Linear launches LTC3539/-2 DC/DC converters
Linear Technology
LTC3539/-2 DC/DC converters
Linear Technology has launched the LTC3539/-2, 1MHz, current mode, synchronous boost DC/DC converter with output disconnect and integrated soft-start.
The converter's internal 2A switches can deliver output voltages up to 5.25V from an input voltage range of 0.70V at start-up (0.5V when running) to 5V, which the company said makes it ideal for Li-Ion/Polymer or single/multicell alkaline/NiMH applications.
The LTC3539/-2 can deliver up to 900mA of continuous output current (at 3.3V) from dual alkaline cells or 900mA of continuous output current (at 5V) from a single-cell Li-Ion battery.
Synchronous rectification enables efficiencies up to 94 per cent, while Burst Mode operation lowers quiescent current to only 10uA, providing extended battery run-time in hand-held applications.
The combination of a 2mm x 3mm DFN-8 package and a constant switching frequency of 1MHz (2MHz for the LTC3539-2) minimise inductor and capacitor sizes.
The LTC3539/-2 has internal switches with an RDS(ON) of only 0.09 ohms (N-Channel) and 0.125 ohms (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, minimising surge currents seen by the input supply.
The LTC3539/-2 will also regulate the output voltage when the input voltage exceeds the output voltage, making the device compatible with any battery chemistry.
For applications demanding the lowest possible noise operation, the LTC3539/-2 can be set via an external pin to operate in a continuous frequency mode.
This version runs in continuous mode at all current levels to minimise possible interference of switching noise with noise-sensitive circuitry slightly reducing light load efficiency.
Additional features include anti-ringing control, short-circuit protection, soft-start, and thermal protection.
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