ISL6524A
®
Data Sheet
April 8, 2005
FN9064.1
VRM8.5 PWM and Triple Linear Power
System Controller
Features
• Provides 4 Regulated Voltages
- Microprocessor Core, AGTL+ Bus, AGP Bus Power,
and North/South Bridge Core
• Drives N-Channel MOSFETs
• Linear Regulator Drives Compatible with both MOSFET
and Bipolar Series Pass Transistors
• Simple Single-Loop Control Design
- Voltage-Mode PWM Control
• Fast PWM Converter Transient Response
- High-Bandwidth Error Amplifier
- Full 0% to 100% Duty Ratio
The ISL6524A provides the power control and protection for
four output voltages in high-performance microprocessor and
computer applications. The IC integrates one PWM controller
and three linear controllers, as well as the monitoring and
protection functions into a 28-pin SOIC package. The PWM
controller regulates the microprocessor core voltage with a
synchronous-rectified buck converter. One linear controller
supplies the computer system’s AGTL+ 1.2V bus power. The
other two linear controllers regulate power for the 1.5V AGP
bus and the 1.8V power for the chipset core voltage and/or
cache memory circuits.
• Excellent Output Voltage Regulation
- Core PWM Output: ±1% Over Temperature
- All Other Outputs: ±3% Over Temperature
• VRM8.5 TTL-Compatible 5-Bit DAC Microprocessor Core
Output Voltage Selection
- Wide Range - 1.050V to 1.825V
• Power-Good Output Voltage Monitors
- Separate delayed VTT Power Good
The ISL6524A includes an Intel VRM8.5 compatible, TTL
5-input digital-to-analog converter (DAC) that adjusts the
microprocessor core-targeted PWM output voltage from
1.050V to 1.825V in 25mV steps. The precision reference and
voltage-mode control provide ±1% static regulation. The linear
regulators use external N-channel MOSFETs or bipolar NPN
pass transistors to provide fixed output voltages of 1.2V ±3%
(V
), 1.5V ±3% (V
) and 1.8V ±3% (V ).
OUT2
OUT3
OUT4
The ISL6524A monitors all the output voltages. A delayed-
rising VTT (V output) Power Good signal is issued
• Over-Voltage and Over-Current Fault Monitors
- Switching Regulator Doesn’t Require Extra Current
OUT2
before the core PWM starts to ramp up. Another system
Power Good signal is issued when the core is within ±10% of
the DAC setting and all other outputs are above their under-
voltage levels. Additional built-in over-voltage protection for
the core output uses the lower MOSFET to prevent output
voltages above 115% of the DAC setting. The PWM
Sensing Element, Uses MOSFET’s r
DS(ON)
• Small Converter Size
- Constant Frequency Operation
- 200kHz Internal Oscillator
• Pb-Free Available (RoHS Compliant)
controllers’ over-current function monitors the output current
by using the voltage drop across the upper MOSFET’s
DS(ON)
Applications
r
, eliminating the need for a current sensing resistor.
•
Motherboard Power Regulation for Computers
Pinout
Ordering Information
ISL6524A (SOIC) TOP VIEW
TEMP.
PKG.
DWG.
#
DRIVE2
1
2
3
4
5
6
7
8
9
28 VCC
RANGE
PART NUMBER
ISL6524ACB*
ISL6524ACBZ* (Note)
ISL6524ACBZA-T (Note) 0 to 70 28 Ld SOIC (Pb-free) M28.3
ISL6524EVAL1 Evaluation Board
(°C)
PACKAGE
FIX
VID3
27 UGATE
26 PHASE
25 LGATE
24 PGND
23 OCSET
22 VSEN1
21 FB
0 to 70 28 Ld SOIC
M28.3
VID2
0 to 70 28 Ld SOIC (Pb-free) M28.3
VID1
VID0
VID25
PGOOD
VTTPG
*Add “-T” suffix for tape and reel.
20 COMP
19 VSEN3
18 DRIVE3
17 GND
FAULT/RT 10
VSEN2 11
SS24 12
NOTE: Intersil Pb-free products employ special Pb-free material sets;
molding compounds/die attach materials and 100% matte tin plate
termination finish, which are RoHS compliant and compatible with
both SnPb and Pb-free soldering operations. Intersil Pb-free products
are MSL classified at Pb-free peak reflow temperatures that meet or
exceed the Pb-free requirements of IPC/JEDEC J STD-020.
SS13 13
16 VAUX
15 DRIVE4
VSEN4 14
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1
1-888-INTERSIL or 1-888-352-6832 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2002, 2005. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
5秒后页面跳转
解析光耦仿真器：升级光耦合器技术的必要性
英伟达新一代Blackwell GPU过热问题致交付延迟
国产厂商思特威CMOS图像传感器芯片单月出货超1亿颗，技术创新引领行业发展
台积电5nm和3nm产能利用率达100%，半导体行业景气度持续攀升
微信公众号
抖音公众号
浙公网安备 33010502006866号 浙ICP备10014259号-119
营业执照ICP证
数据手册
如果您发现信息不准确，
