LT3439 Design

Question

Hi, I would like to use the LT3439 to create an isolated DC-DC converter with 5V input and bipolar output. 
 I need a very low ripple voltage so my idea is to connect at the output of LT3439 an LT3042 and LT3093. 
 I need a voltage +2.5V - 300mA / -2.5V - 300mA Please can you susggest to me suitable diodes and the transforme for my application? 
 My device is power safety so I would like to realize a voltage at the output of LT3439 enough for the dropout. Thanks in advance for your help. Regards, Carmelo

MarkusHP · Accepted Answer

Hello, 
 please consider the newer LT3999 vs the more mature LTC3439. 
 LT3999 Datasheet and Product Info | Analog Devices 
 You'll find on page 12 an example with bipolar output supplies and LDOs for better regulation and additional PSRR. For the mentioned 300mA the LDOs in the datasheet example are too small, here I recommend our new dual LDO: 
 LT3097 Datasheet and Product Info | Analog Devices 
 The demoboard of LT3999 'resembles' the mentioned example (DC2049A) 
 Hope that helps.)

Carmelo · Answer

Hello, 
 Thank you very much for your suggestions. Please can you suggest to me the transformer for mine application? 
 I need the best efficiency that is possible. 
 Thank you very much. 
 
 Best regards,

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LT3439 Design

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