ISL6549
®
Data Sheet
September 22, 2006
FN9168.2
Single 12V Input Supply Dual Regulator —
Synchronous Rectified Buck PWM and
Linear Power Controller
Features
• Single 12V bias supply (no 5V supply is required)
• Provides two regulated voltages
- One synchronous rectified buck PWM controller
- One linear controller
The ISL6549 provides the power control and protection for
two output voltages in high-performance applications. The
dual-output controller drives two N-Channel MOSFETs in a
synchronous rectified buck converter topology and one
N-Channel MOSFET in a linear configuration. The controller is
ideal for applications where regulation of both the processing
unit and memory supplies is required.
• Both controllers drive low cost N-Channel MOSFETs
• Small converter size
- Adjustable frequency 150kHz to 1MHz
- Small external component count
• Excellent output voltage regulation
- Both outputs: ±1% over temperature
The synchronous rectified buck converter incorporates
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
±1% over line, load, and temperature ranges. Each output is
user-adjustable by means of external resistors.
• 12V 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
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 75% of the nominal output level, both converters are
shut off and go into retry mode.
• Undervoltage fault monitoring on both outputs
• Pb-free plus anneal available (RoHS compliant)
Applications
The ISL6549 is available in a 14 Ld SOIC package,
16 Ld QSOP, or 16 Ld 4x4 QFN packages.
•
Processor and memory supplies
• ASIC power supplies
Related Literature
• Technical Brief TB363 Guidelines for Handling and
Processing Moisture Sensitive Surface Mount Devices
(SMDs)
• Embedded processor and I/O supplies
• DSP supplies
Ordering Information
PART NUMBER
PART MARKING
ISL6549CB
TEMP. RANGE (°C)
PACKAGE
PKG. DWG. #
M14.15
ISL6549CB
0 to 70
0 to 70
14 Ld SOIC
ISL6549CBZ (Note)
ISL6549CR
6549CBZ
14 Ld SOIC (Pb-free)
16 Ld 4x4 QFN
M14.15
ISL6549CR
6549CRZ
0 to 70
L16.4x4
L16.4x4
M16.15A
M16.15A
M16.15A
M14.15
ISL6549CRZ (Note)
ISL6549CA
0 to 70
16 Ld 4x4 QFN (Pb-free)
16 Ld QSOP
ISL6549CA
6549CAZ
0 to 70
ISL6549CAZ (Note)
ISL6549CAZA (Note)
ISL6549IBZ (Note)
ISL6549IRZ (Note)
ISL6549IAZ (Note)
ISL6549LOW-EVAL1
ISL6549HI-EVAL1
Add “-T” suffix for tape and reel.
0 to 70
16 Ld QSOP (Pb-free)
16 Ld QSOP (Pb-free)
14 Ld SOIC (Pb-free)
16 Ld 4x4 QFN (Pb-free)
16 Ld QSOP (Pb-free)
6549CAZ
0 to 70
6549IBZ
-40 to 85
-40 to 85
-40 to 85
6549IRZ
L16.4x4
M16.15A
6549IAZ
Evaluation Board 1-5A
Evaluation Board up to 20A
NOTE: Intersil Pb-free plus anneal 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.
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2004, 2006. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
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