Single Output LSN-10A Models
Non-Isolated, 5VIN, 1-3.8VOUT
10 Amp DC/DC In SIP Package
FEATURES
Industry-standard SIP pinout
Shorter (2.0" vs. 2.5") package length
4.5-5.5V input range
Typical units
1/1.2/1.5/1.8/2/2.5/3.3/3.8VOUT @ 10A
Non-isolated, fully synchronous,
300kHz, buck topology
Outstanding performance:
v ±1% setpoint accuracy
v Efficiencies to 95% @ 10 Amps
v Noise as low as 10mVp-p
v Stable no-load operation
v Trimmable output voltage
Remote on/off and sense pins
PRODUCT OVERVIEW
Thermal shutdown
No derating to +71°C, natural convection
UL/IEC/EN60950-1 certified
EMC compliant
Murata Power Solutions' new LSN D5 Series SIP’s
(single-in-line packages) are non-isolated DC/DC
converters that accept a 5V input (4.5V to 5.5V
input range) and deliver 1V, 1.2V, 1.5V, 1.8V, 2V,
2.5, 3.3 or 3.8V outputs at 10 Amps. LSN D5 SIP’s
take on-board 5V power and convert it, with the
highest efficiency in the smallest space, to any
lower voltage required by today’s current-hungry
DSP’s, ASIC’s and CPLD’s.
The miniature size of LSN D5's makes them
ideal for true point-of-use power processing. Vertical-mount packages occupy a mere 0.7 square
inches (440 sq. mm), and they are available in
industry-standard and Tyco-compatible pinout.
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
(300kHz), buck topology that also delivers: high
efficiency (to 95%), low noise (10mVp-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 D5's to deliver rated output currents of
10 Amps at ambient temperatures to +71°C with
no air flow (natural convection).
If your low-voltage, high-current requirements
make the use of inefficient linear regulators
impractical, take a look at one of C&D’s easy-touse, low-cost LSN SIP’s. All devices are UL/IEC/
EN60950-1 certified and EMC compliant. UL, CB,
HALT and EMC reports are available upon request.
Selected models are RoHS compliant.
For full details go to
www.murata-ps.com/rohs
+OUTPUT
(1,2,4)
+INPUT
(7,8)
10.57
220μF
44μF
47.1μF
(100.1μF)
470μF
(330μF)
+SENSE ~
(3)
COMMON
(5)
COMMON
(6)
CURRENT
SENSE
VCC
ON/OFF
CONTROL
(11)
PWM
CONTROLLER
REFERENCE &
ERROR AMP
~For devices with the sense-pin removed ("B" suffix), the feedback
path is through the +Output pin and not the +Sense pin.
Values in parenthesis for 3.3V models only.
Typical topology is shown.
TRIM
(10)
Figure 1. Simplified Schematic
www.murata-ps.com
Technical enquiries email: [email protected], tel: +1 508 339 3000
MDC_LSN-10A D5 Models.B01 Page 1 of 15
Single Output LSN-10A Models
Non-Isolated, 5VIN, 1-3.8VOUT
10 Amp DC/DC In SIP Package
Performance Specifications and Ordering Guide ~
Input
Output
Model
LSN-1/10-D5
VOUT
(Volts)
IOUT
(Amps)
R/N (mVp-p)
Typ.
Max.
Regulation (Max.)
Line
Load
VIN Nom.
(Volts)
Range
(Volts)
IIN
(mA/A)
Efficiency
Full Load
½ Load
Min.
Typ.
Typ.
