Data Sheet
Non-Isolated Step-Down 3-Terminal DC/DC Converters
BP5275-18 / BP5275-25 / BP5275-33 / BP5275-50
Description
The BP5275 series of DC/DC converters utilize a synchronous
rectification system.
A control circuit, switching element, and coil are built in, along
with input/output capacitors, resulting in stable operation with
no external components required.
High conversion efficiency, combined with an original heat
dissipation structure, enables configuration an ultra-compact
switching power supplies.
500mA output is possible with no heat sink required (800mA
with heat sink).
In addition, the ICs are pin-compatible with conventional
TO-220 LDO regulators, making replacement easy.
Low ripple voltage with high precision output ensure stable
operation against the fluctuating voltages from main power
supplies, making them ideal for use as local power supplies
(i.e. for microcontrollers).
Applications
Power supplies for copiers, personal computers,
facsimiles, AV equipment, measuring instruments,
vending machines, security device, registers,
industrial equipment, and maintenance tools
Features
1) No external parts required
2) High power conversion efficiency.
3) Heat sink unnecessary.
4) Low output ripple voltage
5) High output voltage accuracy
6) Pin-compatible with conventional 3-pin LDOs
7) Compact package.
BP5275-18 / BP5275-25 / BP5275-33 / BP5275-50 : SIP3
Dimensions (Unit : mm)
13.8 MAX
20.3
23.0 MAX
4.0±1.0
2.54±0.2
Pin No.1 2 3
4.2
5.2
5.2
2xC0.5
2.6
0.75
1.3
2.54±0.2
Note : Dimensions without tolerance is typical.
C0.5
0.5
List of the series
Input voltage
Output voltage
Maximum output current
(no heat sink / include heat sink)
Power conversion
efficiency (Vin=12V)
Absolute maximum ratings (Ta=25°C)
Parameter Symbol
Input voltage
Operating temperature range
Storage temperature range
Allowable maximum surface temperature
Maximum output current 1
Maximum output current 2
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© 2011 ROHM Co., Ltd. All rights reserved.
(with Heat Sink)
BP5275−18 BP5275−25 BP5275−33
4.5 to 14 4.5 to 14 5.0 to 14 V
1.8 2.5 3.3 V
500 / 800 500 / 800 500 / 800 mA
73 78 83 88
BP5275−18 BP5275−25 BP5275−33 BP5275−50
In V
V
Topr
Tstg
Tcmax
I
O1max
IO2max
15
−30 to 85
−40 to 105
100
500
800
15
−30 to 85
−40 to 105
100
500
800
BP5275−50
6.0 to 14
5.0
500 / 800
Limits
15
−30 to 85
−40 to 105
100
500
800
Unit
%
15
−30 to 85
−40 to 105
100
500
800
1/7
Unit
°C
°C
°C
°C
°C
2011.08 -
Rev. A
BP5275-18 / BP5275-25 / BP5275-33 / BP5275-50
Data Sheet
Block diagram
Control
Circuit
Electrical characteristics
BP5275−18 (Unless otherwise noted : Ta=25°C, Vin=12V, lo1=500mA)
Parameter Symbol Unit ConditionsMin. Typ. Max.
Input voltage
Output voltage
Output current 1
Output current 2
Line regulation
Load regulation
Output ripple voltage
Minimum start-up time
Conversion efficiency
Operation frequency
1 Derating required according to the input voltage and ambient temperature.
Vin 4
V
O V
1.75
I
O1
I
O2
Vr
Vl
Vp
Ts
f MHz1.5
0
0
4
65
12
1.80
5
10
5
7
73
14
1.85
500
800
50
50
80
Measurement circuit
Vin
Vin
V
mA
mA
mV
mV
mV
msec
%
GND
DC
O1=0mA
I
With heat sink
Vin=4 to 14V
O=0 to 500mA
I
P-P
Vin=0V 3V,Ro=3.6Ω
1 2 3
Io
AA
V
VV
1
1
Vout
GND
BP5275-25 (Unless otherwise noted : Ta=25°C, Vin=12V, lo1=500mA)
Parameter Symbol Unit ConditionsMin. Typ. Max.
Input voltage
Output voltage
Output current 1
Output current 2
Line regulation
Load regulation
Output ripple voltage
Minimum start-up time
Conversion efficiency
Operation frequency
1 Derating required according to the input voltage and ambient temperature.
Vin 4
V
O V
2.45
I
O1
I
O2
Vr
Vl
Vp
Ts
f MHz1.5
0
0
4
73
12
2.50
5
10
5
7
78
14
2.55
500
800
50
50
50
V
mA
mA
mV
mV
mV
msec
%
DC
O1=0mA
I
With heat sink
Vin=4 to 14V
O1=0 to 500mA
I
P-P
Vin=3V 4V,Ro=5Ω
1
1
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© 2011 ROHM Co., Ltd. All rights reserved.
