www.murata-ps.com
LSN-16A D12 Models
Single Output, Non-Isolated, 12V
IN
, 0.75-5V
OUT
16 Amp in DC/DCs SIP Packages
Typical Units
FEATURES
Step-down buck regulators for new
distributed 12V power architectures
input (10-14V range)
12V
0.75/1/1.2/1.5/1.8/2.5/3.3/5V
OUT
@16A
Voltage-selectable "T" version
Non-isolated, fixed-frequency,
synchronous-rectifier topology
Outstanding performance:
•
±1.25% setpoint accuracy
•
Efficiencies to 96% @ 16 Amps
•
Noise as low as 30mVp-p
•
Stable no-load operation
•
Trimmable output voltage
Remote on/off control and sense
Thermal shutdown
derating to +68°C with 200 lfm
No
UL/IEC/EN60950-1 certified
compliant
EMC
+INPUT
(7,8)
PRODUCT OVERVIEW
LSN Series D12 SIP's (single-in-line pack-
ages) 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 (10V to 14V input range) and convert
it, with the highest efficiency in the smallest
space, to a 0.75, 1, 1.2, 1.5, 1.8, 2.5, 3.3 or
5 Volt output fully rated at 16 Amps.
LSN D12's are ideal point-of-use/load
power processors. They typically require no
external components. Their vertical-mount
packages occupy a mere 0.72 square inches
(4.6 sq. cm), and reversed pin vertical mount
allows mounting to meet competitor’s keep
out area. Horizontal-mount packages (“H”
suffix) are only 0.37 inches (9.4mm) high.
The LSN's best-in-class power density is
achieved with a fully synchronous, fixed-fre-
quency, buck topology that also delivers: high
efficiency (96% for 5VOUT models), low noise
(30 to 55mVp-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 D12s to deliver
rated output currents of 16 Amps at ambient
temperatures to +68°C with 200 lfm air flow.
If your new system boards call for three or
more supply voltages, check out the econom-
ics of on-board 12V distributed power. If you
don’t need to pay for multiple isolation barri-
ers, DATEL's non-isolated LSN D12 SIP's will
save you money.
+OUTPUT
(1,2,4)
10.5Ω
66µF
100µF
330µF
+SENSE
(3)
COMMON
(5)
COMMON
(6)
CURRENT
SENSE
V
CC
ON/OFF
CONTROL
(11)
PWM
CONTROLLER
REFERENCE &
ERROR AMP
V
OUT
TRIM
(10)
Typical topology is shown
Figure 1. Simplified Schematic
For full details go to
www.murata-ps.com/rohs
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MDC_LSN 16A D12 Models.C01
Page 1 of 13
LSN-16A D12 Models
Single Output, Non-Isolated, 12V
IN
, 0.75-5V
OUT
16 Amp in DC/DCs SIP Packages
Performance Specifications and Ordering Guide
➀
ORDERING GUIDE
Output
Root Model
➆
LSN-0.75/16-D12
➄
LSN-1/16-D12
LSN-1.2/16-D12
LSN-1.5/16-D12
LSN-1.8/16-D12
LSN-2/16-D12
LSN-2.5/16-D12
LSN-3.3/16-D12
LSN-5/16-D12
LSN-T/16-D12
➅
V
OUT
(Volts)
0.75
1
1.2
1.5
1.8
2
2.5
3.3
5
0.75-5
Input
Regulation (Max.)
Line
±0.1%
±0.1%
±0.1%
±0.1%
±0.1%
±0.1%
±0.1%
±0.1%
±0.1%
±0.1%
Efficiency
I
IN
➃
(mA/A)
39/1.21
39/1.45
45/1.70
54/2.09
53/2.49
59/2.93
60/3.38
69/4.37
75/6.52
80/7.0
I
OUT
(Amps)
16
16
16
16
16
16
16
16
16
16
Max.
Power
(Watts)
12
16
19.2
24
28.8
32
40
52.8
80
80
R/N (mVp-p)
Typ.
45
45
45
30
30
30
35
40
50
55
Max.
65
65
60
45
45
45
50
55
75
75
Load
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
V
IN
Nom.
(Volts)
12
12
12
12
12
12
12
12
12
12
Range
(Volts)
10-14
10-14
10-14
10-14
10-14
10-14
10-14
10-14
10-14
10-14
Full Load
Min.
80%
83%
85%
86%
87%
88%
90.5%
92.5%
94%
95%
½
Load
Typ.
86%
86%
90%
91%
92%
NA
94%
96%
95.5%
96.5%
Typ.