Package
(Case,
Pinout)
1
10
10
35
±0.1%
±0.25%
5
4.5-5.5
50/2.43
83%
86%
89%
B7/B7x, P59
LSN-1.2/10-D5
1.2
10
10
35
±0.1%
±0.25%
5
4.5-5.5
50/2.85
85%
88%
91%
B7/B7x, P59
LSN-1.5/10-D5
1.5
10
10
35
±0.1%
±0.25%
5
4.5-5.5
50/3.48
87%
90%
92%
B7/B7x, P59
LSN-1.8/10-D5
1.8
10
10
35
±0.1%
±0.25%
5
4.5-5.5
50/4.09
89%
91.5%
93.5%
B7/B7x, P59
LSN-2/10-D5
2
10
10
35
±0.1%
±0.25%
5
4.5-5.5
50/4.51
89.5%
92.5%
94%
B7/B7x, P59
LSN-2.5/10-D5
2.5
10
10
35
±0.1%
±0.25%
5
4.5-5.5
50/5.50
91%
94%
95.5%
B7/B7x, P59
LSN-3.3/10-D5
3.3
10
10
35
±0.1%
±0.25%
5
4.5-5.5
50/7.25
92%
95%
96%
B7/B7x, P59
LSN-3.8/10-D5
3.8
10
10
35
±0.1%
±0.25%
5
4.5-5.5
50/8.0
92%
95%
96%
B7/B7x, P59
~ Typical at TA = +25°C under nominal line voltage and full-load conditions, unless otherwise
noted. All models are tested and specified with external 22μF input and output capacitors.
These 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.
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.
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.
Nominal line voltage, no-load/full-load conditions.
Avaiilable with RoHS (Reduction of Hazardous Substances) compliance.
These are not complete model numbers. Please use the Part Number Structure when
ordering.
PART NUMBER STRUCTURE
L SN - 1.8 / 10 - D5 B H J - C
Output
Configuration:
L = Unipolar
Low Voltage
RoHS-6
compliant*
J Suffix:
Reversed Pin
Vertical Mount
Non-Isolated SIP
H Suffix:
Horizontal Mount
Nominal Output Voltage:
1, 1.2, 1.5, 1.8, 2, 2.5, 3.3, or 3.8V
Maximum Rated Output
Current in Amps
See page 15 for details.
Note: Not all model number
combinations are available.
Contact MPS.
B Suffix:
No Remote Sense
(Pin 3 removed)
Input Voltage Range:
D5 = 4.5 to 5.5 Volts
(5V nominal)
* Contact Murata Power
Solutions for availability.
www.murata-ps.com
Technical enquiries email: [email protected], tel: +1 508 339 3000
MDC_LSN-10A D5 Models.B01 Page 2 of 15
Single Output LSN-10A Models
Non-Isolated, 5VIN, 1-3.8VOUT
10 Amp DC/DC In SIP Package
MECHANICAL SPECIFICATIONS
0.35
(8.89)
2.00
(50.80)
6 7 8 9 10 11
1 2 3 4 5
0.50
(12.7)
0.030 ±0.001 DIA.
(0.762 ±0.025)
0.400
(10.16)
4 EQ. SP. @
0.100 (2.54)
0.56
(14.22)
2.00
(50.80)
0.21
(5.33)
0.05
(1.27)
1.000
(25.40)
0.17
(4.32)
ISOLATING
PAD
0.030 ±0.001 DIA.
(0.762 ±0.025)
0.360
(9.14)
0.400
(10.16)
4 EQ. SP. @
0.100 (2.54)
Case B7A
Horizontal Mounting
0.53
(13.46)
0.25
(6.35)
0.50
(12.7)
0.50
(12.7)
0.05
(1.27)
1.000
(25.40)
0.500
(12.70)
5 EQ. SP. @
0.100 (2.54)
0.110
(2.79)
0.046
(1.17)
0.34
(8.64)
LAYOUT PATTERN
TOP VIEW
0.45
(11.43)
RECOMMENDED
COPPER PAD
ON PCB (0.55 SQ. IN.)
0.20
(5.08)
6 7 8 9 10 11
1 2 3 4 5
0.16
(4.06)
0.05
(1.27)
0.500
(12.70)
5 EQ. SP. @
0.100 (2.54)
0.34
(8.64)
Case B7
Vertical Mounting
(Standard)
LAYOUT PATTERN
TOP VIEW
0.36
(9.14)
2.00
(50.80)
0.20
(5.08)
0.17
(4.32)
0.50
(12.7)
6 7 8 9 10 11
1 2 3 4 5
0.030 ±0.001 DIA.
