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TPS62745: Alternative part number for TPS62745 with high efficiency for battery based design

Part Number: TPS62745
Other Parts Discussed in Thread: TPS629203

Hi Team,

Is any better device being available compared to TPS62745? 

High level Requirements:

Input voltage range= 2.7 to 15V

I out current = 250 to 300mA

V out voltage =3.3V and 5V

Efficiency =>85%

Quiescent current =< 2uA


Our Lock is operating with battery VBAT- 6V/2300mAH and Min/Max range (3.6 to 6.4V)