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DC/DC converter resists 80V transients

Posted: 26 Apr 2012 ?? ?Print Version ?Bookmark and Share

Keywords:DC/DC converter? switching regulator? automotive?

Linear Technology Corp. has unveiled a 60VIN step-down switching regulator that can deliver dual 1A outputs. The LT3988 operates within a VIN range of 4-60V, with overvoltage lockout protection against transients as high as 80V. According to the company, the device is ideal for load dump and cold-crank conditions commonly found in automotive applications.

The LT3988 can be driven by two separate input rails or by a single input, maximizing design flexibility. Its internal switches deliver up to 1A of continuous output current. Switching frequency is user-programmable from 250kHz to 2.5MHz, enabling the designer to maximize efficiency, while avoiding critical noise-sensitive frequency bands. The combination of its thermally enhanced MSOP-16E package and high switching frequency, which keeps the external inductor and capacitors small, provides a compact, thermally efficient footprint, described Linear Tech.


The LT3988 is a 2.5MHz step-down DC/DC converter.

The LT3988 uses dual, high efficiency 1.3A switches, with the necessary boost diodes, oscillator, control and logic circuitry integrated into a single chip. Its catch diode current sense (DA) pins protect the circuit during input voltage transients even at high switching frequencies while adding robust short-circuit protection. Anti-phase switching minimizes both input and output ripple. Special design techniques used in the LT3988 enable high efficiency over a wide input voltage range, and the device's current mode topology enables fast transient response and excellent loop stability. Other features include external synchronization, internal loop compensation, thermal shutdown and tracking capability.

Pricing for the LT3988EMSE starts at $3.65 each. An industrial temperature grade version, the LT3988IMSE, is tested and guaranteed to operate from -40C to 125C operating junction temperature and is priced at $4.20 each. A high temperature version, the LT3988HMSE, is tested and guaranteed to operate from -40C to 150C operating junction temperature and is priced at $4.45 each. All prices are for 1,000-piece quantities and all versions are available from stock.

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