+INPUT
(7,8)
COMMON
(6)
PWM
CONTROLLER
CURRENT
SENSE
REFERENCE &
ERROR AMP
V
CC
ON/OFF
CONTROL
(11)
V
OUT
TRIM
(10)
+OUTPUT
(1,2,4)
330µF100µF
66µF
10.5Ω
+SENSE
(3)
COMMON
(5)
➀
Features
Figure 1. Simplified Schematic
LSN Series D12 SIP's (single-in-line packages) 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. LSN D12 DC/DC's accept a 12V input (10.8V
to 13.2V input range) and convert it, with the highest efficiency in the
smallest space, to a 1, 1.1, 1.2, 1.3, 1.5, 1.8, 2, 2.5, 3.3 or 5 Volt output
fully rated at 10 Amps.
LSN D12's are ideal point-of-use/load power processors. They typi-
cally require no external components. Their vertical-mount packages
occupy a mere 0.7 square inches (4.5 sq. cm), and reversed pin vertical
mount allows mounting to meet competitor's keep out area. Horizontal-
mount packages ("H" suffix) are only 0.34 inches (8.6mm) high.
The LSN's best-in-class power density is achieved with a fully
synchronous, fixed-frequency, buck topology that also delivers: high
efficiency (96% for 5VOUT models), low noise (30 to 50mVp-p typ.),
tight line/load regulation (±0.1%/±0.25% max.), quick step response
(100µsec), stable no-load operation, and no output reverse conduction.
The fully functional LSN’s feature output overcurrent detection,
continuous short-circuit protection, an output-voltage trim function, a
remote on/off control pin
(pull high to disable), thermal shutdown and a sense pin. High efficiency
enables
the LSN D12's to deliver rated output currents of 10 Amps at ambient
temperatures
to +68°C with 100 lfm air flow.
If your new system boards call for three or more supply voltages,
check out the economics of on-board 12V distributed power. If you don't
need to pay for multiple isolation barriers, DATEL's non-isolated LSN
D12 SIP's will save you money.
■
■
■
■
■
■
■
■
■
■
■
Step-down buck regulators for new
distributed 12V power architectures
12V input (10.8-13.2V range)
1 to 5VOUT @10A
Non-isolated, fixed-frequency,
synchronous-rectifier topology
Outstanding performance:
• ±1.25% setpoint accuracy
• Efficiencies to 96% @ 10 Amps
• Noise as low as 30mVp-p
• Stable no-load operation
• Trimmable output voltage
Remote on/off control
Sense pin on standard models
Thermal shutdown
No derating to +68°C with 100 lfm
UL/IEC/EN60950 certified
EMC compliant
Typical topology is shown
➀ For devices with the sense-pin removed ("B" suffix),
the feedback path is through the +Output pin and not
the +Sense pin.
LSN-10A D12 Models
Single Output, Non-Isolated, 12VIN, 1-5VOUT, 10A, DC/DC's in SIP Packages
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MDC_LSN10A-D12.B01 Page 1 of 12
LSN-1/10-D12 1 10 45 65 ±0.1% ±0.25% 12 10.8-13.2 39/1.02 83% 86% 86% B5/B5x, P59
LSN-1.1/10-D12 1.1 10 45 60 ±0.1% ±0.25% 12 10.8-13.2 45/1.1 85% 88% 87.5% B5/B5x, P59
LSN-1.2/10-D12 1.2 10 45 60 ±0.1% ±0.25% 12 10.8-13.2 45/1.19 85% 88% 87.5% B5/B5x, P59
LSN-1.3/10-D12 1.3 10 45 60 ±0.1% ±0.25% 12 10.8-13.2 45/1.3 85% 88% 87.5% B5/B5x, P59
LSN-1.5/10-D12 1.5 10 30 45 ±0.1% ±0.25% 12 10.8-13.2 54/1.47 86% 89% 88% B5/B5x, P59
LSN-1.8/10-D12 1.8 10 30 45 ±0.1% ±0.25% 12 10.8-13.2 53/1.75 87% 90.5% 89.5% B5/B5x, P59
LSN-2/10-D12 2 10 30 45 ±0.1% ±0.25% 12 10.8-13.2 59/1.9 88.5% 91% 90% B5/B5x, P59
LSN-2.5/10-D12 2.5 10 35 50 ±0.1% ±0.25% 12 10.8-13.2 60/2.3 90.5% 92.5% 92% B5/B5x, P59
LSN-3.3/10-D12 3.3 10 40 55 ±0.1% ±0.25% 12 10.8-13.2 69/3 92.5% 94% 93.5% B5/B5x, P59
LSN-3.8/10-D12 3.8 10 40 55 ±0.1% ±0.25% 12 10.8-13.2 69/3.33 93% 95% N/A B5/B5x, P59
LSN-5/10-D12 5 10 50 75 ±0.1% ±0.25% 12 10.8-13.2 75/4.5 94% 96% 95.5% B5/B5x, P59
1234576891011
2.00
(50.80)
0.030 ±0.001 DIA.
