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DC/DC controller operates at wide temp range

Posted: 15 Oct 2008     Print Version  Bookmark and Share

Keywords:DC/DC controller  gate driver  MOSFETs  on-board regulator 

Linear Technology Corp. has released a high reliability (MP) grade version of the LT3724, a 60V (65V(MAX)) low quiescent current (100uA) switching regulator DC/DC controller used in step-down, step-up, inverting and SEPIC topologies. LT3724MP operates over a junction temperature range of -55°C to 125°C, compared to the "I" grade version's -40°C to 125°C operating temperature range. Linear claims that the product is 100 per cent tested.

A power supply incorporating the LT3724 can convert a 4V to 60V input supply to a regulated output ranging from 1.23V to 36V in applications such as industrial, 12V and 42V automotive, heavy equipment, avionics and telecom power systems.

Linear says that LT3724 has an on-board gate driver capable of slewing large N-channel MOSFETs quickly. It operates at a constant 200kHz switching frequency and safely powers a pre-biased load by not allowing negative currents to flow in the output inductor. Current mode control provides fast transient response, stable operation over a wide range of voltages, load currents, temperatures and capacitor values. Furthermore, the LT3724 has a high voltage on-board regulator to develop the IC bias voltage that can be back driven to increase efficiency. The operating efficiency when used as a step-down converter can be as high as 93 per cent, says Linear. Additional features include precision under-voltage lockout, 10uA shutdown current, programmable soft-start to control the turn-on time, a ±1.3 per cent reference voltage accuracy over temp and thermal shutdown.

The LT3724MP is available from stock in a thermally enhanced 16-pin TSSOP with prices starting at Rs.255.48 ($5.94) each for 1,000 piece quantities.

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