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您好，您参考下datasheet Page25介绍，如果想得到稳定3.3V LDO输出，需要满足下面条件：www.ti.com/.../dac161s997.pdf
To ensure stable 3.3-V LDO output under these conditions, the following relation must be fulfilled.
V(IN_LDO) (at minimum VSUPPLY & minimum ILOOP ) > VIN_LDO (MIN REQUIRED at 3.3 mA) (17)
[(100 Ω × 200 μA)+ VZENER + 0 V + (20 Ω X 200 μA)] > 3.4 V
[VZENER + 0.024 V] > 3.4 V
