LSM2-T/30-D12 Series
DOSA-SMT, 30A POL DC/DC Converters
Typical unit
FEATURES
n
Non-isolated Point-of-Load (POL) converter,
ideal for distributed bus applications
n
Optimized for CPUs, DSPs and program-
mable logic - FPGAs, ASICs
n
Amps maximum output current
30
n
User-selectable output voltage, 0.8Vdc to
5.0Vdc via trim resistor or voltage input
n
Wide input range 6Vdc to 14Vdc (V
out
<3.6V)
n
Selectable phased start-up sequencing and
tracking
n
Excellent efficiency over output voltage range
n
models available, with or without addi-
Two
tional ground/thermal pads
n
settling, high di/dt slew rate, low
Fast
output noise
n
Extensive self protection plus 'hiccup' short
circuit auto recovery
n
Designed for full safety and emission certification
SIMPLIFIED SCHEMATIC
DESCRIPTION
Today’s high performance CPU and programma-
ble logic devices demand superior performance
from their power source. The LSM2-T/30-D12
series DC/DC converters offer up to 30 Amps
continuous output power with a user-selectable
output of 0.8 to 3.6 Volts. 25 Amps output is
available up to 5.0 V
out
. This tiny converter is
ideal for distributed bus architectures (DBA) and
intermediate power busses with an input range
of 6 to 14 Volts DC. The pinout, trim system and
mechanical footprint is compatible with the DOSA
(www.dosapower.com) industry standard.
To ensure very high performance of powered
logic systems, the LSM2-T/30-D12 features low
output noise, high slew rates (20 Amps/µSec.),
fast transient response (25 µSec settling) and
tight line and load regulation. Many logic devices
require controlled start up and tracking capabili-
ties. The LSM2-T/30-D12 includes a Sequence/
Track function and prebias protection against
external startup voltages. Other DBA features
include no additional external components
required, stable no-load operation, up to 10,000
µF output load capacitance and no reverse
conduction.
System functions offer a remote On/Off con-
trol, two additional ground pins (optional) and a
load Sense input. Agency certifications include
UL/EN 60950-1, CAN/CSA-C22.2 60950-1, IEC
60950-1, and FCC emissions characterization.
The automated surface mount assembly is fully
RoHS (Reduction of Hazardous Substances)
lead-free construction and attachment. The
LSM2-T/30-D12 mounts to its host carrier
board via reflow-soldered PCB pads.
The extraordinary efficiency means low heat
and freedom from expensive, bulky heat sinks. A
wealth of protection features include input under-
voltage shutdown, output overcurrent current lim-
iting, short circuit protection and overtemperature
shutdown/recycle.
+INPUT
+OUTPUT
Additional
ground/thermal
pads
*
V
CC
PWM
CONTROLLER
CURRENT
SENSE
+SENSE
COMMON
COMMON
ON/OFF
CONTROL
V
TRACK
/
SEQUENCE
INPUT
REFERENCE &
ERROR AMP
V
OUT
TRIM
*One phase of two is shown.
Typical topology is shown.
Pb
Lead-free
construction/attach
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_LSM2_T30_D12 Series.B11
Page 1 of 12
LSM2-T/30-D12 Series
DOSA-SMT, 30A POL DC/DC Converters
PERFORMANCE SPECIFICATIONS AND ORDERING GUIDE
Output
Model Family
LSM2-T/30-D12-C
LSM2-T/30-D12R-C
Input
Regulation (max.)
Line
±0.2%
±0.2%
➆
V
OUT
(Volts)
0.8-5
0.8-5
I
OUT
(Amps)
30
30
Power
(Watts)
125
125
R/N (mVp-p)
Typ.
15
15
Max.
25
25
Load
±0.4%
±0.4%
V
IN
Nom.
(Volts)
12
12
Range
(Volts)
6-14
6-14
I
IN
(mA/A)
210/11.1
210/11.1
Efficiency
Min.
92.5%
92.5%
Typ.
94%
94%
Package
(Case/
Pinout)
C71, P72
C71, P72
Typical @ Ta=+25°C. under nominal line voltage and full-load conditions unless noted. Nominal
output is +5 Volts.
