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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