Datasheet
8.0V to 35V, 3.0A/1.5A 1ch
Buck Converter with Integrated FET
BD9873CP-V5 BD9874CP-V5
Key Specifications
General Description
The
BD9873CP-V5
and
BD9874CP-V5
is
a
single-channel step-down switching regulator integrated
with a P-Channel MOSFET. Its circuitry eliminates the
need for external compensation and consisting only of a
diode, a coil and a ceramic capacitor, reducing the board
size significantly.
Features
Built-in P-Channel FET Ensures High Efficiency
Output Voltage Adjustable Via External Resistors
Soft-Start Time : 4ms (fixed)
Built-in Over-Current and Thermal Shutdown
Protection Circuits
ON/OFF Control Via STBY Pin
Input Voltage Range:
8.0V to 35V
Output Voltage Range:1.0V to 0.8Vx(VCC-IOUTxRON)V
Output Current:
BD9873CP-V5:
1.5A(Max)
BD9874CP-V5:
3.0A(Max)
Switching Frequency:
110kHz(Typ)
P-Channel FET ON-Resistance:
BD9873CP-V5:
1.0Ω(Typ)
BD9874CP-V5:
0.5Ω(Typ)
Standby Current:
1μA(Typ)
Operating Temperature Range:
-40°C to +85°C
Package
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.
Typical Application Circuit
TO220CP-V5
10.00mm x 20.12mm x 4.60mm
L1
VIN
VCC
+
C2
VOUT
OUT
CIN
D1
+
C1
C3
R1
STBY
INV
R2
GND
Figure 1. Typical Application Circuit
○Product structure:Silicon monolithic integrated circuit
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Pin Configuration
TOP VIEW
1
2
3
4
5
VCC GND STBY
OUT INV
Figure 2. Pin Configuration
Pin Descriptions
Pin No.
Pin Name
1
VCC
Input power supply pin
Function
2
OUT
Internal P-Channel FET drain pin
3
GND
Ground
4
INV
Output voltage feedback pin
5
STBY
ON/OFF control pin
Block Diagram
VCC
1
VREF
PWM COMP
DRIVER
OSC
5
STBY
CTL
LOGIC
STBY
2
OCP
TSD
OUT
Error AMP
4
INV
SS
3
GND
Figure 3. Block Diagram
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Absolute Maximum Ratings (Ta=25°C)
Parameter
Symbol
Rating
VCC
36
Unit
V
STBY-GND
VSTBY
36
V
OUT-GND
VOUT
36
V
INV-GND
VINV
5
V
Supply Voltage (VCC-GND)
Maximum Switching Current
IOUT
Power Dissipation
Pd
1.5
(Note 1)
BD9873
3.0
(Note 1)
BD9874
A
A
2.00 (Note 2)
W
Operating Temperature
Topr
-40 to +85
°C
Storage Temperature
Tstg
-55 to +150
°C
(Note 1) Do not exceed Pd, ASO.
