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W83321S

Features: Operates from +5V Input 0.8V to VIN Output Range- 0.8V Internal Reference- ±1.5% Over Line Voltage and Temperature􀁹 Drives N-Channel MOSFETs􀁹 Simple Single-Loop Control Design- Voltage-Mode PWM ControlFast Transient Response Lossless, Programmable Overcurrent Protectio...

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SeekIC No. : 004545166 Detail

W83321S: Features: Operates from +5V Input 0.8V to VIN Output Range- 0.8V Internal Reference- ±1.5% Over Line Voltage and Temperature􀁹 Drives N-Channel MOSFETs􀁹 Simple Single-Loop Control ...

W83321S Data Sheet

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Part Number:
W83321S
Supply Ability:
5000

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  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2024/11/20

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Product Details

Description



Features:

Operates from +5V Input
0.8V to VIN Output Range
- 0.8V Internal Reference
- ±1.5% Over Line Voltage and Temperature
􀁹 Drives N-Channel MOSFETs
􀁹 Simple Single-Loop Control Design
- Voltage-Mode PWM Control
Fast Transient Response
Lossless, Programmable Overcurrent Protection
- Uses Lower MOSFET's Rds (on)
- Current limit without sense resistor
Small Converter Size
- 250 kHz Fixed Frequency Oscillator
- Internal Soft Start
- Tiny plastic SOP-8 package


Application

Motherboard Power Supplies Regulation
Subsystem Power Supplies
- PCI/AGP/GTL+ Buses
- ACPI Power Control
- SSTL-2 and DDR SDRAM Bus Termination Supply
Cable Modems, Set Top Boxes, and DSL Modems
DSP and Core Communications Processor Supplies
Memory Power Supplies
Personal Computer Peripherals
Industrial Power Supplies
5V-Input DC-DC Regulators
Low-Voltage Distributed Power Supplies


Pinout

Connection Diagram


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 VIN varies. The adaptive non-overlapping MOSFET gate drivers help avoid potential shoot-through problems while maintaining high efficiency.




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