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Data Sheet
Non-Isolated Step-Down 3-Terminal DC/DC Converters
BP5275-18 / BP5275-25 / BP5275-33 / BP5275-50
4.2
5.2
Dimensions (Unit : mm)
5.2
2xC0.5
2.6
13.8 MAX
C0.5
23.0 MAX
20.3
4.0±1.0
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).
0.75
1.3
2.54±0.2
2.54±0.2
0.5
Pin No.1 2 3
Note : Dimensions without tolerance is typical.
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
List of the series
Input voltage
Output voltage
Maximum output current
(no heat sink / include heat sink)
Power conversion
efficiency (Vin=12V)
BP5275−18
BP5275−25
BP5275−33
BP5275−50
Unit
4.5 to 14
4.5 to 14
5.0 to 14
6.0 to 14
V
1.8
2.5
3.3
5.0
V
500 / 800
500 / 800
500 / 800
500 / 800
mA
73
78
83
88
%
BP5275−18
BP5275−25
Absolute maximum ratings (Ta=25°C)
Parameter
Input voltage
Operating temperature range
Symbol
Limits
BP5275−33
BP5275−50
Unit
VIn
15
15
15
15
V
Topr
−30 to 85
−30 to 85
−30 to 85
−30 to 85
°C
Tstg
−40 to 105
−40 to 105
−40 to 105
−40 to 105
°C
Allowable maximum surface temperature
Tcmax
100
100
100
100
°C
Maximum output current 1
IO1max
500
500
500
500
°C
Maximum output current 2 (with Heat Sink)
IO2max
800
800
800
800
°C
Storage temperature range
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© 2011 ROHM Co., Ltd. All rights reserved.
1/7
2011.08 - Rev. A
BP5275-18 / BP5275-25 / BP5275-33 / BP5275-50
Block diagram
Data Sheet
Measurement circuit
1 2 3
Control
Circuit
Io
Vin
A
A
V
Vin
V
Vout
V
GND
GND
Electrical characteristics
BP5275−18 (Unless otherwise noted : Ta=25°C, Vin=12V, lo1=500mA)
Parameter
Symbol
Min.
Typ.
Max.
Unit
Vin
4
12
14
V
DC
Output voltage
VO
1.75
1.80
1.85
V
IO1=0mA
Output current 1
IO1
0

500
mA
Output current 2
IO2

800
mA
Vin=4 to 14V
IO=0 to 500mA
Input voltage
Line regulation
Vr
0

5
50
mV
Load regulation
Vl

10
50
mV
Output ripple voltage
Vp

5
80
mVP-P
Minimum start-up time
Ts
4
7

msec
Conversion efficiency

65
73

%
Operation frequency
f

1.5

MHz
Max.
Unit
Conditions
1
1
With heat sink
Vin=0V
3V,Ro=3.6Ω
1 Derating required according to the input voltage and ambient temperature.
BP5275-25 (Unless otherwise noted : Ta=25°C, Vin=12V, lo1=500mA)
Parameter
Symbol
Min.
Typ.
Conditions
Input voltage
Vin
4
12
14
V
DC
Output voltage
VO
2.45
2.50
2.55
V
IO1=0mA
Output current 1
IO1
0

500
mA
Output current 2
IO2

800
mA
With heat sink
Line regulation
Vr
0

5
50
mV
Vin=4 to 14V
Load regulation
Vl

10
50
mV
IO1=0 to 500mA
Output ripple voltage
Vp

5
50
mVP-P
Minimum start-up time
Ts
4
7

msec
Conversion efficiency

73
78

%
Operation frequency
f

1.5

MHz
1
Vin=3V
1
4V,Ro=5Ω
1 Derating required according to the input voltage and ambient temperature.
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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
Data Sheet
Electrical characteristics
BP5275−33 (Unless otherwise noted :Ta=25°C, Vin=12V, lo1=500mA)
Parameter
Symbol
Min.
Typ.
Max.
Unit
Conditions
12
14
V
DC
IO1=0mA
Input voltage
Vin
4.5
Output voltage
VO
3.23
3.30
3.37
V
0

500
mA

800
mA
With heat sink
mV
Vin=4.5 to 14V
IO=0 to 500mA
Output current 1
IO1
Output current 2
IO2
Line regulation
Vr
0

5
50
Load regulation
Vl

10
50
mV
Output ripple voltage
Vp

5
50
mVP-P
Minimum start-up time
Ts
4
7

msec
Conversion efficiency

78
83

%
Operation frequency
f

1.5

MHz
Max.
Unit
1
Vin=3V
1
4.5V,Ro=6.6Ω
1 Derating required according to the input voltage and ambient temperature.
BP5275-50 (Unless otherwise noted : Ta=25°C, Vin=12V, lo1=500mA)
Parameter
Symbol
Min.
Typ.
Conditions
Input voltage
Vin
6
12
14
V
DC
Output voltage
VO
4.9
5.0
5.1
V
IO1=0mA
0