(Note 2) Derated at 0.16W/°C over Ta=25°C
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
Limit
Symbol
Unit
Min
Typ
Max
35.0
0.8 x
(VCC-IOUT x RON)
Input Voltage
VCC
8.0
-
Output Voltage
VOUT
1.0
-
V
V
Electrical Characteristics (Unless otherwise noted, Ta=25°C, VCC=12V, VOUT=5V, VSTBY=3V)
Limit
Parameter
Symbol
Output ON-Resistance
Switching Frequency
Max
1.0
0.5
88
1.5
1.0
-
Ω
Ω
BD9873
BD9874
η
80
%
IOUT=0.5A
fOSC
99
110
121
kHz
-
5
40
mV
-
5
40
mV
-
5
25
mV
1.6
-
-
A
VCC=20V,
IOUT =0.5A to 1.5A
BD9873
VCC=20V,
IOUT =1.0A to 3.0A
BD9874
VCC=10V to 30V,
IOUT=1.0A
BD9873
3.2
-
-
A
BD9874
0.985
1.00
1.015
V
ΔVOUTLOAD
Load Regulation
ΔVOUTLOAD
Line Regulation
Conditions
Typ
RON
Efficiency
Unit
Min
Over-Current Protection
Limit
IOCP
INV Pin Threshold Voltage
VINV
IINV
-
1
2
μA
ON
VSTBYON
2.0
-
VCC
V
OFF
VSTBYOFF
-0.3
-
+0.3
V
ISTBY
5
15
30
μA
VSTBY=3V
ICC
-
5
12
mA
VINV=2V
Stand-by Current
IST
-
0
5
μA
Soft-Start Time
tSS
-
4
20
ms
VSTBY=0V
VSTBY=0V to 3V
INV Pin Input Current
STBY Pin
Threshold Voltage
STBY Pin Input Current
Circuit Current
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Typical Performance Curves
BD9873CP-V5
VCC=12V
Output Voltage : VOUT [V]
Efficiency : η [%]
VCC=12V
VCC=8V
VCC=36V
Load Current : IOUT [A]
Load Current : IOUT [A]
Figure 5 Output Voltage vs Load Current.
(Over Current Protection)
Figure 4. Efficiency vs Load Current
Output Voltage : VOUT [V]
Switching Frequency [kHz]
VCC=12V
Load Current : IOUT [A]
Temperature : Ta [°C]
Figure 7.Output Voltage vs Load Current
Figure 6. Switching Frequency vs Temperature
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Typical Performance Curves – continued
BD9873CP-V5
VSTB=3V
Circuit Current : ICC [mA]
Output Voltage : VOUT [V]
VOUT=5V
Supply Voltage : VCC [V]
Supply Voltage : VCC [V]
Figure 9. Circuit Current vs Supply Voltage
(IOUT=No Load)
Figure 8. Output Voltage vs Supply Voltage
VCC=12V
∆ VOUT [v]
Switching Frequency : fOSC [kHz]
VOUT=5V
Output Current : IOUT [A]
Supply Voltage : VCC [V]
Figure 10. Delta Output Voltage vs Output Current
ΔVOUT - IOUT
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Figure 11. Switching Frequency vs Supply Voltage
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Typical Performance Curves – continued
BD9873CP-V5
OFFSET [V]
Circuit Current : ICC (STB) [µA]
VCC=12V
Temperature: Ta [°C]
Temperature : Ta [°C]
Figure 13. Circuit Current vs Temperature
ICC (STB) - Ta
Figure 12. INV Pin Threshold Voltage vs Temperature
Typical Waveforms
BD9873CP-V5
5V / div
VOUT
VOUT
2V / div
Figure 14. Load Response
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Figure 15. Start-up Waveform
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Typical Performance Curves
BD9874CP-V5
VCC=12V
VCC=8V
Output Voltage : VOUT [V]
Efficiency [%]
VCC=12V
VCC=36V
Load Current : IOUT [A]
Load Current : IOUT [A]
Figure 16. Efficiency vs Load Current
Figure 17. Output Voltage vs Load Current
(Over Current Protection)
Output Voltage: VOUT [V]
Switching Frequency [kHz]
VCC=12V
Load Current : IOUT [A]
Temperature : Ta [°C]
Figure 19. Output Voltage vs Load Current
Figure 18. Switching Frequency vs Temperature
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Typical Performance Curves – continued
BD9874CP-V5
VSTB=3V
Circuit Current : ICC [mA]
Output Voltage : VOUT [V]
VOUT=5V
Supply Voltage : VCC [V]
Supply Voltage : VCC [V]
Figure 20. Output Voltage vs Supply Voltage
Figure 21. Circuit Current vs Supply Voltage
(IOUT=No Load)
VOUT=5V
∆ VOUT [V]
Switching Frequency : fOSC [kHz]
VCC=12V
Output Current : IOUT [A]
Supply Voltage : VCC [V]
Figure 23. Switching Frequency vs Supply Voltage
Figure 22. Delta Output Voltage vs Output Current
ΔVOUT - IOUT
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Typical Performance Curves – continued
BD9874CP-V5
OFFSET [V]
Circuit Current: ICC (STB) [µA]
VCC=12V
Temperature: Ta [°C]
Temperature : Ta [°C]
Figure 25. Circuit Current vs Temperature
(ICC (STB) – Ta )
Figure 24. INV Pin Threshold Voltage vs Temperature
Typical Waveforms
BD9874CP-V5
VOUT
VOUT
Figure 26. Load Response
Figure 27. Start-up Waveform
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Application Information
1. Block Function Explanation
(1) VREF
Generates a temperature-independent regulated voltage from the VCC input.
