FEATURES
Lowest cost! Highest reliability!
100% SMT-on-pcb, including magnetics
100% automatically assembled
Standard "DIP" package and pinouts
Fully isolated, 1000Vdc guaranteed
±5, ±12 or ±15 Volt outputs
Choice of 3 wide-range inputs:
4.5-9 Volts
9-18 Volts
18-72 Volts
Guaranteed effi ciencies to 75%
–40 to +75°C full-power operation
Internal input/output fi ltering
UL1950/C22.2 No. 950/IEC950-1 certifi ed
+V
IN
–V
IN
+V
OUT
–V
OUT
COMMON
REFERENCE &
ERROR AMP
OPTO
ISOLATION
PWM
CONTROLLER
Figure 1. Simplifi ed Schematic
Typical topology is shown.
Rarely, has a Series of low-power DC/DC converters
been defi ned 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 fl yback 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
fi lters 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), qualifi ed
(including HALT), and EMI/EMC tested. Additionally,
they are certifi ed 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
“fl exibility” allows for easy modifi cation to your
application-specifi c requirements.
Typical units
PRODUCT OVERVIEW
Dual Output BST Models
Low-Cost, High Reliability 3 Watt, DC/DC Converters
MDC_BST 3W Models.C01 Page 1 of 4
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For full details go to
www.murata-ps.com/rohs
0.020 ±0.002 DIA.
(0.508 ±0.051)
STANDOFFS
0.025
(0.64)
0.45
(11.43)
1.25
(31.75)
BOTTOM VIEW
PLASTIC CASE WITH AN INSULATED BASE
12
34
56
87
0.200
(5.08)
0.18
(4.57)
0.100
(2.54)
0.10
(2.54)
0.80
(20.32)
0.600
(15.24)
0.600
(15.24)
0.15 MIN
(3.81)
DIMENSIONS ARE IN INCHES
(
MM
)
Case C1
Performance Specifi cations and Ordering Guide➀
PAR
PART NUMBER STRUCTURE
Input Voltage Range:
D5 = 4.5-9 Volts (5V nominal)
D12 = 9-18 Volts (12V nominal)
D48 = 18-72 Volts (48V nominal)
Nominal Output Voltages:
±5, ±12 or ±15 Volts Maximum Output Current
in mA from each output
Product Series
Output Confi guration:
B = Bipolar
15B ST 100 D48
-/ -
I/O Connections
Pin Function P2
1 +Input
2 +Input
3 –Input
4 –Input
5 Common
6 +Output
7 Common
8 –Output
Output Power (Watts)
Ambient Temperature (
˚
C)
–40 0 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
3.5
3
2.5
2
1.5
1
0.5
0
Output Power vs. Ambient Temperature
V
IN
Nominal, Natural Convection
ORDERING GUIDE SUMMARY
Models
Output Input
Effi ciency
Package
(Case,
Pinout)
VOUT
(Volts)
IOUT
(mA Max.)
R/N (mV pk-pk)➁Regulation (Max.) VIN Nom.
(Volts)
Range
(Volts)
IIN➃
(mA)Typ. Max. Line Load➂Min. Typ.
BST-5/250-D12-C ±5 ±250 75 120 ±0.5% ±0.5% 12 9-18 25/267 75% 78% C1,P2
BST-5/250-D48-C ±5 ±250 75 120 ±0.5% ±0.5% 48 18-72 7/69 72% 76% C1,P2
BST-12/125-D12-C ±12 ±125 75 150 ±0.5% ±0.5% 12 9-18 25/329 74% 76% C1,P2
BST-12/125-D48-C ±12 ±125 75 150 ±0.5% ±0.5% 48 18-72 8/81 73% 77% C1,P2
BST-15/100-D12-C ±15 ±100 75 150 ±0.5% ±0.5% 12 9-18 25/329 74% 76% C1,P2
BST-15/100-D48-C ±15 ±100 75 150 ±0.5% ±0.5% 48 18-72 8/81 73% 77% C1,P2
BST-12/105-D5-C ±12 ±105 75 150 ±0.5% ±0.5% 5 4.5-9 60/690 71% 73% C1,P2
BST-15/85-D5-C ±15 ±85 75 150 ±0.5% ±0.5% 5 4.5-9 68/689 72% 74% C1,P2
➀ Typical at TA = +25°C under nominal line voltage and full-load conditions unless otherwise noted.
