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UNR SERIES
www.murata-ps.com
Single Output, Non-Isolated, 5V-to-2.5V
12 Amp, DC/DC Converters
Features
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. As voltages decrease much
below 3.3V, the task of designing your own circuit to efficiently derive low-voltage
power from higher-voltage buses (5V, 12V, 48V, etc.) becomes significantly more
challenging.
When you are designing power-hungry 2.5V partitions or boards, consider
Murata Power Solutions’ new UNR-2.5/12-D5. This non-isolated, 5V-to-2.5V DC/
DC delivers a full 12 Amps at an impressive 87% efficiency. Packaged in a 1" x 2" x
0.44" metal case, the converter exploits synchronous rectification, planar magnetics
and 100% automatic SMT assembly to bring you an incomparable 30 Watts of 2.5V
power.
The UNR-2.5/12-D5 delivers full power over the –40 to +50°C temperature
range without heat sinking or forced-air cooling. It is fully line (±0.1%) and load
(±0.5%) regulated and features low noise (40mVp-p) and quick (30µsec) transient
response. The unit offers remote on/off control, and it can withstand a sustained
output short circuit with full recovery to rated accuracy.
Designing your own 2.5V step-down buck regulator may be practical for lowpower applications. When you need 12 Amps, the task becomes significantly more
time consuming. Consider that the high efficiency, ease-of-use, and overall cost
effectiveness of Murata Power Solutions’ new 2.5V UNR Series make the quick
solution the best solution.
OBSOLETE PRODUCT
■
Low cost!
■
+4.75V to +5.5V input
■
+2.5V (±25mV), 12 Amp output
■
200kHz, synchronous-rectifier topology
■
High efficiency, 87%
■
Low output noise, 40mVp-p
■
Quick transient response, 30µsec
■
–40 to +50°C operation with no derating
■
Highly reliable, 100% SMT construction
■
Remote on/off control
■
Output short-circuit protection
■
1" x 2" metal package; EMC compliant
■
IEC950/EN60950/UL1950 pending
■
Modifications and customs for OEM’s
Last time buy: 3 March 2014
Click here for more information.
+VIN
+VOUT
INPUT
RETURN
OUTPUT
RETURN
LOGIC
GROUND
OVERCURRENT
DETECTION
ON/OFF
CONTROL
PWM
CONTROLLER
REFERENCE &
ERROR AMP
Signals applied to the On/Off Control are referenced to Logic Ground
which is internally connected to Input/Output Return. The Logic
Ground pin is not designed to carry heavy current. Do not install units
with the Return pins open or connected via high-impedance runs.
Figure 1. Simplified Schematic
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com/support
UNR30-40W.C01 Page 1 of 4
UNR SERIES
Single Output, Non-Isolated, 5V-to-2.5V
12 Amp, DC/DC Converters
Performance/Functional Specifications
Typical @ TA = +25°C under nominal line voltage and full-load conditions unless noted. ➀ ➁
Absolute Maximum Ratings
Input
Input Voltage Range
4.75-5.5 Volts (5V nominal)
Input Current ➂
0.15/6.9 Amps
Input Filter Type
Input Voltage
7 Volts
Capacitive
Output Current
withstand a sustained output short
Current limited. Devices can
circuit without damage.
Overvoltage Protection
None
Storage Temperature
–40 to +105°C
Reverse-Polarity Protection
None
Lead Temperature (soldering, 10 sec.)
+300°C
On/Off Control (Pin 2) ➃
TTL high (or open) = on, low = off
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.
Output
VOUT Accuracy (50% load)
±1% (±25mV) maximum
Temperature Coefficient
±0.02% per °C
Ripple/Noise (20MHz BW) ➄
40mVp-p typical, 80mVp-p maximum
Line/Load Regulation
±0.1% maximum/±0.5% maximum
Efficiency
87% typical, 84% minimum
Overcurrent Detection Point ➅
Auto-recovery
On/Off Control Functionality
The On/Off Control pin has an internal 5k pull-up resistor to +VIN. It can
be driven with any logic circuit capable of meeting the following drive requirements. Logic "0" = 0 to +0.8V. Logic "1" = +2.0V to +VIN. IIH (@VIN = +2.0V) =
–0.7mA. IIL (@VIN = 0V) = –1.1mA. Open collector logic or a single NPN drive
transistor can be used. The drive circuit should be rated for more than 5.5V.
Applying a voltage to pin 2 when no input power is applied to the converter can
cause permanent damage to the converter.
