Monday, October 29, 2007

Linear Tech Adds 36V, 2A, 2.2MHz Step-Down DC-DC Converter In 3 x 3mm DFN

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Linear Technology announced the LT3500, a 2A, 36V step-down switching regulator and a linear controller in a 3 x 3mm DFN package. The LT3500 operates from a VIN range of 3 to 36V (40VMAX ), making it suitable 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 optimize 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, is said to provide a very compact, thermally efficient footprint.

The LT3500's main switcher utilizes a 2.3A, 450mVCESAT switch, with the necessary oscillator, control, logic circuitry and LDO controller integrated into a single die. Special design techniques are said to enable high efficiency over a wide input voltage range while its current mode topology are claimed to enable fast transient response and excellent loop stability. Other features include a power good flag and soft-start capability.

The LT3500EDD pricing starts at $3.25 each for 1,000-piece quantities. The LT3500IDD is tested and guaranteed to operate from a -40 to 125°C operating junction temperature and is priced at $3.90 each. The LT3500HDD is tested and guaranteed to operate from a -40 to 150°C operating junction temperature and is priced at $4.15 each. All versions are available from stock.

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