Electronics > Projects, Designs, and Technical Stuff
PSA: do not use the TPS61099 boost reg in your designs
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IDEngineer:

--- Quote from: Hydron on January 24, 2019, 06:07:32 pm ---sure enough, very poor wirebond quality compared to earlier samples, bad enough to cause reliability issues - the parts should have never made it out of TI's door. Now in the process of designing them out of everything...
--- End quote ---
Sheesh, what happened to TI? Used to be they were like Linear... pricey but you could rely on them for great products with great support. Sounds like someone is now optimizing for short term profits instead of long term design wins to maximize the area (profit) under the curve.

If I had to guess, maybe their semiconductor division used to be run by IC people but is now run by MBA's?
schmitt trigger:
Your guess may be accurate.

Also, they have grown to be very large through acquisitions. When that happens, the culture shock in the acquired companies cause the best talent to migrate somewhere else.
jeremy:
A neat little tidbit from the LTC3528 datasheet which might give a clue to what the issue could be with the TI converter:


--- Quote ---The converter is shut down by pulling the SHDN pin below 0.25V, and activated by pulling SHDN above 0.88V. Although SHDN can be driven above VIN or VOUT (up to the absolute maximum rating) without damage, the LTC3528/LTC3528B have a proprietary test mode that may be engaged if SHDN is held in the range of 0.5V to 1V higher than the greater of VIN or VOUT. If the test mode is engaged, normal PWM switching action is interrupted, which can cause undesirable operation in some applications. Therefore, in applications where SHDN may be driven above VIN, a resistor divider or other means must be employed to keep the SHDN voltage below (VIN + 0.4V) to prevent the possibility of the test mode being engaged.
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amyk:
That's better than nothing, but I think the best way to design something like that is either fully document what the test mode does and how to exit it, or fuse it off permanently so it would never be entered again. Weird undocumented functionality in an IC is overall bad for a variety of reasons.
LukeW:
Who makes decent affordable DC-DC silicon other than TI?

Don’t say high-price LT.
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