www.murata-ps.com
FEATURES
3-phase buck regulators for new
distributed 12V power architectures
12V input (10.2-13.8V range)
0.8/1/1.2/1.5/1.8/2/2.5/3.3/5V
OUT
@ 45-50A
Non-isolated, fixed-frequency,
synchronous-rectifier topology
¼-brick size, through hole or SMT
±1% setpoint accuracy
Efficiencies to 93.5% @ 45 Amps
Noise as low as 20mVp-p
Stable no-load operation
On/Off control, trim & sense functions
Output overvoltage protection
Input Over/Undervoltage lockout
Thermal shutdown
Designed to meet UL/IEC/EN60950-1
EMC compliant
LQN D12 Models
Non-Isolated, Single Output, 12V
IN
, 0.8-5V
OUT
45-50 Amp, ¼-Brick, DC/DC Converters
OBSOLETE PRODUCT
Typical unit
PRODUCT OVERVIEW
The LQN D12 Series of non-isolated quarter bricks
are ideal building blocks for emerging, on-board
power-distribution schemes in which isolated 12V
buses deliver power to any number of non-isolated,
step-down buck regulators. LQN D12 DC/DCs
accept a 12V input (10.2V to 13.8V input range)
and convert it, with the highest efficiency in the
smallest space, to a 0.8, 1, 1.2, 1.5, 1.8, 2, 2.5, 3.3
or 5 Volt output fully rated at 45-50 Amps.
LQN D12s are ideal POLPPs (point-of-use/load
power processors) and they typically require no ex-
ternal components. They occupy the standard quarter
brick board space (1.45" x 2.3") and come in either
through-hole packages or surface-mount packages
with a profile of only 0.4" (0.5" including heatsink).
The LQNs best-in-class power density is
achieved with a fully synchronous, fixed-frequency,
3-phase buck topology that delivers extremely
high efficiency (95% for 5V
OUT
models), low noise
(20mVp-p typ.), tight line/load regulation (±0.25%
max.), quick step response (70μsec), stable no-
load operation, and no output reverse conduction.
The fully functional LQN's feature input over/
undervoltage lockout, output overvoltage and
overcurrent detection, continuous short-circuit
protection, overtemperature protection, an
output-voltage trim function, a remote on/off
control pin, and sense pin. High efficiency enables
the LQN D12s to deliver rated output currents
of 50 Amps at high ambient temperatures and
minimal air flow.
If your new system boards call for multiple
supply voltages, check out the economics of
on-board 12V distributed power. If you don't need
to pay for multiple isolation barriers, MPS's non-
isolated LQN D12 brick's will save you money.
Figure 1. Simplified Schematic
➀
Only one phase of three shown.
Typical topology is shown.
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com
2009.09.14
email: sales@murata-ps.com
MDC_LQN D12 Models.B04
Page 1 of 15
LQN D12 Models
Non-Isolated, Single Output, 12V
IN
, 0.8-5V
OUT
45-50 Amp, ¼-Brick, DC/DC Converters
Performance Specifications and Ordering Guide
➀
Output
V
OUT
(Volts)
0.8
1
1.2
1.5
1.8
2
2.5
3.3
5
I
OUT
(Amps)
50
50
50
50
50
50
45
45
45
R/N (mVp-p)
➁
Typ.
30
30
20
20
20
20
20
30
20
Max.
50
50
50
50
50
50
50
50
40
Regulation (Max.)
➂
Line
±0.25%
±0.25%
±0.25%
±0.25%
±0.05%
±0.25%
±0.25%
±0.25%
±0.05%
Load
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.05%
V
IN
Nom.
(Volts)
12
12
12
12
12
12
12
12
12
Input
Range
(Volts)
10.2–3.8
10.2–3.8
10.2–3.8
10.2–3.8
10.2–3.8
10.2–3.8
10.2–3.8
10.2–3.8
10.2–3.8
I
IN
➃
(mA/A)
240/3.92
240/4.84
240/5.59
240/6.87
240/8.24
240/9.16
240/10.14
240/13.38
240/20.05
Efficiency
Min.
82%
80%
87%
88.5%
88.5%
88.5%
90%
90%
94%
Typ.
85%
86%
89.5%
91%
91%
91%
92.5%
92.5%
95%
Package
(Case, Pinout)
C41, C42, P62
C41, C42, P62
C41, C42, P62
C41, C42, P62
C41, C42, P62
C41, C42, P62
C41, C42, P62
C41, C42, P62
C41, C42, P62
Models
LQN-0.8/50-D12-C
LQN-1/50-D12-C
LQN-1.2/50-D12-C
LQN-1.5/50-D12-C
LQN-1.8/50-D12-C
LQN-2/50-D12-C
LQN-2.5/45-D12-C
LQN-3.3/45-D12-C
LQN-5/45-D12-C
➀
Typical at T
A
= +25°C under nominal line voltage and full-load conditions, unless
otherwise noted. All models are tested and specified with external 33μF input
capacitor and 470μF poscap output capacitor paralleled with a 100μF ceramic
output capacitor.
