Datasheet
8V to 35V, 3.0A 1ch
Buck Converter with Integrated FET
BD9702CP-V5 BD9702T BD9702T-V5
General Description
The BD9702xx 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).
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
3.0A(Max)
110kHz(Typ)
0.5Ω(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 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.
TO220CP-V5
10.00mm x 20.12mm x 4.60mm
TO220FP-5
10.00mm x 30.50mm x 4.60mm
Typical Application Circuit
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
INV
4
R
2
: 1kΩ
3
GND
Figure 1. Typical Application Circuit
〇Product
structure : Silicon monolithic integrated circuit
.
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© 2014 ROHM Co., Ltd. All rights reserved.
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〇This
product has no designed protection against radioactive rays
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BD9702CP-V5 BD9702T BD9702T-V5
Block Diagram
VCC
1
VREF
PWM COMP
DRIVER
OSC
STBY 5
STBY
CTL
LOGIC
2
TSD
OCP
OUT
Error AMP
4
INV
3
GND
Figure 2. Block Diagram
Pin Configuration
TO220CP-V5
(TOP VIEW)
TO220FP-5
(TOP VIEW)
TO220FP-5(V5)
(TOP VIEW)
1
2
3 4
5
1
2
3 4
5
1
2
3
4
5
STBY
Pin Description
Pin No.
1
2
3
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
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VCC
OUT
GND
INV
STBY
U
VCC
OUT
GND
INV
STBY
VCC
OUT
GND
INV
TSZ02201-0Q3Q0AJ00400-1-2
04.Nov.2014 Rev.001
BD9702CP-V5 BD9702T BD9702T-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
Symbol
V
CC
V
STBY
V
OUT
V
INV
I
OUT
Pd
Topr
Tstg
Rating
36
36
36
10
3
2
(Note 1)
-40 to +85
-55 to +150
Unit
V
V
V
V
A
W
°C
°C
(Note 1) 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 an 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
(Note 2)
Symbol
V
CC
V
OUT
Limit
Min
8.0 or V
OUT
+3
(Note 2)
Typ
-
-
Max
35.0
32
Unit
V
V
1.0
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
-
-
88
-
-
3.2
0.98
-
-
2.0
-0.3
5
-
-
Typ
0.5
86
110
10
40
-
1.00
±0.5
1
-
-
25
4
0
Max
1.5
-
132
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
=1A to 3A
V
CC
=10V to 30V, I
OUT
=1.0A
Conditions
Design guarantee
I
OUT
＝1A
Design guarantee
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04.Nov.2014 Rev.001
BD9702CP-V5 BD9702T BD9702T-V5
Typical Performance Curves
(Unless otherwise specified: Ta=25deg, V
CC
=12V, V
OUT
=5V, V
STBY
=3V)
Output Current : I
OUT
[A]
Figure 3. Efficiency vs Output Current
Output Voltage : V
OUT
[V]
Efficiency : η [%]
Output Current : I
OUT
[A]
Figure 4. Output Voltage vs Output Current
(OCP V
CC
=20V)
V
CC
=30V
OSC Frequency : f
OSC
[kHz]
Output Voltage : V
OUT
[V]
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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BD9702CP-V5 BD9702T BD9702T-V5
Typical Performance Curves- continued
(Unless otherwise specified: Ta=25deg, V
CC
=12V, V
OUT
=5V, V
STBY
=3V)
5
C
Circuit Current
R R E
[mA]
; [ mA ]
I R C U I T C U
: I
CC
N T
Output Voltage : V
OUT
[V]
4
3
2
1
0
10
Input Voltage : V
CC
[V]
Figure 7. Output Voltage vs Input Voltage
(V
OUT
=5V, R
OUT
=5Ω)
20
25
30
INPUT VOLTAGE
:
:
V
CC
[V]
Input Voltage
VCC [V]
15
35
Figure 8. Circuit Current vs Input Voltage
(No Load)
Switching Current : I
SW
[A]
Figure 9. Output Voltage vs Switching Current
OSC Frequency : f
OSC
[kHz]
Output Voltage : V
OUT
[V]
Input Voltage : V
CC
[V]
Figure 10. OSC Frequency vs Input Voltage
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