ULQ Models
www.murata-ps.com
Single Output, Low-Profile, Quarter-Brick
8-25 Amp Isolated DC-DC Converters
Typical units
Features
■
Standard quarter-brick package/pinout
in through-hole or SMT version
■
Low cost; Low profile, 0.35" (8.9mm)
■
24V and 48V nominal inputs
■
Output current: 8 to 25 Amps
■
Output voltages: 1.2/1.5/1.8/2/2.5/3.3/5/12V
■
Interleaved synchronous-rectifier topology
· Ultra high efficiency
· No output reverse conduction
■
Outstanding thermal performance
■
On/off control, trim & sense functions
■
Fully isolated, 2250Vdc (BASIC)
■
Output overvoltage protection
■
Fully I/O protected; Thermal shutdown
■
UL/EN/IEC60950 safety approvals
■
Qual/HALT/EMI tested
For applications requiring improved electrical and thermal perfomance at reduced cost DATEL's
new ULQ Series "Quarter-Brick" DC-DC Converters suit perfectly. They measure just 1.45 x 2.30 x
0.35 inches (36.8 x 58.4 x 8.9mm) and fit the industry-standard footprint. You can also "pick-andplace" the ULQ-SMT version optimizing your automated SMT process.
From an 18-36V or 36-75V input, ULQ's deliver outputs of 1.2, 1.5, 1.8, or 2V fully rated at 15 or
25A, 2.5 or 3.3V at 15 or 20A, 5V at 15A and 12V at 8-10A. They
employ an interleaved, synchronous-rectifier topology that exploits 100% of their duty cycle. They
simultaneously achieve ultra-high efficiency (to 91%), tight line/load regulation (±0.125/0.25%), low
noise (25-70mVp-p), and quick step response (200µsec).
A state of the art, single-board, open-frame design with reduced component count, high
efficiency, low-on-resistance FET's, and planar magnetics embedded in heavy-copper pc boards all
contribute to impressive thermal derating.
The ULQ's feature set includes high isolation (2250Vdc), input pi filters, input undervoltage shutdown, output overvoltage protection, current limiting, short-circuit protection and thermal shutdown.
The standard footprint carries on/off control (positive or negative logic), output trim (+10/–20%) and
output sense functions.
All ULQ quarter-bricks are designed to meet the BASIC-insulation requirements of UL/EN/
IEC60950 and they will carry the CE mark. Safety certifications, EMC compliance testing and qualification testing (including HALT) are currently in progress. Contact DATEL for latest updates.
+SENSE
(7)
+VOUT
(8)
+VIN
(1)
SWITCH
CONTROL
–VOUT
(4)
–VIN
(3)
–SENSE
(5)
PWM
CONTROLLER
REMOTE
ON/OFF
CONTROL*
(2)
INPUT UNDERVOLTAGE, INPUT
OVERVOLTAGE, AND OUTPUT
OVERVOLTAGE COMPARATORS
OPTO
ISOLATION
REFERENCE &
ERROR AMP
VOUT
TRIM
(6)
* Can be ordered with positive (standard) or negative (optional) polarity.
Figure 1. Simplified Schematic
Typical topology is shown.
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com/support
Typical
topology is shown
MDC_ULQ-15A.E05 Page 1 of 17
ULQ Models
Single Output, Low-Profile, Quarter-Brick
8-25 Amp Isolated DC-DC Converters
Performance Specifications and Ordering Guide ➀
ORDERING GUIDE
Output
Vout
Iout ➁ R/N (mVp-p) ➁
(Volts) (Amps) Typ.
Max.
Root Model ➄
ULQ-1.5/15-D48N-C
ULQ-1.5/25-D24P-C
ULQ-1.5/25-D48N-C
ULQ-1.8/15-D48N-C
ULQ-1.8/25-D24P-C
ULQ-1.8/25-D48N-C
ULQ-2/15-D48N-C
ULQ-2/25-D24P-C
ULQ-2/25-D48N-C
ULQ-2.5/15-D48N-C
ULQ-3.3/15-D48NM-C
ULQ-3.3/20-D24PM-C
ULQ-3.3/20-D48NM-C
ULQ-5/15-D24PM-C
ULQ-5/15-D48NM-C
ULQ-12/8-D24PM-C
ULQ-12/10-D48NM-C
ULQ-3.3/15-D48N-C
ULQ-3.3/20-D24P-C
ULQ-3.3/20-D48N-C
ULQ-5/15-D24P-C
ULQ-5/15-D48N-C
ULQ-12/8-D24P-C
ULQ-12/10-D48N-C
1.5
1.5
1.5
1.8
1.8
1.8
2
2
2
2.5
3.3
3.3
3.3
5
5
12
12
3.3
3.3
3.3
5
5
12
12
15
25
25
15
25
25
15
25
25
15
15
20
20
15
15
8
10
15
20
20
15
15
8
10
25
50
45
25
50
70
25
50
70
35
45
50
45
50
50
95
90
45
50
45
50
50
95
90
50
100
75
50
100
100
50
100
100
55
75
100
75
100
100
130
130
75
100
75
100
100
130
130
➀ Typical at TA = +25°C under nominal line voltage and full-load conditions. All models are
specified with an external 1µF multi-layer ceramic and 10µF capacitors across their output pins.