2/7
2011.08 -
Rev. A
BP5275-18 / BP5275-25 / BP5275-33 / BP5275-50
Electrical characteristics
BP5275−33 (Unless otherwise noted :Ta=25°C, Vin=12V, lo1=500mA)
Parameter Symbol Unit ConditionsMin. Typ. Max.
Input voltage
Output voltage
Output current 1
Output current 2
Line regulation
Load regulation
Output ripple voltage
Minimum start-up time
Conversion efficiency
Operation frequency
1 Derating required according to the input voltage and ambient temperature.
Vin 4.5
V
O V
3.23
I
O1
I
O2
Vr
Vl
Vp
Ts
f MHz1.5
0
0
4
78
12
3.30
5
10
5
7
83
BP5275-50 (Unless otherwise noted : Ta=25°C, Vin=12V, lo1=500mA)
Parameter Symbol Unit ConditionsMin. Typ. Max.
Input voltage
Output voltage
Output current 1
Output current 2
Line regulation
Load regulation
Output ripple voltage
Minimum start-up time
Conversion efficiency
Operation frequency
1 Derating required according to the input voltage and ambient temperature.
Vin 6
V
O V
I
O1
I
O2
Vr
Vl
Vp
Ts
f MHz1.5
4.9
0
0
4
83
12
5.0
5
10
5
7
88
14
3.37
500
800
50
50
50
14
5.1
500
800
50
50
50
V
mA
mA
mV
mV
mV
msec
%
V
mA
mA
mV
mV
mV
msec
%
DC
O1=0mA
I
With heat sink
Vin=4.5 to 14V
O=0 to 500mA
I
P-P
Vin=3V 4.5V,Ro=6.6Ω
DC
O1=0mA
I
With heat sink
Vin=6 to 14V
O1=0 to 500mA
I
P-P
Vin=3V 6V,Ro=10Ω
Data Sheet
1
1
1
1
●OPERATION NOTES
・
This module will stop outputting because of protection circuit when the input voltage becomes maximum input voltage or less.
Please note that the input voltage must not become maximum input voltage in any state of the load.
・After the circuit starts, the output voltage needs to become the fixed voltage within minimum activation time.
If the output voltage is below the fixed voltage after the minimum activation time, it doesn’t work because of the protection circuit.
Please evaluate sufficiently about activation characteristics of input voltage and load characteristics when starting.
・When the output circuit shorts, short-circuit protection of timer-latch type will work and stop outputting.
To release the protection, it is necessary to turn on the switch again.
This product also has protection element for safety. The protection element is fused if the current, with which the protection
element will fuse, will be input by the time the short-circuit protection of timer-latch hangs.
Please evaluate sufficiently at using environment about the action when the output circuit shorts.
・There are some case that the heat generates at the module by exceeding allowable maximum surface temperature when the
load current which exceeds the maximum output current is electrified.
Please make design keeping enough margins not to exceed allowable maximum surface temperature at any time under any
application or any test conditions.
・The heat sink at back parts of the product is connected to GND. Please mind the arrangement not to contact with
surrounding parts.
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© 2011 ROHM Co., Ltd. All rights reserved.
3/7
2011.08 -
Rev. A
BP5275-18 / BP5275-25 / BP5275-33 / BP5275-50
1.75
1.76
1.77
1.78
1.79
1.80
1.81
1.82
1.83
1.84
1.85
0 100 200 300 400 500
0
10
20
30
40
50
60
70
80
90
100
0 100 200 500400300
1.75
1.76
1.77
1.78
1.79
1.80
1.81
1.82
1.83
1.84
1.85
0246810121416
1.75
1.76
1.77
1.78
1.79
1.80
1.81
1.82
1.83
1.84
1.85
0 100 200 300 400 500
0
100
200
300
400
500
600
65
℃
OPERATION RANGE
333mA
250mA
75
℃
-40 -20 0 20 40 60 80 100
Vin=10V以下
Vin=12V
Vin=14V
0
200
400
600
800
1000
-40 -20 0 20 40 60 80 100
Vin=12V以下
Vin=14V
OPERATION RANGE
●BP5275-18
Data Sheet
Line Regulation
Output VoltageVo [V]
Ta = 8 0 °C
Ta = 2 5 °C
Ta =−35°C
Intput VoltageVin [V]
Output Voltage vs. Input Voltage Fluctuation（Ta=25°C）
Output Voltage vs. Temperature Fluctuation（Vin=12V）
Output Voltage Vo [V]
Ta = 8 0 °C
Ta = 2 5 °C
Ta =−35°C
Output Current Io [ｍＡ]
Power Conversion Efficiency Fluctuation（Ta=25°C）
Output Voltage Vo [V]
Output Current Io [ｍＡ]
Derating Curve (No heat sink)
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© 2011 ROHM Co., Ltd. All rights reserved.