➁
Ripple/Noise (R/N) is tested/specified over a 20MHz bandwidth.
➂
These 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.
➃
Nominal line voltage, no-load/full-load conditions.
➄
The operating input voltage is 10.2V to 13.8V. However, 10.8V
IN
is required for the
DC/DC to properly start up under all line, load and temperature conditions. The 10.8V
potential must be maintained across the inputs until the output is up and regulating.
After the output is regulating, the operating input range is 10.2V to 13.8V.
➅
Please see part number structure for full part numbers and additional options.
PART NUMBER STRUCTURE
Model options
L QN
-
1.8
/
50
-
D12 M B
-
C
Output
Configuration:
L
= Unipolar
Low Voltage
Non-Isolated Quarter Brick
Nominal Output Voltage:
0.8, 1, 1.2, 1.5, 1.8,
2, 2.5, 3.3 or 5 Volts
Maximum Rated Output
Current in Amps
RoHS-6 hazardous sub-
stance compliant*
(Does not claim UE RoHS
exemption 7b – lead in
solder.)
Heat Transfer:
Blank =
No heatsink
or baseplate, standard
B =
Baseplate installed,
optional
H =
Heatsink installed,
optional
Mounting Method:
Blank
= Through-hole package,
standard
M =
Surface-mount package,
optional
Input Voltage Range:
D12
= 10.2 to 13.8 Volts
(12V nominal)
*
Contact Murata Power Solutions for availability.
Note:
Some model number combinations may not be
available. Contact Murata Power Solutions
(Datel).
www.murata-ps.com
2009.09.14
email: sales@murata-ps.com
MDC_LQN D12 Models.B04
Page 2 of 15
LQN D12 Models
Non-Isolated, Single Output, 12V
IN
, 0.8-5V
OUT
45-50 Amp, ¼-Brick, DC/DC Converters
MECHANICAL SPECIFICATIONS
0.44*
(11.2)
2.22 (56.4)
A
0.44*
(11.2)
2.22 (56.4)
A
PLASTIC STANDOFFS
ARE RELIEVED 0.030 (0.8)
IN SOLDER JOINT AREA
0.180 MIN.
(4.6)
PINS 2-4, 10:
0.040 ±0.001
(1.016 ±0.025)
PINS 1, 5-9:
0.062 ±0.001
(1.575 ±0.025)
COPPER SMT LEADS
COPLANAR TO 0.004
0.025
(0.6)
A
2.30 (58.4)
0.125 TYP.
(3.2)
B
B
1
2
3
4
5
6
1.35 (34.3)
7
8
9
10
1
2
3
0.110 TYP.
(2.8)
4
5
6
7
8
9
10
1.35 (34.3)
BOTTOM VIEW
*0.50 (12.7) WITH THE ADDITION
OF OPTIONAL HEATSINK OR BASEPLATE
0.600 (15.24)
4 EQ. SP. @ 0.150 (3.81)
BOTTOM VIEW
*0.50 (11.2) WITH THE ADDITION
OF OPTIONAL HEATSINK OR BASEPLATE.
0.79 (20.1) WITH HEAT SHIELD.
0.600 (15.24)
4 EQ. SP. @ 0.150 (3.81)
C41 Through-Hole Package
Dimensions are in inches (mm) shown for ref. only.
Third Angle Projection
C42 Surface-Mount Package
Pin
1
2
3
4
5
I/O Connections
Function P62
Pin
Input Common
6
7
V
OUT
Trim
N.C.*
8
Off/On Control
9
+Input
10
Function P62
Output Common
+Output
Output Common
+Output
+Sense In
*A "Power Good" output
is available on pin 3 under
special order.
Contact Murata Power
Solutions.
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
Components are shown for reference only.
See page 4 for LQN Series baseplate, heat sink,
and heat shield mechanical specifications.
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2009.09.14
email: sales@murata-ps.com
MDC_LQN D12 Models.B04
Page 3 of 15
B
B
0.122
(3.1)
2.00 (50.8)
A
LQN D12 Models
Non-Isolated, Single Output, 12V
IN
, 0.8-5V
OUT
45-50 Amp, ¼-Brick, DC/DC Converters
MECHANICAL SPECIFICATIONS
2.22 (56.4)
B
A
1.030 (26.2)
#M3 THREAD
X 0.15 DEEP
(4 PLACES)
0.31
(7.9)
1.720 (43.7)
A
B
1.110 (28.2)
DIMENSIONS ARE IN INCHES (MM)
1.860 (47.2)
A
2.22 (56.4)
A
0.31
(7.9)
1.720 (43.7)
A
B
B
LQN Series Heat Sink
2.30 (58.4)
1.110 (28.2)
1.35 (34.3)
#2-56 THREAD
X 0.13 DEEP
(4 PLACES)
0.79
(20.1)
0.057
(1.5)
DIMENSIONS ARE IN INCHES (MM)
LQN Series Baseplate
Dimensions are in inches (mm) shown for ref. only.
Third Angle Projection
1.52
(38.6)
DIMENSIONS ARE IN INCHES (MM)
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
Components are shown for reference only.
