SSZTAV1 september   2016 LMR23610


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Callie Wallace

As a millennial, it’s all about having the newest phones and gadgets, not to mention playing the newest games (Pokémon Go anyone?). But does newer always equal better? Personally, I’d rather stick with my bike than ride one of those hoverboards. Remember them? They were the hottest item of the 2015 holiday shopping season before people realized they had a slight issue with spontaneous combustion.

There are certain times in life where using a high-quality and reliable product or brand outweighs novelties and fads. A few things that come to mind: my car, my furniture and my grandmother’s peach cobbler recipe. Trust me. Nothing could ever improve upon that peach cobbler recipe.

Even the semiconductor world isn’t immune to trends and marketing hype. For example, in the world of direct current (DC)/DC regulator packaging, the focus is on creating the smallest package possible. However, semiconductor developers who focus solely on creating that smallest package possible seem to have forgotten one very important fact: there are tens of thousands of customers worldwide who still prefer traditional packages with pins or leaded packages, despite their larger size.

Don’t get me wrong: TI is also investing in cutting-edge package technologies. However, we haven’t forgotten our pin/leaded package-loving customers and so continue to release new products like the new SIMPLE SWITCHER® LMR23610/25/30 36VIN buck regulator family in trusted package technologies like small outline integrated circuit (SOIC)-8.

You may be curious as to why so many customers still like ancient packages like the 8-pin SOIC, or SOIC-8, when there are so many newer and smaller technologies available. Many customers prefer packages because they are easier to work with in the lab and the factory. The leads on SOIC-8 packages are very easy to hand-solder and work with on the bench. Designers can easily debug their circuits since the pins are exposed. In the factory, using a leaded package technology technology with pins enables designers to use visual inspection technology to confirm that the device has been soldered correctly and to screen out any faulty boards.

On the other hand, with a leadless package like a very thin small outline no-lead (WSON) or a quad flat no-lead (QFN), the pins are completely underneath the package, making it extremely difficult to solder or debug by hand. The location of the pins also makes visual inspection impossible, necessitating additional X-ray inspection equipment to confirm proper soldering connections.  Watch a video “Engineer It: How to Simplify the Power Supply Prototyping and Manufacturing” for a soldering demonstration on an SOIC-8 package.

Additionally, the SOIC-8 on the LMR236xx family includes a single die attach pin (DAP) on the bottom to help extract the heat. This enables a lower junction-to-ambient thermal resistance (theta J/A) and better thermal performance than many QFN-style packages, like competitor A’s package in Figure 1.

GUID-2759606B-6090-44F8-8827-6C8DE24718E6-low.png Figure 1 Thermal Images Taken at vIN = 12V, vOUT = 5A at 3A, 2MHz

For many customers, the easy-to-use aspects of a package with pins outweigh the size advantages of a leadless package. Whether you prefer to stay on the cutting edge of package technology or want peace of mind from using a trusted and reliable package, the SIMPLE SWITCHER regulator family has an option for you. Check our website for more information about the SIMPLE SWITCHER LMR23610/25/35 family.