(0.762 ±0.025)
Dimensions in inches (mm)
0.400
(10.16)
4 EQ. SP. @
0.100 (2.54)
Function P59*
+Output
+Output
+Sense *
+Output
I/O Connections
Pin
Function P59*
5
Common
6
Common
7
+Input
8
+Input
Pin
9
10
11
Function P59*
No Pin
VOUT Trim
On/Off Control
www.murata-ps.com
0.046
(1.17)
0.106
(2.69)
0.500
(12.70)
5 EQ. SP. @
0.100 (2.54)
LAYOUT PATTERN
TOP VIEW
0.306
(7.8)
Pin
1
2
3
4
1.000
(25.40)
0.05
(1.27)
0.36
(9.14)
Case B7B
Reverse Pin
Vertical Mounting
(Tyco-compatible)
Pin 3 (+Sense) removed
for "B" suffix models.
Technical enquiries email: [email protected], tel: +1 508 339 3000
MDC_LSN-10A D5 Models.B01 Page 3 of 15
Single Output LSN-10A Models
Non-Isolated, 5VIN, 1-3.8VOUT
10 Amp DC/DC In SIP Package
Performance/Functional Specifications
Typical @ TA = +25°C under nominal line voltage and full-load conditions unless noted. ~
Input
Input Voltage Range
4.5 to 5.5 Volts (5V nominal)
Input Current:
Normal Operating Conditions
Inrush Transient
Standby/Off Mode
Output Short-Circuit Condition
See Ordering Guide
0.014A2sec
3mA
70mA average
Input Reflected Ripple Current
50mAp-p
Input Filter Type
Capacitive (264μF)
Overvoltage Protection
None
Reverse-Polarity Protection
None
Undervoltage Shutdown
None
On/Off Control
On = open (internal pulldown)
Off = +2.8V to +VIN (<3mA)
Output
VOUT Accuracy (50% load)
±1% maximum
Minimum Loading ~
No load
Maximum Capacitive Load
10,000μF (electrolytic)
VOUT Trim Range
±10%
Ripple/Noise (20MHz BW) ~
See Ordering Guide
Total Accurcacy
3% over line/load/temperature
Efficiency
See Ordering Guide
Overcurrent Detection and Short-Circuit Protection:
Current-Limiting Detection Point
17 (12.5-22) Amps
Short-Circuit Detection Point
98% of VOUT set
SC Protection Technique
Hiccup with auto recovery
Short-Circuit Current
400mA average
~ 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.
See Technical Notes and Performance Curves for details.
The On/Off Control (pin 11) is designed to be driven with open-collector logic or the application of
appropriate voltages (referenced to Common, pins 5 and 6).
Output noise may be further reduced with the installation of additional external output filtering. See
I/O Filtering and Noise Reduction.
Absolute Maximum Ratings
Input Voltage:
Continuous or transient
7 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.
Dynamic Characteristics
Transient Response (50% load step)
50μsec to ±2% of final value
Start-Up Time:
VIN to VOUT
On/Off to VOUT
7msec
6msec
Switching Frequency
300kHz (+40kHz, –50kHz)
Environmental
MTBF: Bellcore, ground fixed, TA = +25°C,
full power, natural convection,
+55°C component temperature
2.1 million hours
Operating Temperature: (Ambient)
Without Derating (Natural convection)
With Derating
–40 to +63/71°C (model dependent)
See Derating Curves
Thermal Shutdown
+115°C
Physical
Dimensions
See Mechanical Specifications
Package
Open-frame, single-in-line (SIP)
Pin Dimensions/Material
0.03" (0.76mm) round copper with
gold plate over nickel underplate
Weight
0.3 ounces (8.5g)
Flamability Rating
UL94V-0
Safety
UL/cUL/IEC/EN 60950-1, CSA-C22.2 No. 234
www.murata-ps.com
Technical enquiries email: [email protected], tel: +1 508 339 3000
MDC_LSN-10A D5 Models.B01 Page 4 of 15
Single Output LSN-10A Models
Non-Isolated, 5VIN, 1-3.8VOUT
10 Amp DC/DC In SIP Package
TECHNICAL NOTES
Return Current Paths
The LSN D5 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 D5 Series are tested and specified with external 22μF
input and output capacitors. These capacitors are necessary to accommodate our test equipment and may not be required to achieved desired performance in your application. The LSN D5'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 D5'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
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
additional external output capacitors. Output capacitors function as true
filter elements and should be selected for bulk capacitance, low ESR, and
appropriate 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 solutions and discuss the possibility of our modifying a given
device’s internal filtering to meet your specific requirements. Contact our
Applications Engineering Group for additional details.
www.murata-ps.com
Input Fusing
Most applications and or safety agencies require the installation of fuses at the
inputs of power conversion components. LSN D5 Series DC/DC converters are
not internally fused. Therefore, if input fusing is mandatory, either a normalblow or a slow-blow fuse with a value no greater than 15 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 D5 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 specifications (usually
UL/IEC/EN60950-1).