(0.762 ±0.025)
0.55
(13.97)
0.34
(8.64)
0.20
(5.08)
0.110
(2.79)
0.046
(1.17)
0.05
(1.27)
0.400
(10.16)
4 EQ. SP. @
0.100 (2.54)
0.500
(12.70)
5 EQ. SP. @
0.100 (2.54)
1.000
(25.40)
0.17
(4.32)
LAYOUT P ATTERN
TOP VIEW
0.34
(8.64)
0.25
(6.35)
➀ Typical at TA = +25°C under nominal line voltage and full-load conditions, unless noted. All
models are tested and specified with external 22µF tantalum input and output capacitors. The
capacitors are necessary to accommodate our test equipment and may not be required to
achieve specified performance in your applications. See I/O Filtering and Noise Reduction.
➁ Ripple/Noise (R/N) is tested/specified over a 20MHz bandwidth and may be reduced with
external filtering. See I/O Filtering and Noise Reduction for details.
MECHANICAL SPECIFICATIONS
Case B5
Vertical Mounting
(Standard)
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 These are not complete model numbers. Please refer to the Part Number Structure when
ordering.
PART NUMBER STRUCTURE
* Pin 3 (+Sense) removed
for "B" suffix models.
0.35
(8.89)
0.21
(5.33)
0.16
(4.06)
0.360
(9.14)
1 2 3 4 5 76 8 9
ISOLATING
PAD
10 11
2.00
(50.80)
0.030 ±0.001 DIA.
(0.762 ±0.025)
0.55
(13.97)
0.05
(1.27)
0.05
(1.27)
0.55
(13.97)
0.50
(12.7)
0.400
(10.16)
0.56
(14.22)
0.53
(13.46)
4 EQ. SP. @
0.100 (2.54)
0.500
(12.70)
5 EQ. SP. @
0.100 (2.54)
1.000
(25.40)
LAYOUT PATTERN
TOP VIEW
RECOMMENDED
COPPER PAD
ON PCB (0.55 SQ. IN.)
Case B5A
Horizontal Mounting
Performance Specifications and Ordering Guide ➀
Package
VOUT IOUT VIN Nom. Range IIN ➃ (Case,
Root Model ➄ (Volts) (Amps) Typ. Max. Line Load (Volts) (Volts) (mA/A) Min. Typ. Typ. Pinout)
Output Input
R/N (mVp-p) ➁ Regulation (Max.) ➂
Efficiency
Full Load ½ Load
LAYO UT P ATTERN
TOP VIEW
0.36
(9.14)
0.20
(5.08)
0.106
(2.69)
0.046
(1.17)
0.36
(9.14)
0.306
(7.8)
1234576891011
2.00
(50.80)
0.030 ±0.001 DIA.
(0.762 ±0.025)
0.55
(13.97)
0.05
(1.27)
0.400
(10.16)
4 EQ. SP. @
0.100 (2.54)
0.500
(12.70)
5 EQ. SP. @
0.100 (2.54)
1.000
(25.40)
0.17
(4.32)
Case B5B
Reverse Pin
Vertical Mounting
(Tyco-compatible)
Pin Function P59* Pin Function P59* Pin Function P59*
1 +Output 5 Common 9 No Pin
2 +Output 6 Common 10 VOUT Tr i m
3 +Sense * 7 +Input 11 On/Off Control
4 +Output 8 +Input
I/O Connections
Maximum Rated Output
Current in Amps
Non-Isolated SIP
Output
Configuration:
L = Unipolar
Low Voltage
Nominal Output Voltage:
1, 1.1, 1.2, 1.3, 1.5, 1.8, 2, 2.5, 3.3
or 5 Volts
Input Voltage Range:
D12 = 10.8 to 13.2 Volts (12V nominal)
L SN 10-/D12 B-1.8
B Suffix:
No Remote Sense (Pin 3 removed)
H
H Suffix:
Horizontal Mount
J
J Suffix:
Reversed Pin
Vertical Mount
-
RoHS-6
compliant*
C
Note: Not all model number
combinations are available.
Contact Murata Power Solutions * Contact Murata Power Solutions Technologies
(DATEL) for availability.
