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The W83320S is a high-speed, N-Channel synchronous buck regulator controller optimized for wide reference input range. The W83320S employs adjustable frequency ranging from 100 KHz to 400 KHz voltage-mode PWM control architecture. The regulator is biased from a 5V rail and the power for the high-side MOSFET can be supplied by a separate 12V rail or supplied from the internal charge pump.
A Current limit protection is implemented by monitoring the voltage drop across the switch ON resistance of the low-side MOSFET. This method can eliminate the requirement of extra current sensing resistor and avoids false trigger of OC protection when VIN varies efficiently. The adaptive non-overlapping MOSFET gate drivers help avoid potential shoot-through problems while maintaining high efficiency. All these together with Power-good flag, enable and soft start features make power sequencing easy.
W83320G Features
·1.8V to 5V power stage input voltage ·Providing +/-1.5% reference voltage ·Power Good flag ·Current limit without sense resistor ·Soft start ·Switching frequency from 100 kHz to 400 kHz ·Tiny plastic SOP-14 package
W83320G Typical Application
· DDR SDRAM and AGP core power for Desktop PC · Set-Top Boxes/ Home Gateways · Core Logic Regulators · High-Efficiency Buck Regulation