UNR D5/D12 Series
www.murata-ps.com
Single Output, Non-Isolated, 5 or 12VIN to 1.8/2.5/3.3VOUT
8 and 10 Amp DC/DC Converters
OBSOLETE PRODUCT
Features
Input ranges of 4.75-5.5V or 10.8-13.6V
Output voltages of 1.8/2.5/3.3V
8 and 10 Amp output current models
VOUT user-trimmable from 1.28V to 3.6V
Non-isolated, full synchronous topology
1" x 2" through-hole or SMT package
Gull-wing leads for SMT package
High efficiency to 91%; Low noise
200kHz switching; Planar magnetics
–40 to +40/50/60°C ambient operation with
no derating
Remote on/off control; Output overcurrent
detection
IEC950/EN60950/UL1950 approval
As supply voltages trend lower and load currents increase, centralized power
becomes more impractical. The tight accuracy, low noise and quick transient
response demanded by today's low voltage CPU's, ASIC's and DSP's make power
processing at the point of use the only viable solution. The UNR 18-33W series provides a complete line of non-isolated DC/DC converters to satisfy this requirement.
With input voltages of 5V (-D5 models) and 12V (-D12 models) these converters
offer standard output voltages of 1.8, 2.5 and 3.3 Volts and up to 10 Amps of output
current in both through-hole and surface-mount 1" x 2" metal cases.
With on/off control and output voltage trim capability as standard features, these
non-isolated converters exploit full synchronous rectification, planar magnetics, and
100% automated assembly to deliver high efficiencies (to 91%) and low noise at low
cost.
These versatile DC/DC’s are fully line and load regulated. They feature quick
transient response (50µsec), user-optional on/off control (for power sequencing),
and output overcurrent detection and shutdown ("hiccup" technique with auto-recovery). Their impressive guaranteed efficiencies enable them to deliver fully rated
output power from –40 to +50/55°C (ambient) without supplemental cooling.
If your high current requirements have made the use of inefficient linear regulators impractical, take a look at one of Murata Power Solutions’ new switching buck
regulators. Their high efficiency, ease-of-use, long-term reliability, and overall cost
effectiveness will impress you. Safety agency approvals and EMC characterizations
are currently in progress.
Last time buy: 3 March 2014
Click here for more information.
+VIN
+VOUT
INPUT
RETURN
LOGIC
GROUND
OUTPUT
RETURN
VOLTAGE
BOOST
➀
OVERCURRENT
DETECTION
+VCC
ON/OFF
CONTROL
PWM
CONTROLLER
REFERENCE &
ERROR AMP
Figure 1. Simplified Schematic
VOUT
TRIM
➀ -D5 models only.
Typical topology is shown.
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com/support
UNR18-33W.C01 Page 1 of 9
UNR D5/D12 Series
Performance Specifications and Ordering Guide
Single Output, Non-Isolated, 5 or 12VIN to 1.8/2.5/3.3VOUT
8 and 10 Amp DC/DC Converters
➀
Output
Input
Load ➂
VIN Nom.
(Volts)
Range
(Volts)
IIN ➃
(mA/mA)
Min.
Typ.
Package
(Case,
Pinout)
±0.5%
5
4.75-5.5
150/4190
82%
86%
C16A2, P23
±0.1%
±0.5%
5
4.75-5.5
150/4190
82%
86%
C18, P25
100
±0.1%
±0.5%
5
4.75-5.5
150/5620
85%
89%
C16A2, P23
75
100
±0.1%
±0.5%
5
4.75-5.5
150/5620
85%
89%
C18, P25
40
80
±0.1%
±0.5%
5
4.75-5.5
100/5470
88%
92%
C16A1, P23
5
4.75-5.5
100/5470
88%
92%
C18, P25
12
10.8-13.6
50/2420
86%
91%
C16A1, P23
R/N (mVp-p) ➁
Regulation (Max.)
Efficiency
Root Model ➄
VOUT
(Volts)
IOUT
(Amps)
Typ.
Max.