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 D5 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 "instantaneous"
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
(4.5 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.
Remote Sense
LSN D5 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 techniques
Technical enquiries email: [email protected], tel: +1 508 339 3000
MDC_LSN-10A D5 Models.B01 Page 5 of 15
Single Output LSN-10A Models
Non-Isolated, 5VIN, 1-3.8VOUT
10 Amp DC/DC In SIP Package
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] b 10%VOUT
Power derating (output current limiting) is based upon maximum output current and voltage at the converter's output pins. Use of trim and sense functions
can cause the output voltage to increase, thereby increasing output power
beyond the LSN's specified rating. Therefore:
(VOUT at pins) x (IOUT) b rated output power
The internal 10.57resistor 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.
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.
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-D5'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.
Output Overvoltage Protection
LSN D5 SIP 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 (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.
On/Off Control and Power-up Sequencing
The On/Off Control pin may be used for remote on/off operation. LSN D5 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.
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 D5
SIP Series DC/DC converters incorporate an output overcurrent detection and
shutdown function that serves to protect both the power converter and its load.
+INPUT
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 D5'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 70mA. Once the
output short is removed, the converter will automatically restart itself.
5k7
1.1k7
ON/OFF
CONTROL
0.75k7
COMMON
Figure 2. Driving the On/Off Control Pin with an Open-Collector Drive Circuit
+INPUT
Output Voltage Trimming
Allowable trim ranges for each model in the LSN D5 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.
5k7
2k7
+OUTPUT
1.1k7
+INPUT
ON/OFF
CONTROL
TRIM
0.75k7
20k7
5-10
Turns
LOAD
COMMON
COMMON
COMMON
Figure 2a. Inverting On/Off Control Pin Signal and Power-Up Sequencing
www.murata-ps.com
Figure 3. Trim Connections Using a Trimpot
Technical enquiries email: [email protected], tel: +1 508 339 3000
MDC_LSN-10A D5 Models.B01 Page 6 of 15
Single Output LSN-10A Models
Non-Isolated, 5VIN, 1-3.8VOUT
10 Amp DC/DC In SIP Package
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.
+OUTPUT
Trim
Down
+INPUT
LOAD
TRIM
COMMON
Trim Up
COMMON
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
The equations below can be used as starting points for selecting specific trimresistor values. Recall, untrimmed devices are guaranteed to be p1% accurate.
Adjustment beyond the specified ±10% adjustment range is not recommended.
Model
Trim Equations
RT DOWN (k7) =
LSN-1/10-D5
RT UP (k7) =
RT DOWN (k7) =
LSN-1.2/10-D5
RT UP (k7) =
LSN-1.5/10-D5
LSN-1.8/10-D5
LSN-2/10-D5
LSN-2.5/10-D5
RT DOWN (k7) =
RT UP (k7) =
RT DOWN (k7) =
LSN-3.3/10-D5
RT UP (k7) =
RT DOWN (k7) =
LSN-3.8/10-D5
RT UP (k7) =
1.62(VO – 0.8)
–1
1 – VO
1.296
–1
VO – 1
2.49(VO – 0.8)
1.2 – VO
1.992
VO – 1.2
– 2.37
– 2.37
2.37(VO – 0.8)
VO NOM – VO
1.896
VO – VO NOM
7.5(VO – 0.8)
VO NOM – VO
– 4.99
– 4.99
– 4.99
6
– 4.99
VO – VO NOM
7.5(VO – 0.8)
3.8 – VO
6
VO – 3.8
– 13
– 13
Note: Resistor values are in k7. Accuracy of adjustment is subject to
tolerances of resistors and factory-adjusted, initial output accuracy.
VO = desired output voltage. VONOM = nominal output voltage.
www.murata-ps.com
Output Reverse Conduction
Many DC/DC converters 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 D5 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.
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 D5 SIP's under known ambient-temperature and air-flow
conditions. Similarly, the curves indicate how much air flow is required to reliably deliver a required output current at known temperatures.
