www.murata-ps.com
UEI15 Series
Isolated Wide Input Range 15-Watt DC/DC Converters
Featuring a full 15 Watt or greater output in one square inch of board area, the UEI
series isolated DC/DC converter family offers efficient regulated DC power for printed
circuit board mounting.
Typical unit
FEATURES
Small footprint DC/DC converter, ideal for
high current applications
Industry standard 0.96" x 1.1" X 0.32" open
frame package and pinout
Wide range input voltages 9-36 and 18-75 Vdc
Assembly and attachment for RoHS standards
Isolation up to 2250 VDC (basic)
Up to 15 Watts or greater total output power
with overtemperature shutdown
High efficiency synchronous rectifier forward
topology
Stable operation with no required external
components
Usable -40 to 85°C temperature range (with
derating)
Certified to UL 60950-1, CAN/CSA-C22.2 No.
60950-1, IEC60950-1, EN60950-1 safety ap-
provals, 2nd edition
Extensive self-protection shut down features
PRODUCT OVERVIEW
Wide range 4:1 inputs on the 0.96" x 1.1" x 0.32"
converter are either 9 to 36 Volts DC (Q12 models)
or 18 to 75 Volts DC (Q48 models), ideal for battery-
powered and telecom equipment. The industry-
standard pinout fits larger 1" x 2" converters. Fixed
output voltages from 3.3 VDC to 15 VDC are regu-
lated to within ±0.2% or less and may be trimmed
within ±10% of nominal output. Applications
include small instruments, area-limited microcon-
trollers, computer-based systems, data communi-
cations equipment, remote sensor systems, vehicle
and portable electronics.
The UEI 15W series includes full magnetic and
optical isolation up to 2250 Volts DC (basic insula-
tion). For connection to digital systems, the outputs
offer fast settling to current step loads and toler-
ance of higher capacitive loads. Excellent ripple
and noise specifications assure compatibility to
circuits using CPU’s, ASIC’s, programmable logic
and FPGA’s. For systems requiring controlled
startup/shutdown, an external switch, transis-
tor or digital logic may be used to activate the
remote On/Off control.
A wealth of self-protection features avoid both
converter and external circuit problems. These
include input undervoltage lockout and overtem-
perature shutdown. The outputs current limit using
the “hiccup” autorestart technique and the outputs
may be short-circuited indefinitely. Additional
features include output overvoltage and reverse
conduction elimination.
The high efficiency offers minimal heat buildup
and “no fan” operation.
+V
OUT
+V
IN
–V
OUT
On/Off
Control
Control
GATE DRIVE
ISOLATION BARRIER
−V
IN
ISOLATION
Reference, Trim &
Error Amplifier
TRIM
Figure 1. Simplified block diagram—3.3V and 5V
OUT
models only.
Typical topology is shown.
For full details go to
www.murata-ps.com/rohs
REG.-Nr. D806
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MDC_UEI15W.C11
Page 1 of 17
UEI15 Series
Isolated Wide Input Range 15-Watt DC/DC Converters
PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE
➀
Output
R/N (mVp-p)
➁
Regulation (Max.)
Root Models
➀
UEI15-033-Q12
UEI15-033-Q48
UEI15-050-Q12
UEI15-050-Q48
UEI15-120-Q12
UEI15-120-Q48
UEI15-150-Q12
UEI15-150-Q48
V
OUT
I
OUT
Power
(V) (A)
(W)
3.3
3.3
5
5
12
12
15
15
4.5
5
3
3
1.3
1.3
1.1
1.1
14.85
16.5
15
15
15.6
15.6
16.5
16.5
Input
I
IN
=
no
V
IN
Nom. Range load
(V)
(V) (mA)
24
48
24
48
24
48
24
48
9-36
18-75
9-36
18-75
9-36
18-75
9-36
18-75
43
24
41
28
15
15
18
14
I
IN
=
full
load
(A)
0.71
0.4
0.72
0.36
0.77
0.38
0.81
0.4
Efficiency
Open Frame
Package – C75
Case
Pinout
Typ.
60
60
70
60
110
85
130
80
Max.
90
90
125
95
150
120
175
120
Line
±0.05%
±0.2%
±0.05%
±0.05%
±0.05%
±0.05%
Load
±0.1%
±0.2%
±0.06%
±0.05%
±0.05%
±0.05%
Min.
86.5%
85.5%
Typ.
89%
88%
(inches)
(mm)
±0.05% ±0.075%
86.3% 87.3%
84.3% 86.0%
82.3% 84.5%
83.3%
83.5%
85%
85%
1.1×0.96×0.32
27.9×24.4×8.1
P85
±0.0 75% ±0.05%
83.3% 85.3%
➀
Please refer to the part number structure for additional options and complete
ordering part numbers.