82.5%
86%
89.5%
88%
90.5%
91%
92.5%
94.5%
96%
95.5%
Package
(Case,
Pinout)
B8/B8x, P59
B8/B8x, P59
B8/B8x, P59
B8/B8x, P59
B8/B8x, P59
B8/B8x, P59
B8/B8x, P59
B8/B8x, P59
B8/B8x, P59
B8/B8x, P59
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.
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
Contact MPS for availablilty.
➅
LSN-T16-D12 efficiencies are shown at 5V out.
➆
These are incomplete model numbers. Please refer to the Part Number Structure when ordering.
PART NUMBER STRUCTURE
L SN
-
1.8
/
16
-
D12 H J
-
C
Output
Configuration:
L
= Unipolar
Low Voltage
Non-Isolated SIP
Nominal Output Voltage:
0.75, 1, 1.2, 1.5, 1.8, 2.5, 3.3
or 5 Volts or "T" selectable voltage
Maximum Rated Output
Current in Amps
RoHS-6 hazardous substance compliant*
(does not claim EU RoHS exemption 7B–lead in solder)
J Suffix:
Reversed Pin
Vertical Mount
H Suffix:
Horizontal Mount
Input Voltage Range:
D12
= 10-14 Volts
(12V nominal)
* Contact MPS (DATEL) for availability.
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MDC_LSN 16A D12 Models.C01
Page 2 of 13
LSN-16A D12 Models
Single Output, Non-Isolated, 12V
IN
, 0.75-5V
OUT
16 Amp in DC/DCs SIP Packages
MECHANICAL SPECIFICATIONS
0.37 MAX.
(9.4)
2.00
(50.8)
0.05
(1.27)
1 2 3 4 5
6 7 8 9 10 11
0.23
(5.8)
0.50
(12.7)
ISOLATING
PAD
0.17
(4.3)
2.00
(50.8)
0.37 MAX.
(9.4)
0.23
(5.8)
MAX.
6 7 8 9 10 11
0.50
(12.7)
0.05
(1.3)
1 2 3 4 5
0.030 ± 0.002 DIA.
(0.76 ± 0.05)
0.400
(10.16)
4 EQ. SP. @
0.100 (2.54)
0.56
(14.2)
1.000
(25.40)
0.500
(12.70)
5 EQ. SP. @
0.100 (2.54)
0.05
(1.3)
0.360
(9.1)
0.13
(3.3)
MIN.
0.400
(10.16)
4 EQ. SP. @
0.100 (2.54)
0.030 ± 0.002 DIA.
(0.76 ± 0.05)
1.000
(25.40)
0.500
(12.70)
5 EQ. SP. @
0.100 (2.54)
0.05
(1.27)
0.25
(6.4)
0.11
(2.8)
0.07
(1.8)
0.53
(13.5)
Case B8A
Horizontal Mounting
0.50
(12.7)
0.27
(6.9)
LAYOUT PATTERN
TOP VIEW
0.36
(9.2)
0.45
(11.4)
LAYOUT PATTERN
TOP VIEW
Case B8
Vertical Mounting
(Standard)
RECOMMENDED
COPPER PAD
ON PCB (0.55 SQ. IN.)
0.42 MAX.
(10.7)
2.00
(50.8)
0.23
(5.8)
0.50
(12.7)
1 2 3 4 5
6 7 8 9 10 11
0.05
(1.3)
Dimensions are in inches (mm shown for ref. only).
Third Angle Projection
0.17
(4.3)
0.030 ± 0.002 DIA.
(0.76 ± 0.05)
0.05
(1.3)
0.500
(12.70)
5 EQ. SP. @
0.100 (2.54)
0.07
(1.8)
0.13
(3.3)
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
Components are shown for reference only.
0.36
(9.1)
0.400
(10.16)
4 EQ. SP. @
0.100 (2.54)
1.000
(25.40)
LAYOUT PATTERN
TOP VIEW
0.42
(10.7)
Case B8B
Reverse Pin
Vertical Mounting
(Tyco-compatible)
I/O Connections
Pin
1
2
3
4
Function P59
+Output
+Output
+Sense
+Output
Pin
5
6
7
8
Function P59
Common
Common
+Input
+Input
Pin
9
10
11
Function P59
No Pin
V
OUT
Trim
On/Off Control
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MDC_LSN 16A D12 Models.C01
Page 3 of 13
LSN-16A D12 Models
Performance/Functional Specifications
Typical @ T
A
= +25°C under nominal line voltage and full-load conditions unless noted.