DIMENSIONS IN INCHES (mm)
LSN-10A D12 Models
Single Output, Non-Isolated, 12VIN, 1-5VOUT, 10A, DC/DC's in SIP Packages
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000www.murata-ps.com
MDC_LSN10A-D12.B01 Page 2 of 12
Input
Input Voltage Range 10.8-13.2 Volts (12V nominal)
Input Current:
Normal Operating Conditions See Ordering Guide
Inrush Transient 0.08A2sec
Standby/Off Mode 8mA
Output Short-Circuit Condition ➁ 40mA average
Input Reflected Ripple Current ➁ 100mAp-p
Input Filter Type Capacitive (66µF)
Overvoltage Protection None
Reverse-Polarity Protection None
Undervoltage Shutdown None
On/Off Control ➁ ➂ On = open (internal pull-down)
Off = +2.8V to +VIN (<3mA)
Output
VOUT Accuracy (50% load) ±1.25% maximum
Minimum Loading ➀ No load
Maximum Capacitive Load 2000µF (low ESR, OSCON)
VOUT Trim Range ➁ ±10%
Ripple/Noise (20MHz BW) ➀ ➁ ➃ See Ordering Guide
Total Accuracy 3% over line/load/temperature
Efficiency ➁ See Ordering Guide
Overcurrent Detection and Short-Circuit Protection: ➁
Current-Limiting Detection Point 17 (13-23.5) Amps
Short-Circuit Detection Point 98% of VOUT set
SC Protection Technique Hiccup with auto recovery
Short-Circuit Current 400mA average
Dynamic Characteristics
Transient Response (50% load step) 100µsec to ±2% of final value
Start-Up Time: ➁
VIN to VOUT and On/Off to VOUT 70msec for VOUT = 1V
16msec for VOUT = 1.1V to 5V
Switching Frequency:
1V/1.1V, 1.2V, 1.3 Models 105/125kHz ±10%
1.5V/1.8V, 2V Models 160/177kHz ±10%
2.5V, 3.3V, 5V Models 200kHz ±7.5%
Environmental
Calculated MTBF ➄ 2.3 -1.8 million hours (1VOUT to 5VOUT)
Operating Temperature: (Ambient) ➁
Without Derating (Natural convection) –40 to +48/64°C (model dependent)
With Derating See Derating Curves
Thermal Shutdown +115°C
Physical
Dimensions See Mechanical Specifications
Pin Dimensions/Material 0.03" (0.76mm) round copper alloy with
tin plate over nickel underplate
Weight 0.3 ounces (8.5g)
Flamability Rating UL94V-0
Safety UL/cUL/IEC/EN 60950, CSA-C22.2 No. 234
Performance/Functional Specifications
Typical @ TA = +25°C under nominal line voltage and full-load conditions unless noted. ➀
➀ All models are tested/specified with external 22µF input/output capacitors.These caps
accommodate our test equipment and may not be required to achieve specified performance
in your applications. All models are stable and regulate within spec under no-load conditions.
➁ See Technical Notes and Performance Curves for details.
➂ The On/Off Control (pin 11) is designed to be driven with open-collector logic or the appli-
cation of appropriate voltages (referenced to Common, pins 5 and 6).
➃ Output noise may be further reduced with the installation of additional external output
filtering. See I/O Filtering and Noise Reduction.
➄ MTBF’s are calculated using Telcordia SR-332(Bellcore), ground fixed, TA = +25°C, full
power, natural convection, +67°C pcb temperature.
TECHNICAL NOTES
Input Voltage:
Continuous or transient 15 Volts
On/Off Control (Pin 11) +VIN
Input Reverse-Polarity Protection None
Output Overvoltage Protection None
Output Current Current limited. Devices can
withstand sustained output short
circuits without damage.
Storage Temperature –40 to +125°C
Lead Temperature (soldering, 10 sec.) +300°C
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.
Absolute Maximum Ratings
Return Current Paths
The LSN D12 SIP’s are non-isolated DC/DC converters. Their two Common
pins (pins 5 and 6) are connected to each other internally (see Figure 1). To
the extent possible (with the intent of minimizing ground loops), input return
current should be directed through pin 6 (also referred to as –Input or Input
Return), and output return current should be directed through pin 5 (also
referred to as –Output or Output Return). Any on/off control signals applied to
pin 11 (On/Off Control) should be referenced to Common
(specifically pin 6).
I/O Filtering and Noise Reduction
All models in the LSN D12 Series are tested and specified with external
22µF tantalum input and output capacitors. These capacitors are necessary
to accommodate our test equipment and may not be required to achieve?
desired performance in your application. The LSN D12's are designed with
high-quality, high-performance internal I/O caps, and will operate within spec
in most applications with no additional external components.
In particular, the LSN D12's input capacitors are specified for low ESR
and are fully rated to handle the units' input ripple currents. Similarly, the
internal output capacitors are specified for low ESR and full-range frequency
response. As shown in the Performance Curves, removal of the external
22µF tantalum output caps has minimal effect on output noise.
In critical applications, input/output ripple/noise may be further reduced using
filtering techniques, the simplest being the installation of external I/O caps.
External input capacitors serve primarily as energy-storage devices. They
minimize high-frequency variations in input voltage (usually caused by IR
drops in conductors leading to the DC/DC) as the switching converter draws
pulses of current. Input capacitors should be selected for bulk capacitance
(at appropriate frequencies), low ESR, and high rms-ripple-current ratings.
The switching nature of modern DC/DC's requires that the dc input voltage
source have low ac impedance at the frequencies of interest. Highly inductive
source impedances can greatly affect system stability. Your specific system
configuration may necessitate additional considerations.
Output ripple/noise (also referred to as periodic and random deviations or
PARD) may be reduced below specified limits with the installation of addi-
tional external output capacitors. Output capacitors function as true filter
LSN-10A D12 Models
Single Output, Non-Isolated, 12VIN, 1-5VOUT, 10A, DC/DC's in SIP Packages
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000www.murata-ps.com
MDC_LSN10A-D12.B01 Page 3 of 12
elements and should be selected for bulk capacitance, low ESR, and appro-
priate frequency response. Any scope measurements of PARD should be
made directly at the DC/DC output pins with scope probe ground less than
0.5" in length.
