Other Parts Discussed in Thread: TPS62823, TPS62826, TPS62135, TPS54339E, TPS62827
I read the Chris Glaser's article on LPDDR4 regulators (great article), and I need to ask a few questions.
1) The TPS62088 datasheet gives a very low value for THETAjc, which AFAIK may be due to measurement difficulties.
Assuming Vin=3.3V, Vout=1.1V, efficiency=0.85, Iout=3A, we'd lose about 0.6W in the device.
Can I meaningfully use the small THETAjc to estimate the case temperature? Is it intended that, for this device, most of the heat is conducted into the PCB?
2) It seems to me that the TPS62823 would fit my LPDDR4 application as well as the TPS62088. I'd like to ask: is there any reason why the TPS62823 wasn't included in Chris Glaser's LPDDR4 article? In other words, is there any reason not to use TPS62823 to make a 1.1V rail for LPDDR4?
3) The TPS62823 has a larger package (QFN). Which package would be considered to have better thermal performance for a fanless system - the TPS62088's WCSP or the TPS62823's QFN?