(2) OSC
Generates a triangular wave with an oscillation frequency of 110 kHz or as set by the internal resistors and capacitors.
The output of this block goes to the PWM comparator.
(3) Error AMP
Detects the output voltage through a voltage divider network and compares it with an internal reference voltage. The
output of this block is the amplified difference between the detected output voltage and the reference.
(4) PWM COMP
Converts the Error AMP output to PWM pulses going to the Driver block.
(5) DRIVER
This push-pull FET driver accepts PWM input pulses from PWM COMP block and drives the internal P-channel
MOSFET.
(6) STBY
Controls ON/OFF operation using STBY pin. The output is ON when STBY is High.
(7) Thermal Shutdown (TSD)
This circuit protects the IC against thermal runaway and damage due to excessive heat. A thermal sensor detects the
junction temperature and switches the output OFF once the temperature exceeds a threshold value (175deg).
Hysteresis is built in (15deg) in order to prevent malfunctions due to temperature fluctuations.
(8) Over-Current Protection (OCP)
The OCP circuit detects the voltage difference between VCC and OUT by measuring the current through the internal
P-Channel MOSFET and switches the output OFF once the voltage reaches the threshold value. The OCP block is a
self-recovery type (not latch).
(9) Soft-Start (SS)
This block conducts soft start operations. When STBY is High and the IC starts up the internal capacitor begins
charging. The soft start time is set to 5ms.
2. Notes for PCB Layout
C3:0.47µF
R2:1kΩ
R1:4kΩ
4
STBY 5
INV
L1:100µH
C1:100µF
1 VCC
C2:4.7µF
OUT 2
GND
3
5.0V
D1
C4:680µF
Figure 28. Layout
(1) Place capacitors between VCC and Ground, and the Schottky diode as close as possible to the IC to reduce noise
and maximize efficiency.
(2) Connect resistors between INV and Ground, and the output capacitor filter at the same ground potential in order to
stabilize the output voltage. (If the patterning is longer or thin, it’s possible to cause ringing or waveform crack.)
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3. Application Component Selection and Settings
(1) Inductor L1
Large inductor series impedance will result in deterioration of efficiency. OCP operation greater than 1.6A(BD9873) or
3.2A(BD9874) may cause inductor overheating, possibly leading to overload or output short.
Note that the current rating for the coil should be higher than I OUT ( MAX ) I L .
where:
IOUT (MAX) is the maximum load current.
If you allow current flow more than maximum current rating, the coil will overload, causing magnetic saturation, and
those account for efficiency deterioration. Select a coil with enough current rating which doesn’t exceed peak current.
I L
VCC VOUT VOUT
L1
VCC
1
f OSC
where:
L1 is the inductor value.
VCC is the maximum input voltage.
VOUT is the output voltage.
∆IL is the coil ripple current value.
fosc is the oscillation frequency.
(2) Schottky Barrier Diode D1
Select a Schottky diode having an inter-terminal capacity as small as possible (reverse recovery time as short as
possible) and a forward voltage VF as low as possible. (Noise can be reduced and efficiency improved by reduction of
switching noise and switching loss, as well as reduction of voltage drop loss of forward voltage.)
