Linear Technology has a 1MHz current mode, synchronous boost DC-DC converter with output disconnect and integrated soft-start capability.

An internal 1A switch can deliver output voltages as high as 5.25V from an input voltage range of 0.70V (start-up, 0.5V when running) to 5V. As a result the converter can be used for Li-Ion/Polymer or single/multicell alkaline/NiMH applications.

The LTC3528/B can deliver up to 200mA of continuous output current (at 3.3V) from a single alkaline cell or 400mA from dual alkaline cells. Synchronous rectification enables efficiencies of up to 94 per cent and a burst mode capability will lower quiescent current to 12[micro]A.

The LTC3528/B has internal switches with an RDS(ON) of 0.175ohm (n-channel) and 0.25ohm (p-channel).

The output disconnect feature allows the output to be completely discharged in shutdown. It also limits the inrush of current during start-up, minimizing surge currents seen by the input supply.

The LTC3528/B will also regulate the output when the input voltage exceeds the output voltage.

Other features include anti-ringing control, short-circuit protection, soft-start, and thermal protection.