W83321G Nuvoton Technology Corporation of America, W83321G Datasheet - Page 4

• Manufacturer Part Number: W83321G
• Description: IC BUCK SYNC ADJ 8SOIC
• Manufacturer: Nuvoton Technology Corporation of America
• Type: Step-Down (Buck)r

Specifications of W83321G

• Internal Switch(s): No
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 0.8 ~ 5 V
• Frequency - Switching: 250kHz
• Voltage - Input: 5V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Power - Output: -

1. GENERAL DESCRIPTION
The W83321S is a high-speed, N-Channel synchronous buck regulator controller. The W83321S
employs fixed-frequency voltage-mode PWM control architecture. Both high-side and low-side
MOSFETs are lower cost N-Channel type. 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 a local charge pump.
Current limit is achieved by monitoring the voltage drop across the on resistance of the low-side
MOSFET. This method eliminates the requirement of extra current sensing resistor and avoids false
trigger of OC protection when V
avoid potential shoot-through problems while maintaining high efficiency.
2. FEATURES
- 0.8V Internal Reference
- ±1.5% Over Line Voltage and Temperature
- Voltage-Mode PWM Control
- Uses Lower MOSFET’s Rds (on)
- Current limit without sense resistor
- 250 kHz Fixed Frequency Oscillator
- Internal Soft Start
- Tiny plastic SOP-8 package
Operates from +5V Input
0.8V to VIN Output Range
Drives N-Channel MOSFETs
Simple Single-Loop Control Design
Fast Transient Response
Lossless, Programmable Overcurrent Protection
Small Converter Size
IN
varies. The adaptive non-overlapping MOSFET gate drivers help
- 4 -
W83321S/W83321G