : V
CC
[V]
Figure 7. Output Voltage vs Input Voltage
(V
OUT
=5V, R
OUT
=5Ω)
Circuit Current : I
CC
[mA]
Input Voltage : V
CC
[V]
Figure 8. Circuit Current vs Input Voltage
(No Load)
OSC Frequency : f
OSC
[kHz]
Output Voltage : V
OUT
[V]
Switching Current : I
SW
[A]
Figure 9. Output Voltage vs Switching Current
Input Voltage : V
CC
[V]
Figure 10. OSC Frequency vs Input Voltage
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© 2014 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
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TSZ02201-0Q3Q0AJ00410-1-2
04.Nov.2014 Rev.001
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