➀
Single Output, Non-Isolated, 12V
IN
, 0.75-5V
OUT
16 Amp in DC/DCs SIP Packages
Physical
Outline Dimensions
Pin Dimensions/Material
See Mechanical Specifications
0.03" (0.76mm) round pins with tin plate
over copper alloy
0.3 ounces (9g)
UL94V-0
FCC Part 15, EN55022 may require
external filter
UL/cUL 60950-1, CSA-C22.2 No.234
IEC/EN 60950-1
Input
Input Voltage Range
Input Current:
Normal Operating Conditions
Standby/Off Mode
Output Short-Circuit Condition
Input Reflected Ripple Current
➁
Input Filter Type
Start-Up Voltage
Overvoltage Protection
Reverse-Polarity Protection
Undervoltage Shutdown
No-load Input Current
Remote On/Off Control
➄
–Negative Logic
10-14 Volts (12V nominal)
See Ordering Guide
5.7mA
30-60mA
30-100mAp-p
Capacitive
9 Volts
None
None
8 Volts
50-80mA
Safety
Weight
Flammability Rating
EMI
Conducted and Radiated
➀
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. All models are stable and regulate within
spec under no-load conditions.
Input Ripple Current is tested and specified over a 5-20MHz bandwidth. Input filtering is
C
IN
= 200µF, C
BUS
= 1000µF, L
BUS
= 1µH.
Current limit inception is given at either cold start-up or after warm-up.
Mean Time Before Failure is calculated using the Telcordia (Bellcore) SR-332 Method 1, Case 3,
ground fixed conditions, T
CASE
= +25°C, full load, natural convection, +67°C max. PCB temp.
The On/Off Control (pin 11) may be driven with open-collector logic or by applying appropriate
external voltages which are referenced to Common, pins 5 and 6.
Short circuit shutdown begins when the output voltage degrades approximately 2% from the
selected setting.
Use only as much filtering to reduce noise
and no more.
Large, low-ESR ceramic caps may
degrade dynamic performance. Thoroughly test your system with all components installed.
➁
ON = no connection or open
(internal pull down), 0 to +0.4V
OFF = +2.8V to +V
IN
or pulled high
3mA maximum
➂
➃
➄
➅
➆
Remote Control On/Off Current
Output
Voltage Output Accuracy
(50% load)
Minimum Loading
➀
Maximum Output Power
Maximum Capacitive Loading
V
OUT
Trim Range
Sense Input Range
Ripple/Noise
(20 MHz bandwidth)
Total Accuracy
Efficiency
Overcurrent Detection and
Short Circuit Protection
Current-limiting Detection
Short Circuit Detection
Short Circuit Protection Method
Short Circuit Current
Short Circuit Duration
Temperature Coefficient
±1.25% maximum
No minimum load
See Ordering Guide
V
OUT
x I
OUT
must not exceed max. power
2,000µF (low ESR, OSCON) or
10,000µF (electrolytic)
➆
±10%
+10% of V
OUT
See Ordering Guide
±3% over line, load and temperature
See Ordering Guide
Absolute Maximum Ratings
Input Voltage:
Continuous or transient
On/Off Control
(Pin 11)
Input Reverse-Polarity Protection
Output Overvoltage Protection
Output Current
15Vdc maximum
+V
IN
None
None
Current limited. Devices can
withstand sustained output short
circuits without damage.
–55 to +125°C
+300°C, 10 seconds maximum.
22-32 Amps, model dependent
98% of V
OUT
setting
➅
Hiccup with autorecovery
See Technical Notes
270-600mA (model dependent)
Continuous, output shorted to ground
±0.02% per °C
Storage Temperature
Lead Temperature
(soldering, 10 sec.)
These are stress ratings. Exposure of devices to greater than 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 to 100% load step to ±2% of Vout) 50µsec typical, 100µsec maximum
Start-Up Time
On/Off to V
OUT
Switching Frequency
Calculated MTBF
➃
Operating Temperature:
(Ambient)
Storage Temperature Range
Thermal Protection/Shutdown
Density Altitude
Relative Humidity
20msec for V
OUT
= nominal
230-370kHz (model dependent)
Environmental
TBD Hours
–40 to +85°C with derating
–55 to +125°C
115°C
0 to 10,000 feet
To +85°C/85%, non-condensing
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,
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MDC_LSN 16A D12 Models.C01
Page 4 of 13
LSN-16A D12 Models
Single Output, Non-Isolated, 12V
IN
, 0.75-5V
OUT
16 Amp in DC/DCs SIP Packages
high-performance
internal
I/O caps, and will operate within spec in most appli-
cations 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 appropri-
ate 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 imped-
ances 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 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.
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 func-
tion 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. 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 20 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 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 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 V
IN
to V
OUT
Start-Up Time is the interval between the time at which a ramp-
ing input voltage crosses the lower limit of the specified input voltage range
(10 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 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
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 conse-
quently 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 cur-
rent 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:
(V
OUT
at pins) x (I
OUT
)
≤
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.
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MDC_LSN 16A D12 Models.C01
Page 5 of 13
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