H-grade regulator suits automotive applications

Linear Technology has launched the H-grade version of the LT3972 3.5A, 33V step-down switching regulator that is said to be ideal for automotive applications.

The LT3972 is a 3.5A step-down switching regulator with burst mode operation to keep quiescent current under 75uA.

It operates within a VIN range of 3.6V to 33V, with overvoltage lockout protection against transients as high as 62V, making it ideal for load-dump and cold-crank conditions found in automotive applications.

Its internal 4.6A switch can deliver up to 3.5A of continuous output current to voltages as low as 0.79V.

The LT3972's burst mode operation offers ultra-low quiescent current well suited for applications such as automotive or telecom systems, which demand always-on operation and optimum battery life.

Switching frequency is user-programmable from 200kHz to 2.4MHz, enabling the designer to optimise efficiency while avoiding critical noise-sensitivity frequency bands.

The combination of its thermally enhanced MSOP-10E package and high switching frequency, which keeps external inductors and capacitors small, provides a compact, thermally efficient footprint.

The H-grade version operates up to a junction temperature of 150C, compared with the 125C maximum junction temperature of the E- and I-grade versions.

All electrical specifications are identical for the E-, I- and H-grade versions.

H-grade parts are tested and guaranteed to a maximum junction temperature of 150C and are ideal for automotive and industrial applications that are subjected to high ambient temperatures.

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