Datasheet
4.5V to 18V Input, 3.0A Integrated MOSFET
Single Synchronous Buck DC/DC Converter
BD9C301FJ-LB
General Description
This is the product guarantees long time support in
Industrial market. BD9C301FJ-LB is a synchronous buck
switching regulator with built-in low on-resistance power
MOSFETs. With wide input voltage range, it is capable
of providing current of up to 3 A. It is a current mode
control DC/DC converter and features high-speed
transient response. Phase compensation
can also be set easily.
Key Specifications
Input Voltage Range:
Reference Voltage:
Maximum Output Current:
Switching Frequency:
Pch MOSFET On Resistance:
Nch MOSFET On Resistance:
Standby Current:
Operating Temperature Range:
4.5V to 18.0V
0.8V
±
1%
3A(Max)
500kHz(Typ)
80mΩ(Typ)
45mΩ(Typ)
1μA (Typ)
-40°C to +85°C
Features
■
Long Time Support Product for Industrial
Applications.
■
Synchronous Single DC/DC Converter
■
Over Current Protection
■
Thermal Shutdown Protection
■
Under Voltage Lockout Protection
■
Short Circuit Protection
■
Fixed Soft Start Function
Package
SOP-J8
W(Typ) x D(Typ) x H(Max)
4.90mm x 6.00mm x 1.65mm
Applications
■
■
■
■
■
■
Industrial Equipment
LCD TVs
Set-top Boxes
DVD/Blu-ray Disc Players/Recorders
Broadband Network and Communication Interface
Entertainment Devices
SOP-J8
Typical Application Circuit
Figure 1. Application Circuit
○Product
structure: silicon monolithic integrated circuit
〇This
product has no designed protection against radioactive rays
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BD9C301FJ-LB
Pin Configuration
(TOP VIEW)
PGND
VIN
AGND
FB
1
2
3
4
Figure 2. Pin Assignment
8
7
6
5
SW
SW
EN
COMP
Pin Descriptions
Pin No.
1
Pin Name
PGND
Function
Ground pins for the output stage of the switching regulator.
2
VIN
This pins supply power to the control circuit and the output stage of the switching regulator.
Connecting a 10 µF and a 0.1µF ceramic capacitor is recommended.
3
AGND
Ground pin for the control circuit.
4
FB
An inverting input node for the gm error amplifier.
See page 13 for how to calculate the resistance of the output voltage setting.
An input pin for the switch current comparator and an output pin for the gm error amplifier. Connect a
frequency phase compensation component to this pin.
See page 13 for how to calculate the resistance and capacitance for phase compensation.
Turning this pin signal low (0.8 V or lower) forces the device to enter the shutdown mode. Turning this
pin signal high (2.0 V or higher) enables the device. This pin must be terminated.
5
COMP
6
7
EN
SW
8
Switch nodes. These pins are connected to the drain of Pch MOSFET and the drain of Nch MOSFET.
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Block Diagram
EN
6
VREF
OSC
SCP
OCP
UVLO
IBIAS
TSD
2
VIN
S
FB
4
ERR
LOGIC
7 SW
8
OUTPUT
COMP
5
SLOPE
PWM
R
PGND
1
SoftStart
3
AGND
Figure 3. Block Diagram
Absolute Maximum Ratings (Ta = 25C)
Parameter
Supply Voltage
SW Pin Voltage
EN Pin Voltage
Power Dissipation
(Note 1)
Storage Temperature Range
Maximum Junction Temperature
FB, COMP Pin Voltage
Symbol
V
IN
V
SW
V
EN
Pd
Tstg
Tjmax
V
LVPINS
Rating
20
20
20
0.68
-55 to +150
150
7
Unit
V
V
V
W
°C
°C
V
When mounted on a 70 mm x 70
mm x 1.6 mm 1-layer glass epoxy
board
Conditions
(Note1) Derate by 5.45 mW when operating above 25C.
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 the 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.
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Recommended Operating Conditions
Parameter
Supply Voltage
Output Current
Output Voltage Setting Range
Operating Junction Temperature
Range
(Note1) V
IN
×0.125
≥ 0.8 [V]
Symbol
V
IN
I
OUT
V
RANGE
Tj
Rating
Min
4.5
-
V
IN
×0.125
(Note 1)
-40
Typ
-
-
-
-
Max
18.0
3.0
V
IN
×0.7
+125
Unit
V
A
V
°C
Electrical Characteristics
(Ta = 25C, V
IN
= 12 V, V
EN
= 5 V unless otherwise specified)
Parameter
Circuit Current in Active
Circuit Current in Standby
FB Pin Voltage
FB Input Current
Switching Frequency
High Side FET On Resistance
Low Side FET On Resistance
Power MOS Leakage Current
Current Limit
Minimum Duty Ratio
UVLO Threshold
UVLO Hysteresis Voltage
EN High-Level Input Voltage
EN Low-Level Input Voltage
Soft Start Time
(Note 1) V
FB
:FB Pin Voltage, V
EN
:EN Pin Voltage,
(Note 2) Current capability should not exceed Pd.
Symbol
I
Q_active
I
Q_stby
V
FB
I
FB
f
OSC
R
ONH
R
ONL
I
LSW
I
LIMIT
Min_duty
Limits
Min
-
-
0.792
-
450
-
-
-
3.5
-
3.75
-
2.0
-
0.5
Typ
1.5
1.0
0.800
0
500
80
45
0
-
-
4.0
0.2
-
-
1.0
Max
2.5
10.0
0.808
2
550
-
-
5
-
12.5
4.25
-
-
0.8
2.0
Unit
mA
μA
V
μA
kHz
mΩ
mΩ
μA
A
%
V
V
V
V
msec
Conditions
V
FB
= 0.75V, V
EN
= 5V
V
EN
= 0V
FB-COMP Short
(Voltage follower)
V
IN
= 12V , I
SW
= -1A
V
IN
= 12V , I
SW
= -1A
V
IN
= 18V , V
SW
= 18V
V
UVLO
V
UVLOHYS
V
ENH
V
ENL
T
SS
Wake up V
IN
Voltage
I
SW
:SW Pin Current
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BD9C301FJ-LB
Typical Performance Curves
100
90
80
V
OUT
= 5.0V
110
100
90
V
OUT
= 3.3V
70
Efficiency [%]
80
Tc[
℃
]
70
60
50
60
50
40
30
20
10
0
0
1
I
LOAD
[A]
Figure 4. Efficiency
(V
IN
=12V, L=4.7µH (V
OUT
=3.3/5.0V), Cout=44µF)
V
IN
=12V
L=4.7µH
Cout=44µF
40
30
20
2
3
0.0
0.5
1.0
1.5
I
LOAD
[A]
2.0
2.5
3.0
Figure 5. T
C
vs I
LOAD
(V
IN
=12V, V
OUT
=3.3V, L=4.7µH, Cout=44µF)
V
OUT
(AC)
[20mV/div]
V
OUT
(AC)
[20mV/div]
SW
[5V/div]
SW [5V/div]
T - Time - 1µsec/div
Figure 6. Output Ripple Voltage
(V
IN
=12V, V
OUT
=3.3V, L=4.7µH, Cout=44µF, Iout=0A)
T - Time - 1µsec/div
Figure 7. Output Ripple Voltage
(V
IN
=12V, V
OUT
=3.3V, L=4.7µH, Cout=44µF, Iout=3A)
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