W83320S Datasheet, PDF (4/18 Pages) Winbond – N-Channel FET Synchronous Buck Regulator Controller

W83320S/W83320G
1. GENERAL DESCRIPTION
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 V_IN 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.
2. FEATURES
y 1.8V to 5V power stage input voltage
y Providing +/-1.5% reference voltage
y Power Good flag
y Current limit without sense resistor
y Soft start
y Switching frequency from 100 kHz to 400 kHz
y Tiny plastic SOP-14 package
3. APPLICATIONS
y DDR SDRAM and AGP core power for Desktop PC
y Set-Top Boxes/ Home Gateways
y Core Logic Regulators
y High-Efficiency Buck Regulation
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