LSN2 Series
Non-isolated, DOSA-SIP, 6/10/16A Selectable-Output DC/DC Converters
ORDERING GUIDE SUMMARY
Model
LSN2-T/6-W3
LSN2-T/6-D12
LSN2-T/10-W3
LSN2-T/10-D12
LSN2-T/16-W3
LSN2-T/16-D12
V
OUT
Range
0.75-3.3V
0.75-5V
0.75-3.3V
0.75-5V
0.75-3.3V
0.75-5V
I
OUT
Range
0-6A
0-6A
0-10A
0-10A
0-16A
0-16A
V
IN
Range
2.4-5.5V
8.3-14V
2.4-5.5V
8.3-14V
2.4-5.5V
8.3-14V
Ripple/Noise
15mVp-p
15mVp-p
15mVp-p
30mVp-p
25mVp-p
30mVp-p
Efficiency
94%
93%
95%
95%
95%
94%
Typical Unit
INPUT CHARACTERISTICS
Parameter
Voltage Range
Current, full power
Undervoltage Shutdown
Short Circuit Current
Remote On/Off Control
OUTPUT CHARACTERISTICS
Parameter
Voltage
Current
Power Dissipation
Accuracy
Ripple & Noise
Line and Load Regulation
Overcurrent Protection
Overtemperature Protection
Efficiency
(minimum)
Efficiency
(typical)
GENERAL SPECIFICATIONS
Parameter
Transient Response
Operating Temperature Range
Safety
EMI
MECHANICAL CHARACTERISTICS
6 Amp output models
10 & 16 Amp models
Typ. @ 25°C, full load
2.4-5.5 or 8.3-14V
4.22 to 11.12A
Included
60mA
Positive or negative polarity
Notes
5V or 12V nominal models
Model dependent
With autorestart hysteresis
Output is short circuited
Default polarity is positive
FEATURES
■
User-selectable outputs: 0.75-5V
(D12 models) or 0.75-3.3V (W3 models)
6, 10 or 16A maximum output current
Double lead free to RoHS standards
Selectable phased start-up sequencing
and tracking
Wide range V
IN
8.3-14V or 2.4-5.5V
Up to 52 Watts total output power
Very high efficiency up to 95%
Starts up into pre-biased load
Fast settling, high di/dt I
OUT
slew rate
■
■
■
Typ. @ 25°C, full load
0.75-3.3 or 0.75-5V
0-6, 0-10 or 0-16A
20, 33, 52W max.
±2% of V
NOM
15-75mVpp
±0.03%
Hiccup autorecovery
+115°C shutdown
92-93%
94-95%
Notes
User adjustable, model dependent
Three ranges, model dependent
Three values, model dependent
50% load
Model dependent
Continuous short circuit protection
Model dependent
Model dependent
■
■
■
■
■
DESCRIPTION
These miniature point-of-load (POL) switching
DC/DC converters are ideal regulation and supply
elements for distributed power and intermedi-
ate bus architectures. Fully compatible with
the Distributed-power Open Standards Alliance
specification (www.dosapower.com), LSN2’s can
power CPU’s, programmable logic and mixed-
voltage systems with little heat and low noise. A
typical application uses a master isolated 12 or
5Vdc supply and individual LSN2 converters for
local 1.8 and 3.3Vdc supplies. All system isolation
resides in the central supply, leaving lower cost
POL regulation at the load. The LSN2’s can deliver
very high power (to 52 Watts) in a tiny area with-
out heat sinking or external components. They
feature quick transient response (to 25µsec) and
very fast current slew rates (to 20A/µsec).
Typ. @ 25°C, full load
25μsec
–40 to +85°C
UL/IEC/EN 60950
FCC pt.15, class B
Notes
50% load step to 2% of final value
With 200 lfm airflow
And CSA C22.2-No.234
0.50 x 1.00 x 0.275 inches (12.7 x 25.4 x 6.98 mm)
0.50 x 2.00 x 0.32 inches (12.7 x 50.8 x 8.13 mm)
Pb
Lead-free
construction/attach
For full details go to
www.murata-ps.com/rohs
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MDC_LSN2_A03
Page 1 of 14
LSN2 Series
Non-isolated, DOSA-SIP, 6/10/16A Selectable-Output DC/DC Converters
PERFORMANCE SPECIFICATIONS AND ORDERING GUIDE
➀
Output
Root Model
➆
LSN2-T/6-W3
LSN2-T/6-D12
LSN2-T/10-W3
LSN2-T/10-D12
LSN2-T/16-W3
LSN2-T/16-D12
➅
Input
Regulation
➂
Line
±0.075%
±0.3%
±0.3%
±0.3%
±0.3%
±0.3%
V
OUT
(Volts)
0.75-3.3
0.75-5
0.75-3.3
0.75-5
0.75-3.3
0.75-5
I
OUT
(Amps)
6
6
10
10
16
16
Power
(Watts)
19.8
30
33.0
50
52.8
80
R/N (mVp-p)
➁
Typ.
