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DC/DC converter packs automatic fault detection

Posted: 13 Mar 2009 ?? ?Print Version ?Bookmark and Share

Keywords:DC/DC converter? fault detection automatic? USB on the go?

Linear Technology Corp. has launched the LTC3529, a 1.5MHz, current mode synchronous boost DC/DC converter with automatic overload fault detection. The device's USB On-the-Go-specific protection circuit includes a fault flag that can be programmed to either latchoff or restart after a timeout duration when the bus is overloaded.

The LTC3529's internal 1.5A switches can deliver up to 500mA of output current to a fixed 5V output from a single-cell Li-ion battery. An input voltage range of 1.8V to 5.25V makes the LTC3529 suitable for Li-ion/polymer or multicell alkaline/NiCd/NiMH applications. Synchronous rectification enables efficiencies of up to 95 percent, providing extended battery run-time in handheld applications. In addition, the combination of a 2mm x 3mm DFN-8 package and a constant switching frequency of 1.5MHz minimize both inductor and capacitor sizes, providing a tiny solution footprint required in handheld applications.

The device uses internal switches with an RDS(ON) of only 90m? (n-channel) and 120m? (p-channel) to deliver efficiencies as high as 95 percent. The output disconnect feature allows the output to be completely disconnected in shutdown and also limits the inrush of current during start-up, minimizing surge currents seen by the input supply. The LTC3529 will also regulate the output when the input voltage exceeds the output voltage. Additional features include anti-ringing control, short-circuit protection, soft-start and thermal protection.

LTC3529EDCB is available from stock in an 8-lead DFN package. 1,000-piece pricing starts at $2.05.





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