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Linear – Dual 60V / 1A monolithic 2.5MHz step-down DC-DC converter takes 80V transients (LT3988IMSE)

Apr 22 2012 - Power [More Power Articles]

A new 60VIN step-down switching regulator that can deliver dual 1A outputs, the LT3988 has been unveiled by Linear Technology.

The device operates within a VIN range of 4V to 60V, with over-voltage lockout protection against transients as high as 80V, making it 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 1.3A 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.

The LT3988 utilizes 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 (from 250kHz to 2.5MHz), internal loop compensation, thermal shutdown and tracking capability.

An industrial temperature grade version, the LT3988IMSE, is tested and ‘guaranteed’ to operate from -40C to 125C operating junction temperature. A high-temperature version, the LT3988HMSE, is tested and ‘guaranteed’ to operate from -40C to 150C operating junction temperature, says the company.

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