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35V APD Biasing

Other Parts Discussed in Thread: LM3530, TPS61161A, TPS61165, TPS61170


I'm looking to design a DCDC for APD biasing. DCDC requirement as following:

Vout = 35V

Vin = 3.3+/-5%

Iload = Max 20mA

Key concerning area: Smallest PCBA solution and efficiency at least >85%

I've look into below parts: LM3530, TPS61161A and TPS61165. Can i know which is the smallest PCBA solution? Is there any recommendation on PCBA layout?