➁ Ripple/Noise (R/N) measured over a 20MHz bandwidth.
➂ Devices have no minimum-load requirements and will regulate under no-load conditions.
Regulation specifications describe the output voltage deviation as the line voltage or load is
varied from its nominal/midpoint value to either extreme. (Load step = 50%.)
ULQ-12/8-D24N-C
ULQ-12/8-D24NL1-C
ULQ-12/8-D24NL2-C
ULQ-12/8-D24P-C
ULQ-12/10-D48NL1-C
ULQ-12/8-D24PL1-C
ULQ-3.3/15-D48N-C
ULQ-3.3/15-D48P-C
ULQ-3.3/15-D48PL1-C
ULQ-12/10-D48NL2-C
Input
Regulation (Max.) Vin Nom. Range
IIN ➃
Line
Load ➂ (Volts) (Volts) (mA/A)
±0.125%
±0.125%
±0.125%
±0.125%
±0.125%
±0.25%
±0.125%
±0.125%
±0.25%
±0.125%
±0.125%
±0.125%
±0.125%
±0.25%
±0.1%
±0.25%
±0.25%
±0.125%
±0.125%
±0.125%
±0.25%
±0.1%
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.4%
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.4%
±0.25%
±0.25%
48
24
48
48
24
48
48
24
48
48
48
24
48
24
48
24
48
48
24
48
24
48
24
48
36-75
18-36
36-75
36-75
18-36
36-75
36-75
18-36
36-75
36-75
36-75
18-36
36-75
18-36
36-75
18-36
36-75
36-75
18-36
36-75
18-36
36-75
18-36
36-75
35/0.5
50/1.8
30/0.9
35/0.6
90/2.2
45/1.1
45/0.6
50/2.4
50/1.2
45/0.9
45/1.2
80/3.1
45/1.6
50/3.5
50/1.7
90/4.4
80/2.9
45/1.2
80/3.1
45/1.6
50/3.5
50/1.7
90/4.4
80/2.9
Min.
Typ.
Package
(Case,
Pinout)
87%
85.5%
85%
87.5%
85.5%
85.5%
87%
86%
86%
88%
88.5%
87.5%
88%
89%
89%
89%
88%
88.5%
87.5%
88%
89%
89%
89%
88%
89%
87.5%
87%
89%
87.5%
87.5%
89%
88%
88%
89.5%
90.5%
89.5%
90%
91%
91%
90.5%
90%
90.5%
89.5%
90%
91%
91%
90.5%
90%
C37, P32
C37, P32
C37, P32
C37, P32
C37, P32
C37, P32
C37, P32
C37, P32
C37, P32
C37/C40, P32
C37/C40, P32
C37/C40, P32
C37/C40, P32
C37/C40, P32
C37/C40, P32
C37/C40, P32
C37/C40, P32
C37/C40, P32
C37/C40, P32
C37/C40, P32
C37/C40, P32
C37/C40, P32
C37/C40, P32
C37/C40, P32
Efficiency
➃ Nominal line voltage, no load/full load condition.
➄ Please refer to the Part Number Structure when ordering.
➅ Not all model number combinations are available. Consult Murata Power Solutions.
ULQ-3.3/20-D24N-C
ULQ-3.3/20-D24NL2-C
ULQ-3.3/20-D24P-C
ULQ-3.3/20-D24PL1-C
ULQ-12/10-D48PL2-C
ULQ-3.3/20-D24PL2-C
ULQ-5/15-D48N-C
ULQ-5/15-D48P-C
ULQ-5/15-D48PL2-C
PART NUMBER STR UCTURE
U LQ - 3.3 / 20 - D48 N M Lx - C
Output
Configuration
RoHS-6 compliant
Pin Length Option
Quarter-Brick Package
Nominal Output Voltage
Maximum Rated Output
Surface-Mount Package
(see list above)
Remote On/Off Control Logic
Input Voltage Range
See page 16 for complete Part Number Structure.
