Dual Regulator–Synchronous Rectified Buck PWM and Linear Power Controllers

The ISL6529, ISL6529A provide the power control and protection for two output voltages in high-performance graphics cards and other embedded processor applications. The dual-output controllers drive two N-Channel MOSFETs in a synchronous rectified buck converter topology and one N-Channel MOSFET in a linear configuration. The ISL6529, ISL6529A provide both a regulated high current, low voltage supply and an independent, lower current supply integrated in a 14-lead SOIC package. The controllers are ideal for graphic card applications where regulation of both the graphics processing unit (GPU) and memory supplies is required.

Features
• Provides two regulated voltages
    - One synchronous rectified buck PWM controller
    - One linear controller
• Both controllers drive low cost N-Channel MOSFETs
• 12V direct drive saves external components
• Small converter size
    - 600kHz constant frequency operation
    - Small external component count
• Excellent output voltage regulation
    - Both outputs: ±1% over temperature - ISL6529AC
    - Both outputs: ±2% over temperature - ISL6529C
• 5V down conversion
• PWM and linear output voltage range: down to 0.8V
• Simple single-loop voltage-mode PWM control design
• Fast PWM converter transient response
    - High-bandwidth error amplifier
    - Full 0-100% duty ratio
• Linear controller drives N-Channel MOSFET pass transistor
• Fully-adjustable outputs
• Undervoltage fault monitoring on both outputs
• QFN Package:
    - Compliant to JEDEC PUB95 MO-220
        QFN - Quad Flat No Leads - Package Outline
    - Near Chip Scale Package footprint, which improves
        PCB efficiency and has a thinner profile
• Pb-Free Available (RoHS Compliant)

Applications
• Graphics–GPU and memory supplies
• ASIC power supplies
• Embedded processor and I/O supplies
• DSP supplies