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ISL6549
Single 12V Input Supply Dual Regulator —
Synchronous Rectified Buck PWM and
Linear Power 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.
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.
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.
The ISL6549 is available in a 14 Ld SOIC package,
16 Ld QSOP, or 16 Ld 4x4 QFN packages.
Related Literature
• Technical Brief TB363 Guidelines for Handling and
Processing Moisture Sensitive Surface Mount Devices
(SMDs)
Features
• Single 12V bias supply (no 5V supply is required)
• Provides two regulated voltages
- One synchronous rectified buck PWM controller
- One linear controller
• 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
• 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
• Undervoltage fault monitoring on both outputs
• Pb-free plus anneal available (RoHS compliant)
Applications
•
Processor and memory supplies
• ASIC power supplies
• Embedded processor and I/O supplies
• DSP supplies
Ordering Information
PART NUMBER PART MARKING TEMP. RANGE (°C) PACKAGE PKG. DWG. #
ISL6549CB ISL6549CB 0 to 70 14 Ld SOIC M14.15
ISL6549CBZ (Note) 6549CBZ 0 to 70 14 Ld SOIC (Pb-free) M14.15
ISL6549CR ISL6549CR 0 to 70 16 Ld 4x4 QFN L16.4x4
ISL6549CRZ (Note) 6549CRZ 0 to 70 16 Ld 4x4 QFN (Pb-free) L16.4x4
ISL6549CA ISL6549CA 0 to 70 16 Ld QSOP M16.15A
ISL6549CAZ (Note) 6549CAZ 0 to 70 16 Ld QSOP (Pb-free) M16.15A
ISL6549CAZA (Note) 6549CAZ 0 to 70 16 Ld QSOP (Pb-free) M16.15A
ISL6549IBZ (Note) 6549IBZ -40 to 85 14 Ld SOIC (Pb-free) M14.15
ISL6549IRZ (Note) 6549IRZ -40 to 85 16 Ld 4x4 QFN (Pb-free) L16.4x4
ISL6549IAZ (Note) 6549IAZ -40 to 85 16 Ld QSOP (Pb-free) M16.15A
ISL6549LOW-EVAL1 Evaluation Board 1-5A
ISL6549HI-EVAL1 Evaluation Board up to 20A
Add “-T” suffix for tape and reel.
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.
Data Sheet September 22, 2006 FN9168.2
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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