Linear Tech Offers DC-DC Controller For Step-Down, Step-Up, Inverting & SEPIC Topologies

Linear Technology Corp. announced a new (MP) grade version of the LT3724, a 60V (65V_(MAX)) low quiescent current (100µA) switching regulator dc-dc controller used in step-down, step-up, inverting and SEPIC topologies.

The LT3724MP operates, and is 100% tested, over a junction temperature range of -55 to 125°C, compared to the "I" grade version’s -40 to 125°C operating temperature range. A power supply incorporating the LT3724 can convert a 4 to 60V input supply to a regulated output ranging from 1.23 to 36V in applications such as industrial, 12 and 42V automotive, heavy equipment, avionics and telecom power systems.

The LT3724 has a powerful 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%. Additional features include precision undervoltage lockout, 10µA shutdown current, programmable soft-start to control the turn-on time, a ±1.3% 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 $5.94 each for 1,000 piece quantities.