Line
UNR-1.8/10-D5T
1.8
10
70
100
±0.1%
UNR-1.8/10-D5SM
1.8
10
40
80
UNR-2.5/10-D5T
2.5
10
75
UNR-2.5/10-D5SM
2.5
10
UNR-3.3/8-D5T
3.3
8
UNR-3.3/8-D5SM
3.3
8
40
80
±0.1%
±0.5%
UNR-3.3/8-D12T
3.3
8
40
100
±0.25%
±0.875%
UNR-3.3/8-D12SM
3.3
8
40
100
±0.25%
±0.875%
12
10.8-13.6
50/2420
86%
91%
C18, P25
UNR-3.3/10-D5T
3.3
10
40
80
±0.1%
±0.5%
5
4.75-5.5
150/7250
86%
91%
C16A2, P23
UNR-3.3/10-D5SM
3.3
10
50
100
±0.1%
±0.5%
5
4.75-5.5
150/7250
86%
91%
C18, P25
UNR-3.3/10-D12T
3.3
10
70
120
±0.25%
±0.875%
12
10.8-13.6
90/3090
86%
89%
C16C2, P23
UNR-3.3/10-D12SM
3.3
10
70
120
±0.25%
±0.875%
12
10.8-13.6
90/3090
86%
89%
C18, P25
➀ Typical at TA = +25°C under nominal line voltage and full-load conditions, unless otherwise
noted. All models are tested and specified with an external 22µF output capacitor with a
200mΩ ESR and a 470µF input capacitor with 6Arms ripple-current rating and 20mΩ
ESR. See I/O Filtering and Noise Reduction for more details.
MECHANICAL SPECIFICATIONS
➁ Ripple/Noise (R/N) is tested/specified over a 20MHz bandwidth. Output noise may be further
reduced by installing additional external output caps. See I/O Filtering and Noise Reduction.
➂ These devices have no minimum-load requirements and will regulate under no-load conditions.
➃ Nominal line voltage, no-load/full-load conditions.
➄ These are only partial part numbers, refer to part number structure when ordering.
PART NUMBER STRUCTURE
U NR - 1.8 / 10 - D5 SM - C
2.00
(50.80)
METAL CASE
SEE
NOTES
Case C16A1, A2,C2
INSULATED BASE
RoHS-6 compliant*
Output Configuration:
U = Unipolar
Packaging:
T = Through-Hole Package
SM = Surface-Mount Package
Non-Isolated
Nominal Output Voltage:
1.8, 2.5 or 3.3 Volts
0.20 MIN
(5.08)
0.10
(2.54)
1.800
(45.72)
0.300
(7.62)
1
Maximum Rated Output
Current in Amps
3
4
2
5
6
0.800
(20.32)
4 EQ. SP. @
0.200 (5.08)
Input Voltage Range:
D5 = 4.75 to 5.5 Volts (5V nominal)
D12 = 10.8 to 13.6 Volts (12V nominal)
* Contact Murata Power Solutions Technologies (DATEL) for availability.
1.00
(25.40)
7
BOTTOM VIEW
DIMENSIONS IN INCHES (MM)
0.10
0.10 (2.54)
(2.54)
0.100
(2.54)
0.110
(2.79)
CASE C16A1
CASE HEIGHT: 0.39 (9.91)
PIN DIAMETERS:
PINS 1-7:
0.040 ±0.002 (1.016 ±0.051)
4
3
7
CASE C16A2
CASE HEIGHT: 0.39 (9.91)
PIN DIAMETERS:
PINS 1-2, 4:
0.040 ±0.002 (1.016 ±0.051)
PINS 3, 5-7:
0.062 ±0.002 (1.575 ±0.051)
CASE C16C2
CASE HEIGHT: 0.48 (12.19)
PIN DIAMETERS:
PINS 1-2, 4:
0.040 ±0.002 (1.016 ±0.051)
PINS 3, 5-7:
0.062 ±0.002 (1.575 ±0.051)
9
8
I/O Connections
Pin
1
2
3
4
5
6
7
8
9
Function P23
Logic Ground
On/Off Control
+Output
Trim
Output Return
Input Return
+Input
No Pin
No Pin
Function P25
Logic Ground
On/Off Control
N.C.
N.C.