500
mA

800
mA
With heat sink
Output current 1
IO1
1
Output current 2
IO2
Line regulation
Vr
0

5
50
mV
Vin=6 to 14V
Load regulation
Vl

10
50
mV
IO1=0 to 500mA
Output ripple voltage
Vp

5
50
mVP-P
Minimum start-up time
Ts
4
7

msec
Conversion efficiency

83
88

%
Operation frequency
f

1.5

MHz
Vin=3V
1
6V,Ro=10Ω
1 Derating required according to the input voltage and ambient temperature.
●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
Data Sheet
●BP5275-18
Output Voltage vs. Temperature Fluctuation(Vin=12V)
1.85
1.85
1.84
1.84
1.83
1.83
Output Voltage Vo [V]
Output Voltage Vo [V]
Line Regulation
1.82
1.81
1.80
1.79
1.78
1.82
1.81
1.80
1.79
1.78
Ta= 80°C
1.77
Ta= 25°C
1.76
Ta= 80°C
1.77
Ta= 25°C
1.76
Ta=−35°C
Ta=−35°C
1.75
0
2
4
6
8
10
12
14
1.75
16
0
100
Intput Voltage Vin [V]
100
1.84
90
Power Conversion Efficiencyη[%]
1.85
Output Voltage Vo [V]
1.83
1.82
1.81
1.80
1.79
1.78
Vin= 6V
Vin=12V
1.76
80
70
60
50
40
30
Vin= 6V
20
Vin=12V
10
Vin=14V
Vin=14V
1.75
0
0
100
200
300
400
Output Current Io [mA]
500
0
100
Vin=10V以下
Vin=12V
Vin=14V
600
500
76℃
Load Current Io2 [mA]
800
400
333mA
300
OPERATION
R
R
RANGE
Vin=12V以下
Vin=14V
1000
65℃ 75℃
500
200
300
400
Output Current Io [mA]
Derating Curve (With heat sink)
Derating Curve (No heat sink)
Load Current Io1 [mA]
500
Power Conversion Efficiency Fluctuation(Ta=25°C)
Output Voltage vs. Input Voltage Fluctuation(Ta=25°C)
1.77
200
300
400
Output Current Io [mA]
250mA
200
100
600
550mA
OPERATION RANGE
400
200
0
0
-40
-20
0
20
40
60
80
-40
100
0
20
40
60
80
100
Ambient Temperature Ta [°C]
Ambient Temperature Ta [°C]
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© 2011 ROHM Co., Ltd. All rights reserved.
-20
4/7
2011.08 - Rev. A
BP5275-18 / BP5275-25 / BP5275-33 / BP5275-50
Data Sheet
●BP5275-25
Output Voltage vs. Temperature Fluctuation(Vin=12V)
2.55
2.54
2.54
2.53
2.53
Output Voltage Vo [V]
Output Voltage Vo [V]
Line Regulation
2.55
2.52
2.51
2.50
2.49
2.48
2.52
2.51
2.50
2.49
2.48
Ta= 80°C
2.47
Ta=−35°C
0
2
4
6
8
10
12
14
Ta= 25°C
2.46
2.46
2.45
Ta= 80°C
2.47
Ta= 25°C
Ta=−35°C
2.45
16
0
100
Intput Voltage Vin [V]
Output Voltage vs. Input Voltage Fluctuation(Ta=25°C)
2.54
90
Power Conversion Efficiencyη[%]
100
Output Voltage Vo [V]
2.53
2.52
2.51
2.50
2.49
2.48
Vin= 6V
Vin=12V
2.46
80
70
60
50
40
30
Vin= 6V
20
Vin=12V
10
Vin=14V
Vin=14V
2.45
0
0
100
200
300
400
Output Current Io [mA]
0
500
100
400
500
74℃
Load Current Io2 [mA]
800
400
333mA
300
OPERATION
R
RANGE
R
Vin=12V以下
Vin=14V
1000
65℃ 75℃
500
300
Derating Curve (With heat sink)
Vin=10V以下
Vin=12V
Vin=14V
600
200
Output Current Io [mA]
Derating Curve (No heat sink)
Load Current Io1 [mA]
500
Power Conversion Efficiency Fluctuation(Ta=25°C)
2.55
2.47
200
300
400
Output Current Io [mA]
250mA
200
100
600
528mA
OPERATION RANGE
400
200
0
0
-40
-20
0
20
40
60
80
-40
100
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© 2011 ROHM Co., Ltd. All rights reserved.
-20
0
20
40
60
80
100
Ambient Temperature Ta [℃]
Ambient Temperature Ta [℃]
5/7
2011.08 - Rev. A
BP5275-18 / BP5275-25 / BP5275-33 / BP5275-50
Data Sheet
●BP5275-33
Output Voltage vs. Temperature Fluctuation(Vin=12V)
3.40
3.40
3.38
3.38
3.36
3.36
Output Voltage Vo [V]
Output Voltage Vo [V]
Line Regulation
3.34
3.32
3.30
3.28
3.26
Ta= 80°C
3.24
3.34
3.32
3.30
3.28
3.26
Ta= 80°C
3.24
Ta= 25°C
Ta= 25°C
3.22
3.22
Ta=−35°C
Ta=−35°C
3.20
3.20
0
2
4
6
8
10
12
14
16
0
100
Intput Voltage Vin [V]
Output Voltage vs. Input Voltage Fluctuation(Ta=25°C)
3.40
100
3.38
90
Power Conversion Efficiencyη[%]
