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s
ULE Series
Isolated, High Density, Eighth-Brick
1.25–20 Amp, DC/DC Converters
Typical unit
The ULE Series "Eighth-Brick" DC/DC Converters are high-current isolated
power converters designed for use in high-density system boards.
FEATURES
RoHS compliant
New 1/8-brick package, 1/4-brick pinout
in through-hole or SMT version
0.89 x 2.22 x 0.36 in. (22.6 x 56.4 x 9.1mm)
Output current: 1.25-20 Amps
Output voltages: 1.5V to 48V
Input voltage: 12V, 24V and 48V nominal
Interleaved, synchronous-rectifier
topology delivers:
Outstanding efficiency (to 94%)
Low noise
Stable no-load operation
No output reverse conduction
Excellent thermal performance
On/off control, trim and sense pins
Fully isolated (2250Vdc BASIC)
Fully I/O protected; Thermal shutdown
Certified to UL/IEC/EN 60950-1 and CAN/CSA
C22.2 No.60950-1, 2nd edition
Lead-free construction/attach
PRODUCT OVERVIEW
Measuring just 0.89 × 2.22 × 0.36 inches (22.6
× 56.4 × 9.1mm), these open-frame, low-profile
E-bricks fit the industry-standard quarter-brick
footprint. Now you can “cut-and-paste” the layout
from your last Q-brick design to save time and save
44% board space (1.86 square inches versus 3.3)
in the process.
From a 9-18V, 18-36V or 36-75V input, ULEs
deliver 1.5 to 48 Volt outputs with current up to
20 Amps. They employ an interleaved, synchro-
nous-rectifier topology that exploits 100% of their
duty cycle. They simultaneously achieve high
efficiency, low noise, tight line/load regulation, and
quick step response.
An open-frame design, high efficiency, low-on-
resistance FETs, and planar magnetics embedded
in heavy-copper pc boards all contribute to
impressive thermal derating. The ULEs feature set
includes high isolation (2250Vdc, 48V models),
input pi filters, input undervoltage shutdown,
output overvoltage protection, current limiting,
short-circuit protection, and thermal shutdown. The
standard footprint carries V
OUT
trim, on/off control,
and sense pins (sense pins are not available on
12V or higher models).
All ULE E-Bricks are certified to the BASIC-
insulation requirements of UL/EN/IEC60950-1,
2nd edition, and all “D48” models (36-75V input
ranges) carry the CE mark. Safety certifications,
EMC compliance testing and qualification testing
are available.
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com/support
MDC_ULE Series.E04
Page 1 of 26
ULE Series
Isolated, High Density, Eighth-Brick
1.25–20 Amp, DC/DC Converters
PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE
Output
V
OUT
(V)
1.5
1.5
1.8
1.8
2.5
2.5
3.3
3.3
3.3
5
5
5
12
12
24
48
Input
Regulation (Max.)
Line
±0.15%
±0.15%
±0.25%
±0.25%
±0.05%
±0.05%
±0.05%
±0.05%
±0.1%
±0.05%
±0.1%
±0.1%
±0.05%
±0.05%
±0.3%
±0.175%
Load
±0.15%
±0.15%
±0.25%
±0.25%
±0.05%
±0.1%
±0.05%
±0.05%
±0.25%
±0.05%
±0.25%
±0.25%
±0.075%
±0.075%
±1.25%
±3.2%
Efficiency
Model Family
ULE-1.5/20-D24P-C
ULE-1.5/20-D48N-C
ULE-1.8/20-D24P-C
ULE-1.8/20-D48N-C
ULE-2.5/20-D24P-C
ULE-2.5/20-D48N-C
ULE-3.3/20-D12P-C
ULE-3.3/20-D24P-C
ULE-3.3/20-D48N-C
ULE-5/10-D12P-C
ULE-5/12-D24P-C
ULE-5/12-D48N-C
ULE-12/4.2-D24P-C
ULE-12/4.2-D48N-C
ULE-24/3-D48N-C
ULE-48/1.25-D48N-C
I
OUT
(A)
20
20
20
20
20
20
20
20
20
10
12
12
4.2
4.2
3
1.25
Power
(W)
30
30
36
36
50
50
66
66
66
50
60
60
50.4
50.4
72
60
R/N (mVp-p)
Typ.
25
25
40
40
30
50
60
50
50
60
50
50
50
50
400
640
Max.