25
15
15
30
25
30
Max.
40
25
25
75
50
75
Load
±0.055%
±0.3%
±0.3%
±0.3%
±0.3%
±0.3%
V
IN
Nom.
(Volts)
5
12
5
12
5
12
Range
➄
(Volts)
2.4-5.5
8.3-14
2.4-5.5
8.3-14
2.4-5.5
8.3-14
I
IN
➃
(mA/A)
50/4.2
70/2.69
50/6.95
100/4.39
50/11.12
100/7.1
Efficiency
Min.
93.1%
90%
93%
93%
93%
92%
Typ.
94.3%
93%
95%
95%
95%
94%
Package
(Case/
Pinout)
B12, P69
B12, P69
B11, P68
B11, P68
B11, P68
B11, P68
➀
Typical at T
A
= +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.
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.
“Nominal” output is 3.3V (W3 models) or 5V (D12 models)
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.
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
V
IN
must be
≥0.5V
greater than V
OUT
.
➅
LSN2-TXX-D12 efficiencies are shown at 5V
OUT
.
➆
These are not complete model numbers. Please refer to the Part Number Structure when
ordering.
PART NUMBER STRUCTURE
L SN2
-
T
/
16
-
D12 N G
-
C
Output Configuration:
L
= Unipolar
Low Voltage
Non-Isolated SMT
Nominal Output Voltage:
0.75-3.3 Volts (W3)
0.75-5 Volts (D12)
Maximum Rated Output
Current in Amps
RoHS-6 compliant*
Power Good Output:
Blank
= Omitted
G
= Installed
On/Off Polarity:
Blank
= Positive polarity
N
= Negative polarity
Input Voltage Range:
D12
= 8.3-14 Volts (12V nominal)
W3
= 2.4-5.5 Volts (5V nominal)
Note:
Not all model number combinations are
available. Contact MPS.
*Contact MPS for availability.
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MDC_LSN2_A03
Page 2 of 14
LSN2 Series
Non-isolated, DOSA-SIP, 6/10/16A Selectable-Output DC/DC Converters
Performance/Functional Specifications
(1)
INPUT
Input Voltage Range
Isolation
Start-Up Threshold
W3 Models
12V Models
Undervoltage Shutdown
W3 Models
12V Models
Overvoltage Shutdown
Reflected (Back) Ripple Current
(2)
Internal Input Filter Type
Reverse Polarity Protection
Input Current:
Full Load Conditions
Inrush Transient
Shutdown Mode (Off, UV, OT)
Output Short Circuit
No Load
W3 models
12V models
Low Line (V
IN
= V
MIN
)
LSN2-T/6-W3
LSN2-T/6-D12
LSN2-T/10-W3
LSN2-T/10-D12
LSN2-T/16-W3
LSN2-T/16-D12
Remote On/Off Control:
(5)
Positive Logic (no model suffix)
Negative Logic (“N” model suffix)
Current
See Ordering Guide
Not isolated, input and output commons
are internally connected
2.2 Volts
8 Volts
2.0 Volts
7.5 Volts
None
10-70mAp-p (model dependent)
Capacitive
See fuse information
See Ordering Guide
0.1A
2
sec
5mA
60mA
50mA
100mA
5.54 Amps
3.85 Amps
9.14 Amps
6.31 Amps
14.63 Amps
10.2 Amps
OFF = ground pin to +0.8V max.
ON = open pin or +2.5V min. to +V
IN
max.
ON = open pin to +0.3V max.
OFF = +2.5V min. to +V
IN
max.
1mA max.