Diode should be selected on the basis of maximum current rating in forward direction, voltage rating in reverse
direction, and power dissipation of diode.
(a) The maximum current rating is higher than the combined maximum load current and coil ripple current (∆IL).
(b) The reverse voltage rating is higher than the IN value.
(c) Recommend using a diode with smaller the reverse current as possible
In the high temperature case, the reverse current is increasing and it may cause overdrive
(d) Power dissipation for the selected diode must be within the rated level.
The power dissipation of the diode is expressed by the following formula:
Pdi I OUT ( MAX ) VF (1 VOUT / VCC )
where:
IOUT (MAX) is the maximum load current.
VF is the forward voltage.
VOUT is the output voltage.
VCC is the input voltage.
(3) Output Capacitor C4
A suitable output capacitor should satisfy the following formula for ESR:
ESR VL / I L
where:
∆VL is the permissible ripple voltage.
∆IL is the coil ripple current.
Another factor that must be considered is the permissible ripple current. Select a capacitor with sufficient margin,
governed by the following formula:
I RMS I L / 2 3
where:
IRMS is the effective value of ripple current to the output capacitor
∆IL is the coil ripple current
The output capacitor is a major factor for system stability. When an inappropriate capacitor is selected, expected
characteristics may not be guaranteed depending on ambient temperature, output voltage setting condition, etc.
Fully confirm ESR, temperature characteristics, DC, and bias characteristics before evaluation.
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(4) Intput Capacitor C1,C2
The input capacitor is the source of current flow to the coil via the built-in P-Channel FET when the FET is ON. When
selecting the input capacitor, sufficient margin must be provided to accommodate capacitor voltage and permissible
ripple current. The expression below defines the effective value of the ripple current to the input capacitor. It should be
used in determining the suitability of the capacitor in providing sufficient margin for the permissible ripple current.
I RMS I OUT
1 VOUT
/ VCC VOUT / VCC
where:
IRMS is the effective value of the ripple current to the input capacitor.
IOUT is the output load current.
VOUT is the output voltage.
VCC is the input voltage.
(5) Capacitor,C3
This capacitor is utilized to stabilize the frequency characteristics.
When C3 is removed, overshoot or undershoot may occur during start-up or in rapid change of load.
Be sure to insert 0.47 μF.
(6) Resistor R1, R2
These resistors determine the output voltage:
VOUT 1.0V (1 R1 / R2 )
Select resistors less than 10kΩ.
BD9873CP-V5
Inductor
L1=100μH
: RCR1616 (SUMIDA)
Schottky Diode
D1= RB050LA-40 (ROHM)
Capacitor
C1=100μF
: Al electrolytic capacitor
C2=4.7μF
: Laminated ceramic capacitor
C3=0.47μF
: Laminated ceramic capacitor
C4=680μF
: Al electrolytic capacitor
BD9874CP-V5
Inductor
Schottky Diode
Capacitor
L1=100μH
: RCR1616 (SUMIDA)
D1=RB050LA-40(ROHM)
C1 =100μF
: Al electrolytic capacitor
C2 = 4.7μF
:Laminated ceramic capacitor
C3 = 0.47μF
:Laminated ceramic capacitor
C4 = 680μF
: Al electrolytic capacitor
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4. Tj (Tip Junction Temperature) Calculating Method
It is impossible to measure the tip junction temperature Tj outside the IC, but it can be calculated by the formula shown
below.
Calculation method of tip junction temperature Tj
Tj W j c Tc
where:
W is the Power consumed by IC (calculated by the formula below)
θj - c is the Thermal resistance from the tip to the back of the package 12.5 °C/W for TO220 package
Tc is the IC surface temperature (to be measured by thermocouple, etc.)
