The TPS7H1121 features an accurate voltage reference, which is essential in minimizing the intrinsic error of the LDO.

Output voltage accuracy specifies minimum and maximum output voltage error, relative to the expected nominal output voltage. The accuracy specification in the Section 6.5 table presents two operating regions, one in which the V_IN is above 3V and one when V_IN is in the "low-input" voltage region (2.25V ≤ V_IN ≤ 3V).

The ±1.5% specification applies across the complete temperature range of –55°C to 125°C, across the input voltage range of 3V ≤ V_IN ≤ 14V, when the dissipated power is ≤3W, and up to the full load (10mA ≤ I_OUT ≤ 2A).

When V_IN is below 3V (2.25V ≤ V_IN ≤ 3V), the output voltage accuracy is adjusted to ±1.8%.

A few additional details to the measurement are noted:

• The range of V_IN, I_OUT and temperature mean the specification applies across all load and temperature combinations. This is accomplished by testing multiple bias conditions that cover various corners.
• Footnote 3 in Section 6.5 specifies that the measurement is done with a power dissipation limit that is limited to a maximum 3W. This is due to tester thermal limitations.
• The test conditions specify a minimum of 10mA and not 0mA for more robust accuracy measurements. However, in a normal application the TPS7H1121 device does not have a minimum load current for stability
• TI does not recommend including the following error terms into the V_ACC specification as the following terms are inherently covered by the V_ACC parameter:
  • V_FB accuracy
  • ΔV_OUT/ΔV_IN (line regulation)
  • ΔV_OUT/ΔI_OUT (load regulation)
  • V_OUT tempco
• The error due to the feedback resistors, such as the specified tolerances can be added to the V_ACC specification.
• For additional information on determining accuracy see Section 9.2.2.2.