Ripple/Noise (R/N) is tested/specified over a 5 Hz to 20 MHz bandwidth and may be reduced by
adding external filtering. R/N is shown at V
out
<= 2.5 Volts.
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.
LSM2-T/30-D12 efficiencies are shown at V
out
= 5 Volts.
I
out
max. is 30 Amps with Vin = 0.8 to 3.6 Volts. With V
in
>3.6 Volts, I
out
max. is 25 Amps.
If V
out
>3.63V, input range is 7-14V.
PART NUMBER STRUCTURE
L SM2
-
T
/
30
-
D12 R
-
C
Output Configuration:
L
= Unipolar
Low Voltage
Non-Isolated SMT
Nominal Output Voltage:
0.8-5.0 Volts
Maximum Rated Output
Current in Amps
MECHANICAL SPECIFICATIONS
Case C71
1.30
(33.02)
INPUT/OUTPUT CONNECTIONS P72
Pad
Function
1
2
3
On/Off Control
+Input
Sequence/Track In
Common
+Output
Trim
Sense In
Not used
Additional Ground (optional)
RoHS-6 compliant
Additional Grounds:
Blank
= Omitted
R
= Installed
Input Voltage Range:
D12
= 6-14 Volts (12V nominal)
See note 7 above.
0.36
(9.14)
Component locations
are typical.
0.120
(3.05)
3
4
0.062
(1.57)
0.950 (24.13)
5 EQ. SP. @
0.190 (4.83)
5
6
7
8
4
5
6
7
8
*
0.155
(3.94)
0.114
(2.9)
*
2
*
1
0.48
(12.19)
0.53
(13.46)
Dimensions are in inches (mm)
0.430
(10.92)
BOTTOM VIEW
0.027 (0.68)
1.177
(29.90)
0.075 (1.91)
0.120 (30.5)
0.048
(1.22)
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Technical enquiries
email: sales@murata-ps.com, tel:
+1 508 339 3000
MDC_LSM2_T30_D12 Series.B11
Page 2 of 12
LSM2-T/30-D12 Series
DOSA-SMT, 30A POL DC/DC Converters
RECOMMENDED PAD LAYOUT
0.487 (12.37)
0.677 (17.20)
0.867 (22.02)
1.057 (26.85)
1.177 (29.90)
1.204 (30.58)
Optional Additional Ground
Pad Size: 0.095 x 0.082 (2.41 x 2.08)
MDC_LSM2_T30_D12 Series.B11
Page 3 of 12
0.000 (0.00)
0.107 (2.72)
0.405 (10.29)
Optional Additional Ground
Pad Size: 0.095 x 0.082 (2.41 x 2.08)
0.120 (3.05)
0.089 (2.26)
0.000 (0.00)
0.025 (0.64)
Pad Size: Min. 0.140 x 0.095 (3.56 x 2.08)
Not Used
SENSE
TRIM
V
out
GND
SEQ
GND (-H)
ON/OFF
0.297 (7.54)
GND (-H)
V
in
Dimensions are in inches (mm)
Additional Ground/Thermal Pads (“R” models)
The LSM2-T/30-D12 is optionally available with two additional ground
pads for increased current handling and better heat transfer. These are
indicated with the “R” designator in the model number, LSM2-T/30-D12R-C.
MPS recommends that users lay out their PC boards to accept these two
pads for larger current applications. Please note that the Derating curves for
the “R” models accept higher temperature and greater current limits than
units without the additional pads.
To realize the additional current and thermal capacity of “R” models, you
must have a substantial area of several square inches of copper etch flow-
soldered to these pads and sufficient feed-throughs or other means of con-
ducting current. The “R” pads and the standard pads 1 and 2 are in parallel.
