www.murata-ps.com
Dual Output BST Models
Low-Cost, High Reliability 3 Watt, DC/DC Converters
Typical units
FEATURES
Lowest cost! Highest reliability!
100% SMT-on-pcb, including magnetics
100% automatically assembled
Standard "DIP" package and pinouts
isolated, 1000Vdc guaranteed
Fully
±12 or ±15 Volt outputs
±5,
Choice of 3 wide-range inputs:
4.5-9 Volts
9-18 Volts
18-72 Volts
Guaranteed efficiencies to 75%
–40 to +75°C full-power operation
Internal input/output filtering
UL1950/C22.2 No. 950/IEC950-1 certified
PRODUCT OVERVIEW
Rarely, has a Series of low-power DC/DC converters
been defined by both low cost and Murata’s quality
and reliability. Our new BST Series of dual-output
3W DC/DC’s achieves this “best-of-both-worlds”
status by implementing a proven circuit architecture
(170-200kHz flyback design) as a full, SMT-on-pcb
assembly (including surface-mount magnetics) that is
truly 100% automatically assembled. Packaged in min-
iature 1.25" x 0.8", DIP-like plastic packages (UL94V-0
rated) and requiring no external components, BST
Series DC/DC’s bring true component-like convenience
to designers of today’s distributed power systems.
Output voltages are ±5, ±12 or ±15 Volts. Input
voltage ranges are 4.5-9V (“D5” models), 9-18V
(“D12” models) or an ultra-wide 18-72V (“D48”
models). BST DC/DC’s are fully isolated (1000Vdc
guaranteed) and include input (pi type) and output
filters within their package. Output transient response
is a quick 200μsec, while output ripple and noise are
typically 75mVp-p.
These rugged modules are fully encapsulated
with a thermally conductive potting compound that
contributes to their outstanding moisture/vibration
resistance and impressive MTBF. They operate over
the full –40 to +75°C temperature range without der-
ating. All models have been thoroughly characterized
(electrically, mechanically and thermally), qualified
(including HALT), and EMI/EMC tested. Additionally,
they are certified to UL1950, CSA 22.2 No. 950 and
IEC950.
Murata’s BST Model 3W DC/DC’s are excellent
selections for telecom/datacom, computer and
process-control applications demanding small size,
low cost and high reliability. If required, their design
“flexibility” allows for easy modification to your
application-specific requirements.
+V
IN
+V
OUT
COMMON
–V
OUT
–V
IN
PWM
CONTROLLER
OPTO
ISOLATION
REFERENCE &
ERROR AMP
Typical topology is shown.
Figure 1. Simplified Schematic
For full details go to
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MDC_BST 3W Models.C01
Page 1 of 4
Dual Output BST Models
Low-Cost, High Reliability 3 Watt, DC/DC Converters
Performance Specifications and Ordering Guide
➀
ORDERING GUIDE SUMMARY
Output
V
OUT
(Volts)
±5
±5
±12
±12
±15
±15
±12
±15
I
OUT
(mA Max.)
±250
±250
±125
±125
±100
±100
±105
±85
R/N (mV pk-pk)
➁
Typ.
Max.
75
75
75
75
75
75
75
75
120
120
150
150
150
150
150
150
Regulation (Max.)
Line
Load
➂
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
Input
V
IN
Nom. Range
(Volts) (Volts)
12
48
12
48
12
48
5
5
9-18
18-72
9-18
18-72
9-18
18-72
4.5-9
4.5-9
I
IN
➃
(mA)
25/267
7/69
25/329
8/81
25/329
8/81
60/690
68/689
Efficiency
Min.
Typ.
75%
72%
74%
73%
74%
73%
71%
72%
78%
76%
76%
77%
76%
77%
73%
74%
Package
(Case,
Pinout)
C1,P2
C1,P2
C1,P2
C1,P2
C1,P2
C1,P2
C1,P2
C1,P2
Models
BST-5/250-D12-C
BST-5/250-D48-C
BST-12/125-D12-C
BST-12/125-D48-C
BST-15/100-D12-C
BST-15/100-D48-C
BST-12/105-D5-C
BST-15/85-D5-C
➀
➁
➂
➃
Typical at TA = +25°C under nominal line voltage and full-load conditions unless otherwise noted.