+Output
Trim
Output Return
Input Return
+Input
0.500
(12.70) 0.300
(7.62)
2
Case C18
6
0.800
(20.32)
4 EQ. SP. @
0.200 (5.08)
1.00
(25.40)
5
1
TOP VIEW
0.10
(2.54)
2.00
(50.80)
0.110
(2.79)
0.060
(1.52)
0.43
(10.92)
0.015
(0.38)
INSULATED BASE
METAL CASE
0.015
(0.38)
0.055
(1.40)
DIMENSIONS ARE IN INCHES (MM)
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UNR18-33W.C01 Page 2 of 9
UNR D5/D12 Series
Performance/Functional Specifications
Typical @ TA = +25°C under nominal line voltage and full-load conditions unless noted. ➀
Single Output, Non-Isolated, 5 or 12VIN to 1.8/2.5/3.3VOUT
8 and 10 Amp DC/DC Converters
Physical
Input
Input Voltage Range
D5 Models
D12 Models
3.0 to 3.6 Volts (3.3V nominal)
4.75-5.5 Volts (5V nominal)
10.8-13.6 Volts (12V nominal)
Input Current:
Normal Operating Conditions
Standby/Off Mode
See Ordering Guide
3.6mA typical
Input Ripple Current:
1.8/2.5V Models
3.3/8 -D5 Models
3.3/10 -D5 Models
3.3/8 -D12 Models
3/3/10 -D12 Models
150mAp-p
100mAp-p
150mAp-p
110mAp-p
250mAp-p
Input Filter Type
Capacitive
Overvoltage Protection
None
Reverse-Polarity Protection
None
On/Off Control: ➂
Functionality
Logic Threshold
TTL high (or open) = on, low = off
+0.8-2.0 Volts (1.5V typical)
Shielding
5 sided
Case Connection
Input/Output Return
Case Material
Corrosion-resistant steel with
non-conductive, epoxy-based, black
enamel finish and plastic baseplate
Pin Material
RoHS: Gold plate over copper alloy
Non-RoHS: Pure tin on copper alloy with
nickel underplate
➀ All models are tested and specified with an external 470µF input capacitor with a 20mΩ
ESR and a 6Arms ripple-current rating, as well as a 22µF output capacitor with a 200mΩ ESR.
See I/O Filtering and Noise Reduction for more details. These devices have no minimum-load
requirements and will regulate under no-load conditions. Listed specifications apply for both
"T" and "SM" models as appropriate.
➁ See Output Overcurrent Detection for details.
➂ See On/Off Control for details.
➃ See Output Voltage Trimming for details.
➄ For all models, output noise can be further reduced with the installation of additional
external output capacitors. See I/O Filtering and Noise Reduction for details.
➅ See Start-Up Time for details.
➆ See Temperature Derating for details.
Output
Absolute Maximum Ratings
VOUT Accuracy (50% load):
1.8VOUT Models
2.5/3.3VOUT Models
±2% of VOUT maximum
±1% of VOUT maximum
VOUT Trim Range ➃
Trim pin tied to +Output:
Trim pin tied to Output Return
VOUT = 1.52 Volts or less
VOUT = 3.6 Volts or greater
Input Reverse-Polarity Protection
None
Temperature Coefficient
±0.02% per °C
Input/Output Overvoltage Protection
None
Ripple/Noise (20MHz BW) ➄
See Ordering Guide
Output Current
Line/Load Regulation
See Ordering Guide
Efficiency
See Ordering Guide
Current limited. Devices can
withstand a sustained output
short circuit without damage.
Storage Temperature
–40 to +105°C
Lead Temperature (Soldering, 10 sec.)
+300°C
Overcurrent Protection: ➁
Technique
Overcurrent Detection Point
Average Short Circuit Current:
D5 Models
D12 Models
"Hiccup" with auto-recovery
110-180% of rated current
1 Amp typical, 3 Amps maximum
4 Amp typical, 6 Amps maximum
Dynamic Characteristics
Transient Response (50-100% load):
1.8VOUT Models
1.8/2.5VOUT Models
3.3VOUT -D5 Models
3.3/8 -D12 Models
3.3/10 -D12 Models
100µsec to 3% of final value
25µsec to 2.5% of final value
50µsec to 2.5% of final value
50µsec to 1% of final value
50µsec to 2.5% of final value
Start-Up Time: ➅
VIN to VOUT
25/30msec (1.8/2.5VOUT models)
On/Off to VOUT 25/30msec (1.8/2.5VOUT models)
Switching Frequency
300kHz (±30kHz)
Environmental
Operating Temperature (Ambient): ➆
Without Derating
With Derating
See Derating Curves
to +100°C (See Derating Curves)
Storage Temperature
–40 to +105°C
Physical
Dimensions:
D5 Through-Hole Models
D5 Surface-Mount Models
D12 Through-Hole Models
D12 Surface-Mount Models
Flammability
2" x 1" x 0.39" (51 x 25 x 9.9mm)
2" x 1" x 0.43" (51 x 25 x 10.9mm)
2" x 1" x 0.48" (51 x 25 x 12.2mm)
2" x 1" x TBD" (51 x 25 x 12.7mm)
94V-0
Input Voltage:
Continuous:
D5 Models
D12 Models
Transient (100msec)
7 Volts
15 Volts
15 Volts
These are stress ratings. Exposure of devices to 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.
