Linear Technology announces the LTC3428, a 2-phase, current mode boost converter capable of supplying 2 A at 5 V from a 3.3 V input in a 3 × 3 mm DFN package. Its input voltage range of 1.6 V to 4.5 V is suited for Li-Ion and multicell Alkaline/NiMH applications. External parts count and size are minimized by a 1 MHz per phase switching frequency and a 2-phase design. Two phase operation reduces peak inductor currents and capacitor ripple current, doubling the effective switching frequency and minimizing both inductor and capacitor size. External compensation allows the feedback loop response to be optimized for a particular application. Two 93 mΩ, 2 A N-channel MOSFET switches allow the LTC3428 to deliver high efficiency from input voltages as low as 1.6 V. The device also features an active low shutdown pin to reduce supply current to below 1 uA, internal soft-start, anti-ringing control, and thermal shutdown.
Linear Technology Corporation