➁ Ripple/Noise (R/N) measured over a 20 MHz bandwidth.
➂ Balanced loads, 10% to 100% load.
➃ Nominal line voltage, no-load/full-load conditions.
PAR
TEMPERATURE DERATING
PAR
MECHANICAL SPECIFICATIONS
C
-
RoHS-6 Hazardous
Substance Compliance
(does not claim EU RoHS
exemption 7b – lead in solder)
Third Angle Projection
Dimensions are in inches (mm shown for ref. only).
Components are shown for reference only.
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
Dual Output BST Models
Low-Cost, High Reliability 3 Watt, DC/DC Converters
MDC_BST 3W Models.C01 Page 2 of 4
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Performance/Functional Specifi cations
Typical @ TA = +25°C under nominal line voltage and full-load conditions unless noted. ➀
➀ These power converters require a minimum 10% loading to maintain specifi ed regulation.
Operation under no-load conditions will not damage these devices; however they may not
meet all listed specifi cations.
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.
Input
Input Voltage Range:
"D5" Models 4.5-9 Volts (5V nominal)
"D12" Models 9-18 Volts (12V nominal)
"D48" Models 18-72 Volts (48V nominal)
Input Current See Ordering Guide
Input Filter Type Pi
Reverse-Polarity Protection Yes (Instantaneous, 2A maximum)
Output
VOUT Accuracy (50% load) ±1%, maximum
Temperature Coeffi cient ±0.02% per °C
Ripple/Noise (20MHz BW) See Ordering Guide
Line/Load Regulation See Ordering Guide
Effi ciency See Ordering Guide
Isolation Voltage 1000Vdc, minimum
Short Circuit Protection: ➁
“D5” Models Power-limiting technique, auto-recovery
“D12” and “D48” Models Hiccup technique, auto-recovery
Dynamic Characteristics
Transient Response (50% load step) 200µsec to ±1.5% of fi nal value
Switching Frequency:
“D48” Models 200kHz
“D5” and “D12” Models 170kHz
Environmental
Operating Temperature
(Ambient, no derating) –40 to +75°C
Storage Temperature – 55 to +100°C
Physical
Dimensions 1.25" x 0.8" x 0.45" (31.8 x 20.3 x 11.4mm)
Case Material Diallyl phthalate, UL94V-0 rated
Pin Material Gold-plated copper alloy with nickel
underplate
Weight 0.5 ounces (14.2 grams)
Input Voltage:
"D5" Models 12 Volts
"D12" Models 20 Volts
"D48" Models 80 Volts
Input Reverse-Polarity Protection Current must be <2A. Brief duration
only. Fusing recommended.
Output Overvoltage Protection None
Output Current Maximum current and short-circuit
duration are model dependent. “D12”
and “D48” models can withstand
sustained output short circuits.
Storage Temperature –55 to +100°C
Lead Temperature (soldering, 10 sec.) +280°C
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 Specifi cations Table is not implied or recommended.
Absolute Maximum Ratings
Floating Outputs
Since these are isolated DC/DC converters, their outputs are “fl oating.” Any
BST model may be confi gured 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 specifi ca-
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 (pins5
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 47μF, 15V
"D12" Models 10μF, 35V
"D48" Models 4.7μF, 100V
To Reduce Output Ripple
±5V Outputs 47μF, 10V, Low ESR
±12/15V Outputs 22μF, 20V, Low ESR
PAR
TECHNICAL NOTES
Dual Output BST Models
Low-Cost, High Reliability 3 Watt, DC/DC Converters
MDC_BST 3W Models.C01 Page 3 of 4
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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 Fuse Value
"D5" 1.5A
"D12" 1A
"D48" 0.5A
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.
Figure 2. Using External Capacitors to Reduce Input/Output Ripple/Noise
+INPUT
+OUTPUT
–OUTPUT
COMMON
–INPUT
1, 2
5, 7
3, 4
6
8
C
IN
C
C
OUT
OUT
+
+
+
Dual Output BST Models
Low-Cost, High Reliability 3 Watt, DC/DC Converters
MDC_BST 3W Models.C01 Page 4 of 4
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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. Specifi cations are subject to change without
notice. © 2014 Murata Power Solutions, Inc.
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfi eld, 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/