The highest temperatures in LSN D5 SIP's occur at their output inductor,
whose heat is generated primarily by I 2 R losses. The above curves were developed using thermocouples to monitor the inductor temperature and 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.
In all cases below, the DUT's were vertical-mount models, and the direction
of air flow was parallel to the unit in the direction from pin 1 to pin 11.
As you may deduce from the above curves and can observe in the efficiency
curves on the next page, LSN D5 SIP's are more efficient at lower current
levels. Also, I 2 R losses in the output inductor are significantly less at lower
currents. Consequently, LSN D5 SIP's deliver very impressive temperature
performance if operating at less than full load.
Lastly, when LSN D5 SIP's are installed in system boards, they are obviously
subject to numerous factors and tolerances not taken into account above.
If you are attempting to extract the most current out of these units under
demanding temperature conditions, we advise you to monitor the outputinductor temperature to ensure it remains below +110°C at all times.
Thermal Performance for "H" Models
Enhanced thermal performance can be achieved when LSN D5 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.
Technical enquiries email: [email protected], tel: +1 508 339 3000
MDC_LSN-10A D5 Models.B01 Page 7 of 15
Single Output LSN-10A Models
Non-Isolated, 5VIN, 1-3.8VOUT
10 Amp DC/DC In SIP Package
Typical Performance Curves for LSN D5 SIP Series
LSN-1/10-D5
Output Current vs. Ambient Temperature
(Vertical mount, air flow direction from pin 1 to pin 11)
LSN-1.2/10-D5
Output Current vs. Ambient Temperature
(Vertical mount, air flow direction from pin 1 to pin 11)
10
8
Output Current (Amps)
Output Current (Amps)
10
Natural Convection
6
100 lfm
4
200 lfm
2
8
Natural Convection
6
100 lfm
4
200 lfm
2
0
–40
0
60
70
80
90
100
0
–40
110
0
60
80
90
100
110
100
110
LSN-1.8/10-D5 & LSN-2/10-D5
Output Current vs. Ambient Temperature
(Vertical mount, air flow direction from pin 1 to pin 11)
LSN-1.5/10-D5
Output Current vs. Ambient Temperature
(Vertical mount, air flow direction from pin 1 to pin 11)
10
10
8
8
Output Current (Amps)
Output Current (Amps)
70
Ambient Temperature (oC)
Ambient Temperature (oC)
Natural Convection
6
100 lfm
4
Natural Convection
6
100 lfm
4
200 lfm
200 lfm
2
0
–40
2
0
60
70
80
90
100
110
Ambient Temperature (oC)
www.murata-ps.com
0
–40
0
60
70
80
90
Ambient Temperature (oC)
Technical enquiries email: [email protected], tel: +1 508 339 3000
MDC_LSN-10A D5 Models.B01 Page 8 of 15
Single Output LSN-10A Models
Non-Isolated, 5VIN, 1-3.8VOUT
10 Amp DC/DC In SIP Package
Typical Performance Curves for LSN D5 SIP Series
LSN-1/10-D5
Efficiency vs. Line Voltage and Load Current
LSN-2.5/10-D5 & LSN-3.3/10-D5
Output Current vs. Ambient Temperature
(Vertical mount, air flow direction from pin 1 to pin 11)
90
10
8
86
Natural Convection
Efficiency (%)
Output Current (Amps)
88
6
100 lfm
4
200 lfm
84
VIN = 4.5V
82
VIN = 5V
80
VIN = 5.5V
2
78
76
0
–40
0
60
70
80
90
100
110
74
Ambient Temperature (oC)
1
2
3
4
5
6
7
8
9
10
8
9
10
Load Current (Amps)
LSN-1.5/10-D5
Efficiency vs. Line Voltage and Load Current
LSN-1.2/10-D5
Efficiency vs. Line Voltage and Load Current
92
93
90
91
88
Efficiency (%)
Efficiency (%)
89
86
VIN = 4.5V
84
VIN = 5V
VIN = 4.5V