See Ordering Guide
No minimum load
±2% of V
NOM
See Ordering Guide
±0.02% of V
OUT
range per °C
See Ordering Guide and
(8)
See Ordering Guide and
(10)
See Ordering Guide
Prebias Startup
(16)
Sequencing
Slew Rate
Startup delay until sequence start
Tracking accuracy, rising input
Tracking accuracy, falling input
Sequence pin input impedance
Remote Sense to V
OUT
Power Good Output
(14)
(“G” suffix)
Power_Good Configuration
Short Circuit Duration
Continuous, no damage (output shorted
to ground)
Converter will start up if the external
output voltage is less than V
NOM
2V max. per millisecond
10 milliseconds
V
OUT
= ±100mV of Sequence In
V
OUT
= ±200mV of Sequence In
400kW to 1MW
0.5V max.
(7)
TRUE (OK) = open drain
FALSE (not OK) = Signal Ground to 0.4V
MOSFET to ground with external user
pullup, 10mA max. sink
DYNAMIC CHARACTERISTICS
Dynamic Load Response
25µsec to ±2% of final value
(50-100-50% load step, di/dt = 20A/msec)
Start-Up Time
4-7msec for V
OUT
= nominal
(V
IN
on to V
OUT
regulated or On/Off to V
OUT
)
Switching Frequency
LSN2-T/6 models
LSN2-T/10 and -T/16 models
315kHz
230kHz
TBC Hours
ENVIRONMENTAL
Calculated MTBF
(4)
Operating Temperature Range
(Ambient)
No derating, natural convection
–40 to +63°C, vertical mount, 2.5V
OUT
(9)
With derating
See Derating Curves
Operating PC Board Temperature
Storage Temperature Range
Thermal Protection/Shutdown
Relative Humidity
–40 to +100°C max.
(12)
–55 to +125°C
+115°C
To +85% / +85°C
See Mechanical Specifications
Nylon 46
Tin-plated copper alloy
0.28 ounces (7.8 grams)
FCC part 15, class B, EN55022 (may
need external filter)
UL/cUL 60950-1 CSA-C22.2 No.234
IEC/EN 60950-1
UL94V-0
PHYSICAL
Outline Dimensions
Removable Heat Shield
Pin Material
Weight
Electromagnetic Interference
(conducted and radiated)
Safety
Flammability Rating
OUTPUT
Voltage Output Range
Minimum Loading
Accuracy
(50% load)
Voltage Adjustment Range
(13)
Temperature Coefficient
Ripple/Noise
(20 MHz bandwidth)
Line/Load Regulation
(See Tech Notes)
Efficiency
Maximum Capacitive Loading:
(15)
LSN2-T/6 models:
Cap-ESR = 0.001 to 0.01W
Cap-ESR >0.01W
LSN2-T/10 and -T/16 models:
Cap-ESR = 0.001 to 0.01W
Cap-ESR >0.01W
Current Limit Inception:
(98% of V
OUT
)
LSN2-T/6 models
LSN2-T/10 models
LSN2-T/16 models
Short Circuit Mode
(6)
Short Circuit Current Output
Protection Method
(17)
ABSOLUTE MAXIMUM RATINGS
Input Voltage
(Continuous or transient)
W3 models
12V models
On/Off Control
Input Reverse Polarity Protection
Output Current
(7)
+7 Volts
+15 Volts
–0.3V min. to +V
IN
max.
See Fuse section
Current-limited. Devices can
withstand sustained short circuit
without damage.
Storage Temperature
–55 to +125°C
Lead Temperature
(soldering 10 sec. max.) +280°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 Perfor-
mance/Functional Specifications Table is not implied.
3000µF
5000µF
5000µF
10,000µF
11-13 Amps (cold startup)
11 Amps (after warm up)
18.75 Amps (cold startup)
16.75 Amps (after warm up)
24 Amps (cold startup)
21 Amps (after warm up)
600mA
Hiccup autorecovery on overload removal
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MDC_LSN2_A03
Page 3 of 14
LSN2 Series
Non-isolated, DOSA-SIP, 6/10/16A Selectable-Output DC/DC Converters
Performance/Functional Specification Notes:
(1)
(2)
(3)
(4)
(5)
(6)
(7)
All models are tested and specified with external 1 || 10µF ceramic/tantalum output capacitors
and a 22µF external input capacitor. All capacitors are low ESR types. These capacitors are
necessary to 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.
General conditions for Specifications are +25°C, V
IN
= nominal, V
OUT
= nominal, full load. “Nomi-
nal” output voltage is +5V for D12 models and +3.3V for W3 models.