www.murata-ps.com/support
MDC_ULQ-15A.E05 Page 2 of 17
ULQ Models
Single Output, Low-Profile, Quarter-Brick
8-25 Amp Isolated DC-DC Converters
Performance/Functional Specifications
Typical @ TA = +25°C under nominal line voltage, full-load conditions, unless noted. (1)
Input
Input Voltage Range: (2)
D24 Models
D48 Models
18-36 Volts (24V nominal)
36-75 Volts (48V nominal)
Overvoltage Shutdown
D24 Models
D48 Models
37-41 Volts (39V typical)
None (3)
Start-Up Threshold: (4)
D24 Models
D48 Models
16-18 Volts (17.5V typical)
34-36 Volts (35V typical)
Undervoltage Shutdown: (4)
D24 Models
D48 Models
15.5-17.5 Volts (16.75V typical)
32.5-34.5 Volts (33.5V typical)
Input Current:
Normal Operating Conditions
Inrush Transient
Short Circuit
Standby Mode:
Off, UV, Thermal Shutdown
–40 to +85°C with derating
+100°C
+105 to 120°C, +115°C typical
Physical
Dimensions
See Mechanical Dimensions
Pin Material (through-hole)
Gold-plated copper alloy with nickel
underplate
Pad Material (SMT)
Copper alloy, pure tin over nickel underplate
Weight:
1 ounce (28 grams)
EMI Conducted and Radiated
FCC Part 15, EN55022 may require
external filter
Safety
UL/IEC/EN60950-1 CSA-C22.2 No. 234
4-10mA
Internal Input Filter Type
Pi
1 minute duration, 5A maximum
Remote On/Off Control (Pin 2): (6)
Positive Logic ("P" Suffix Models)
On = open, open collector or
3.5-13V applied
Off = pulled low to 0-0.8V IIN = 6mA max.
Negative Logic ("N" Suffix Models)
On = pulled low to 0-0.8V IIN = 6mA max.
Off = open, open collector or
3.5-13V applied
Output
Minimum Loading
No load
VOUT Accuracy (Full Load):
Initial
Temperature Coefficient
Extreme (8)
±1.25% maximum
±0.02% per °C
±3%
VOUT Trim Range (9)
+10%, –20%
Remote Sense Compensation (4)
+10%
Ripple/Noise (20MHz BW)
See Ordering Guide
Line/Load Regulation
See Ordering Guide
Efficiency
See Ordering Guide
Isolation Voltage: Input-to-Output
2000Vdc minimum, D24 models
2250Vdc minimum, D48 models
Isolation Resistance
100MΩ
Isolation Capacitance
470pF
Current Limit Inception (98% VOUT) (10)
After warmup
+125% of maximum rated current
Short Circuit: (4)
Current
Duration
Hiccup with auto-restart
Continuous
Overvoltage Protection: (4)
OVP method
PCB Temperature: (4) (7)
Maximum Allowable
Thermal Shutdown
(4) (14)
Primary-to-Secondary Insulation Level Basic
8-50mAp-p
Reverse-Polarity Protection
Environmental
TBD million hours
(13)
Operating Temperature (Ambient):
See derating curves
See Ordering Guide
0.05A2 sec maximum
50-100mA
Input Reflected Ripple Current (5)
(3)
Calculated MTBF:
VOUT nominal +20%
Comparator magnetic feedback
Dynamic Characteristics
Dynamic Load Response (11)
(50% Load Step)
60-300µsec, model dependent
Start-Up Time: (4) (12)
VIN to VOUT; On/Off to VOUT
30msec typical, 50msec maximum
Switching Frequency
160-300kHz, model dependent
Maximum Capacitive Load
4700 to 10,000µF, model dependent
All models are tested and specified with external output capacitors (1µF ceramic in parallel
with 10µF tantalum), unless otherwise noted. These converters have no minimum-load require-
ments and will effectively regulate under no-load conditions.
(2) Contact Murata Power Solutions for input voltage ranges other than those listed.
(3) See Absolute Maximum Ratings for allowable input voltages.
(4) See Technical Notes/Performance Curves for additional explanations and details.
(5) Input Ripple Current is tested/specified over a 5-20MHz bandwidth with an external 33µF input
capacitor and a simulated source impedance of 220µF and 12µH. See I/O Filtering, Input
Ripple Current and Output Noise for details.
(6) The On/Off Control is designed to be driven with open-collector (or equivalent) logic or the
application of appropriate voltages (referenced to –Input (pin 1)). See Remote On/Off Control
for more details.
(7) All models are fully operational and meet published specifications, including "cold start," at –40°C.
(8) Extreme Accuracy refers to the accuracy of either trimmed or untrimmed output voltages over
all normal operating ranges and combinations of input voltage, output load and temperature.
(9) See Output Trimming for detailed trim equations.
(10) The Current-Limit Inception point is the output current level at which the ULQ’s power-limiting
circuitry drops the output voltage 2% from its initial value. See Output Current Limiting and
Short-Circuit Protection for more details.
(11) See Performance Curves for additional information.
(12) For the Start-Up Time specifications, output settling is defined by the output voltage having
reached ±1% of its final value.
(13) MTBF’s are calculated using Telcordia (Bellcore) Method 1 Case 3, ground fixed conditions,
+40°C case temperature, and full-load conditions.
(1)
Absolute Maximum Ratings
Input Voltage:
Continuous:
Transient (100msec):
D24V Models
See OVP
NA
D48V Models
81 Volts
100 Volts
Input Reverse-Polarity Protection
Input Current must be