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ISL6529, ISL6529A
Data Sheet
April 12, 2005
FN9070.5
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.
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.
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)
Ordering Information
PART NUMBER*
ISL6529ACB
ISL6529ACBZ (Note)
ISL6529ACR
ISL6529ACRZ (Note)
ISL6529CB
ISL6529CBZ (Note)
ISL6529CR
ISL6529CRZ (Note)
ISL6529EVAL1
TEMP.
RANGE (°C)
0 to 70
0 to 70
0 to 70
0 to 70
0 to 70
0 to 70
0 to 70
0 to 70
PACKAGE
14 Ld SOIC
PKG.
DWG. #
M14.15
14 Ld SOIC (Pb-free) M14.15
16 Ld 5x5 QFN
16 Ld 5x5 QFN
(Pb-free)
14 Ld SOIC
L16.5x5B
L16.5x5B
M14.15
Applications
• Graphics–GPU and memory supplies
• ASIC power supplies
• Embedded processor and I/O supplies
• DSP supplies
14 Ld SOIC (Pb-free) M14.15
16 Ld 5x5 QFN
16 Ld 5x5 QFN
(Pb-free)
L16.5x5B
L16.5x5B
Related Literature
• Technical Brief TB363
Guidelines for Handling and
Processing Moisture Sensitive Surface Mount Devices
(SMDs)
Evaluation Board
*Add
“-T” suffix for tape and reel.
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.
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
|
Intersil (and design) is a 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.
ISL6529, ISL6529A
Pinouts
ISL6529, ISL6529A (SOIC)
TOP VIEW
LGATE 1
PGND 2
GND 3
5VCC 4
DRIVE2 5
FB2 6
NC 7
14 UGATE
13 12VCC
12 NC
11 NC
10 COMP
9 FB
8 NC
PGND
GND
5VCC
DRIVE2
NC = NO INTERNAL CONNECTION
5
FB2
6
NC
7
NC
8
NC
1
2
3
4
12
11
10
9
12VCC
NC
COMP
FB
ISL6529, ISL6529A (QFN)
TOP VIEW
UGATE
14
LGATE
NC
16
15
13
NC = NO INTERNAL CONNECTION
2
NC
FN9070.5
April 12, 2005
Block Diagram
5VCC
0.80V
0.41V
1.28V
3
VOLTAGE
REFERENCE
POWER-ON
RESET (POR)
ISL6529, ISL6529A
SHUTDOWN
FB2
12VCC
SOFT-
START
AND FAULT
LOGIC
RESTART
12VCC
+5V
DRIVE2
UGATE
EA2
INHIBIT
SOFT-START
+5VCC
EA1
COMP1
OSCILLATOR
PGND
LGATE
PWM
INHIBIT
SOFT-START
GATE
LOGIC
GND
UV1
UV2
FB
COMP
FN9070.5
April 12, 2005
ISL6529, ISL6529A
Simplified Power System Diagram
+V
IN
+12V
+5V
Q1
Q3
V
OUT2
+
LINEAR
CONTROLLER
V
OUT1
PWM
CONTROLLER
Q2
+
ISL6529
ISL6529A
Typical Application
+V
IN
(+5V or +3.3V)
+12V
+5V
C
BP
5VCC
C
BP
12VCC
C
IN
Q3
V
OUT2
2.5V
+
FB2
DRIVE2
+
UGATE
Q1
L
OUT
PHASE
V
OUT1
1.5V
+
C
OUT2
ISL6529
ISL6529A
LGATE
Q2
C
OUT1
FB
COMP
GND
PGND
4
FN9070.5
April 12, 2005
微控制器 MCU