Calculation method of electric power W consumed by IC
W VIN I IN VOUT I OUT
Where:
VIN is the Input voltage
IIN is the Input voltage
VOUT is the Output voltage
IOUT is the Load Current
VF is the forward voltage of Schottky diode
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Power Dissipation
Power Dissipation : Pd [W]
POWER DISSIPATION : Pd [W]
15
(1) No heat sink
(2) Aluminum heat sink
50 x 50 x 2 (mm3)
(3) Aluminum heat sink
100 x 100 x 2 (mm3)
(3) 11.0W
10
(2) 6.5W
5
(1) 2.0W
0
0
25
50
75
100
125
AmbientTEMPERATURE
Temperature : Ta :[°C]
AMBIENT
Ta[C]
150
Figure 29. Power Dissipation
I/O Equivalent Circuit
1Pin,FIN (VCC, GND)
2pin (OUT)
4pin (INV)
5pin (STBY)
V
CC
VCC
VCC
VCC
VCC
VCC
STBY
VCC
VCC
INV
OUT
GND
Figure 30. Input Output Equivalent Circuit
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Operational Notes
1.
Reverse Connection of Power Supply
Connecting the power supply in reverse polarity can damage the IC. Take precautions against reverse polarity when
connecting the power supply, such as mounting an external diode between the power supply and the IC’s power
supply pins.
2.
Power Supply Lines
Design the PCB layout pattern to provide low impedance supply lines. Separate the ground and supply lines of the
digital and analog blocks to prevent noise in the ground and supply lines of the digital block from affecting the analog
block. Furthermore, connect a capacitor to ground at all power supply pins. Consider the effect of temperature and
aging on the capacitance value when using electrolytic capacitors.
3.
Ground Voltage
Ensure that no pins are at a voltage below that of the ground pin at any time, even during transient condition.
4.
Ground Wiring Pattern
When using both small-signal and large-current ground traces, the two ground traces should be routed separately but
connected to a single ground at the reference point of the application board to avoid fluctuations in the small-signal
ground caused by large currents. Also ensure that the ground traces of external components do not cause variations
on the ground voltage. The ground lines must be as short and thick as possible to reduce line impedance.
5.
Thermal Consideration
Should by any chance the power dissipation rating be exceeded the rise in temperature of the chip may result in
deterioration of the properties of the chip. In case of exceeding this absolute maximum rating, increase the board size
and copper area to prevent exceeding the Pd rating.
6.
Recommended Operating Conditions
These conditions represent a range within which the expected characteristics of the IC can be approximately
obtained. The electrical characteristics are guaranteed under the conditions of each parameter.
7.
Inrush Current
When power is first supplied to the IC, it is possible that the internal logic may be unstable and inrush current may
flow instantaneously due to the internal powering sequence and delays, especially if the IC has more than one power
supply. Therefore, give special consideration to power coupling capacitance, power wiring, width of ground wiring,
and routing of connections.
8.
Operation Under Strong Electromagnetic Field
Operating the IC in the presence of a strong electromagnetic field may cause the IC to malfunction.
9.
Testing on Application Boards
When testing the IC on an application board, connecting a capacitor directly to a low-impedance output pin may
subject the IC to stress. Always discharge capacitors completely after each process or step. The IC’s power supply
should always be turned off completely before connecting or removing it from the test setup during the inspection
process. To prevent damage from static discharge, ground the IC during assembly and use similar precautions during
transport and storage.
10. Inter-pin Short and Mounting Errors
Ensure that the direction and position are correct when mounting the IC on the PCB. Incorrect mounting may result in
damaging the IC. Avoid nearby pins being shorted to each other especially to ground, power supply and output pin.
Inter-pin shorts could be due to many reasons such as metal particles, water droplets (in very humid environment)
and unintentional solder bridge deposited in between pins during assembly to name a few.