Load Current Io1 [mA]
Ambient Temperature Ta [°C]
Vin= 6V
Vin=12V
Vin=14V
Power Conversion Efficiencyη[%]
Vin= 6V
Vin=12V
Vin=14V
Output Current Io [ｍＡ]
Derating Curve (With heat sink)
76
OPERATION RANGE
℃
550mA
Load Current Io2 [mA]
4/7
Ambient Temperature Ta [°C]
2011.08 -
Rev. A
BP5275-18 / BP5275-25 / BP5275-33 / BP5275-50
2.45
2.46
2.47
2.48
2.49
2.50
2.51
2.52
2.53
2.54
2.55
0 100 200 300 400 500
0
10
20
30
40
50
60
70
80
90
100
2.45
2.46
2.47
2.48
2.49
2.50
2.51
2.52
2.53
2.54
2.55
2.45
2.46
2.47
2.48
2.49
2.50
2.51
2.52
2.53
2.54
2.55
0 100 200 300 400 500
0
100
200
300
400
500
600
65
℃
OPERATION RANGE
333mA
250mA
75
℃
-40 -20 0 20 40 60 80 100
Vin=10V以下
Vin=12V
Vin=14V
0
200
400
600
800
1000
-40 -20 0 20 40 60 80 100
Vin=12V以下
Vin=14V
OPERATION RANGE
●BP5275-25
Data Sheet
Line Regulation
Output VoltageVo [V]
Ta = 8 0 °C
Ta = 2 5 °C
Ta =−35°C
0246810121416
Intput VoltageVin [V] Output Current Io [ｍＡ]
Output Voltage vs. Input Voltage Fluctuation（Ta=25°C）
Output Voltage vs. Temperature Fluctuation（Vin=12V）
Output Voltage Vo [V]
Ta = 8 0 °C
Ta = 2 5 °C
Ta =−35°C
Power Conversion Efficiency Fluctuation（Ta=25°C）
Output Voltage Vo [V]
Derating Curve (No heat sink)
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© 2011 ROHM Co., Ltd. All rights reserved.
Load Current Io1 [mA]
Ambient Temperature Ta [℃]
Output Current Io [ｍＡ]
Vin= 6V
Vin=12V
Vin=14V
5/7
Vin= 6V
Power Conversion Efficiencyη[%]
Vin=12V
Vin=14V
0 100 200 500400300
Output Current Io [ｍＡ]
Derating Curve (With heat sink)
74
OPERATION RANGE
℃
528mA
Load Current Io2 [mA]
Ambient Temperature Ta [℃]
2011.08 -
Rev. A
BP5275-18 / BP5275-25 / BP5275-33 / BP5275-50
3.20
3.22
3.24
3.26
3.28
3.30
3.32
3.34
3.36
3.38
3.40
0 100 200 300 400 500
0
10
20
30
40
50
60
70
80
90
100
3.20
3.22
3.24
3.26
3.28
3.30
3.32
3.34
3.36
3.38
3.40
3.20
3.22
3.24
3.26
3.28
3.30
3.32
3.34
3.36
3.38
3.40
0 100 200 300 400 500
0
100
200
300
400
500
600
65
℃
OPERATION RANGE
333mA
250mA
75
℃
-40 -20 0 20 40 60 80 100
Vin=10V以下
Vin=12V
Vin=14V
0
200
400
600
800
1000
-40 -20 0 20 40 60 80 100
Vin=12V以下
Vin=14V
OPERATION RANGE
●BP5275-33
Data Sheet
Line Regulation
Output VoltageVo [V]
Ta = 8 0 °C
Ta = 2 5 °C
Ta =−35°C
0 2 4 6 8 10121416
Intput VoltageVin [V] Output Current Io [ｍＡ]
Output Voltage vs. Input Voltage Fluctuation（Ta=25°C）
Output Voltage vs. Temperature Fluctuation（Vin=12V）
Output Voltage Vo [V]
Ta = 8 0 °C
Ta = 2 5 °C
Ta =−35°C
Power Conversion Efficiency Fluctuation（Ta=25°C）
Output Voltage Vo [V]
Derating Curve (No heat sink)
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© 2011 ROHM Co., Ltd. All rights reserved.
