LINEAR TECHNOLOGY DC725A Evaluation Board, 7A Phase Lockable Constant Frequency PolyPhase Monolithic Regulator
The demonstration board is a 7A high efficiency, phase lockable constant frequency buck converter incorporating LTC3415EUHF polyphase monolithic synchronous regulator. The LTC3415EUHF is a high efficiency, monolithic synchronous buck regulator using a phase lockable constant frequency, current mode architecture. The DC725 has an input voltage range of 2.375V to 5.5V and an output voltage range from 0.6V to 5V. The reference voltage of 0.6V is +/-1% accurate, producing a more precise output voltage. The operating frequency range of the DC725 is either set by the LTC3415 internal oscillator to 1.5MHz, set to 1MHz or 2MHz by forcing the PLLPF pin to ground or VIN, respectively or synchronized to an external clock, with a range between 750KHz and 2.25MHz. The DC725 can deliver high power for a monolithic part up to 7A of output current due to the high current power switches 28mohm of onstate resistance of the LTC3415.
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- Nominal switching frequency of 1.5MHz
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- Spread spectrum frequency modulation
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- Output tracking and margining
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- ±1% reference accuracy
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- Selectable burst mode operation
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- Low dropout operation, 100% duty cycle
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- Low quiescent current of 450µA
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- Current mode operation for excellent line and load transient response
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- Shutdown mode draws only 0.2µA supply current