All external capacitors should have appropriate voltage ratings and be located
as close to the converters as possible. Temperature variations for all relevant
parameters should be taken into consideration.
The most effective combination of external I/O capacitors will be a function
of your line voltage and source impedance, as well as your particular load and
layout conditions. Our Applications Engineers can recommend potential solu-
tions and discuss the possibility of our modifying a given device’s internal filter-
ing to meet your specific requirements. Contact our Applications Engineering
Group for additional details.
Input Fusing
Most applications and or safety agencies require the installation of fuses
at the inputs of power conversion components. LSN D12 Series DC/DC
converters are not internally fused. Therefore, if input fusing is mandatory,
either a normal-blow or a slow-blow fuse with a value no greater than 9 Amps
should be installed within the ungrounded input path to the converter.
As a rule of thumb however, we recommend to use a normal-blow or slow-
blow fuse with a typical value of about twice the maximum input current,
calculated at low line with the converters minimum efficiency.
Safety Considerations
LSN D12 SIP's are non-isolated DC/DC converters. In general, all DC/DC's
must be installed, including considerations for I/O voltages and spacing/
separation requirements, in compliance with relevant safety-agency speci-
fications (usually UL/IEC/EN60950).
In particular, for a non-isolated converter's output voltage to meet SELV
(safety extra low voltage) requirements, its input must be SELV compliant.
If the output needs to be ELV (extra low voltage), the input must be ELV.
Input Overvoltage and Reverse-Polarity Protection
LSN D12 SIP Series DC/DC's do not incorporate either input overvoltage
or input reverse-polarity protection. Input voltages in excess of the specified
absolute maximum ratings and input polarity reversals of longer than "instan-
taneous" duration can cause permanent damage to these devices.
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 (10.8 Volts) and the fully loaded output voltage enters and remains
within its specified accuracy band. Actual measured times will vary with input
source impedance, external input capacitance, and the slew rate and final
value of the input voltage as it appears to the converter.
The On/Off to VOUT Start-Up Time assumes the converter is turned off via the
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.
On/Off Control and Power-up Sequencing
The On/Off Control pin may be used for remote on/off operation. LSN D12 SIP
Series DC/DC's are designed so they are enabled when the control pin is
left open (internal pull-down to Common) and disabled when the control pin is
pulled high (+2.8V to +VIN), as shown in Figure 2 and 2a.
Dynamic control of the on/off function is best accomplished with a mechanical
relay or open-collector/open-drain drive circuit. The drive circuit should be
able to sink appropriate current when activated and withstand appropriate
voltage when deactivated.
Figure 2. Driving the On/Off Control Pin with an Open-Collector Drive Circuit
+INPUT
COMMON
10kΩ
4.12kΩ
1.62kΩ
ON/OFF
CONTROL
Remote Sense
LSN D12 SIP Series DC/DC converters offer an output sense function on
pin 3.
The sense function enables point-of-use regulation for overcoming
moderate IR drops in conductors and/or cabling. Since these are non-isolated
devices whose inputs and outputs usually share the same ground plane,
sense is provided only for the +Output.
The remote sense line is part of the feedback control loop regulating the
DC/DC converter’s output. The sense line carries very little current and
consequently requires a minimal cross-sectional-area conductor. As such, it
is not a low-impedance point and must be treated with care in layout and
cabling. Sense lines should be run adjacent to signals (preferably ground),
and in cable and/or discrete-wiring applications, twisted-pair or similar tech-
niques should be used. To prevent high frequency voltage differences between
VOUT and Sense, we recommend installation of a 1000pF capacitor close to
the converter.
The sense function is capable of compensating for voltage drops between the
+Output and +Sense pins that do not exceed 10% of VOUT.
[VOUT(+) – Common] – [Sense(+) – Common] ≤ 10%VOUT
Power derating (output current limiting) is based upon maximum output cur-
rent and voltage at the converter's output pins. Use of trim and sense func-
tions can cause the output voltage to increase, thereby increasing output
power beyond the LSN's specified rating. Therefore:
(VOUT at pins) x (IOUT) ≤ rated output power
The internal 10.5Ω resistor between +Sense and +Output (see Figure 1)
serves to protect the sense function by limiting the output current flowing
through the sense line if the main output is disconnected. It also prevents
output voltage runaway if the sense connection is disconnected.
Note: Connect the +Sense pin (pin 3) to +Output (pin 4) at the DC/DC
converter pins, if the sense function is not used for remote regulation.
LSN-10A D12 Models
Single Output, Non-Isolated, 12VIN, 1-5VOUT, 10A, DC/DC's in SIP Packages
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000www.murata-ps.com
MDC_LSN10A-D12.B01 Page 4 of 12
Output Voltage Trimming
Allowable trim ranges for each model in the LSN D12 SIP Series are ±10%.