LQN Series Heat Shield for Surface-Mount Packages
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2009.09.14
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MDC_LQN D12 Models.B04
Page 4 of 15
1.35 (34.3)
#2-56 THREAD
X 0.20 DEEP
(4 PLACES)
B
LQN D12 Models
Non-Isolated, Single Output, 12V
IN
, 0.8-5V
OUT
45-50 Amp, ¼-Brick, DC/DC Converters
Performance/Functional Specifications
Typical at T
A
= +25°C under nominal input line voltage, nominal output voltage,
natural convection, external caps and full-load conditions unless otherwise noted.
[1]
Input
Line/Load Regulation
[10]
Efficiency
Maximum Capacitive Loading
V
OUT
Trim Range
Current Limit Inception
(98% of V
OUT
):
1 & 1.8V models
2.5 & 3.3V models
Short Circuit Detection
Short Circuit Protection Method
See Ordering Guide
See Ordering Guide
10,000μF (low ESR
≤0.004Ω)
±10% of V
NOMINAL
82A (cold start), 60A (warmed up)
85A (cold start), 70A (warmed up)
See Note 6
Hiccup with autorecovery
See Technical Notes
22 Amps typical, 25 Amps maximum
Continuous, output shorted to ground
120% of V
OUT
Method: comparator feedback
Dynamic Characteristics
Input Voltage Range
Start-Up Threshold
Overvoltage Shutdown
Undervoltage Shutdown
Input Current:
Normal Operating Conditions
Standby Mode (Off, Under Voltage)
Inrush transient
Output Short-Circuit Condition
Low Line Voltage (V
IN
= V
MIN
):
LQN-0.8/50-D12
LQN-1/50-D12
LQN-1.2/50-D12
LQN-1.5/50-D12
LQN-1.8/50-D12
LQN-2/50-D12
LQN-2.5/45-D12
LQN-3.3/45-D12
LQN-5/45-D12
Input Reflected Ripple Current
[2]
Input Filter Type
Overvoltage Protection
Reverse-Polarity Protection
No-load Input Current
Remote On/Off Control
[5]
Remote Control On/Off Current
Remote Sense Input Range
10.2-13.8 Volts (12V nominal)
[13]
9.4-10.8 Volts
14.3 Volts typical
9.5 Volts typical
See Ordering Guide
TBD mA
TBD A
2
sec
350mA
4.56 Amps
5.63 Amps
6.54 Amps
8.04 Amps
9.64 Amps
10.71 Amps
11.86 Amps
15.57 Amps
23.34 Amps
40mAp-p
Capacitive, 88μF
None
See external fuse information
240mA
Off = +2.8V to +V
IN
max.
On = open pin to +2V max.
1mA pulldown
+10% of V
OUT
nominal
Output
Short Circuit Current
Short Circuit Duration
Overvoltage Protection
Dynamic Load Response
(50% - 75% - 50% load step to ±2% of V
OUT
final value)
All models
70μsec
Start-Up Time
(On/Off or V
IN
on to V
OUT
regulated)
Switching Frequency
Maximum Output Capacitive Load
10msec for V
OUT
= nominal
690kHz ±30kHz
10,000μF, low ESR, 0.004Ω
Environmental
Calculated MTBF
[4]
TBC Hours
Operating Temperature Range:
(Ambient)
[9]
See Derating Curves
–40 to +85°C, with derating
Storage Temperature Range
Thermal Protection/Shutdown
Relative Humidity
–40 to +125°C
+115°C (PC board)
To +85%/+85°C, non-condensing
Physical
Outline Dimensions
Pin Material
[11]
See Mechanical Specifications
Through-hole: Gold-plated copper alloy
Surface mount: Pure tin over nickel-plated
copper alloy
1.1 ounces (31 grams)
UL94V-0
Designed to meet FCC Part 15,
EN55022, Class A
Designed to meet UL/cUL 60950-1,
CSA-C22.2 No.234, IEC/EN 60950-1
Total Output Power
(V
OUT
x I
OUT
must not exceed maximum power)
[3]
LQN-0.8/50-D12
40 Watts
LQN-1/50-D12
50 Watts
LQN-1.2/50-D12
60 Watts
LQN-1.5/50-D12
75 Watts
LQN-1.8/50-D12
90 Watts
LQN-2/50-D12
100 Watts
LQN-2.5/45-D12
112.5 Watts
LQN-3.3/45-D12
148.5 Watts
LQN-5/45-D12
225 Watts
Voltage Output Accuracy:
Initial
Temperature Coefficient
Extreme
[12]
Minimum Loading
[1]
Ripple/Noise
(20 MHz bandwidth)
[8]
±1% of V
NOMINAL
±0.02% of V
OUT
per
°C
±3% of V
NOMINAL
No minimum load
See Ordering Guide
Weight
(no heatsink)
Flammability Rating
Electromagnetic Interference
(conducted or radiated)
Safety
www.murata-ps.com
2009.09.14
email: sales@murata-ps.com
MDC_LQN D12 Models.B04
Page 5 of 15
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