Linear Technology introduces LT3724MP controller
Linear Technology
LT3724MP controller
Linear Technology has unveiled a high-reliability (MP) grade version of the LT3724 60V (65V maximum) low quiescent current (100uA) switching regulator DC/DC controller.
The controller is used in step-down, step-up, inverting and SEPIC topologies.
The LT3724MP operates - and is 100 per cent tested - over a junction temperature range of -55C to +125C, compared to the 'I' grade version's -40C to +125C operating temperature range.
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.
The LT3724 features an onboard gate driver capable of quickly slewing large N-channel MOSFETs.
It operates at a constant 200kHz switching frequency and safely powers a pre-biased load by preventing negative currents to flow in the output inductor.
Current-mode control provides fast transient response, stable operation over a range of voltages, load currents, temperatures and capacitor values.
Furthermore, the LT3724 has a high-voltage onboard 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.
Additional features include precision undervoltage lockout, 10uA shutdown current, programmable soft-start to control the turn-on time, a +/-1.3 per cent reference voltage accuracy over temperature and thermal shutdown.
The LT3724MP is available from stock in a thermally enhanced 16-pin TSSOP, with prices starting at USD5.94 (GBP4.04) each for 1,000-piece quantities.
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