Linear Technology Corporation has introduced the LTC3852, a synchronous step-down DC/DC controller designed for both narrow and wide input voltage ranges—ranging from 2.7V to 5.5V or 4V to 38V. This versatile device features an integrated charge pump that provides a 5V bias voltage, allowing it to drive low RDS(on) and standard logic-level power MOSFETs from a nominal 3.3V supply. The charge pump and the DC/DC controller operate independently, meaning the charge pump can supply 5V to the internal gate driver while the DC/DC converter draws power from another source, as high as 38V.
The LTC3852 is capable of delivering up to 25A of output current across a wide output voltage range, from 0.8V up to 99% of the input voltage (2.7V to 5.5V). This makes it an excellent choice for point-of-load applications powered by 3.3V systems. Its constant-frequency current-mode architecture supports optional fixed or phase-lockable (PLL) frequencies ranging from 250kHz to 750kHz. Users can also choose between Burst Mode operation, pulse skipping, or forced continuous mode to optimize efficiency under light load conditions.
Featuring OPTI-LOOP® compensation, the LTC3852 ensures optimal transient response across a broad range of output capacitors and ESR values, including all ceramic input and output capacitors. For current sensing, the device can either measure the voltage drop across the output inductor (DCR) for maximum efficiency or use an optional sense resistor for higher accuracy. A current foldback feature helps reduce MOSFET heating during short-circuit or overload conditions.
The LTC3852 also includes adjustable soft-start or tracking options to control power-on behavior, along with an accurate 0.8V reference that maintains ±1.25% accuracy over a wide temperature range (-40°C to 125°C). With a maximum duty cycle of 99%, the controller offers a very low dropout voltage, making it ideal for battery-powered applications where extending run time is critical.
The LTC3852 is available in a thermally enhanced 3mm x 5mm QFN-24 package. It is priced at $1.95 per unit for 1,000-piece orders and is available from stock. For more details, visit the official website.
Photo Caption: Low Voltage Synchronous Step-Down DC/DC Controller
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