Dynamic Characteristics
Transient Response (50% load step)
30µsec to ±1% of final value
Switching Frequency
200kHz (±20kHz)
Environmental
Operating Temperature (Ambient):
Without Derating
With Derating
–40 to +50°C
to +100°C (Straight line to 0 Watts)
Storage Temperature
–40 to +105°C
MECHANICAL SPECIFICATIONS
2.00
(50.80)
Physical
Dimensions
2" x 1" x 0.44" (51 x 25 x 11.2mm)
Shielding
5-sided
Case Connection
Pin 5 (Input Return)
Case Material
Corrosion resistant steel with
non-conductive, epoxy-based, black
enamel finish and plastic baseplate
Pin Material
Tin over copper alloy
Weight
1.6 ounces (45.4 grams)
0.44
(11.18)
METAL CASE
Case C5B
INSULATED BASE
PINS 1-2: 0.040 ±0.002
(1.016 ±0.051)
PINS 3-6: 0.062 ±0.002
(1.575 ±0.051)
0.20 MIN
(5.08)
1.800
(45.72)
0.300
(7.62)
1
0.10
(2.54)
3
2
0.800
(20.32)
1.00
(25.40)
4
0.400
(10.16)
5
➀ These devices have no minimum load requirements and will regulate under no-load conditions.
➁ Achieving specified performance requires the installation of an external 470µF input capacitor
with an ESR of 20m and an rms ripple current rating of 6 Amps, as well as an external 22µF
output capacitor with an ESR of 200m or less.
➂ No-load/full-load conditions. When the unit is off, the input "standby" current is typically 10mA.
➃ See On/Off Control Functionality.
➄ Output noise may be reduced by installing additional external capacitors across the output
terminals. Caps should be selected for low ESR (typically 60mW) and located as close to the
unit as possible.
➅ Overcurrent detection initiates at approximately 30% above rated load, where the output
current "hiccups" at an overage current of 1A and remains there until the short is removed.
6
BOTTOM VIEW
0.10
(2.54)
DIMENSIONS ARE IN INCHES (MM)
0.200
(5.08)
I/O Connections
Pin
1
2
3
4
5
6
Function P9
Logic Ground
On/Off Control
+Output
Output Return
Input Return
+Input
Note:
The case is connected to
pin 5 (Input Return).
O R D E R I N G I N F O R M AT I O N
UNR-2.5/12-D5
Non-Isolated, 5V-to-2.5V, 30 Watt, DC/DC Converter, non-RoHS.
www.murata-ps.com/support
2
UNR30-40W.C01 Page 2 of 4
UNR SERIES
Single Output, Non-Isolated, 5V-to-2.5V
12 Amp, DC/DC Converters
Features
■
Low cost!
■
+4.75V to +5.5V input
■
+3.3V (±33mV), 12 Amp output
■
200kHz, synchronous-rectifier topology
■
High efficiency, 90%
■
Low output noise, 40mVp-p
■
Quick transient response, 30µsec
■
–40 to +50°C operation with no derating
■
Highly reliable, 100% SMT construction
■
Remote on/off control
■
Output short-circuit protection
■
1" x 2" metal package; EMC compliant
■
IEC950/EN60950/UL1950 pending
■
Modifications and customs for OEM’st
As 3.3V CPU’s, DSP’s and PLD’s proliferate and low-voltage currents increase,
the shortcomings of both traditional centralized power architectures and the recently
introduced 3.3V outputs on AC/DC converters become more apparent. The solution
is to locally derive 3.3V power from buses of higher voltage (5V, 12V, 48V, etc.).
"Point-of-use" power processing is the only way to guarantee the tight accuracy, low
noise, and quick transient response required by these new devices.
If you are designing power-hungry 3.3V partitions or boards, consider Murata
Power Solutions’ new UNR-3.3/12-D5. These non-isolated, 5V-to-3.3V DC/DC’s
deliver up to 12 Amps. Packaged in 1" x 2" x 0.44" metal cases, these converters
use synchronous rectification, planar magnetics, and 100% automatic SMT assembly to bring you the most cost-effective 3.3V power.
The 90% efficient UNR-3.3/12-D5 delivers its full 40W output power from
–40 to +50°C without heat sinking or forced-air cooling. It is fully line (±0.1% max.)
and load (±0.5% max.) regulated and features a TTL-compatible on/off control.
These devices can withstand a sustained output short circuit and automatically
recover to rated accuracy.
Designing your own 3.3V step-down buck regulator may be practical for lowpower applications. When you need 12 Amps, the task becomes significantly more
challenging and time consuming. It’s time to consider the high efficiency, ease-ofuse, and overall cost effectiveness of Murata Power Solutions' UNR Series. Safety
agency approvals and full EMI characterizations are currently in progress.
+VIN
+VOUT
INPUT
RETURN
LOGIC
GROUND
OUTPUT
RETURN
VOLTAGE
BOOST
OVERCURRENT
DETECTION
+VCC
ON/OFF
CONTROL
Signals applied to the On/Off Control are referenced to Logic Ground
which is internally connected to Input/Output Return. The Logic Ground
pin is not designed to carry heavy current. Do not install units with the
Return pins open or connected via high-impedance runs.
