Reference circuit for LTC4215

Question

Hi, 
 We are using ADM1278 hot swap controller in our server board schematic. PFA schematic page for reference. But due to the unavailability of ADM1278, we need to find an alternate. We are considering LTC4215 since it is in stock and has similar functionality. 
 However, in the datasheet of LTC4215 we could only find reference circuit for 16.6 A circuit breaker (page 24). Our application requires 140A current. Would it be possible to share a reference circuit for higher current using LTC4215? Also is it ok to use multiple FETs in parallel connected to GATE pin of hot swap controller to handle high current requirements? 
 Also, please let us know if any other suitable alternate is available for ADM1278. 
 Thanks, 
 Avani

nenger · Accepted Answer

Hi Avani, 
 The ADM1278 is currently not recommended for new designs. Instead we recommend the LTC4281/2. 140A is a lot of current, so the single gate LTC4281 may be adequate, and the LTC4281 should be a direct replacement for the single gate ADM1278. However, if you need a very robust high current solution for 140A and above then I recommend the dual gate LTC4282, which is more complex, but will provide more protection options for high power circuits. 
 The DC2442 (LTC4282) demo board provides a good reference design that is close to the 140A spec that you are looking for. The DC2278 (LTC4281) demo board provides a smaller reference design, but the board can probably be modified by soldering additional FETs and changing the BOM to meet your requirements. 
 Thanks! Nathan)

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Reference circuit for LTC4215