The closest device to the 4A LTC3308A and 3A LTC3307A in the Power by Linear portfolio is the pin compatible higher current 6A Silent Switcher 1 LTC3309A. The 10A LTC3310S is a Silent Switcher 2 topology and therefore has integrated hot loop cancellation capacitors, even lower EMI, higher output current, wider switching frequency range, a larger 3x3 package and is capable of multi-phase operation. The LTC3315 is not a silent switcher device, however it offers a very compact dual 4A total current solution.