TECHNICAL NOTES
Return Current Paths
These are non-isolated DC/DC converters. The Input Return, Output Return
and Logic Ground pins are all connected together internally. To the extent
possible, all input and load currents should be returned through the Input
Return and Output Return, respectively (via low-impedance runs). Any control signals applied to the On/Off Control pin should be referenced to Logic
Ground. The internal trace leading to Logic Ground is not designed to carry
high current. Consequently, devices should never be installed in a manner
that results in high current flow through Logic Ground (i.e., the Input/Output
Return pins should never be left open or connected via high-impedance paths).
I/O Filtering and Noise Reduction
All UNR 18-33W Series converters are tested and specified with external
470µF input capacitors (20mΩ ESR, 6Arms ripple-current rating) and
external 22µF output capacitors (200mΩ ESR). External input capacitance is
required and must be rated to handle the input ripple current as follows:
IRMS = IOUT
√
VOUT
VIN
(1 – VOUT )
VIN
In critical applications, input/output ripple/noise may be further reduced by
installing additional I/O caps.
www.murata-ps.com/support
UNR18-33W.C01 Page 3 of 9
UNR D5/D12 Series
Input Fusing
Single Output, Non-Isolated, 5 or 12VIN to 1.8/2.5/3.3VOUT
8 and 10 Amp DC/DC Converters
UNR 18-33W Series DC/DC converters are not internally fused. Certain
applications and or safety agencies may require the installation of fuses
at the inputs of power conversion components. For Murata Power Solutions UNR Series DC/DC converters, you should use either slow-blow or
normal-blow fuses with values no greater than twice the expected input
current at full power. See Ordering Guide.
+INPUT
RPULL UP
D5 Models 4.99kΩ
D12 Models 12.4kΩ
ON/OFF
CONTROL
Input Overvoltage and Reverse-Polarity Protection
UNR 18-33W Series DC/DC converters do not incorporate either input overvoltage or input reverse-polarity protection. Input voltages in excess of the
listed absolute maximum ratings and input polarity reversals of longer than
"instantaneous" duration can cause permanent damage to these devices.
On/Off Control
The On/Off Control pin may be used for remote on/off operation. UNR 1833W Series DC/DC converters are designed so that they are enabled when
the control pin is pulled high or left open (normal mode) and disabled when
the control pin is pulled low (to less than +0.8V relative to Logic Ground). As
shown in Figure 2, D5 models have internal 4.99kΩ pull-up resistors to VIN
(+Input), while D12 models have 12.4kΩ.
Dynamic control of the on/off function is best accomplished with a mechanical relay or open-collector/open-drain drive circuit (optically isolated if appropriate). The drive circuit should be able to sink appropriate current when
activated and withstand appropriate voltage when deactivated.
Applying an external voltage to the On/Off Control pin when no input power is
applied to the converter can cause permanent damage to the converter. The
on/off control function, however, is designed such that the converter can be
disabled (control pin pulled low) while input voltage is ramping up and then
"released" once the input has stabilized. The time duration between the point
at which the converter is released and its fully loaded output settles to within
specified accuracy can be found in the Performance/Functional Specifications Table. See Start-Up Time for more details.
Start-Up Time
The VIN to VOUT Start-Up Time is the interval between the time at which a
ramping input voltage crosses the lower limit of the specified input voltage
range (4.75V for D5 models, 10.8V for D12 models) and the fully loaded
output voltage enters and remains within it specified accuracy band. Actual
measured times will vary with heavy capacitive loading.
