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Linear Tech's DC/DC converters with true output disconnect

Posted: 21 Oct 2005 ?? ?Print Version ?Bookmark and Share

Keywords:linear technology? dc/dc converter? ltc3525-3.3? ltc3525-5?

Linear Technology Corp. released two 400mA synchronous step-up DC/DC converters with true output disconnect and inrush current limiting in SC70 packages. The new LTC3525-3.3 and LTC3525-5 converters operate from an input voltage range of 1V to 4.5V, making them suitable for single- and multicell alkaline/NiCd/NiMH, as well as Li-ion applications.

The LTC3525-3.3 offers a fixed 3.3V output whereas the LTC3525-5 has a fixed 5V output. The LTC3525-3.3 can deliver up to 140mA of continuous output current from dual AA alkaline cells, while the LTC3525-5 can deliver up to 175mA at 5V from a 3V input. Both devices use synchronous rectification to enable efficiencies of up to 95 percent. Their Burst Mode operation lowers quiescent current to 7?A, providing maximum battery run-time in handheld applications. The combination of an SC70 package plus only 3 tiny externals provides small solution footprints as required in space constrained applications.

The LTC3525-3.3 and LTC3525-5 both incorporate internal switches with an RDS(ON) of 0.5 ohm (N-Channel) and 0.8 ohm (P-Channel). Combined with their adaptive power control switching topology, they deliver efficiencies greater than 90 percent to loads varying from 1mA to 100mA. Both parts offer output disconnect and inrush current limiting to restrict the current during start-up, minimizing surge currents seen by the input supply; and feature anti-ringing control, short-circuit protection and thermal protection.

Both the LTC3525ESC6-3.3 and LTC3525ESC6-5 are available from stock in a 6-lead SC70 package. For 1,000-piece orders, pricing starts at $1.75 each.




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