SLVAER2A April 2020 – November 2020 TPS50601-SP , TPS50601A-SP
Table 2-1 shows the differences between the two devices, as well as describing what the changes mean at a system level.
| Specification | TPS50601A-SP | TPS50601-SP | Comparison |
|---|---|---|---|
| Voltage reference | ±1.5 % | +2.5%, -3.5% | The improved voltage reference allows for tighter regulation for designs where accuracy is critical. |
| Radiation performance | SEFI free up to 75 MeV | Onset at 48 MeV (SEFI MTBE = 700 k/200 k years SET MTBE = 4.6 M/1.6 M years in LEO/GEO) | For space-grade devices radiation performance is critical, so the improved SEFI performance is important for designs looking to withstand the space environment for longer duration missions. |
| VIN | VIN = 3 V to 7 V | VIN = 3 V to 6.3 V | Higher voltage specification allows for higher input voltage to support larger headroom for derating. |
| PVIN | PVIN = 3 V to 7 V | PVIN = 1.6 V to 6.3 V | While the TPS50601-SP has a lower analog input voltage, the TPS50601A-SP has a higher PVIN voltage for when the analog input voltage is taken from the same rail as the higher VIN. |
| Efficiency | 96.6% (PVIN = 3.3 V) | 95% (PVIN = 3.3 V) | The change to include more bond wires allowed for higher efficiency for the TPS50601A-SP. This efficiency increase allows for less heat to be generated and dispersed in space designs where heat dispersal is difficult. |
| Minimum on time | 235 ns | 175 ns | The TPS50601A-SP has a larger on time than the TPS50601-SP which makes it harder to use at higher frequencies and large input to output differentials. |
| SYNC input thresholds | 900 mV/2.45 V (PVIN = VIN = 3 V), 900 mV/4.25 V (PVIN = VIN = 7 V) | 800 mV, 1.85 V | The TPS50601A-SP has a slightly better input threshold for a low, while the trade-off is the TPS50601-SP has a better threshold for a high input. |
| Error amplifier DC gain | 10 kV/V | 39 kV/V | The TPS50601-SP has a higher error amplifier DC gain which can come into play if there is a compensation scheme that will saturate the gain of the error amplifier, but this is largely a non-issue because most compensation schemes will never hit that saturation point. |
| COMP to ISWITCH gm | 22 S | 18 S | A slight change that should be noted when changing compensation between the two devices. |
| VIN shutdown supply current | 2.5 mA | 5.9 mA | The TPS50601A-SP has a lower shutdown current allowing for less power consumption when the device is disabled. |