The On/Off to VOUT Start-Up Time assumes the converter is turned off via the
Remote On/Off Control with the nominal input voltage already applied to the
converter. The specification defines the interval between the time at which
the converter is turned on and the fully loaded output voltage enters and
remains within its specified accuracy band. See Typical Performance Curves
for details
Output Overvoltage Protection
UNR 18-33W Series DC/DC converters do not incorporate output overvoltage protection. In the extremely rare situation in which the device’s feedback
loop is broken, the output voltage may run to excessively high levels. If it is
absolutely imperative that you protect your load against any and all possible
overvoltage situations, voltage limiting circuitry must be provided external to
the power converter.
LOGIC
GROUND
Figure 2. Driving the On/Off Control Pin
Output Overcurrent Detection
Overloading the output of a power converter for an extended period of time
will invariably cause internal component temperatures to exceed their maximum ratings and eventually lead to component failure. High-current-carrying
components such as transformers, FET's and diodes are at the highest risk.
UNR 18-33W Series DC/DC converters incorporate an output overcurrent detection and shutdown function that serves to protect both the power
converter and its load.
When the output current of a thermally stabilized converter exceeds the
maximum rating by 40% (typical) to 80% (maximum), the internal overcurrent
detection circuit shuts down the converter by discharging the soft-start circuit
of the pulse width modulator (PWM). In this off state, which is similar to that
achieved by pulling the On/Off Control low, the output voltage quickly drops
as the output capacitors discharge into the load. Since there is no longer any
output current, the overcurrent detection circuit is released, allowing the softstart circuit to recharge and the converter to turn on again. If the faulty load
condition persists, the overcurrent detection circuit will again discharge the
soft-start circuit and shut down the converter. This continuous on/off cycling
of the converter is referred to as “hiccup mode.” Once the overload condition
is removed, the converter remains on, and the output voltage is quickly
restored to its regulated value.
The components used to sense the output current have large temperature
coefficients. Consequently, in a "cold-start" situation, the Overcurrent Detection Point may temporarily move to 80% to 120% above the rated current
specification. The device quickly heats up, particularly if an overload situation
exists, and restores the normal (40%) Overcurrent Detection Point. The
device will not be damaged by starting up into an output-short-circuit condition.
The overcurrent detection circuitry helps keep internal current levels and
operating temperatures within safe operating limits. Nevertheless, sustained
operation at current levels above the rated output current but below the Overcurrent Detection Point may result in permanent damage to the converter.
Output Voltage Trimming
UNR 18-33W devices can be trimmed to any voltage between 1.50V and
3.55V. Trimming is accomplished with either a trimpot or a single fixed resistor. The trimpot should be connected between +Output and Output Return
with its wiper connected to the Trim pin as shown in Figure 3 below.
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UNR18-33W.C01 Page 4 of 9
UNR D5/D12 Series
Single Output, Non-Isolated, 5 or 12VIN to 1.8/2.5/3.3VOUT
8 and 10 Amp DC/DC Converters
+OUTPUT
RTDOWN (kΩ) =
+INPUT
TRIM
INPUT
RETURN
20kΩ
5-10
Turns
LOAD
UNR-1.8/10-D5T
UNR-1.8/10-D5SM
OUTPUT
RETURN
Figure 3. Trim Connections Using a Trimpot
UNR-2.5/10-D5T
UNR-2.5/10-D5SM
A trimpot can be used to determine the value of a single fixed resistor which
should be connected, as shown in Figure 4, between the Trim pin and
+Output to trim down the output voltage, or between the Trim pin and Output
Return to trim up the output voltage. Fixed resistors should be metal-film
types with absolute TCR’s less than 100ppm/°C to ensure stability.
UNR-3.3/8-D5T
UNR-3.3/8-D5SM
UNR-3.3/10-D5T
UNR-3.3/10-D5SM
RTUP (kΩ) =
RTDOWN (kΩ) =
RTUP (kΩ) =
The equations below can be used as starting points for selecting specific
trim-resistor values. Recall that untrimmed devices are guaranteed to be
between ±1% and ±2% accurate, depending on model. See Performance
and Functional Specifications.