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Operational Notes – continued
11. Unused Input Pins
Input pins of an IC are often connected to the gate of a MOS transistor. The gate has extremely high impedance and
extremely low capacitance. If left unconnected, the electric field from the outside can easily charge it. The small
charge acquired in this way is enough to produce a significant effect on the conduction through the transistor and
cause unexpected operation of the IC. So unless otherwise specified, unused input pins should be connected to the
power supply or ground line.
12. Regarding the Input Pin of the IC
This monolithic IC contains P+ isolation and P substrate layers between adjacent elements in order to keep them
isolated. P-N junctions are formed at the intersection of the P layers with the N layers of other elements, creating a
parasitic diode or transistor. For example (refer to figure below):
When GND > Pin A and GND > Pin B, the P-N junction operates as a parasitic diode.
When GND > Pin B, the P-N junction operates as a parasitic transistor.
Parasitic diodes inevitably occur in the structure of the IC. The operation of parasitic diodes can result in mutual
interference among circuits, operational faults, or physical damage. Therefore, conditions that cause these diodes to
operate, such as applying a voltage lower than the GND voltage to an input pin (and thus to the P substrate) should
be avoided.
Resistor
Transistor (NPN)
Pin A
Pin B
C
E
Pin A
N
P+
P
N
N
P+
N
Pin B
B
Parasitic
Elements
N
P+
N P
N
P+
B
N
C
E
Parasitic
Elements
P Substrate
P Substrate
GND
GND
Parasitic
Elements
GND
Parasitic
Elements
GND
N Region
close-by
Figure 31. Example of monolithic IC structure
13. Thermal Shutdown Circuit(TSD)
This IC has a built-in thermal shutdown circuit that prevents heat damage to the IC. Normal operation should always
be within the IC’s power dissipation rating. If however the rating is exceeded for a continued period, the junction
temperature (Tj) will rise which will activate the TSD circuit that will turn OFF all output pins. When the Tj falls below
the TSD threshold, the circuits are automatically restored to normal operation.
Note that the TSD circuit operates in a situation that exceeds the absolute maximum ratings and therefore, under no
circumstances, should the TSD circuit be used in a set design or for any purpose other than protecting the IC from
heat damage.
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Ordering Information
B
D
9
8
7
x
Part Number
9873
9874
C
P
-
V
5
-
Package
CP-V5: TO220CP-V5
E2
Packaging and forming specification
E2: Embossed tape and reel
Lineup
Maximum Output
Current (Max)
1.5 A
Part Number Marking
3.0 A
Package
Orderable Part Number
BD9873CP
TO220CP-V5
Reel of 500
BD9873CP-V5E2
BD9874CP
TO220CP-V5
Reel of 500
BD9874CP-V5E2
Marking Diagram
TO220CP-V5
(TOP VIEW)
Part Number Marking
LOT Number
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© 2014 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
17/19
TSZ02201-0Q3Q0AJ00440-1-2
05.Nov.2014 Rev.001
BD9873CP-V5 BD9874CP-V5
Physical Dimension, Tape and Reel information
Package Name
www.rohm.com
© 2014 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
TO220CP-V5
18/19
TSZ02201-0Q3Q0AJ00440-1-2
05.Nov.2014 Rev.001
BD9873CP-V5 BD9874CP-V5
Revision History
Date
Revision
05.Nov.2014
001
Changes
New Release
www.rohm.com
© 2014 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
19/19
TSZ02201-0Q3Q0AJ00440-1-2
05.Nov.2014 Rev.001
Notice
Precaution on using ROHM Products
1.
Our Products are designed and manufactured for application in ordinary electronic equipments (such as AV equipment,
OA equipment, telecommunication equipment, home electronic appliances, amusement equipment, etc.). If you
(Note 1)
intend to use our Products in devices requiring extremely high reliability (such as medical equipment
, transport
equipment, traffic equipment, aircraft/spacecraft, nuclear power controllers, fuel controllers, car equipment including car
accessories, safety devices, etc.) and whose malfunction or failure may cause loss of human life, bodily injury or
serious damage to property (“Specific Applications”), please consult with the ROHM sales representative in advance.
