Linear Technology has announced the LTC3787, a two phase single output synchronous step-up DC/DC controller that replaces the boost diodes with more efficient N-channel MOSFETs. This solution eliminates the heat sink normally required.
The LTC3787 can produce a 24V at 10A output from a 12V input at up to 97% efficiency. It operates from an input voltage ranging from 4.5V to 38V during start-up, maintains operation down to 2.5V after start-up and can regulate an output voltage as high as 60V. The device’s current mode architecture, clock output and phase modulation enables paralleling of multiple devices for up to 12 phase operation.
Multiphase operation reduces input and output capacitor requirements and allows the use of smaller inductors than the single-phase equivalent. Synchronous rectification increases efficiency, reduces power losses and eases thermal requirements, enabling high power boost application.
The LTC3787 has a phase-lockable frequency from 75kHz to 850kHz or a selectable fixed frequency from 50kHz to 900kHz. According to Linear the part maintains ±1% reference voltage accuracy over an operating junction temperature range of -40°C to 125°C.
Target applications include automotive audio amplifiers, as well as industrial and medical applications where a step-up DC/DC converter must deliver high power in a small solution size.
The LTC3787 is available in SSOP-28 and 4mm x 5mm QFN-28 packages. The 1,000-piece price starts at $4.12 each.