www.murata-ps.com
UNR SERIES
Single Output, Non-Isolated, 5V-to-2.5V
12 Amp, DC/DC Converters
Features
■
■
■
■
■
■
■
■
■
■
■
■
■
■
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
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 low-
power 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.
+V
IN
+V
OUT
INPUT
RETURN
OUTPUT
RETURN
LOGIC
GROUND
OVERCURRENT
DETECTION
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
Figure 1. Simplified Schematic
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com/support
UNR30-40W.B03
Page 1 of 4
UNR SERIES
Performance/Functional Specifications
Typical @ T
A
= +25°C under nominal line voltage and full-load conditions unless noted.
➀ ➁
Single Output, Non-Isolated, 5V-to-2.5V
12 Amp, DC/DC Converters
Absolute Maximum Ratings
Input Voltage
Output Current
withstand a sustained output short
Storage Temperature
Lead Temperature
(soldering, 10 sec.)
7 Volts
Current limited. Devices can
circuit without damage.
–40 to +105°C
+300°C
Input
Input Voltage Range
Input Current
➂
Input Filter Type
Overvoltage Protection
Reverse-Polarity Protection
On/Off Control
(Pin 2)
➃
V
OUT
Accuracy
(50% load)
Temperature Coefficient
Ripple/Noise
(20MHz BW)
➄
Line/Load Regulation
Efficiency
Overcurrent Detection Point
➅
Transient Response
(50% load step)
Switching Frequency
Operating Temperature
(Ambient):
Without Derating
With Derating
Storage Temperature
Dimensions
Shielding
Case Connection
Case Material
4.75-5.5 Volts (5V nominal)
0.15/6.9 Amps
Capacitive
None
None
TTL high (or open) = on, low = off
Output
±1% (±25mV) maximum
±0.02% per °C
40mVp-p typical, 80mVp-p maximum
±0.1% maximum/±0.5% maximum
87% typical, 84% minimum
Auto-recovery
30µsec to ±1% of final value
200kHz (±20kHz)
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 +V
IN
. It can
be driven with any logic circuit capable of meeting the following drive require-
ments. Logic "0" = 0 to +0.8V. Logic "1" = +2.0V to +V
IN
. I
IH
(@V
IN
= +2.0V) =
–0.7mA. I
IL
(@V
IN
= 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)
METAL CASE
INSULATED BASE
Dynamic Characteristics
Environmental
–40 to +50°C
to +100°C (Straight line to 0 Watts)
–40 to +105°C
Physical
2" x 1" x 0.44" (51 x 25 x 11.2mm)
5-sided
Pin 5 (Input Return)
Corrosion resistant steel with
non-conductive, epoxy-based, black
enamel finish and plastic baseplate
Tin over copper alloy
1.6 ounces (45.4 grams)
0.44
(11.18)
Case C5B
0.20 MIN
(5.08)
PINS 1-2: 0.040 ±0.002
(1.016 ±0.051)
PINS 3-6: 0.062 ±0.002
(1.575 ±0.051)
1.800
(45.72)
1
2
4
5
6
BOTTOM VIEW
0.200
(5.08)
0.400
(10.16)
3
0.10
(2.54)
Pin Material
Weight
0.300
(7.62)
0.800
(20.32)
1.00
(25.40)
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.
0.10
(2.54)
DIMENSIONS ARE IN INCHES (MM)
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.B03
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 assem-
bly 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 low-
power applications. When you need 12 Amps, the task becomes significantly more
challenging and time consuming. It’s time to consider the high efficiency, ease-of-
use, and overall cost effectiveness of Murata Power Solutions' UNR Series. Safety
agency approvals and full EMI characterizations are currently in progress.
+V
IN
+V
OUT
INPUT
RETURN
OUTPUT
RETURN
LOGIC
GROUND
VOLTAGE
BOOST
+V
CC
OVERCURRENT
DETECTION
ON/OFF
CONTROL
PWM
CONTROLLER
REFERENCE &
ERROR AMP
V
OUT
TRIM
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 2. Simplified Schematic
www.murata-ps.com/support
UNR30-40W.B03
Page 3 of 4
UNR SERIES
Single Output, Non-Isolated, 5V-to-2.5V
12 Amp, DC/DC Converters
Performance/Functional Specifications
Typical @ T
A
= +25°C under nominal line voltage and full-load conditions unless noted.
➀ ➁
Input
Input Voltage Range
Input Current
➂
Input Filter Type
Overvoltage Protection
Reverse-Polarity Protection
On/Off Control
(Pin 2)
➃
V
OUT
Accuracy
(50% load)
Temperature Coefficient
Ripple/Noise
(20MHz BW)
➄
Line/Load Regulation
Efficiency
Overcurrent Detection Point
➅
Transient Response
(50% load step)
Switching Frequency
Operating Temperature
(Ambient):
Without Derating
With Derating
Storage Temperature
Dimensions
Shielding
Case Connection
Case Material
4.75-5.5 Volts (5V nominal)
0.15/8.8 Amps
Capacitive
None
None
TTL high (or open) = on, low = off
Storage Temperature
Input Voltage
Output Current
Absolute Maximum Ratings
7 Volts
Current limited. Devices can
withstand a sustained output short
circuit without damage.
–40 to +105°C
+300°C
Lead Temperature
(soldering, 10 sec.)
Output
±1% (±33mV) maximum
±0.02% per °C
40mVp-p typical, 80mVp-p maximum
±0.1% maximum/±0.5% maximum
90% typical, 87% minimum
Auto-recovery
30µsec to ±1% of final value
200kHz (±20kHz)
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 +V
IN
. It can
be driven with any logic circuit capable of meeting the following drive require-
ments. Logic "0" = 0 to +0.8V. Logic "1" = +2.0V to +V
IN
. I
IH
(@V
IN
= +2.0V) =
–0.7mA. I
IL
(@V
IN
= 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)
Dynamic Characteristics
Environmental
–40 to +50°C
to +100°C (Straight line to 0 Watts)
–40 to +105°C
0.44
(11.18)
Case C5B
METAL CASE
INSULATED BASE
Physical
2" x 1" x 0.44" (51 x 25 x 11.2mm)
5-sided
Pin 5 (Input Return)
Corrosion resistant steel with
non-conductive, epoxy-based, black
enamel finish and plastic baseplate
RoHS: Gold-plate over copper alloy
Non-RoHS: Tin over copper alloy
1.6 ounces (45.4 grams)
0.20 MIN
(5.08)
PINS 1-2: 0.040 ±0.002
(1.016 ±0.051)
PINS 3-6: 0.062 ±0.002
(1.575 ±0.051)
1.800
(45.72)
1
2
4
5
6
BOTTOM VIEW
0.200
(5.08)
0.400
(10.16)
3
0.10
(2.54)
0.300
(7.62)
0.800
(20.32)
1.00
(25.40)
Pin Material
Weight
0.10
(2.54)
DIMENSIONS ARE IN INCHES (MM)
I/O Connections
Pin
1
2
3
4
5
6
Function P9
Logic Ground
On/Off Control
+Output
Output Return
Input Return
+Input
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.
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
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
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.
© 2012 Murata Power Solutions, Inc.
www.murata-ps.com/support
UNR30-40W.B03
Page 4 of 4
京公网安备 11010802033920号
EEWORLD
