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Monolithic 2.5-MHz step-down DC/DC converter withstands 80-V transients

April 20, 2012 // Paul Buckley

Monolithic 2.5-MHz step-down DC/DC converter withstands 80-V transients

Linear Technology Corporation has released a 60 V IN step-down switching regulator that can deliver dual 1 A outputs. The LT3988 operates within a V IN range of 4 V to 60 V, with overvoltage lockout protection against transients of 80 V.

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 1.3 A switches deliver up to 1 A of continuous output current. Switching frequency is user-programmable from 250 kHz to 2.5 MHz, 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 1.3 A 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 250 kHz to 2.5 MHz), internal loop compensation, thermal shutdown and tracking capability.

More information about the LT3988 at

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