87
VIN = 5V
85
82
VIN = 5.5V
VIN = 5.5V
83
80
78
81
1
2
3
4
5
6
7
8
9
10
Load Current (Amps)
www.murata-ps.com
1
2
3
4
5
6
7
Load Current (Amps)
Technical enquiries email: [email protected], tel: +1 508 339 3000
MDC_LSN-10A D5 Models.B01 Page 9 of 15
Single Output LSN-10A Models
Non-Isolated, 5VIN, 1-3.8VOUT
10 Amp DC/DC In SIP Package
Typical Performance Curves for LSN D5 SIP Series
LSN-2/10-D5
Efficiency vs. Line Voltage and Load Current
94
95
93
94
92
93
91
92
Efficiency (%)
Efficiency (%)
LSN-1.8/10-D5
Efficiency vs. Line Voltage and Load Current
90
VIN = 4.5V
89
VIN = 5V
88
87
91
VIN = 4.5V
90
89
VIN = 5V
88
VIN = 5.5V
VIN = 5.5V
86
87
85
86
84
85
1
2
3
4
5
6
7
8
9
10
1
2
3
4
Load Current (Amps)
5
6
7
8
9
10
Load Current (Amps)
LSN-3.3/10-D5
Efficiency vs. Line Voltage and Load Current
LSN-2.5/10-D5
Efficiency vs. Line Voltage and Load Current
96
97
95
96
94
95
92
Efficiency (%)
Efficiency (%)
93
VIN = 4.5V
91
VIN = 5V
94
VIN = 4.5V
93
VIN = 5V
90
92
VIN = 5.5V
89
VIN = 5.5V
91
88
87
90
1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
6
7
8
9
10
Load Current (Amps)
Load Current (Amps)
www.murata-ps.com
Technical enquiries email: [email protected], tel: +1 508 339 3000
MDC_LSN-10A D5 Models.B01 Page 10 of 15
Single Output LSN-10A Models
Non-Isolated, 5VIN, 1-3.8VOUT
10 Amp DC/DC In SIP Package
Typical Performance Curves for LSN D5 SIP Series
Input Inrush Current
(VIN = 5V, 4300μF as Input Switch )
5A/div
10mA/div
Input Reflected Ripple Current
(VIN = 5V, VOUT = 3.3V/10A, Input Filter = 220μF/12μH/33μF, COUT = NA
20μsec/div
2μsec/div
Power-Up From VIN
(VIN = 5V, VOUT = 3.3V/10A, CIN = 220μF, No External COUT)
2V/div
10mA/div
Input Reflected Ripple Current
(VIN = 5V, VOUT = 3.3V/10A, CIN = 220μF, No External COUT )
1μsec/div
2msec/div
www.murata-ps.com
Technical enquiries email: [email protected], tel: +1 508 339 3000
MDC_LSN-10A D5 Models.B01 Page 11 of 15
Single Output LSN-10A Models
Non-Isolated, 5VIN, 1-3.8VOUT
10 Amp DC/DC In SIP Package
Typical Performance Curves for LSN D5 SIP Series
Power-Up From Enable
(VIN = 5V, VOUT = 3.3V/10A, CIN = 220μF, No External COUT)
2V/div
10mV/div
Output Ripple/Noise
(VIN = 5V, VOUT = 3.3V, No Load, No External Capacitor)
2msec/div
1μsec/div
Dynamic Load Response
(VIN = 5V, 100% to 50% Load Step, No External COUT)
20mV/div
10mV/div
Output Ripple/Noise
(VIN = 5V, VOUT = 3.3V, Full Load, COUT = 220μF)
1μsec/div
50μsec/div
www.murata-ps.com
Technical enquiries email: [email protected], tel: +1 508 339 3000
MDC_LSN-10A D5 Models.B01 Page 12 of 15
Single Output LSN-10A Models
Non-Isolated, 5VIN, 1-3.8VOUT
10 Amp DC/DC In SIP Package
Typical Performance Curves for LSN D5 SIP Series
Dynamic Load Response
(VIN = 5V, VOUT = 3.3V, 100% to 0% Load Step, No External COUT)
50mV/div
10mV/div
Output Ripple/Noise
(VIN = 5V, VOUT = 3.3V, Full Load, No External Capacitor)
1μsec/div
50μsec/div
Input Current with Short Circuit at Output
(VIN = 5V, VOUT = Short, IIN = 70mA Average,
IOUT = 400mA Average, CIN = 220μF, COUT = NA, Period = 25msec )
0.5A/div
100mV/div
Output Hiccup
(VIN = 5V, VOUT = Short, IIN = 70mA Average,
IOUT = 400mA Average, CIN = 220μF, No External COUT)
5msec/div
2.5msec/div
www.murata-ps.com
Technical enquiries email: [email protected], tel: +1 508 339 3000
MDC_LSN-10A D5 Models.B01 Page 13 of 15
Single Output LSN-10A Models
Non-Isolated, 5VIN, 1-3.8VOUT
