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TPS610981: tps610981 in 2.2V out 3.49V?

Part Number: TPS610981
Other Parts Discussed in Thread: TPS61098, TPS61099

As shown in the schematic diagram below, the input voltage is 2.2V and the output voltage is 1mA. The output voltage of some tps610981 is fixed at 3.49v. The customer emphasizes that the measurement of his multimeter is accurate. What is the output error of tps610981?