Input Back Ripple Current is tested and specified over a 5-20MHz bandwidth. Input filtering is
C
IN
= 2 x 100µF tantalum, C
BUS
= 1000µF electrolytic, L
BUS
= 1µH.
Note that Maximum Power Derating curves indicate an average current at nominal input voltage.
At higher temperatures and/or lower airflow, the DC/DC converter will tolerate brief full current
outputs if the total RMS current over time does not exceed the derating curve.
Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method 1, Case 3,
ground fixed conditions, T
PCBOARD
= +25°C, full output load, natural air convection.
The On/Off Control may be driven with external logic or by applying appropriate external voltages
which are referenced to –Input Common. The On/Off Control Input should use either an open
collector/open drain transistor or logic gate which does not exceed +V
IN
. A 68KW external pullup
resistor to +V
IN
will cause the “ON” state for negative logic models.
Short circuit shutdown begins when the output voltage under increasing load degrades approxi-
mately 2% from the selected setting.
If Sense is connected remotely at the load, up to 0.5 Volts difference is allowed between the
Sense and +V
OUT
pins to compensate for ohmic voltage drop in the power lines. A larger voltage
drop may cause the converter to exceed maximum power dissipation.
Output noise may be further reduced by adding an external filter. See I/O Filtering and Noise
Reduction.
(9)
All models are fully operational and meet published specifications, including “cold start” at
–40°C. V
OUT
is nominal.
(10)
Regulation specifications describe the deviation as the line input voltage or output load current is
varied from a nominal midpoint value to either extreme.
(11)
Other input or output voltage ranges are available under scheduled quantity special order.
(12)
Maximum PC board temperature is measured with the sensor in the center.
(13)
Do not exceed maximum power specifications when adjusting the output trim.
(14)
When Sequencing is not used, the Power Good output is TRUE at any time the output is within
approximately ±10% of the voltage set point. Power Good basically indicates if the converter is
in regulation. Power Good detects Over Temperature if the PWM has shut down due to OT. Power
Good does not directly detect Over Current.
If Sequencing is in progress, Power Good will falsely indicate TRUE (valid) before the output
reaches its setpoint. Ignore Power Good if Sequencing is in transition.
(15)
The maximum output capacitive loads depend on the the Equivalent Series Resistance (ESR) of
the external output capacitor.
(16)
Do not use Pre-bias startup and sequencing together. See Technical Notes below.
(17)
After short circuit shutdown, if the load is partially removed such that the load still exceeds the
overcurrent (OC) detection, the converter will remain in hiccup restart mode.
(18)
For best noise performance, leave the Track/Sequence pin OPEN when not used.
(8)
Figure 1. LSN2 Series Simplified Schematic
Typical topology is shown
TECHNICAL NOTES
I/O Filtering and Noise Reduction
All models in the LSN2 Series are tested and specified with external
1 || 10µF ceramic/tantalum output capacitors and a 22µF tantalum input
capacitor. These capacitors are necessary to accommodate our test equip-
ment and may not be required to achieve desired performance in your appli-
cation. The LSN2'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 LSN2'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.
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.
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MDC_LSN2_A03
Page 4 of 14
LSN2 Series
Non-isolated, DOSA-SIP, 6/10/16A Selectable-Output DC/DC Converters
calculated at low line with the converter's minimum efficiency should be
installed within the ungrounded input path to the converter.
Safety Considerations
LSN2 SIPs 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.
Figure 2. Measuring Input Ripple Current
Input Overvoltage and Reverse-Polarity Protection
LSN2 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 V
IN
to V
OUT
Start-Up Time is the interval between the time at which a
ramping input voltage crosses the lower limit of the specified input volt-
age range 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 V
OUT
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
LSN2 Series offer an output sense function. 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 usu-
ally 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 should be used.
To prevent high frequency voltage differences between V
OUT
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 V
OUT
.
[V
OUT
(+) – Common] – [Sense(+) – Common]
≤
10%V
OUT
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 LSN2's specified rating. Therefore:
(V
OUT
at pins) x (I
OUT
)
≤
rated output power
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 fre-
quency 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.
Figure 3. Measuring Output Ripple/Noise (PARD)
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 Engineer-
ing Group for additional details.
Input Fusing
Most applications and or safety agencies require the installation of fuses at
the inputs of power conversion components. The LSN2 Series are not inter-
nally fused. Therefore, if input fusing is mandatory, either a normal-blow or a
slow-blow fuse with a value no greater than twice the maximum input current
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