UNR-3.3/8-D12T
UNR-3.3/8-D12SM
UNR-3.3/10-D12T
UNR-3.3/10-D12SM
RTDOWN (kΩ) =
RT UP (kΩ) =
RTDOWN (kΩ) =
RTUP (kΩ) =
2.49(VO – 1.26)
1.8 – VO
3.14
VO – 1.8
–1.74
7.5(VO – 1.26)
2.5 – VO
9.47
VO – 2.5
–1.0
–1.0
7.5(VO – 1.26)
3.3 – VO
9.41
VO – 3.3
–1.74
–1.74
7.5(VO – 1.27)
3.3 – VO
9.5
VO – 3.3
–1.74
–1.0
–1.0
+OUTPUT
Trim
Down
+INPUT
LOAD
TRIM
INPUT
RETURN
Note: Resistor values are in kΩ. Accuracy of adjustment is subject to
tolerances of resistors and factory-adjusted output accuracy.
VO = desired output voltage.
Trim Up
OUTPUT
RETURN
Note: Install either a fixed trim-up resistor or a fixed trim-down resistor
depending upon desired output voltage.
Figure 4. Trim Connections Using Fixed Resistors
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UNR18-33W.C01 Page 5 of 9
UNR D5/D12 Series
Single Output, Non-Isolated, 5 or 12VIN to 1.8/2.5/3.3VOUT
8 and 10 Amp DC/DC Converters
Recommended PC Board Layout
SMT Solder Process for SM models
If necessary, a single pc board layout can accommodate both through-hole
and SMT models of the UNR 18-33W Series. Note that on page 2 of this
data sheet, the through-hole package is drawn with a bottom view of its pin
locations, and the surface-mount package is drawn with of top view of its
pin locations. As shown below, the through-hole pin locations, when viewed
from above, fall just inside (on 1.8 inch centers) the SMT pin locations (which
essentially begin on 2.1 inch centers). The table below shows how the pin
functions align.
For the surface-mount "SM" models of the UNR Series, the packages’ gullwing leads are made of tin-plated (150 microinches) copper. The gull-wing
configuration, as opposed to “J” leads, was selected to keep the solder joints
out from under the package to minimize both, heat conduction away from the
leads (into the encapsulated package) and shadowing effects.
1.800
(45.72)
0.10
(2.54)
Pre-heat phase 30-60°C rise/minute to 150°C maximum.
7
Lead temperature 300°C for 10 seconds maximum.
6
Case C16A2
0.800
(20.32)
4 EQ. SP. @
0.200 (5.08)
5
2
0.300
(7.62)
"SM" modules do not currently withstand the standard solder-reflow process
with its most common temperature profiles. In order to avoid damage to the
converter a selective solder process (i.e. hot air gun or a hand soldering
method) with the following parameters must therefore be chosen :
4
1.00
(25.40)
As shown in Figure 6, our tests have determined the optimal landing-pad size
to be 160 mils by 130 mils (4 x 3.3 mm).
3
1
TOP VIEW
PINS 1-2, 4: 0.040 ±0.002 (1.016 ±0.051)
PINS 3, 5-7: 0.062 ±0.002 (1.575 ±0.051)
0.10
(2.54)
+INPUT
POWER
GROUND
ON/OFF CONTROL
TRIM
+OUTPUT
0.100
(2.54)
0.110
(2.79)
4
9
8
3
0.500
(12.70)
2
Case C18
0.300
(7.62)
7
6
0.800
(20.32)
4 EQ. SP. @
0.200 (5.08)
1.00
(25.40)
0.015
(0.38)
5
1
TOP VIEW
0.10
(2.54)
SMT
Pin Number
4
3
2
1
9
8
7
6
5
Through-Hole
Pin Number
No Pin
No Pin
2
1
7
6
5
4
3
Pin Function
N.C.
N.C.