Trimming is accomplished with either a trimpot or a single fixed resistor. The
trimpot should be connected between +Output and Common with its wiper
connected to the Trim pin as shown in Figure 3 below.
A trimpot can be used to determine the value of a single fixed resistor
which can then 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
Common to trim up the output voltage. Fixed resistors should have absolute
TCR’s less than 100ppm/°C to ensure stability.
Figure 4. Trim Connections Using Fixed Resistors
Note:
Install either a fixed
trim-up resistor
or a fixed trim-down
resistor depending upon
desired output voltage.
Output Overvoltage Protection
LSN D12 SIP Series DC/DC converters do not incorporate output overvolt-
age protection. In the extremely rare situation in which the device’s feedback
loop is broken, the output voltage may run to excessively high levels (VOUT =
VIN). 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.
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 inductors, FET's and diodes are at the highest
risk. LSN D12 SIP Series DC/DC converters incorporate an output overcur-
rent detection and shutdown function that serves to protect both the power
converter and its load.
If the output current exceeds it maximum rating by typically 70% (17 Amps) or
if the output voltage drops to less than 98% of it original value, the LSN D12's
internal overcurrent-detection circuitry immediately turns off the converter,
which then goes into a "hiccup" mode. While hiccupping, the converter will
continuously attempt to restart itself, go into overcurrent, and then shut down.
Under these conditions, the average output current will be approximately
400mA, and the average input current will be approximately 40mA. Once the
output short is removed, the converter will automatically restart itself.
Figure 3. Trim Connections Using a Trimpot
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K7

4URNS
).054
#/--/.
#/--/.
/54054
42)-
4R I M
$OWN
4RIM
5P
,/!$
).054
#/--/.
/54054
42)-
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Trim Equations
Note: Resistor values are in kΩ. Accuracy of adjustment is subject to
tolerances of resistors and factory-adjusted, initial output accuracy.
VO = desired output voltage. VONOM = nominal output voltage.
The equations below can be used as starting points for selecting specific trim-
resistor values. Recall, untrimmed devices are guaranteed to be ±1% accurate.
Adjustment beyond the specified ±10% adjustment range is not recommended.
The on/off control function, however, can be externally inverted so that the
converter will be disabled while the input voltage is ramping up and then
"released" once the input has stabilized.
For a controlled start-up of one or more LSN-D12's, or if several output
voltages need to be powered-up in a given sequence, the On/Off Control pin
can be pulled high (external pull-up resistor, converter disabled) and then
driven low with an external open collector device to enable the converter.
Figure 2a. Inverting On/Off Control Pin Signal and Power-Up Sequencing
+INPUT
COMMON
10kΩ
4.12kΩ
5.6kΩ
1.62kΩ
ON/OFF
CONTROL
LSN-10A D12 Models
Single Output, Non-Isolated, 12VIN, 1-5VOUT, 10A, DC/DC's in SIP Packages
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000www.murata-ps.com
MDC_LSN10A-D12.B01 Page 5 of 12
Thermal Considerations and Thermal Protection
The typical output-current thermal-derating curves shown below enable
designers to determine how much current they can reliably derive from each
model of the LSN D12 SIP's under known ambient-temperature and air-flow
conditions. Similarly, the curves indicate how much air flow is required to
reliably deliver a specific output current at known temperatures.
The highest temperatures in LSN D12 SIP's occur at their output inductor,
whose heat is generated primarily by I2R losses. The derating curves were
developed using thermocouples to monitor the inductor temperature and
Typical Performance Curves for LSN D12 SIP Series
89
87
85
83
81
79
77
75
LSN-1/10-D12
Efficiency vs. Line Voltage and Load Current
1 2 3 4 5 6 7 8 9 10
Load Current (Amps)
Efficiency (%)
V
IN
= 10.8V
V
IN
= 12V
V
IN
= 13.2V
–40 060708090 100 110
LSN-1/10-D12
Output Current vs. Ambient Temperature
(Vertical mount, air flow direction from pin 11 to pin 1)
Output Current (Amps)
Ambient Temperature (°C)
12
10
8
6
4
2
0
Natural Convection
200 lfm
100 lfm
Output Reverse Conduction
Many DC/DC's using synchronous rectification suffer from Output Reverse
Conduction. If those devices have a voltage applied across their output before
a voltage is applied to their input (this typically occurs when another power
supply starts before them in a power-sequenced application), they will either
fail to start or self destruct. In both cases, the cause is the "freewheeling" or
"catch" FET biasing itself on and effectively becoming a short circuit.
LSN D12 SIP DC/DC converters are not damaged from Output Reverse
Conduction. They employ proprietary gate drive circuitry which makes them
immune to applied voltages during the startup sequence. If you are using
an external power source paralleled with the LSN, be aware that during the
start up phase, some low impedance condition or transient current may be
absorbed briefly into the LSN output terminals before voltage regulation is
fully established. You should insure that paralleled external power sources are
not disrupted by this condition during LSN start up.
varying the load to keep that temperature below +110°C under the assorted
conditions of air flow and air temperature. Once the temperature exceeds
+115°C (approx.), the thermal protection will disable the converter. Automatic
restart occurs after the temperature has dropped below +110°C.
