LSM-0.75/16-D12-C Murata Power Solutions Inc, LSM-0.75/16-D12-C Datasheet - Page 11

• Manufacturer Part Number: LSM-0.75/16-D12-C
• Description: DC/DC SM 16A 12-0.75V Non-Iso
• Manufacturer: Murata Power Solutions Inc
• Series: LSMr

Specifications of LSM-0.75/16-D12-C

• Product: Non-Isolated / POL
• Output Power: 12 W
• Input Voltage Range: 10 V to 14 V
• Number Of Outputs: 1
• Output Voltage (channel 1): 0.75 V
• Output Current (channel 1): 16 A
• Output Type: Low Voltage
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Tape & Reel Surface Mount Package
Murata Power Solutions’ LSM series DC/DC converters are the only higher-
current (16A) SMT DC/DCs that can be automatically “pick-and-placed” using
standard vacuum-pickup equipment (nozzle size and style, vacuum pressure
and placement speed may need to be optimized for automated pick and place)
and subsequently refl owed using high-temperature, lead-free solder.
assembled by their vendors with high-temperature solder (usually Sn96.5/
Ag3.5 with a melting point of +221°C) so that you may attach them to your
board using low-temperature solder (usually Sn63/Pb37 with a melting point
of +183°C). Conceptually straightforward, this “stepped” solder approach has
its limitations, and it is clearly out of step with an industry trending toward
the broad use of lead-free solders. Are you to experiment and develop refl ow
profi les from other vendors that ensure the components on those DC/DC never
exceed 215–216°C? If those components get too hot, “double-refl ow” could
compromise the reliability of their solder joints. Virtually all these devices
demand you “cool down” the Sn63 profi le you are likely using today.
Virtually all SMT DC/DCs today are unprotected “open-frame” devices
250
221
200
183
150
100
50
0
50
Sn96.5/Ag3.5 Melting Point
Sn63/Pb37 Melting Point
100
www.murata-ps.com
PCB TEMPERATURE INSIDE THE HEAT SHIELD
150
Figure 6. Refl ow Solder Profi le
Time (Seconds)
200
solders no one else has. Nevertheless, we have a simple and practical, straight-
forward approach that works. We assemble our LSM SMT DC/DCs using a
high-temperature (+216°C), lead-free alloy (Sn96.2%, Ag2.5%, Cu0.8%,
Sb0.5%). The LSM design ensures co-planarity to within 0.004 inches (100μm)
of the unit’s copper leads. These leads are gold-plated with a nickel underplate.
See Mechanical Data for additional information.
ing the package leads, provides thermal insulation to internal components
during refl ow and its smooth surface ideally doubles as the vacuum pick-up
location also. The insulation properties of the heat shield are so effective that
temperature differentials as high as 50°C develop inside-to-outside the shield.
Oven temperature profi les with peaks of 250–260°C and dwell times exceed-
ing 2 minutes above 221°C (the melting point of Sn96.5/Ag3.5) are easily
achieved.
MPS is not exempted from the Laws of Physics, and we do not have magic
The disposable heat shield (patent pending), which has a cutaway expos-
250
Non-Isolated, 13-80W SMT DC/DC Converters
HEAT SHIELD OUTSIDE TEMPERATURE
Technical enquiries email: [e-mail], tel:
LSM-16A D12 Models
300
MDC_LSM 16A D12 Models.A05 Page 11 of 12
350
400
[phone]