ISL6529

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: !à1% over temperature - ISL6529A
-Both outputs: !à2% overtemperature - 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)




Application

Graphics-CGPU and memory supplie
ASIC power supplies
Embedded processor and I/O supplies
DSP supplies




Pinout






Specifications

UGATE, LGATE, DRIVE2,. . . . . . . . . . . . . . . GND - 0.3V to 12VCC
5VCC. . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . .GND - 0.3V to +7V
12VCC. . . . . . . . . . . . . . . . . . . . . . . . . .. . . .GND - 0.3V to +14V
FB, FB2, COMP, . . . . . . . . . . . . . .. . . GND - 0.3V to 5VCC + 0.3V
ESD Classification. . . . . . . . . . . . . . . . . . . . . . . . . . . . Class 4kV




Description

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. The synchronous rectified buck converters incorporate simple, single feedback loop, voltage-mode control with fast transient response. Both the switching regulator and linear regulator provide a maximum static regulation tolerance of ±2% over line, load, and temperature ranges. Each output is user-adjustable by means of external resistors. An integrated soft-start feature brings both supplies into regulation in a controlled manner. Each output is monitored via the FB pins for undervoltage events. If either output drops below 51.5% of the nominal output level, both converters are shut down.