➁
All specifications are typical at nominal line voltage and full load, +25 deg.C. unless
otherwise noted. See detailed specifications.
PART NUMBER STRUCTURE
➂
Minimum output load for all models is 10% of maximum current.
➃
RoHS-6 compliance does not claim EU RoHS exemption 7b (lead in solder).
UEI15
-
033
-
Q12
Unipolar Wide Input
15-Watt Series
Nominal Output Voltage
in Tenths of a Volt
P M H Lx
-
C
RoHS-6 Hazardous
Substance Compliance (note 4)
Pin Length Option
Blank
= Std. pin length 0.25˝ (6.3mm)
L1
= 0.110˝ (2.79mm)*
L2
= 0.145˝ (3.68mm)*
Conformal Coating Option
Blank = No coating, standard
H = Coating added, optional
(Built to order; contact Murata Power Solutions for MOQ and lead times.
Not available on SMT models.)
Surface Mount Option
Blank = Standard through-hole pin mount version
M = SMT version (MSL rating 2)
On/Off Control Logic:
P = Positive
N = Negative
Input Voltage Range
Q12 = 9-36V
Q48 = 18-75V
*Special quantity order is required;
no sample quantities available.
Note:
Some model number combinations
may not be available. Please contact
Murata Power Solutions.
SPECIAL MODEL NUMBERS:
UEI-31204-C, Restricted AVL and surface mount
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MDC_UEI15W.C11
Page 2 of 17
UEI15 Series
FUNCTIONAL SPECIFICATIONS
INPUT CHARACTERISTICS
Under-
Start-up voltage
threshold Shut-
down
V
V
9.1
18
16.7
9.5
18
Isolated Wide Input Range 15-Watt DC/DC Converters
Model Family
Reflected
(back)
Ripple
Inrush
Current Transient
mA pk-pk
A
2
sec
Input Current
Min.
Load
mA
100
65
105
60
110
56
130
60
Output Short
Standby
Circuit
Low Line Mode
mA
A
mA
1.86
1.03
1.90
50
0.96
2.04
1.02
2.13
1.06
1
Recom-
mended
Fast-blow
Fuse
A
4
2
4
2
4
1.5
4
2
Remote On/Off Control
Internal Reverse
Input
Polarity On/Off Positive Logic
Negative Logic
"N" model
Filter
Protec- Current blank model
Type
tion
mA
suffix
suffix
C
L
None.
Install
external
fuse. See
note 15.
OFF=Gnd pin
or –0.7 to +0.7V
max. ON=open
pin or +10 to
+15V max.
UEI15-033-Q12
UEI15-033-Q48
UEI15-050-Q12
UEI15-050-Q48
UEI15-120-Q12
UEI15-120-Q48
UEI15-150-Q12
UEI15-150-Q48
8.6
15.6
8.5
15.6
8.4
15.6
8.4
16.2
30
0.05
16.7
9.5
16.7
9.5
18
16.7
18
1
C
OFF=open pin
or +10 to +
15V max.
ON=Gnd pin
or –0.7 to
+0.8V max.
OUTPUT CHARACTERISTICS
Ripple/Noise
(20 MHz
bandwidth)
8
Voltage Out-
put Range
Line/Load
Regulation
115
0.3
Continuous
Monotonic
2 x 10
6
OV
protection
method
Model Family
I
OUT
19
Max.
mA
V
OUT
Accuracy Adjustment Temperature Capacitive Loading Max.
50% Load
Range
Coefficient
Low ESR <0.02Ω Max,
% of V
NOM
% of V
NOM
% of V
OUT
/ºC
μF
1,000
17
Overvoltage protection
V
4.5
3.9
5.9
5.9
14.1
UEI15-033-Q12
UEI15-033-Q48
UEI15-050-Q12
UEI15-050-Q48
UEI15-120-Q12
UEI15-120-Q48
UEI15-150-Q12
UEI15-150-Q48
See
Ordering
Guide
(Minimum
load is 10%
of Imax)
±1
±10
±0.02
470
Magnetic
feedback
See ordering guide
15
19.5
20
ISOLATION CHARACTERISTICS
Input to
Output Min.
Vdc
2000
2250
2000
2250
2000
2250
2000
2250
Isolation
Resistance
Min.
