Other Parts Discussed in Thread: TPS57160-Q1,
Good morning,
I am reviewing using the TPS57140-Q1 ( or TPS57160-Q1) in an application where I require a relatively tight controlled voltage for the 1v2 and the 3v3. The TPS57140-Q1 is attractive due to the datasheet stating a 1% accurate reference. However, aspects of the datasheet seem to be in conflict.
Page5:
Voltage reference:
MAX 0.808:
TYP: 0.8
MIN: 0.792
This produces a 0.8V +-1%
However, page 14:
7.3.5 Voltage Reference The voltage-reference system produces a precise ±2% voltage reference over temperature by scaling the output of a temperature-stable band-gap circuit.
a +-1% (using 0.1% resistors, aging and temperature coef) produces a possible worst-case voltage of: 3.2430 -> 3.3578 (also: 1.1842 -> 1.2160)
while +-2% (using 0.1% resistors, aging and temperature coef) produces a possible worst-case voltage of: 3.2102 -> 3.3910 (also: 1.1722 -> 1.228)
Could the tolerance of the TPS57140-Q1 be confirmed: 1% or 2%.
The reason this is key is a tolerance stackup involving the TPS3703E4080 and an external resistor divider to permit testing.