10 Amp DC/DC In SIP Package
Typical Performance Curves for LSN D5 SIP Series
5A/div
Short-Circuit Output Current
(VIN = 5V, VOUT = Short, IIN = 70mA Average,
IOUT = 400mA Average, CIN = 220μF, COUT = NA, Period = 25msec)
500μsec/div
www.murata-ps.com
Technical enquiries email: [email protected], tel: +1 508 339 3000
MDC_LSN-10A D5 Models.B01 Page 14 of 15
Single Output LSN-10A Models
Non-Isolated, 5VIN, 1-3.8VOUT
10 Amp DC/DC In SIP Package
EMI CONDUCTED/RADIATED EMISSIONS
If you’re designing with EMC in mind, please note that all of MPS’s LSN D5 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. For
corresponding emissions plots to FCC and CISPR 22 for model LSN-5/10-D12
(the highest possible output power model) and for LSN-2/10-D3 (representing
the highest input current models) see LSN-10A D12 and LSN-10A D3 data
sheets for reference. These respective curves are representative of all LSN
models. Contact MPS’s Applications Engineering Department for more details.
L SN - 1.8 / 10 - D5 B H J - C
RoHS compliant
J Suffix:
Reversed Pin
Vertical Mount
Non-Isolated SIP
Nominal Output Voltage:
1, 1.2, 1.5, 1.8, 2, 2.5, 3.3, or 3.8V
Maximum Rated Output
Current in Amps
Note: Not all model number
combinations are available.
Contact Murata Power Solutions.
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 10.57 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 "pad." For "H" models, a thermally conductive, electrically
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 Tyco's "keep out area."
PART NUMBER STRUCTURE
Output
Configuration:
L = Unipolar
Low Voltage
Functional Options
Other Options and Modifications
Other options include a positive polarity (pull low to disable) on the On/Off Control. Contact MPS directly to discuss these and other possible modifications.
Examples
LSN-1.8/10-D5
LSN-1.8/10-D5B
LSN-1.8/10-D5H
LSN-1.8/10-D5BH
LSN-1.8/10-D5J
No pin 9.
H Suffix:
Horizontal Mount
B Suffix:
No Remote Sense
(Pin 3 removed)
Input Voltage Range:
D5 = 4.5 to 5.5 Volts (5V nominal)
Vertical-mount. Sense function on pin 3. No pin 9.
Vertical-mount. Pin 3 (+Sense) removed. No pin 9.
Horizontal-mount. Sense function on pin 3. No pin 9.
Horizontal-mount. Pin 3 (+Sense) removed. No pin 9.
Reverse pin vertical-mount. Sense function on pin 3.
RoHS compliance ("-C" suffix)
Selected models use materials which are compatible with the Reduction of
Hazardous Substances (RoHS) directive. Contact Murata Power Solutions.
USA:
Tucson (AZ), Tel: (800) 547 2537, email: [email protected]
Canada:
Toronto, Tel: (866) 740 1232, email: [email protected]
UK:
Milton Keynes, Tel: +44 (0)1908 615232, email: [email protected]
France:
Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: [email protected]
Germany: München, Tel: +49 (0)89-544334-0, email: [email protected]
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
ISO 9001 REGISTERED
email: [email protected]
3/6/08
Japan:
Tokyo, Tel: 3-3779-1031, email: [email protected]
Osaka, Tel: 6-6354-2025, email: [email protected]
Website: www.murata-ps.jp
China:
Shanghai, Tel: +86 215 027 3678, email: [email protected]
Guangzhou, Tel: +86 208 221 8066, email: [email protected]
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.
www.murata-ps.com
Technical enquiries email: [email protected], tel: +1 508 339 3000
MDC_LSN-10A D5 Models.B01 Page 15 of 15