NCT3933U

The NCT3933U includes three adjustable current DACs that are each capable of sinking and sourcing current through SMBus interface. Each output has 128 sinking and sourcing settings that are programmed by the SMBus interface. The output current also can be programmable for twofold sinking/sourcing increase respectively. The NCT3933U features step speed controlled function which can easily interfacing with general DC/DC converter for voltage adjustment. The NCT3933U also provides power saving function to reduce 60% power consumption when system enters standby mode. The NCT3933U is available in SOT23-8 package.

Applications

• Power Supply Adjustment for M/B and Graphic Card
• Power Supply Margining
• Adjustable Current Sink or Source
• LCD Brightness and Contrast Adjustment

Key features

• 3-Channel Current DAC
• Programmable 128 Steps Sinking and Sourcing Current
• Full Scale Current 0 to ± 1270uA
• Programmable for Twofold Output Current
• 5% Output Accuracy
• Interface: SMBus Serial Interface
• SMBus 2.0 Compatible Interface
• Address Select Pin Allows Six Devices on Same SMBus
• 3V to 5.5V Operating Range
• Power Saving Function
• Watchdog Timer
• Programmable Step Speed Control
• Low External Component Count
• Low Cost and Easy to Use
• -20°C to 125°C Temperature Range
• SOT23-8 Green Package (Lead Free and Halogen Free)