MΩ
10
10
10
10
10
10
10
10
Isolation
Capacitance
pF
1000
1500
1500
1000
1000
1000
1500
1000
Basic
insulation
Isolation
Safety
Rating
DYNAMIC CHARACTERISTICS
Dynamic Load
Start-up Time
Peak
Response
(50-75-50% Deviation V
IN
to V
OUT
regulated Remote On/Off to V
OUT
Switching
Frequency
load step)
μSec
mV
(Max.) mSec
regulated max.) mSec
Model Family
KHz
to 1% V
OUT
➀
150
±125
350
UEI15-033-Q12
±35
350
UEI15-033-Q48
Model Family
UEI15-033-Q12
UEI15-033-Q48
UEI15-050-Q12
UEI15-050-Q48
UEI15-120-Q12
UEI15-120-Q48
UEI15-150-Q12
UEI15-150-Q48
UEI15-050-Q12
UEI15-050-Q48
UEI15-120-Q12
UEI15-120-Q48
UEI15-150-Q12
UEI15-150-Q48
100
150
100
±60
±30
±150
±200
±125
±175
50
50
350
375
340
350
340
380
MISCELLANEOUS CHARACTERISTICS
Current Limit
Short
Inception 98% of
Circuit
Vout, after warmup Protection
A
Method
6.0
7.2
4.6
4.5
2.0
1.8
1.6
1.7
Current
limiting,
hiccup
autorestart
Short
Circuit
Current
A
Short Circuit
Duration
(output shorted
to ground)
➀
Operating Temperature Range
Pre-
biased
setup
Calculated
MTBF
Hours
➃
2 x 10
6
3.49 x 10
6
See
Derating
Curves
Storage
Temperature
Range
ºC
Thermal
protection/
shutdown
ºC
Model Family
UEI15-033-Q12
UEI15-033-Q48
UEI15-050-Q12
UEI15-050-Q48
UEI15-120-Q12
UEI15-120-Q48
UEI15-150-Q12
UEI15-150-Q48
–40 to +85ºC
–55 to +125 ºC
135
115
4.1 x 10
6
2.1 x 10
6
2 x 10
6
Remove overload for recovery.
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MDC_UEI15W.C11
Page 3 of 17
Efficiency
UEI15 Series
Isolated Wide Input Range 15-Watt DC/DC Converters
ABSOLUTE MAXIMUM RATINGS
Q12 models
Input
Voltage
Q48 models
On/Off control,
referred to –V
IN
Volts Max. continuous
Volts, transient 100mS
Volts Max. continuous
Volts, transient 100mS
Volts, Min.
Volts, Max.
36 VDC
50 VDC
75 VDC
100 VDC
–0.3
15
See fuse section
V
OUT
nom. +20%
Current-limited, see specs
-55
+125
Input Reverse Polarity Protection
Output Overvoltage, Volts Max.
Output Current, sustained short circuit
Storage Temperature
Range, Min. ºC
Max. ºC
(4) Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-
332 Method 1, Case 3, ground fixed conditions, Tpcboard=+25 deg.C, full load,
natural air convection.
(5) The On/Off Control is normally controlled by a switch. But it may also be
driven with external logic or by applying appropriate external voltages which are
referenced to Input Common. The On/Off Control Input should use either an open
collector or open drain transistor.
(6) Output current limiting begins when the output voltage degrades
approximately 2% from the selected setting.
(7) The outputs are not intended to sink appreciable reverse current. This may
damage the outputs.
(8) Output noise may be further reduced by adding an external filter. See I/O Fil-
tering and Noise Reduction.
(9) All models are fully operational and meet published specifications, including
“cold start” at –40°C.
Root Models
All UEI15 Q12
Absolute Maximum Ratings
Absolute maximums 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 is neither implied nor recommended.
SPECIFICATION NOTES
Conditions
Start up at –40°C
Minimum
10
Typical
10.5
Maximum
11
Units
Vdc
(1) All models are tested and specified with external capacitors listed in the
table below. The external capacitors listed below are ONLY for establishing test
specifications. They are required for our test fixtures and equipment. Your applica-
tion may not need them. The converter is stable with no external capacitors but
Murata Power Solutions strongly recommends external caps. All caps are low-ESR
types. Where two or more capacitors are listed, these are connected in parallel. All
caps should mount close to the DC/DC using short leads.
All specifications are typical unless noted. General conditions for Specifica-
tions are +25 deg.C, V
IN
=nominal, V
OUT
=nominal, full load. Adequate airflow must
be supplied for extended testing under power.
(2) Input Ripple Current is tested and specified over a 5 Hz to 20 MHz band-
width. Input filtering is C
IN
=33 μF, 100V tantalum, C
BUS
=220 μF, 100V electro-
lytic, L
BUS
=12 μH.
