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Medical ECG Slide 39

When choosing power options the solution size is a critical design element which can be combined with a low cost approach. Typically for these types of applications, a simple linear regulator is acceptable. An example of a linear regulator is shown on this slide in the upper left box, the TPS78233. This is a linear regulator which allows a small solution size, as well as low power consumption. The circuit only requires external input and output capacitors to complete the solution. When efficiency is a critical parameter it is possible go even further in terms of performance. On the products offering, moving from left to right on the top row of the slide, at the right end is the TPS62237. This is a DC-DC converter which is fully integrated, there are no external MOSFETs required. With the TPS62237 the solution size is very small at 12 mm2 total, including the inductor and the external input and output capacitors. Additionally, potential noise issues are avoided with this state-of-the-art regulator as the power supply ripple rejection is up to 90 dB. The two devices discussed are designed for down regulation, meaning the application has, for example, a 5 V rail and the microcontroller requires a regulated 3.3 V or below. The customer may have an application running on a battery, which requires some type of boost regulation in order to get to the application voltage. The first two items in the bottom row on the slide are boost regulators. As an example, the TPS61221 will operate at 0.7 V and provide 3.3 V as an output voltage for the application. Finally, the TPS63031 is a boost /buck converter. This device is a fully integrated regulator which automatically, with no external control, allows the voltage regulation down in the case of a fully charged battery, but still operate while the battery voltage is equal to or below the voltage rail required for the application. All of the devices shown on this slide are single solutions that target the MSP430 or other low power applications.

PTM Published on: 2012-05-08