60
60
80
80
50
75
100
80
100
125
100
100
150
150
700
750
V
IN
Nom. Range
(V)
(V)
24
48
24
48
24
48
12
24
48
12
24
48
24
48
48
48
18-36
36-75
18-36
36-75
18-36
36-75
9-18
18-36
36-75
9-18
19-36
36-75
18-36
36-75
36-75
36-75
I
IN
no
load
(mA)
40
40
40
40
95
55
100
60
60
160
160
90
55
55
45
75
I
IN
full
load
(A)
1.42
0.74
1.74
0.87
2.35
1.17
6.15
3.09
1.54
4.63
2.78
1.38
2.31
1.14
1.63
1.35
Min.
86.0%
84.0%
84.5%
84.5%
87.0%
88.0%
88.9%
88.0%
87.0%
87.0%
88.0%
88.5%
89.5%
91.0%
90.8%
91.0%
Typ.
88.0%
84.5%
86.0%
86.5%
88.5%
89.0%
89.4%
89.0%
89.0%
90.0%
90.0%
90.5%
91.0%
92.0%
92.0%
92.5%
Package
(Case, Pinout)
C56, C52, P32
C56, C52, P32
C56, C52, P32
C56, C52, P32
C56, C52, P32
C56, C52, P32
C56, C52, P32
C56, C52, P32
C56, C52, P32
C56, C52, P32
C56, C52, P32
C56, C52, P32
C56, C52, P32
C56, C52, P32
C56, C52, P32
C56, P32
Please refer to the full model number structure for additional ordering part numbers and
options.
All specifications are at nominal line voltage and full load, +25ºC unless otherwise noted.
See detailed specifications.
If V
IN
= 19−20V, I
OUT
= 8A Max.
Min. load = 10%.
If V
IN
= 9−10V, I
OUT
= 18A Max.
PART NUMBER STRUCTURE
U LE
-
1.5
/
20
-
D48 N M Lx
-
C
Output Configuration:
U = Unipolar/Single Output
RoHS-6 hazardous substance compliant
Does not claim EU RoHS exemption 7b, lead in solder
Pin Length Option
(Through-hole packages only)
Eighth-Brick Package
Nominal Output Voltage
Surface (Gullwing) Mount Package
20
Maximum Rated Output
Current in Amps
Input Voltage Range:
D12 = 12V nominal
D24 = 24V nominal
D48 = 48V nominal
Note:
Some model number combinations
may not be available. Please contact
Murata Power Solutions.
Blank = standard length 0.180˝ (4.6mm)
L1 = Pin length 0.110±0.010˝ (2.79±0.25mm)*
L2 = Pin length 0.145±0.010˝ (3.68±0.25mm)*
*Special quantity order is required;
no sample quantities available.
Remote On/Off Control Polarity:
P = Positive polarity (standard for D12 and
D24 models, optional special order for D48 models)
N = Negative polarity (standard for D48 models,
optional special order for D12 and D24 models)
See notes on page 9.
www.murata-ps.com/support
MDC_ULE Series.E04
Page 2 of 26
ULE Series
Isolated, High Density, Eighth-Brick
1.25–20 Amp, DC/DC Converters
FUNCTIONAL SPECIFICATIONS
INPUT CHARACTERISTICS
Load Current
Remote On/Off Control
Under Reflected
Inter-
Start-up Voltage (back)
Full
Inrush
nal Reverse
Positive
Negative
threshold Shut- Ripple
Load Transient Output
Low Standby Input Polarity Cur-
Logic
Logic
Min.
down Current Condi- Conditions Short No Load Line Mode Filter Protec- rent
“P” model
“N” model
(V)
(V)
(mA)
tions (A
2
sec) Circuit (mA) (A) (mA) Type tion (mA)
suffix
suffix
17.0
34.0
17.0
33.0
17.0
33.0
8.5
17.0
34.5
8.5
19.0
34.5
17.0
35.0
35.0
35.0
16.0
33.0
16.0
31.0
16.0
32.0
8.0
See
16.0 15−45,
model Ordering
33.5 dependent Guide
8.0
17.5
33.5
16.0
34.0
33.0
33.5
0.5−1
1.96
0.98
2.33
1.16
3.23
1.55
7.42
40−250 40−160
1−8
model model 4.10 model
depen- depen- 2.05 depen-
dent
dent
dent
6.14
3.30
1.82
3.04
1.51
2.17
1.46
150
6-90
150
6-90
OFF=Ground pin OFF=open or 6-90, model
None,
to +0.8V max.
+3.5V to
dependent
install
+13.5V max.
1.0
ON=open or
external
3.5V to +13.5V ON=Ground pin
fuse
to +0.8V max.
max.