Load Current Io1 [mA]
Ambient Temperature Ta [℃]
Output Current Io [ｍＡ]
Vin= 6V
Vin=12V
Vin=14V
6/7
Vin= 6V
Power Conversion Efficiencyη[%]
Vin=12V
Vin=14V
0 100 200 500400300
Output Current Io [ｍＡ]
Derating Curve (With heat sink)
OPERATION RANGE
73
℃
505mA
Load Current Io2 [mA]
Ambient Temperature Ta [℃]
2011.08 -
Rev. A
BP5275-18 / BP5275-25 / BP5275-33 / BP5275-50
4.90
4.92
4.94
4.96
4.98
5.00
5.02
5.04
5.06
5.08
5.10
0 100 200 300 400 500
0
10
20
30
40
50
60
70
80
90
100
4.90
4.92
4.94
4.96
4.98
5.00
5.02
5.04
5.06
5.08
5.10
4.90
4.92
4.94
4.96
4.98
5.00
5.02
5.04
5.06
5.08
5.10
0 100 200 300 400 500
0
100
200
300
400
500
600
65
℃
OPERATION RANGE
333mA
250mA
75
℃
-40 -20 0 20 40 60 80 100
Vin=10V以下
Vin=12V
Vin=14V
0
200
400
600
800
1000
-40 -20 0 20 40 60 80 100
Vin=12V以下
Vin=14V
OPERATION RANGE
●BP5275-50
Data Sheet
Line Regulation
Output VoltageVo [V]
Ta = 8 0 °C
Ta = 2 5 °C
Ta =−35°C
0246810121416
Intput VoltageVin [V] Output Current Io [ｍＡ]
Output Voltage vs. Input Voltage Fluctuation（Ta=25°C）
Output Voltage vs. Temperature Fluctuation（Vin=12V）
Output Voltage Vo [V]
Ta = 8 0 °C
Ta = 2 5 °C
Ta =−35°C
Power Conversion Efficiency Fluctuation（Ta=25°C）
Output Voltage Vo [V]
Derating Curve (No heat sink)
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© 2011 ROHM Co., Ltd. All rights reserved.
Load Current Io1 [mA]
Ambient Temperature Ta [℃]
Output Current Io [ｍＡ]
Vin= 6V
Vin=12V
Vin=14V
7/7
Power Conversion Efficiencyη[%]
0 100 200 500400300
Output Current Io [ｍＡ]
Derating Curve (With heat sink)
OPERATION RANGE
Load Current Io2 [mA]
Ambient Temperature Ta [℃]
Vin= 6V
Vin=12V
Vin=14V
72
℃
480mA
2011.08 -
Rev. A
Notes
No copying or reproduction of this document, in part or in whole, is permitted without the
consent of ROHM Co.,Ltd.
The content specied herein is subject to change for improvement without notice.
The content specied herein is for the purpose of introducing ROHM's products (hereinafter
"Products"). If you wish to use any such Product, please be sure to refer to the specications,
which can be obtained from ROHM upon request.
Examples of application circuits, circuit constants and any other information contained herein
illustrate the standard usage and operations of the Products. The peripheral conditions must
be taken into account when designing circuits for mass production.
Great care was taken in ensuring the accuracy of the information specied in this document.
However, should you incur any damage arising from any inaccuracy or misprint of such
information, ROHM shall bear no responsibility for such damage.
The technical information specied herein is intended only to show the typical functions of and
examples of application circuits for the Products. ROHM does not grant you, explicitly or
implicitly, any license to use or exercise intellectual property or other rights held by ROHM and
other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the
use of such technical information.
The Products specied in this document are intended to be used with general-use electronic
equipment or devices (such as audio visual equipment, ofce-automation equipment, communication devices, electronic appliances and amusement devices).
The Products specied in this document are not designed to be radiation tolerant.
While ROHM always makes ef forts to enhance the quality and reliability of its Products, a
Product may fail or malfunction for a variety of reasons.
Please be sure to implement in your equipment using the Products safety measures to guard
against the possibility of physical injury, re or any other damage caused in the event of the
failure of any Product, such as derating, redundancy, re control and fail-safe designs. ROHM
shall bear no responsibility whatsoever for your use of any Product outside of the prescribed
scope or not in accordance with the instruction manual.
The Products are not designed or manufactured to be used with any equipment, device or
system which requires an extremely high level of reliability the failure or malfunction of which
may result in a direct threat to human life or create a risk of human injury (such as a medical
instrument, transportation equipment, aerospace machiner y, nuclear-reactor controller, fuelcontroller or other safety device). ROHM shall bear no responsibility in any way for use of any
of the Products for the above special purposes. If a Product is intended to be used for any
such special purpose, please contact a ROHM sales representative before purchasing.
If you intend to export or ship overseas any Product or technology specied herein that may
be controlled under the Foreign Exchange and the Foreign Trade Law, you will be required to
obtain a license or permit under the Law.
Notice
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Thank you for your accessing to ROHM product informations.
More detail product informations and catalogs are available, please contact us.
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R1120
A
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