1

®

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.

1-888-INTERSIL or 1-888-468-3774

Copyright © Intersil Americas Inc. 2004, 2006. All Rights Reserved

All other trademarks mentioned are the property of their respective owners.