6-90, model
dependent
Start-up Time
V
IN
to V
OUT
Remote On/Off
regulated to V
OUT
regu-
(Max.)
lated (Max.)
mSec
mSec
Model Family
ULE-1.5/20-D24
ULE-1.5/20-D48
ULE-1.8/20-D24
ULE-1.8/20-D48
ULE-2.5/20-D24
ULE-2.5/20-D48
ULE-3.3/20-D12
ULE-3.3/20-D24
ULE-3.3/20-D48
ULE-5/10-D12
ULE-5/12-D24
ULE-5/12-D48
ULE-12/4.2-D24
ULE-12/4.2-D48
ULE-24/3-D48
ULE-48/1.25-D48
L-C
OUTPUT CHARACTERISTICS
Capacitive Loading
Max.
V
OUT
Accuracy Low ESR <0.02Ω Max.
resistive load
V
OUT
50% Load
(μF)
(V) % of V
NOM
1.5
1.5
1.8
1.8
2.5
2.5
±1 to ±2
3.3 of V
NOM
,
model
3.3
dependent
5
5
5
12
12
24
48
2000
680
470
300 mA
No Minimum
none
10%
none
3.3
10,000
−20 to +10%
±0.02% of
of V
NOM
, model
V
OUT
range/°C
dependent
No Minimum
Load
18
See Ordering Guide
+10%
Current Limit
Inception
98% of V
OUT
after warmup
(A)
24
24
24
25
24
24
24
24
26
13
15
16
6
6.25
4.25
2.5
Model Family
ULE-1.5/20-D24
ULE-1.5/20-D48
ULE-1.8/20-D24
ULE-1.8/20-D48
ULE-2.5/20-D24
ULE-2.5/20-D48
ULE-3.3/20-D12
ULE-3.3/20-D24
ULE-3.3/20-D48
ULE-5/10-D12
ULE-5/12-D24
ULE-5/12-D48
ULE-12/4.2-D24
ULE-12/4.2-D48
ULE-24/3-D48
ULE-48/1.25-D48
Adjustment
Range
Temperature
Coefficient
Minimum
Loading
Ripple/Noise
Remote Sense
(20 MHz
Line/Load
Compensation bandwidth)
Regulation
Efficiency
See notes on page 5.
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MDC_ULE Series.E04
Page 3 of 26
ULE Series
Isolated, High Density, Eighth-Brick
1.25–20 Amp, DC/DC Converters
ISOLATION CHARACTERISTICS
DYNAMIC CHARACTERISTICS
Model Family
ULE-1.5/20-D24
ULE-1.5/20-D48
ULE-1.8/20-D24
ULE-1.8/20-D48
ULE-2.5/20-D24
ULE-2.5/20-D48
ULE-3.3/20-D12
ULE-3.3/20-D24
ULE-3.3/20-D48
ULE-5/10-D12
ULE-5/12-D24
ULE-5/12-D48
ULE-12/4.2-D24
ULE-12/4.2-D48
ULE-24/3-D48
ULE-48/1.25-D48
Input to
Output
Min.
(V)
Isolation
Resistance
(MΩ)
Isolation
Capacitance
Isolation
(pF)
Safety Rating
Model Family
ULE-1.5/20-D24
ULE-1.5/20-D48
ULE-1.8/20-D24
ULE-1.8/20-D48
Dynamic Load Response
(50-75-50% load step)
100μSec to ±1.5% of final value
100μSec to ±1.5% of final value
100μSec to ±1.5% of final value
100μSec to ±1.5% of final value
150μSec to ±1% of final value
80μSec to ±1.5% of final value
150μSec to ±1.25% of final value
150μSec to ±1.5% of final value
150μSec to ±1% of final value
75μSec to ±2% of final value
75μSec to ±2% of final value
100μSec to ±1% of final value
150μSec to ±1.25% of final value
150μSec to ±1.25% of final value
200μSec to ±2% of final value
200μSec to ±1% of final value
Switching
Frequency
KHz
280±15
280±15
340±15
340±15
385±15
385±45
310±15
385±15
365±15
325±15
450±15
450±15
400±15
380±15
240±30
250±15
1750
ULE-2.5/20-D24
ULE-2.5/20-D48
2000-
2250 min.,
model
dependent
ULE-3.3/20-D12
100
470
Basic
Insulation
ULE-3.3/20-D24
ULE-3.3/20-D48
ULE-5/10-D12
ULE-5/12-D24
ULE-5/12-D48
1750
2000
1500
ULE-12/4.2-D24
ULE-12/4.2-D48
ULE-24/3-D48
ULE-48/1.25-D48
MISCELLANEOUS CHARACTERISTICS
Operating Temperature Range
Calculated
MTBF
See
derating curves
Operating PCB
Storage
Temperature Temperature
(no derating)
Range
Thermal
Protection/
Shutdown
Short
Circuit
Current
3A
3A
3A
3A
3A
3A
+105 to
+125ºC,
model
dependent
300mA
3A
3A
5A
5A
2A
3A
3A
0.65A
500mA
Overvoltage
Protection
12
via magnetic Short Circuit
feedback
Protection Short Circuit
(V)
Method
Duration
16
2.3
2.0
2.3
2.3
3.5
3.0
3.96
3.96
3.96
6.0
6.0
6.4
15.0
14.0
28.0
55.0
Current
limiting,
hiccup
autorestart.