(3) Note that Maximum Power Derating curves indicate an average current at
nominal input voltage. At higher temperatures and/or lower airflow, the DC/DC
converter will tolerate brief full current outputs if the total RMS current over time
does not exceed the Derating curve. All Derating curves are presented at sea level
altitude. Be aware of reduced power dissipation with increasing density altitude.
(10) Regulation specifications describe the deviation as the line input voltage
or output load current is varied from a nominal midpoint value to either extreme.
(11) The output overvoltage protection is automatic recovery after fault
removal. The overvoltage may occur either from internal failure or from an
external forcing voltage as in a shared power system.
(12) Output current limit and short circuit protection is non-latching. When the
overcurrent fault is removed, the converter will immediately recover.
(13) Do not exceed maximum power specifications when adjusting the output
trim.
(14) At zero output current, the output may contain low frequency components
which exceed the ripple specification. The output may be operated indefinitely
with no load.
(15) If reverse polarity is accidentally applied to the input, to ensure reverse in-
put protection with full output load, always connect an external input
fuse
in series
with the +V
IN
input. Use approximately twice the full load input current rating at
minimum input voltage.
(16) “Hiccup” operation repeatedly attempts to restart the converter with a
brief, full-current output. If the overcurrent condition still exists, the restart current
will be removed and then tried again. This short current pulse prevents over-
heating and damaging the converter. Once the fault is removed, the converter
immediately recovers normal operation.
(17) On model UEI15-050-Q48, if V
IN
<20V, output trim may only be adjusted
downwards from +5.0V (more negative).
(18) Typical values shown. For minimum and maximum values see table below.
Root Models
All UEI15 Q12
INPUT/OUTPUT EXTERNAL TEST CAPACITORS
Conditions
@+25°C
Minimum
8.8
Maximum
10
Units
Vdc
Model
UEI15-033-Q12
UEI15-033-Q48
UEI15-050-Q12
UEI15-050-Q48
UEI15-120-Q12
UEI15-120-Q48
UEI15-150-Q12
UEI15-150-Q48
Input Capacitor
100 μF
4.7 μF ceramic
100 μF
4.7 μF ceramic
100 μF
4.7 μF ceramic
100 μF
4.7 μF ceramic
Output Capacitor(s)
1 μF & 10 μF
1 μF & 10 μF
1 μF & 10 μF
1 μF & 10 μF
1 μF & 10 μF
1 μF & 10 μF
1 μF & 10 μF
1 μF & 10 μF
CAUTION:
This product is not internally fused. To comply with safety
agency certifications and to avoid injury to personnel or equipment, the user
must
connect an external fast-blow fuse to the input terminals. See fuse
information.
(19) All models require 10% of Imax minimum output load to meet specifi-
cations. However, they will not be damaged at zero output load.
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MDC_UEI15W.C11
Page 4 of 17
UEI15 Series
Isolated Wide Input Range 15-Watt DC/DC Converters
PERFORMANCE DATA
UEI15-033-Q12
Efficiency vs. Line Voltage and Load Current @ 25°C
90
85
80
Maximum Current Temperature Derating @sea level
(V
IN
= 12V or 24V, airflow from input to output)
5.5
5.0
4.5
Output Current (Amps)
(
75
Vin = 36 V
Vin = 24 V
Natural Convection
a
4.0
3.5
3.0
2.5
2.0
Efficiency (%)
70
65
60
55
50
0
0.5
1
1.5
2
Vin = 18 V
Vin = 9 V
2.5
3
3.5
4
40
45
50
55
60
65
70
75
80
85
Load Current (Amps)
A
Ambient temperature (°C)
UEI15-033-Q48
Efficiency vs. Line Voltage and Load Current @ 25°C
90
85
80
5.10
4.90
4.70
Natural Convection
a
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
(
)
Maximum Current Temperature Derating @sea level
(V
IN
= 24V, airflow from input to output)
Output Current (Amps)
4.50
4.30
4.10
3.90
3.70
3.50
40
45
50
55
60
75
Efficiency (%)
Vin = 75 V
70
65
60
55
50
1
2
3
Vin = 48 V
Vin = 18 V
65
70
75
80
85
A
Ambient Temperature
(°C)
4
5
Load Current (Amps)
UEI15-033-Q48
Maximum Current Temperature Derating @sea level
(V
IN
= 48V, airflow from input to output)
5.20
5.00
4.80
4.60
4.40
4.20
4.00
3.80
40
45
50
55
60
65
70
75
80
85
A
Ambient temperature (°C)
Natural Convection
a
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (
(400 LFM)
)
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MDC_UEI15W.C11
Page 5 of 17
Output Current (Amps)
(
Mobile and portable
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