On/Off Control
Logic Ground
+Input
Input Return
Output Return
Trim
+Output
0.130*
(3.30)
0.110**
(2.79)
0.100**
(2.54)
* PAD DIMENSION
** LEAD DIMENSION
0.160*
(4.06)
Figure 6 . PC Board Land Pattern
Figure 5. Recommended Board Layout
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UNR18-33W.C01 Page 6 of 9
UNR D5/D12 Series
Single Output, Non-Isolated, 5 or 12VIN to 1.8/2.5/3.3VOUT
8 and 10 Amp DC/DC Converters
TEMPERATURE DERATING
UNR-1.8/10-D5T/D5SM Output Power vs. Ambient Temperature
UNR-3.3/8-D12T/D12SM Output Power vs. Ambient Temperature, No Air Flow
20
30
18
25
14
Output Power (Watts)
Output Power (Watts)
16
12
10
8
20
15
10
6
4
5
2
0
0
–40
0
40
45
50
55
60
65
70
75
80
85
90
95
100
–40
0
40
45
50
Ambient Temperature (˚C)
55
60
65
70
75
80
85
90
95
100
Ambient Temperature (˚C)
UNR-3.3/10-D5T/D5SM Output Power vs. Ambient Temperature, No Air Flow
UNR-2.5/10-D5T/D5SM Output Power vs. Ambient Temperature, No Air Flow
35
27.5
25
30
20
Output Power (Watts)
Output Power (Watts)
22.5
17.5
15
12.5
10
25
20
15
10
7.5
5
5
2.5
0
0
–40
0
40
45
50
55
60
65
70
75
80
85
90
95
–40
100
0
40
45
50
55
60
65
70
75
80
85
90
95
100
Ambient Temperature (˚C)
Ambient Temperature (˚C)
UNR-3.3/10-D12T/D12SM Output Power vs. Ambient Temperature, No Air Flow
UNR-3.3/8-D5T/D5SM Output Power vs. Ambient Temperature, No Air Flow
35
30
27.5
30
25
Output Power (Watts)
Output Power (Watts)
22.5
20
17.5
15
12.5
25
20
15
10
10
7.5
5
5
2.5
0
0
–40
0
40
45
50
55
60
65
70
75
Ambient Temperature (˚C)
80
85
90
95
100
–40
0
40
45
50
55
60
65
70
75
80
85
90
95
100
Ambient Temperature (˚C)
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UNR18-33W.C01 Page 7 of 9
UNR D5/D12 Series
Single Output, Non-Isolated, 5 or 12VIN to 1.8/2.5/3.3VOUT
8 and 10 Amp DC/DC Converters
EFFICIENCY VS. LINE/LOAD
UNR-3.3/8-D5T/D5SM Efficiency vs. Line/Load
94
90
92
86
90
Efficiency (%)
Efficiency (%)
UNR-1.8/10-D5T/D5SM Efficiency vs. Line/Load
94
82
78
VIN = 4.75V
74
88
86
VIN = 4.75V
84
VIN = 5.5V
70
VIN = 5V
82
VIN = 5V
66
VIN = 5.5V
80
62
78
1
2
3
4
5
6
7
8
9
10
1
2
3
Load Current (Amps)
90
92
86
90
82
78
VIN = 4.75V
6
7
8
7
8
88
86
VIN = 10.4V
84
VIN = 5V
70
5
UNR-3.3/8-D12T/D12SM Efficiency vs. Line/Load
94
Efficiency (%)
Efficiency (%)
UNR-2.5/10-D5T/D5SM Efficiency vs. Line/Load
94
74
4
Load Current (Amps)
VIN = 12V
82
VIN = 5.5V
66
VIN = 13.6V
80
62
78
1
2
3
4
5
6
7
8
9
10
Load Current (Amps)
1
2
3
4
5
6
Load Current (Amps)
UNR-3.3/10-D5T/D5SM Efficiency vs. Line/Load
94
92
Efficiency (%)
90
88
86
VIN = 4.75V
84
VIN = 5V
82
VIN = 5.5V
80
78
1
2
3
4
5
6
7
8
9
10
Load Current (Amps)
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UNR18-33W.C01 Page 8 of 9
UNR D5/D12 Series
Single Output, Non-Isolated, 5 or 12VIN to 1.8/2.5/3.3VOUT
8 and 10 Amp DC/DC Converters
TYPICAL PERFORMANCE CURVES
VIN to VOUT Start-Up Time
D5 Models, Start-up from VIN
D12 Models, Start-up from VIN
(Full load, using specified output capacitor.)
(Full load, using specified output capacitor.)
VIN
2V/div
VIN
5V/div
VOUT
1V/div
VOUT
1V/div
10msec/div
10msec/div
On/Off Control to VOUT Start-Up Time
D5 Models, Start-up from Enable
D12 Models, Start-up from Enable
(Full load, using specified output capacitor.)
(Full load, using specified output capacitor.)
ENABLE
2V/div
ENABLE
5V/div
VOUT
1V/div
VOUT
1V/div
10msec/div
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
10msec/div
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.
© 2013 Murata Power Solutions, Inc.
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UNR18-33W.C01 Page 9 of 9