Ripple/Noise (R/N) measured over a 20 MHz bandwidth.
Balanced loads, 10% to 100% load.
Nominal line voltage, no-load/full-load conditions.
PAR
PAR
PART NUMBER STRUCTURE
MECHANICAL SPECIFICATIONS
1.25
(31.75)
STANDOFFS
0.025
(0.64)
B ST
-
15
/
100
-
D48
-
C
Output Configuration:
B
= Bipolar
Product Series
Nominal Output Voltages:
±5, ±12 or ±15 Volts
Input Voltage Range:
D5
= 4.5-9 Volts (5V nominal)
D12
= 9-18 Volts (12V nominal)
D48
= 18-72 Volts
Maximum Output Current
(48V nominal)
in mA from each output
RoHS-6 Hazardous
Substance Compliance
(does not claim EU RoHS
exemption 7b – lead in solder)
0.45
(11.43)
Case C1
0.020 ±0.002 DIA.
(0.508 ±0.051)
0.600
(15.24)
0.200
(5.08)
0.100
(2.54)
0.18
(4.57)
0.15 MIN
(3.81)
PAR
TEMPERATURE DERATING
Output Power vs. Ambient Temperature
V
IN
Nominal, Natural Convection
3.5
3 4
7
8
0.600
(15.24)
0.80
(20.32)
1 2
5
6
BOTTOM VIEW
3
PLASTIC CASE WITH AN INSULATED BASE
0.10
(2.54)
Output Power (Watts)
2.5
DIMENSIONS ARE IN INCHES (MM)
2
I/O Connections
Pin
Function P2
+Input
+Input
–Input
–Input
Common
+Output
Common
–Output
1
2
3
4
5
6
7
8
Dimensions are in inches (mm shown for ref. only).
Third Angle Projection
1.5
1
0.5
0
–40
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
Components are shown for reference only.
0
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95 100
Ambient Temperature (
˚
C)
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MDC_BST 3W Models.C01
Page 2 of 4
Dual Output BST Models
Low-Cost, High Reliability 3 Watt, DC/DC Converters
Performance/Functional Specifications
Input
Input Voltage Range:
"D5" Models
"D12" Models
"D48" Models
Input Current
Input Filter Type
Reverse-Polarity Protection
4.5-9 Volts (5V nominal)
9-18 Volts (12V nominal)
18-72 Volts (48V nominal)
See Ordering Guide
Pi
Yes (Instantaneous, 2A maximum)
Output Overvoltage Protection
Output Current
Input Voltage:
"D5" Models
"D12" Models
"D48" Models
Input Reverse-Polarity Protection
12 Volts
20 Volts
80 Volts
Current must be <2A. Brief duration
only. Fusing recommended.
None
Maximum current and short-circuit
duration are model dependent. “D12”
and “D48” models can withstand
sustained output short circuits.
–55 to +100°C
+280°C
Typical @ T
A
= +25°C under nominal line voltage and full-load conditions unless noted.
➀
Absolute Maximum Ratings
Output
V
OUT
Accuracy
(50% load)
Temperature Coefficient
Ripple/Noise
(20MHz BW)
Line/Load Regulation
Efficiency
Isolation Voltage
Short Circuit Protection:
➁
“D5” Models
“D12” and “D48” Models
±1%, maximum
±0.02% per °C
See Ordering Guide
See Ordering Guide
See Ordering Guide
1000Vdc, minimum
Power-limiting technique, auto-recovery
Hiccup technique, auto-recovery
Storage Temperature
Lead Temperature
(soldering, 10 sec.)
These are stress ratings. Exposure of devices to greater than any
of these conditions may adversely affect long-term reliability. Proper
operation under conditions other than those listed in the Performance/
Functional Specifications Table is not implied or recommended.