If your application uses a standard DOSA pad layout and you cannot con-
nect to these ground pads, order model LSM2-T/30-D12-C without the “R”
designator. Please observe the lower Derating curves for standard, “non-R”
models.
www.murata-ps.com
Technical enquiries
email: sales@murata-ps.com, tel:
+1 508 339 3000
LSM2-T/30-D12 Series
DOSA-SMT, 30A POL DC/DC Converters
Performance and Functional Specifications
See Note 1
Input
Input Voltage Range
Isolation
Start-Up Voltage
Undervoltage Shutdown
Overvoltage Shutdown
Internal Input Filter Type
Reverse Polarity Protection
Input Current:
Full Load Conditions
Inrush Transient
Shutdown Mode (Off, UV, OT)
Output Short Circuit
No Load, 5V out
Low Line (V
in
=Vmin, 5V
out
)
Remote On/Off Control
(Note 5)
Negative Logic (No model suffix)
(See Note 18)
Current
Minimum Loading
Accuracy (50% load)
Voltage Adjustment Range
(Note 13)
Overvoltage Protection
(Note 20)
Temperature Coefficient
Ripple/Noise (20 MHz bandwidth)
Line/Load Regulation
(See Tech. Notes)
Efficiency
Maximum Capacitive Loading
(Note 15)
Cap-ESR=0.001 to 0.01 Ohms
Cap-ESR >0.01 Ohms
Current Limit Inception
(Note 19)
(98% of V
out
setting)
Short Circuit Mode
(Note 6)
Short Circuit Current Output
Protection Method
Short Circuit Duration
Prebias Startup (Note 16)
Sequencing
Slew Rate
Startup delay until sequence start
Tracking accuracy, rising input
Tracking accuracy, falling input
Remote Sense to V
out
2V per millisecond max.
10 milliseconds min.
V
out
=±100 mV of Sequence In
V
out
=±200 mV of Sequence In
0.5V max. (Note 7)
600 mA
Hiccup autorecovery upon overload
removal. (Note 17)
Continuous, no damage (output shorted
to ground)
Converter will start up if the external
output voltage is less than Vnominal.
5,000
µF
10,000
µF
48 Amps (cold startup)
42 Amps (after warm up)
See Ordering Guide
Not isolated. Input and output
Commons are internally connected.
5.6 Volts
5 Volts
None
Calculated MTBF
(4)
Operating Temperature Range
With derating
Storage Temperature Range
Thermal Protection/Shutdown
Relative Humidity
Dynamic Characteristics
Dynamic Load Response
(50-100-50% load step, di/dt=20A/µSec)
Start-Up Time
(V
in
on to V
out
regulated or On/Off to V
out
)
Switching Frequency
60
µSec
to within
±2%
of final value
10 mSec for V
out
=nominal
430
±30
KHz
Environmental
3,917,077 Hours
-40 to +85°C. (Note 9)
See Derating Curves (Note 12)
-55 to +125°C.
+115°Celsius
to 85%/+85°C, non-condensing
Reflected (Back) Ripple Current
(Note 2) 50 mA pk-pk
Capacitive
None, see fuse information
See Ordering Guide
0.4 A
2
Sec.
5 mA
60 mA
210 mA
18.9 Amps
ON = 0 to +0.55 V max.
OFF = +3.0V min. to +V
in
max.
1.3 mA max.
Physical
Outline Dimensions
Weight
Electromagnetic Interference
(conducted and radiated)
Safety
See Mechanical Specifications
0.28 ounces (7.8 grams)
FCC part 15, class B, EN55022 (may need
external filter)
Designed to meet UL/cUL 60950-1 CSA-C22.2
No. 60950-1, IEC/EN 60950-1
Output
No minimum load
±1.5
% of Vnominal
See Ordering Guide
None
±0.01%
per
ο
C of V
out
range
See Ordering Guide and Note 8
See Ordering Guide and Note 10
See Ordering Guide
Input Voltage (Continuous or transient)
On/Off Control (negative logic)
Input Reverse Polarity Protection
Output Current
(Note 7)
Storage Temperature
Lead Temperature
(soldering 10 sec. max.)
Absolute Maximum Ratings
+15 Volts
Zero Volts min. to +V
in
max.
None, s
ee fuse section
Current-limited. Devices can withstand
sustained short circuit without damage.
-55 to +125
°
C.
+280°C.
Absolute maximums 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 nor recommended.
Specification Notes:
(1) Specifications are typical at +25°C, V
in
=nominal (+12V), V
out
=nominal (+5V), full load, external
caps and natural convection unless otherwise indicated. Tests at full power should supply
substantial forced airflow.