All but the last two DUT's were vertical-mount models, and the direction of air
flow was parallel to the unit in the direction from pin 11 to pin 1.
As you may deduce from the derating curves and observe in the efficiency
curves on the following pages, LSN D12 SIP's maintain virtually constant
efficiency from half to full load, and consequently deliver very impressive
temperature performance even if operating at full load.
Lastly, when LSN D12 SIP's are installed in system boards, they are obvi-
ously subject to numerous factors and tolerances not taken into account here.
If you are attempting to extract the most current out of these units under
demanding temperature conditions, we advise you to monitor the output-
inductor temperature to ensure it remains below +110°C at all times.
Thermal Performance for "H" Models
Enhanced thermal performance can be achieved when LSN D12 SIP's are
mounted horizontally ("H" models) and the output inductor (with its electrically
isolating, thermally conductive pad installed) is thermally coupled to a copper
plane/pad (at least 0.55 square inches in area) on the system board. Your
conditions may vary, however our tests indicate this configuration delivers a
16°C to 22°C improvement in ambient operating temperatures. See page 9
for thermal comparison of two horizontally mounted units.
LSN-10A D12 Models
Single Output, Non-Isolated, 12VIN, 1-5VOUT, 10A, DC/DC's in SIP Packages
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000www.murata-ps.com
MDC_LSN10A-D12.B01 Page 6 of 12
91
89
87
85
83
81
79
77
75
LSN-1.1/10-D12, LSN-1.2/10-D12, LSN-1.3/10-D12
Efficiency vs. Line Voltage and Load Current
123 45678910
Load Current (Amps)
Efficiency (%)
V
IN
= 10.8V
V
IN
= 12V
V
IN
= 13.2V
–40 060708090 100 110
LSN-1.1/10-D12, LSN-1.2/10-D12, LSN-1.3/10-D12
Output Current vs. Ambient Temperature
(Vertical mount, air flow direction from pin 11 to pin 1)
Output Current (Amps)
Ambient Temperature (°C)
12
10
8
6
4
2
0
Natural Convection
200 lfm
100 lfm
91
89
87
85
83
81
79
77
75
LSN-1.5/10-D12
Efficiency vs. Line Voltage and Load Current
123 45678910
Load Current (Amps)
Efficiency (%)
V
IN
= 10.8V
V
IN
= 12V
V
IN
= 13.2V
93
91
89
87
85
83
81
79
77
75
LSN-1.8/10-D12
Efficiency vs. Line Voltage and Load Current
123 45678910
Load Current (Amps)
Efficiency (%)
V
IN
= 10.8V
V
IN
= 12V
V
IN
= 13.2V
Typical Performance Curves for LSN D12 SIP Series
–40 060708090 100 110
LSN-1.5/10-D12
Output Current vs. Ambient Temperature
(Vertical mount, air flow direction from pin 11 to pin 1)
Output Current (Amps)
Ambient Temperature (°C)
12
10
8
6
4
2
0
Natural Convection
200 lfm
100 lfm
–40 060708090 100 110
LSN-1.8/10-D12
Output Current vs. Ambient Temperature
(Vertical mount, air flow direction from pin 11 to pin 1)
Output Current (Amps)
Ambient Temperature (°C)
12
10
8
6
4
2
0
Natural Convection
200 lfm
100 lfm
LSN-10A D12 Models
Single Output, Non-Isolated, 12VIN, 1-5VOUT, 10A, DC/DC's in SIP Packages
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000www.murata-ps.com
MDC_LSN10A-D12.B01 Page 7 of 12
95
93
91
89
87
85
83
81
79
77
75
LSN-3.3/10-D12
Efficiency vs. Line Voltage and Load Current
123 45678910
Load Current (Amps)
Efficiency (%)
V
IN
= 10.8V
V
IN
= 12V
V
IN
= 13.2V
94
92
90
88
86
84
82
80
78
76
74
LSN-2.5/10-D12
Efficiency vs. Line Voltage and Load Current
123 45678910
Load Current (Amps)
Efficiency (%)
V
IN
= 10.8V
V
IN
= 12V
V
IN
= 13.2V
Typical Performance Curves for LSN D12 SIP Series
–40 05060708090 100 110
LSN-2.5/10-D12
Output Current vs. Ambient Temperature
(Vertical mount, air flow direction from pin 11 to pin 1)
Output Current (Amps)
Ambient Temperature (°C)
12
10
8
6
4
2
0
Natural Convection
200 lfm
100 lfm
–40 05060708090 100 110
LSN-3.3/10-D12
Output Current vs. Ambient Temperature
(Vertical mount, air flow direction from pin 11 to pin 1)
