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24-V Triple Output Synchronous Step-Down Controller

24-V Triple Output Synchronous Step-Down Controller

Linear Technology Corp. has introduced H- and MP-grade versions of the LTC3853, a triple output synchronous step-down switching regulator controller. This device operates over a 4.5 V to 24 V input voltage range, can produce output currents up to 20 A per phase with output voltages ranging from 0.8 V to 13.5 V at up to 95% efficiency. These H- and MP-grade versions are guaranteed over operating junction temperatures from -40 °C to 150 °C and -55 °C to 150 °C, respectively.

The LTC3853 has powerful 1.1 Ohm on-chip MOSFET gate drivers. A constant-frequency current mode architecture allows a selectable fixed or synchronized frequency from 250 kHz to 750 kHz. Power loss and supply noise are minimized by operating the three stages 120° out-of-phase. Output current sensing is accomplished by measuring the voltage drop across the output inductor (DCR) or by using an optional sense resistor. Current foldback limits MOSFET heat dissipation during short-circuit and overload conditions. In addition, the LTC3853 has adjustable soft-start or tracking. Selectable Burst Mode® operation, pulse skipping or continuous inductor current modes are user controlled to optimize light load efficiency.

The LTC3853 features a precision 0.8V reference with an accuracy of ±1.25% over a -55 °C to 150 °C operating temperature range. With up to 98% duty cycle, the LTC3853 has a very low dropout voltage, a useful feature for extending run times in battery-powered applications. The LTC3853 is available in a thermally enhanced 6mm x 6mm QFN-40 package. Pricing for 1,000-piece quantities begins at $4.24 each.

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