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Polyphase synchronous boost controller eliminates heat sink with 97 percent efficiency

September 28, 2010 | Paul Buckley | 222901526
Polyphase synchronous boost controller eliminates heat sink with 97 percent efficiency Linear Technology Corporation has unveiled a high power two phase single output synchronous step-up DC/DC controller that replaces the boost diodes with high efficiency N-channel MOSFETs. The LTC3787 eliminates the heat sink normally required in medium to high power boost converters.
The device can produce a 24 V at 10 A output from a 12 V input at up to 97% efficiency. The LTC3787's 135 uA standby quiescent current when configured for Burst Mode operation makes it ideal for high power 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 operates from an input voltage ranging from 4.5 V to 38 V during start-up, maintains operation down to 2.5 V after start-up and can regulate an output voltage as high as 60 V. The powerful 1.2 Ohm onboard N-channel MOSFET gate drivers are capable of slewing large MOSFET gates quickly. The device's current mode architecture, clock output and phase modulation enables easy paralleling of multiple devices for up to 12 phase operation.

The LTC3787 has a phase-lockable frequency from 75 kHz to 850 kHz or a selectable fixed frequency from 50 kHz to 900 kHz. In applications where the input voltage exceeds the regulated output voltage, the LTC3787 keeps the synchronous MOSFET on continuously so that the output voltage follows the input voltage with minimal power loss. In addition, this device features adjustable cycle-by-cycle current limit and can use a sense resistor or monitor the voltage drop across the inductor (DCR) for current sensing.  The LTC3787 also has adjustable soft-start, a power good output and maintains +1% reference voltage accuracy over an operating junction temperature range of-40 to 125 degrees C.

Availability and Pricing

The LTC3787 is available in SSOP-28 and 4 mm x 5mm QFN-28 packages. The 1,000-piece price starts at 4.12 US Dollars each.

More information about the LTC3787 two phase single output synchronous step-up DC/DC controller at www.linear.com/3787

Visit Linear Technology at www.linear.com









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