Output Current (Amps)
Ambient Temperature (°C)
12
10
8
6
4
2
0
Natural Convection
200 lfm
100 lfm
93
91
89
87
85
83
81
79
77
75
LSN-2/10-D12
Efficiency vs. Line Voltage and Load Current
123 45678910
Load Current (Amps)
Efficiency (%)
V
IN
= 10.8V
V
IN
= 12V
V
IN
= 13.2V
–40 05060708090 100 110
LSN-2/10-D12
Output Current vs. Ambient Temperature
(Vertical mount, air flow direction from pin 11 to pin 1)
Output Current (Amps)
Ambient Temperature (°C)
12
10
8
6
4
2
0
Natural Convection
200 lfm
100 lfm
LSN-10A D12 Models
Single Output, Non-Isolated, 12VIN, 1-5VOUT, 10A, DC/DC's in SIP Packages
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000www.murata-ps.com
MDC_LSN10A-D12.B01 Page 8 of 12
98
96
94
92
90
88
86
84
82
LSN-5/10-D12
Efficiency vs. Line Voltage and Load Current
123 45678910
Load Current (Amps)
Efficiency (%)
V
IN
= 10.8V
V
IN
= 12V
V
IN
= 13.2V
–40 0405060708090 100
LSN-5/10-D12
Output Current vs. Ambient Temperature
(Vertical mount, air flow direction from pin 11 to pin 1)
Output Current (Amps)
Ambient Temperature (°C)
12
10
8
6
4
2
0
Natural Convection
200 lfm
100 lfm
–40 05060708090 100 110
LSN-1/10-D12H (Horizontal Mount)
Output Current vs. Ambient Temperature
(Air flow direction from pin 11 to pin 1)
Output Current (Amps)
Ambient Temperature (°C)
12
10
8
6
4
2
0
Natural Convection
200 lfm
100 lfm
–40 0405060708090 100
LSN-5/10-D12H (Horizontal Mount)
Output Current vs. Ambient Temperature
(Air flow direction from pin 11 to pin 1)
Output Current (Amps)
Ambient Temperature (°C)
12
10
8
6
4
2
0
Natural Convection
200 lfm
100 lfm
Input Reflected Ripple Current
(VIN = 12V, VOUT = 5V/10A, CIN/COUT = 22µF)
2µsec/div
20mA/div
Input Inrush Current
(VIN = 12V, 7000µF as Input Switch)
10µsec/div
20A/div
Typical Performance Curves for LSN D12 SIP Series
LSN-10A D12 Models
Single Output, Non-Isolated, 12VIN, 1-5VOUT, 10A, DC/DC's in SIP Packages
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000www.murata-ps.com
MDC_LSN10A-D12.B01 Page 9 of 12
Dynamic Load Response
(VIN = 12V, VOUT = 5V/50 to 100% Load Step, CIN/COUT = 22µF)
100µs/div
20mV/div
Channel 2
Channel 1
Dynamic Load Response
(VIN = 12V, VOUT = 5V, 0 - 100% Load Step, CIN = 22µF, COUT = 2000µF OSCON)
100µs/div
50mV/div
Channel 2
Channel 1
Output Ripple Noise
(VIN = 12V, VOUT = 5V, Full Load, COUT = 22µF)
1µsec/div
10mV/div
Output Ripple/Noise
(VIN = 12V, VOUT = 5V, Full Load, COUT = 2000µF OSCON)
1µsec/div
10mV/div
Typical Performance Curves for LSN D12 SIP Series
Power-Up From VIN
(VIN = 12V, VOUT = 5V/10A, CIN = 22µF, Output Filter 22µF-700nH-150µF)
4msec/div
Channel 1: 2V/div Channel 2: 5V/div
Power-Up From VIN
(VIN = 12V, VOUT = 5V/10A, CIN = 22µF, COUT = 2000µF OSCON)
4msec/div
Channel 1: 2V/div Channel 2: 5V/div
LSN-10A D12 Models
Single Output, Non-Isolated, 12VIN, 1-5VOUT, 10A, DC/DC's in SIP Packages
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000www.murata-ps.com
MDC_LSN10A-D12.B01 Page 10 of 12
Output Hiccup
(VIN = 12V/Output Short, CIN/COUT = 22µF)
20msec/div
1V/div
(IIN = 39mA average, IOUT = 408mA average)
Short Circuit Output Current
(10A/div, Period = 72msec)
400µsec/div
10A/div
LSN-5/10-D12 Radiated Emissions
EN55022 Class B, 10 Meters
Converter Output = +5Vdc @ +10 Amps
80
70
60
50
40
30
20
10
0
–10
–20
Frequency (MHz)
100 1000
Radiated Emissions
EN 55022 Class B Limit
Radiated Emissions (dBµV/M)
80
70
60
50
40
30
20
10
0
–10
–20
Frequency (MHz)
100 1000
FCC Class B Limit
LSN-5/10-D12 Radiated Emissions
FCC Part 15 Class B, 3 Meters
Converter Output = +5Vdc @ 10 Amps
Radiated Emissions (dBµV/M)
Radiated Emissions
If you’re designing with EMC in mind, please note that all of DATEL’s
LSN D12 DC/DC Converters have been characterized for conducted and
radiated emissions in our EMI/EMC laboratory. Testing is conducted in an
EMCO 5305 GTEM test cell utilizing EMCO automated EMC test software.