Unless otherwise agreed in writing by ROHM in advance, ROHM shall not be in any way responsible or liable for any
damages, expenses or losses incurred by you or third parties arising from the use of any ROHM’s Products for Specific
Applications.
(Note1) Medical Equipment Classification of the Specific Applications
JAPAN
USA
EU
CHINA
CLASSⅢ
CLASSⅡb
CLASSⅢ
CLASSⅢ
CLASSⅣ
CLASSⅢ
2.
ROHM designs and manufactures its Products subject to strict quality control system. However, semiconductor
products can fail or malfunction at a certain rate. Please be sure to implement, at your own responsibilities, adequate
safety measures including but not limited to fail-safe design against the physical injury, damage to any property, which
a failure or malfunction of our Products may cause. The following are examples of safety measures:
[a] Installation of protection circuits or other protective devices to improve system safety
[b] Installation of redundant circuits to reduce the impact of single or multiple circuit failure
3.
Our Products are designed and manufactured for use under standard conditions and not under any special or
extraordinary environments or conditions, as exemplified below. Accordingly, ROHM shall not be in any way
responsible or liable for any damages, expenses or losses arising from the use of any ROHM’s Products under any
special or extraordinary environments or conditions. If you intend to use our Products under any special or
extraordinary environments or conditions (as exemplified below), your independent verification and confirmation of
product performance, reliability, etc, prior to use, must be necessary:
[a] Use of our Products in any types of liquid, including water, oils, chemicals, and organic solvents
[b] Use of our Products outdoors or in places where the Products are exposed to direct sunlight or dust
[c] Use of our Products in places where the Products are exposed to sea wind or corrosive gases, including Cl2,
H2S, NH3, SO2, and NO2
[d] Use of our Products in places where the Products are exposed to static electricity or electromagnetic waves
[e] Use of our Products in proximity to heat-producing components, plastic cords, or other flammable items
[f] Sealing or coating our Products with resin or other coating materials
[g] Use of our Products without cleaning residue of flux (even if you use no-clean type fluxes, cleaning residue of
flux is recommended); or Washing our Products by using water or water-soluble cleaning agents for cleaning
residue after soldering
[h] Use of the Products in places subject to dew condensation
4.
The Products are not subject to radiation-proof design.
5.
Please verify and confirm characteristics of the final or mounted products in using the Products.
6.
In particular, if a transient load (a large amount of load applied in a short period of time, such as pulse. is applied,
confirmation of performance characteristics after on-board mounting is strongly recommended. Avoid applying power
exceeding normal rated power; exceeding the power rating under steady-state loading condition may negatively affect
product performance and reliability.
7.
De-rate Power Dissipation (Pd) depending on Ambient temperature (Ta). When used in sealed area, confirm the actual
ambient temperature.
8.
Confirm that operation temperature is within the specified range described in the product specification.
9.
ROHM shall not be in any way responsible or liable for failure induced under deviant condition from what is defined in
this document.
Precaution for Mounting / Circuit board design
1.
When a highly active halogenous (chlorine, bromine, etc.) flux is used, the residue of flux may negatively affect product
performance and reliability.
2.
In principle, the reflow soldering method must be used on a surface-mount products, the flow soldering method must
be used on a through hole mount products. If the flow soldering method is preferred on a surface-mount products,
please consult with the ROHM representative in advance.
For details, please refer to ROHM Mounting specification
Notice-GE
© 2013 ROHM Co., Ltd. All rights reserved.
Rev.003
Precautions Regarding Application Examples and External Circuits
1.
If change is made to the constant of an external circuit, please allow a sufficient margin considering variations of the
characteristics of the Products and external components, including transient characteristics, as well as static
characteristics.
2.
