Step-down regulator handles automotive extremes

The LT3500 runs from an input voltage range of 3 to 36V (40V maximum), making it ideal for load dump and cold-crank conditions found in automotive applications.

The LT3500 from Linear Technology is a 2A, 36V step-down switching regulator and linear controller in a 3 x 3mm DFN package.

The LT3500 runs from an input voltage range of 3 to 36V (40V maximum), making it ideal for load dump and cold-crank conditions found in automotive applications.

Its 2.3A internal switch can deliver up to 2A of continuous output current at voltages as low as 0.8V.

Switching frequency is user programmable from 250kHz to 2.2MHz, enabling the designer to optimise efficiency while avoiding critical noise-sensitive frequency bands.

The integrated LDO controller, combined with an NPN transistor, ensures very low noise output from the primary channel or as a second channel.

The LT3500's 3 x 3mm DFN-10 package and high switching frequency, which keeps external capacitors and inductor small, provide a very compact, thermally efficient footprint.

The LT3500's main switcher uses a high efficiency 2.3A, 450mV switch, with the necessary oscillator, control, logic circuitry and LDO controller integrated into a single die.

Special design techniques enable high efficiency over a wide input voltage range, and the current-mode topology enables fast transient response and excellent loop stability.

Other features include a power good flag and soft-start capability.

The LT3500EDD pricing starts at US $3.25 each for 1000-piece quantities.

The LT3500IDD is tested and guaranteed to operate from a -40 to +125C operating junction temperature and is priced at US $3.90 each.

The LT3500HDD is tested and guaranteed to operate from a -40 to +150C operating junction temperature and is priced at US $4.15 each.

All versions are available from stock.

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