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TPS7A20: VIN is lower than Vout

Part Number: TPS7A20

Hi Experts,

My customer is considering to use TPS7A20 to generate 3.3Vout(fixed) from battery. Battery supply voltage is 3.6V and decresing gradually. When the battery voltage is lower than VOUT + VDO(Dropout voltage), Vout starts to be lower than 3.3V. For example, when a battery voltage is 3.0V, Vout would be 3.0 - VDO(140mV max). If Vout is used for MSP430 whose min voltage is 1.8V, MSP430 continues to work. 

Usually, LDO is used VIN + VDO > VOUT. Can customer use LDO with this low Vin condition?

Regards,

Uchikoshi