Linear Technology Corporation (Linear Technology Corporation) introduced single-phase power output of two synchronous boost DC / DC controller LTC3787, the device with high efficiency boost diode substituted N-channel MOSFET. This solution removes the heat sink typically required in medium to high power boost converters. The LTC3787 is capable of producing 24V/10A output from a 12V input with up to 97% efficiency. When configured for Burst Mode? operation, the LTC3787 's 135uA standby quiescent current makes the device ideal for high-power automotive audio amplifiers, as well as industrial and medical applications. In this type of application, step-up DC/DC The converter must provide high power in a small solution size.
The LTC3787 operates from an input voltage range of 4.5V to 38V at startup, keeps operation as low as 2.5V after startup, and can regulate output voltages up to 60V. The powerful 1.2Ω internal N-channel MOSFET gate driver quickly converts large MOSFET gates. The device's current mode architecture, clock output, and phase modulation make it easy to parallel multiple devices for 12-phase operation. The LTC3787 has a phase-lockable frequency from 75kHz to 850kHz or an optional fixed frequency from 50kHz to 900kHz. In applications where the input voltage exceeds the regulated output voltage, the LTC3787 keeps the synchronous MOSFET continuously turned on so that the output voltage follows the input voltage with the lowest power dissipation. In addition, the device features an adjustable cycle-by-cycle current limit and current sensing with a sense resistor or a voltage drop across the monitor inductor (DCR). In addition, the LTC3787 features adjustable soft-start and power-good outputs with ±1% reference accuracy over the operating junction temperature range of -40°C to 125°C.
The LTC3787 is available in SSOP-28 and 4mm x 5mm QFN-28 packages. The 1,000-piece purchase price is $4.12 per piece. For more information, please visit
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