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Step-down regulators' input voltage ranges from 3.4-40V

Posted: 25 May 2007 ?? ?Print Version ?Bookmark and Share

Keywords:step-down switching regulator? wide input voltage range? harsh setups?

Linear Technology Corp. announces the LT3502/A, a 500mA Iout, 40V step-down switching regulator packaged in a 2-by-2mm DFN.

LT3502/A's 3.4-40V input voltage range makes it suitable for harsh environment & automotive load dump and cold-crank conditions. The device can deliver up to 500mA of continuous output current to voltages as low as 0.8V. Switching frequency is either 1.1MHz (standard version) or 2.2MHz ("A" version), enabling the user to optimize efficiency while avoiding critical noise-sensitive frequency bands. The combination of its 2-by-2mm DFN-8 package and high switching frequency keeps the external capacitors and inductor small, providing a very compact, thermally efficient footprint.

LT3502/A uses a high efficiency 900mA, 300mVcesat switch, with the necessary boost diode, oscillator, control and logic circuitry integrated on-chip. Special design techniques enable high efficiency over a wide input voltage range and the LT3502/A's current mode topology enables fast transient response and excellent loop stability. Other features include internal compensation, soft-start and short circuit protection.

LT3502EDC and LT3502AEDC are both available in a 2-by-2mm DFN 8 package from stock. They are both priced starting at $1.95 each for 1,000-piece quantities. LT3502IDC and LT3502AIDC operate from a -40C to 125C operating junction temperature. Both devices are priced at $2.34 in 1,000-piece quantities and are available from stock.

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