Output Voltage Vo [V]
300
400
500
Power Conversion Efficiency Fluctuation(Ta=25°C)
3.36
3.34
3.32
3.30
3.28
3.26
Vin= 6V
3.24
Vin=12V
3.22
Vin=14V
80
70
60
50
40
30
Vin= 6V
20
Vin=12V
10
Vin=14V
3.20
0
0
100
200
300
400
0
500
100
Output Current Io [mA]
400
500
73℃
Load Current Io2 [mA]
800
400
333mA
300
OPERATION
R
RANGE
R
Vin=12V以下
Vin=14V
1000
65℃ 75℃
500
300
Derating Curve (With heat sink)
Vin=10V以下
Vin=12V
Vin=14V
600
200
Output Current Io [mA]
Derating Curve (No heat sink)
Load Current Io1 [mA]
200
Output Current Io [mA]
250mA
200
100
600
505mA
OPERATION RANGE
400
200
0
0
-40
-20
0
20
40
60
80
-40
100
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© 2011 ROHM Co., Ltd. All rights reserved.
-20
0
20
40
60
80
100
Ambient Temperature Ta [℃]
Ambient Temperature Ta [℃]
6/7
2011.08 - Rev. A
BP5275-18 / BP5275-25 / BP5275-33 / BP5275-50
Data Sheet
●BP5275-50
Line Regulation
Output Voltage vs. Temperature Fluctuation(Vin=12V)
5.10
5.08
5.08
5.06
5.06
Output Voltage Vo [V]
Output Voltage Vo [V]
5.10
5.04
5.02
5.00
4.98
4.96
Ta= 80°C
4.94
5.02
5.00
4.98
4.96
Ta= 80°C
4.94
Ta= 25°C
4.92
5.04
Ta= 25°C
4.92
Ta=−35°C
Ta=−35°C
4.90
4.90
0
2
4
6
8
10
12
14
16
0
100
Intput Voltage Vin [V]
100
5.08
90
Power Conversion Efficiencyη[%]
5.10
Output Voltage Vo [V]
5.06
5.04
5.02
5.00
4.98
4.96
Vin= 6V
Vin=12V
4.92
Vin=14V
80
70
60
50
40
30
Vin= 6V
20
Vin=12V
10
Vin=14V
4.90
0
0
100
200
300
400
Output Current Io [mA]
500
0
100
400
500
72℃
Load Current Io2 [mA]
800
400
333mA
300
OPERATION
R
RANGE
R
Vin=12V以下
Vin=14V
1000
65℃ 75℃
500
300
Derating Curve (With heat sink)
Vin=10V以下
Vin=12V
Vin=14V
600
200
Output Current Io [mA]
Derating Curve (No heat sink)
Load Current Io1 [mA]
500
Power Conversion Efficiency Fluctuation(Ta=25°C)
Output Voltage vs. Input Voltage Fluctuation(Ta=25°C)
4.94
200
300
400
Output Current Io [mA]
250mA
200
100
600
480mA
OPERATION RANGE
400
200
0
0
-40
-20
0
20
40
60
80
-40
100
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© 2011 ROHM Co., Ltd. All rights reserved.
-20
0
20
40
60
80
100
Ambient Temperature Ta [℃]
Ambient Temperature Ta [℃]
7/7
2011.08 - Rev. A
Notice
Notes
No copying or reproduction of this document, in part or in whole, is permitted without the
consent of ROHM Co.,Ltd.
The content specified herein is subject to change for improvement without notice.
The content specified 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 specifications,
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 specified 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 specified 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 specified in this document are intended to be used with general-use electronic
equipment or devices (such as audio visual equipment, office-automation equipment, communication devices, electronic appliances and amusement devices).
The Products specified in this document are not designed to be radiation tolerant.
While ROHM always makes efforts 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, fire or any other damage caused in the event of the
failure of any Product, such as derating, redundancy, fire 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 machinery, 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 specified herein that may
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More detail product informations and catalogs are available, please contact us.
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R1120A
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