All models are tested and specified with external 0.1µF and 10 µF paralleled ceramic/tantalum
output capacitors and a 22 µF 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.
(2) Input Back Ripple Current is tested and specified over a 5 Hz to 20 MHz bandwidth. Input filter-
ing is C
in
=2 x 100 µF tantalum, Cbus=1000 µF electrolytic, Lbus=1 µH.
(3) 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.
(4) Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method 1, Case 3,
ground fixed conditions, Tpcboard=+25°C, full output load, natural air convection.
(5) The On/Off Control may be driven with external logic or by applying appropriate external volt-
ages 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
.
(6) Short circuit shutdown begins when the output voltage degrades approximately 2% from the
selected setting.
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Technical enquiries
email: sales@murata-ps.com, tel:
+1 508 339 3000
MDC_LSM2_T30_D12 Series.B11
Page 4 of 12
LSM2-T/30-D12 Series
DOSA-SMT, 30A POL DC/DC Converters
Specification Notes continued:
Resistor Trim Equation
(7) 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 volt-
age drop may cause the converter to exceed maximum power dissipation.
(8) Output noise may be further reduced by adding an external filter. See I/O Filtering and Noise Reduc-
tion.
(9) All models are fully operational and meet published specifications, including “cold start” at –40° C.
(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 will be reviewed under scheduled quantity special order.
(12) Maximum continuous power requires that all on-board components not exceed +128°C pack-
age temperature.
(13) Do not exceed maximum power specifications when adjusting the output trim.
(14) The “R” option includes extra ground pads. These pads offer two important features. In addition
to carrying extra current, they also help dissipate additional heat. MPS strongly recommends
soldering the “R” pads to a thick ground plane with sizable area.
The Operating Temperature
specification listed above assumes that these additional ground pads are connected to
a substantial ground plane below the converter ( at least several square inches).
(15) The maximum output capacitive loads depend on the the Equivalent Series Resistance (ESR)
of the external output capacitor. Larger caps will reduce output noise but may slow transient
response.
(16) Do not use Pre-bias startup and sequencing together. If you do not use the track function, leave
the seq/trk pin open.
(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) Output current limiting is disabled at start up to avoid overcurrent shutdown while charging
external bypass capacitors.
1200
R
TRIM
(in Ohms) =
---------------------
-100
V
OUT
– 0.8
The fixed trim resistors to set the output voltage are:
V
out
0.8V.
1.0V.
1.2V.
Rtrim (Ohms)
V
out
Rtrim (Ohms)
Open
2.0V.
0.90 KΩ
5.90 KΩ
2.5V.
605 Ω
2.90 KΩ
3.3V.
380 Ω
1.5V.
1.614
KΩ
5.0V.
185.71
Ω
1.8V.
1.10 KΩ
Output Adjustments
The LSM2-T/30-D12 series includes a special output voltage trimming fea-
ture which is fully compatible with competitive units. The output voltage may
be varied using a single trim resistor from the Trim Input to Power Common.
Use a precision, low-tempco resistor (±100 ppm/
ο
C) mounted close to
the converter with short leads. Be aware that the voltage accuracy is
±1.5%
(typical) therefore adjust this resistance to achieve your desired output.
Voltage Reference,
Figure 2. Voltage Trim Connections
Voltage Trim
The LSM2 Series may also be trimmed using an external low-noise voltage
applied between the Trim input and Output Common. Be aware that the inter-
nal “load” impedance looking into Trim pin is below 1000 Ohms and includes
factors from the output voltage. Therefore, use a low impedance source
resistance in your external voltage reference.
The fixed trim voltages to set the output voltage are:
V
out
(typ.)
Vtrim (Volts)
0.80V.
Open
2.0 V.
0.720V.
1.0V.
0.787V.
2.5V.
0.687V.
1.2V.
0.773V.
3.3V.
0.633V.
1.5V.
0.753V.
5.0V.
0.520V.
1.8V.
0.733V
Figure 1. Trim Resistor Connections
V
out
(typ.)
Vtrim (Volts)
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MDC_LSM2_T30_D12 Series.B11
Page 5 of 12
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