Remove
overload for
recovery
Model Family
ULE-1.5/20-D24
ULE-1.5/20-D48
ULE-1.8/20-D24
ULE-1.8/20-D48
ULE-2.5/20-D24
ULE-2.5/20-D48
ULE-3.3/20-D12
ULE-3.3/20-D24
ULE-3.3/20-D48
ULE-5/10-D12
ULE-5/12-D24
ULE-5/12-D48
ULE-12/4.2-D24
ULE-12/4.2-D48
ULE-24/3-D48*
ULE-48/1.25-D48
Relative
Humidity
TBC
−40 to +85ºC with derating
−40 to
+105ºC
−55 to
+125ºC
Continuous,
output
shorted to
ground.
No damage.
To
+85ºC/85%
non-
condensing
*No derating is required up to 85°C.
See notes on page 5.
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MDC_ULE Series.E04
Page 4 of 26
ULE Series
Isolated, High Density, Eighth-Brick
1.25–20 Amp, DC/DC Converters
FUNCTIONAL SPECIFICATION NOTES
1. All models are tested and specified with external 1||10 μF ceramic/tantalum output
capacitors and a 22 μF external input capacitor. All capacitors are low ESR types.
These capacitors are necessary to accommodate our test equipment and may
not be required to achieve specified performance in your applications. All models
are stable and regulate within spec under no-load conditions. General conditions
for Specifications 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 bandwidth. Input
filtering is C
IN
=33 μF tantalum, C
BUS
=220 μF electrolytic, 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.
4. Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method 1,
Case 3, ground fixed conditions, Tpcboard=+25ºC, full output 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. Short circuit shutdown begins when the output voltage degrades approximately 2%
from the selected setting.
7. The outputs are not intended to sink appreciable reverse current..
8. Output noise may be further reduced by adding an external filter. See I/O Filtering
and Noise Reduction.
9. All models are fully operational and meet published specifications, including “cold
start” at –40ºC.
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. Alternate pin length and/or other output voltages are available under special quantity
order.
12. Electronic overvoltage shutdown is not included on 48V input models to comply
with certain telecom reliability requirements. These requirements attempt continued
operation despite input overvoltage. The converter is rated only to the maximum
input voltage.
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, a body diode will become
forward biased and will conduct considerable current. To ensure reverse input
protection with full output load, always connect an external input fuse in series with
the +V
IN
input. Use approximately twice the full input current rating with nominal
input voltage.
16. Output current limit is non-latching. When the overcurrent fault is removed, the
converter will immediately recover.
17. The Sense inputs are not included on lower current output models.
18. ULE-12/4.2-D24 minimum load is 0.42 Amps (10%) for rated specifications.
19. ULE-5/12-D24 I
OUT
=8A max. if V
IN
=19-20V.
20. ULE-12/4.2-D48 has no surface mount option.
21. Full load conditions, see ordering guide.
PHYSICAL CHARACTERISTICS AND SAFETY
Outline dimensions
Pin material
Pin diameter
Pin finish
Weight
Electromagnetic interference (external filter required)
Safety
Absolute Maximum Ratings
See mechanical specs (below)
Copper alloy
0.04/0.062" (1.016/1.524mm)
Nickel underplate with gold overplate
1 ounce (28 grams)
Designed to meet EN55022/CISPR22 with external filter
Certified to UL/cUL 60950-1, CSA-C22.2 No. 60950-1, IEC/EN 60950-1, 2nd edition
Input Voltage:
Continuous:
12 Volt input models
24 Volt input models
48 Volt input models
Transient (100 mSec. Max.)
12 Volt input models
24 Volt input models
48 Volt input models
On/Off Control
(pin 2)
Input Reverse Polarity Protection
Output Overvoltage Protection
Output Current *
Storage Temperature
Lead Temperature
18 Volts
36 Volts
75 Volts
25 Volts
50 Volts
100 Volts
See specifications
5 Amps, 10 sec. max.
Magnetic feedback. See note (7).
Current-limited. Devices can with stand
sustained short circuit without damage.
–55 to +125°C.
Refer to solder profile.
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.
* The outputs are not intended to sink reverse current.
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MDC_ULE Series.E04
Page 5 of 26
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