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Small step-down DC/DC converter rolls for cars

Posted: 11 Oct 2007 ?? ?Print Version ?Bookmark and Share

Keywords:step-down switching regulator? automotive application? DC/DC converter?

A step-down switching regulator ideal for automotive applications was announced by Linear Technology Corp. The LT3693, a 3.5A, 36V step-down DC/DC converter operates within a VIN range of 3.6V to 36V, making it ideal for both load dump and cold-crank conditions, such as found in automotive applications. Its 4.6A internal switch can deliver up to 3.5A of continuous output current at voltages as low as 0.79V. The regulator utilizes a high-efficiency 4.6A, 95m? switch which can deliver up to 90 percent efficiency. The switching frequency is user programmable from 200kHz to 2.4MHz, enabling the designer to optimize efficiency while avoiding critical noise-sensitive frequency bands while keeping externals small. It is packaged in either a 3mm x 3mm DFN or MSOP-10E. The combination of high switching frequency and tiny package ensure a very compact solution footprint.

The necessary boost diode, oscillator, control and logic circuitry are integrated into a single chip. Special design techniques used in the LT3693 enable high efficiency over a wide input voltage range, and its current mode topology enables fast transient response and excellent loop stability. Other features include external synchronization, a power good flag and soft-start capability. The LT3693IDD and LT3693IMSE are tested and guaranteed to operate from a -40-125C operating junction temperature.

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