Conducted/Radiated emissions are tested to the limits of FCC Part 15, Class
B and CISPR 22 (EN 55022), Class B. Correlation to other specifications can
be supplied upon request. The corresponding emissions plots to FCC and
CISPR 22 for model LSN-5/10-D12 appear below. The published EMC test
report is based on results with the highest possible output power model and
is therefore representative of the whole LSN-D12 series. Contact DATEL’s
Applications Engineering Department for more details.
EMI CONDUCTED/RADIATED EMISSIONS
100
90
80
70
60
50
40
30
20
10
0
Frequency (MHz)
0.1 1.0 10.0
LSN-5/10-D12 Conducted Emissions
FCC Part 15 Class B, EN55022 Class B Limit, +12 Vdc @ 4.5A
Converter Output = +5Vdc @ 10 Amps
Conducted Emissions (dBµV/M)
Conducted Emissions
FCC Class B Limit
EN55022 Class B Limit
Typical Performance Curves for LSN D12 SIP Series
LSN-10A D12 Models
Single Output, Non-Isolated, 12VIN, 1-5VOUT, 10A, DC/DC's in SIP Packages
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000www.murata-ps.com
MDC_LSN10A-D12.B01 Page 11 of 12
Functional Options
Remote Sense Pin Removed ("B" suffix)
These devices have their +Sense pin (pin 3) removed, and the feedback
loop is closed through the +VOUT path. The 10.5Ω resistor in Figure 1 is
installed in both standard and "B" models. See the Output Sense Function.
Horizontal Mounting ("H" suffix)
This packaging configuration reduces above-board height to 0.35" (8.89mm),
including the isolating pad. For "H" models, a thermally conductive, electri-
cally insulating "pad" is factory installed on the output inductor. The pad
material is Bergquist Sil Pad 400. The pad size is 0.4 x 0.5 x 0.009 inches
(10.16 x 12.7 x 0.23mm). This configuration can significantly improve thermal
performance. See Thermal Derating for details.
Reversed pin vertical mounting ("J" suffix)
This additional mechanical configuration consists of a low-profile pin header
attached to the reverse side of the converter. It allows the LSN series to be
mechanically compatible with competitors' "keep out area."
Other Options and Modifications
Other options include a positive polarity (pull low to disable) on the On/Off
Control. Contact DATEL directly to discuss these and other possible modifi-
cations.
Examples
LSN-1.8/10-D12 Vertical-mount. Sense function on pin 3. No pin 9.
LSN-1.8/10-D12B Vertical-mount. Pin 3 (+Sense) removed. No pin 9.
LSN-1.8/10-D12H Horizontal-mount. Sense function on pin 3. No pin 9.
LSN-1.8/10-D12BH Horizontal-mount. Pin 3 (+Sense) removed. No pin 9.
LSN-1.8/10-D12J Reverse pin vertical-mount. Sense function on pin 3.
No pin 9.
RoHS compliance ("-C" suffix)
Selected models use materials which are compatible with the Reduction of
Hazardous Substances (RoHS) directive.
Contact Murata Power Solutions Technologies (DATEL) for availability.
PART NUMBER STRUCTURE
Maximum Rated Output
Current in Amps
Non-Isolated SIP
Output
Configuration:
L = Unipolar
Low Voltage
Nominal Output Voltage:
1, 1.1, 1.2, 1.3, 1.5, 1.8, 2, 2.5, 3.3 or
5 Volts
Input Voltage Range:
D12 = 10.8 to 13.2 Volts (12V nominal)
L SN 10-/D12 B-1.8
B Suffix:
No Remote Sense
(Pin 3 removed)
H
H Suffix:
Horizontal Mount
J
J Suffix:
Reversed Pin
Vertical Mount
-
RoHS
compliant
C
Note: Not all model number
combinations are available.
Contact Murata Power Solutions
Technologies (DATEL).
04/08/08
LSN-10A D12 Models
Single Output, Non-Isolated, 12VIN, 1-5VOUT, 10A, DC/DC's in SIP Packages
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. © 2008 Murata Power Solutions, Inc.
USA: Mansfield (MA), Tel: (508) 339-3000, email: sales@murata-ps.com
Canada: Toronto, Tel: (866) 740-1232, email: toronto@murata-ps.com
UK: Milton Keynes, Tel: +44 (0)1908 615232, email: mk@murata-ps.com
France: Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: france@murata-ps.com
Germany: München, Tel: +49 (0)89-544334-0, email: munich@murata-ps.com
Japan: Tokyo, Tel: 3-3779-1031, email: sales_tokyo@murata-ps.com
Osaka, Tel: 6-6354-2025, email: sales_osaka@murata-ps.com
Website: www.murata-ps.jp
China: Shanghai, Tel: +86 215 027 3678, email: shanghai@murata-ps.com
Guangzhou, Tel: +86 208 221 8066, email: guangzhou@murata-ps.com
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
www.murata-ps.com email: sales@murata-ps.com ISO 9001 REGISTERED
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000www.murata-ps.com
MDC_LSN10A-D12.B01 Page 12 of 12