You agree that application notes, reference designs, and associated data and information contained in this document
are presented only as guidance for Products use. Therefore, in case you use such information, you are solely
responsible for it and you must exercise your own independent verification and judgment in the use of such information
contained in this document. ROHM shall not be in any way responsible or liable for any damages, expenses or losses
incurred by you or third parties arising from the use of such information.
Precaution for Electrostatic
This Product is electrostatic sensitive product, which may be damaged due to electrostatic discharge. Please take proper
caution in your manufacturing process and storage so that voltage exceeding the Products maximum rating will not be
applied to Products. Please take special care under dry condition (e.g. Grounding of human body / equipment / solder iron,
isolation from charged objects, setting of Ionizer, friction prevention and temperature / humidity control).
Precaution for Storage / Transportation
1.
Product performance and soldered connections may deteriorate if the Products are stored in the places where:
[a] the Products are exposed to sea winds or corrosive gases, including Cl2, H2S, NH3, SO2, and NO2
[b] the temperature or humidity exceeds those recommended by ROHM
[c] the Products are exposed to direct sunshine or condensation
[d] the Products are exposed to high Electrostatic
2.
Even under ROHM recommended storage condition, solderability of products out of recommended storage time period
may be degraded. It is strongly recommended to confirm solderability before using Products of which storage time is
exceeding the recommended storage time period.
3.
Store / transport cartons in the correct direction, which is indicated on a carton with a symbol. Otherwise bent leads
may occur due to excessive stress applied when dropping of a carton.
4.
Use Products within the specified time after opening a humidity barrier bag. Baking is required before using Products of
which storage time is exceeding the recommended storage time period.
Precaution for Product Label
QR code printed on ROHM Products label is for ROHM’s internal use only.
Precaution for Disposition
When disposing Products please dispose them properly using an authorized industry waste company.
Precaution for Foreign Exchange and Foreign Trade act
Since our Products might fall under controlled goods prescribed by the applicable foreign exchange and foreign trade act,
please consult with ROHM representative in case of export.
Precaution Regarding Intellectual Property Rights
1.
All information and data including but not limited to application example contained in this document is for reference
only. ROHM does not warrant that foregoing information or data will not infringe any intellectual property rights or any
other rights of any third party regarding such information or data. ROHM shall not be in any way responsible or liable
for infringement of any intellectual property rights or other damages arising from use of such information or data.:
2.
No license, expressly or implied, is granted hereby under any intellectual property rights or other rights of ROHM or any
third parties with respect to the information contained in this document.
Other Precaution
1.
This document may not be reprinted or reproduced, in whole or in part, without prior written consent of ROHM.
2.
The Products may not be disassembled, converted, modified, reproduced or otherwise changed without prior written
consent of ROHM.
3.
In no event shall you use in any way whatsoever the Products and the related technical information contained in the
Products or this document for any military purposes, including but not limited to, the development of mass-destruction
weapons.
4.
The proper names of companies or products described in this document are trademarks or registered trademarks of
ROHM, its affiliated companies or third parties.
Notice-GE
© 2013 ROHM Co., Ltd. All rights reserved.
Rev.003
Datasheet
General Precaution
1. Before you use our Pro ducts, you are requested to care fully read this document and fully understand its contents.
ROHM shall n ot be in an y way responsible or liabl e for fa ilure, malfunction or acci dent arising from the use of a ny
ROHM’s Products against warning, caution or note contained in this document.
2. All information contained in this docume nt is current as of the issuing date and subj ect to change without any prior
notice. Before purchasing or using ROHM’s Products, please confirm the la test information with a ROHM sale s
representative.
3.
The information contained in this doc ument is provi ded on an “as is” basis and ROHM does not warrant that all
information contained in this document is accurate an d/or error-free. ROHM shall not be in an y way responsible or
liable for an y damages, expenses or losses incurred b y you or third parties resulting from inaccur acy or errors of or
concerning such information.
Notice – WE
© 2014 ROHM Co., Ltd. All rights reserved.
Rev.001