PAR
Dynamic Characteristics
Transient Response
(50% load step)
Switching Frequency:
“D48” Models
“D5” and “D12” Models
200µsec to ±1.5% of final value
200kHz
170kHz
TECHNICAL NOTES
Environmental
Operating Temperature
(Ambient, no derating)
Storage Temperature
–40 to +75°C
– 55 to +100°C
Floating Outputs
Since these are isolated DC/DC converters, their outputs are “floating.” Any
BST model may be configured to produce an output of 10V, 24V or 30V (for
±5V, ±12V or ±15V models, respectively) by applying the load across the
+Output (pin 6) and –Output (pin 8), with either output grounded. The Common
(pins 5 and 7) should be left open (unconnected). Minimum 20% loading is
recommended under these conditions.
Filtering and Noise Reduction
All BST 3 Watt DC/DC Converters achieve their rated ripple and noise specifica-
tions without the use of external input/output capacitors. In critical applications,
input/output ripple and noise may be further reduced by installing electrolytic
capacitors across the input terminals and/or low-ESR tantalum or electrolytic
capacitors across the output terminals. Output capacitors should be con-
nected between their respective output pin (pins 6 and 8) and Common (pins 5
and 7) as shown in Figure 2. The caps should be located as close to the power
converters as possible. Typical values are listed in the tables below. In many
applications, using values greater than those listed will yield better results.
To Reduce Input Ripple
"D5" Models
"D12" Models
"D48" Models
To Reduce Output Ripple
±5V Outputs
±12/15V Outputs
47μF, 10V, Low ESR
22μF, 20V, Low ESR
47μF, 15V
10μF, 35V
4.7μF, 100V
Physical
Dimensions
Case Material
Pin Material
Weight
1.25" x 0.8" x 0.45" (31.8 x 20.3 x 11.4mm)
Diallyl phthalate, UL94V-0 rated
Gold-plated copper alloy with nickel
underplate
0.5 ounces (14.2 grams)
➀
These power converters require a minimum 10% loading to maintain specified regulation.
Operation under no-load conditions will not damage these devices; however they may not
meet all listed specifications.
➁
The current limit inception point is dependent on the input voltage. Therefore, it is possible
to draw current beyond the rated capacity. Users should fully characterize their load conditions.
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MDC_BST 3W Models.C01
Page 3 of 4
Dual Output BST Models
Low-Cost, High Reliability 3 Watt, DC/DC Converters
+OUTPUT
1, 2
+INPUT
+
C
IN
3, 4
–INPUT
COMMON
6
+
C
OUT
5, 7
+
C
OUT
8
Custom Capabilities
MPS’s world-class design, development and manufacturing team stands
ready to work with you to deliver the exact power converter you need for your
demanding, large volume, OEM applications. And ... we’ll do it on time and
within budget!
Our experienced applications and design staffs; quick-turn prototype capa-
bility; highly automated, SMT assembly facilities; and in-line SPC quality-control
techniques combine to give us the unique ability to design and deliver any
quantity of power converters to the highest standards of quality and reliability.
We have compiled a large library of DC/DC designs that are currently used
in a variety of telecom, medical, computer, railway, aerospace and industrial
applications. We may already have the converter you need.
Contact us. Our goal is to provide you the highest-quality, most cost-effective
power converters available.
–OUTPUT
Figure 2. Using External Capacitors to Reduce Input/Output Ripple/Noise
Input Fusing
Certain applications and/or safety agencies may require the installation of
fuses at the inputs of power conversion components. For MPS’s BST 3 Watt
DC/DC Converters, you should use fast-blow type fuses with values no greater
than the following:
V
IN
Range
"D5"
"D12"
"D48"
Fuse Value
1.5A
1A
0.5A
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
This product is subject to the following operating requirements
and the Life and Safety Critical Application Sales Policy:
Refer to:
http://www.murata-ps.com/requirements/
Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other
technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply
the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without
notice.
© 2014 Murata Power Solutions, Inc.
www.murata-ps.com/support
MDC_BST 3W Models.C01
Page 4 of 4
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