PWM
CONTROLLER
REFERENCE &
ERROR AMP
VOUT
TRIM
Figure 2. Simplified Schematic
www.murata-ps.com/support
UNR30-40W.C01 Page 3 of 4
UNR SERIES
Single Output, Non-Isolated, 5V-to-2.5V
12 Amp, DC/DC Converters
Performance/Functional Specifications
Typical @ TA = +25°C under nominal line voltage and full-load conditions unless noted. ➀ ➁
Input
Input Voltage Range
4.75-5.5 Volts (5V nominal)
Input Current ➂
0.15/8.8 Amps
Input Filter Type
Capacitive
Overvoltage Protection
None
Absolute Maximum Ratings
Input Voltage
7 Volts
Output Current
Current limited. Devices can
withstand a sustained output short
circuit without damage.
Reverse-Polarity Protection
None
Storage Temperature
–40 to +105°C
On/Off Control (Pin 2) ➃
TTL high (or open) = on, low = off
Lead Temperature (soldering, 10 sec.)
+300°C
Output
VOUT Accuracy (50% load)
±1% (±33mV) maximum
Temperature Coefficient
±0.02% per °C
Ripple/Noise (20MHz BW) ➄
40mVp-p typical, 80mVp-p maximum
Line/Load Regulation
±0.1% maximum/±0.5% maximum
Efficiency
90% typical, 87% minimum
Overcurrent Detection Point ➅
Auto-recovery
Dynamic Characteristics
Transient Response (50% load step)
30µsec to ±1% of final value
Switching Frequency
200kHz (±20kHz)
Environmental
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.
On/Off Control Functionality
The On/Off Control pin has an internal 5k pull-up resistor to +VIN. It can
be driven with any logic circuit capable of meeting the following drive requirements. Logic "0" = 0 to +0.8V. Logic "1" = +2.0V to +VIN. IIH (@VIN = +2.0V) =
–0.7mA. IIL (@VIN = 0V) = –1.1mA. Open collector logic or a single NPN drive
transistor can be used. The drive circuit should be rated for more than 5.5V.
Applying a voltage to pin 2 when no input power is applied to the converter can
cause permanent damage to the converter.
MECHANICAL SPECIFICATIONS
2.00
(50.80)
Operating Temperature (Ambient):
Without Derating
With Derating
–40 to +50°C
to +100°C (Straight line to 0 Watts)
Storage Temperature
–40 to +105°C
METAL CASE
Case C5B
0.44
(11.18)
INSULATED BASE
Physical
Dimensions
2" x 1" x 0.44" (51 x 25 x 11.2mm)
Shielding
5-sided
Case Connection
Pin 5 (Input Return)
Case Material
Corrosion resistant steel with
non-conductive, epoxy-based, black
enamel finish and plastic baseplate
Pin Material
Weight
PINS 1-2: 0.040 ±0.002
(1.016 ±0.051)
PINS 3-6: 0.062 ±0.002
(1.575 ±0.051)
0.20 MIN
(5.08)
1.800
(45.72)
1
0.300
(7.62)
ISO 9001 and 14001 REGISTERED
1.00
(25.40)
4
0.400
(10.16)
5
6
BOTTOM VIEW
0.10
(2.54)
DIMENSIONS ARE IN INCHES (MM)
0.200
(5.08)
I/O Connections
1.6 ounces (45.4 grams)
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
3
2
0.800
(20.32)
RoHS: Gold-plate over copper alloy
Non-RoHS: Tin over copper alloy
➀ These devices have no minimum load requirements and will regulate under no-load conditions.
➁ Achieving specified performance requires the installation of an external 470µF input capacitor
with an ESR of 20m and an rms ripple current rating of 6 Amps, as well as an external 22µF
output capacitor with an ESR of 200m or less.
➂ No-load/full-load conditions. When the unit is off, the input "standby" current is typically 10mA.
➃ See On/Off Control Functionality.
➄ Output noise may be reduced by installing additional external capacitors across the output terminals.
Caps should be selected for low ESR (typically 60m) and located as close to the unit as possible.
➅ Overcurrent detection initiates at approximately 30% above rated load, where the output current "hiccups"
at an overage current of 1A and remains there until the short is removed.
0.10
(2.54)
Pin
1
2
3
4
5
6
Function P9
Logic Ground
On/Off Control
+Output
Output Return
Input Return
+Input
Note:
The case is connected to
pin 5 (Input Return).
O R D E R I N G I N F O R M AT I O N
UNR-3.3/12-D5
UNR-3.3/12-D5-C
Non-Isolated, 5V-to-3.3V, 40 Watt, DC/DC Converter, non-RoHS version
RoHS version
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.
www.murata-ps.com/support
UNR30-40W.C01 Page 4 of 4
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