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ISL65426

6A Dual Synchronous Buck Regulator with Integrated MOSFETs

Renesas Electronics 

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ISL65426

6A Dual Synchronous Buck Regulator with Integrated MOSFETs

FN6340

Rev 3.00

March 25, 2008

The ISL65426 is a high efficiency dual output monolithic

synchronous buck converter operating over an input

voltage range of 3V to 5.5V. This single chip power solution

provides two output voltages, which are selectable or

externally adjustable from 1V to 80% of the supply voltage

while delivering up to 6A of total output current. The two

PWMs are synchronized 180° out-of-phase, reducing the

RMS input current and ripple voltage.

The ISL65426 switches at a fixed frequency of 1MHz and

utilizes current-mode control with integrated compensation

to minimize the size and number of external components

and provide excellent transient response. The internal

synchronous power switches are optimized for good

thermal performance and high efficiency.

A unique power block architecture allows partitioning of six

1A blocks to support one of four configuration options. One

master power block is associated with each synchronous

converter channel. Four floating slave power blocks allow

the user to assign them to either channel. Proper external

configuration of the power blocks is verified internally prior

to soft-start initialization.

Independent enable inputs allow for synchronization or

sequencing soft-start intervals of the two converter

channels. A third enable input allows additional sequencing

for multi-input bias supply designs. Individual power-good

indicators (PG1, PG2) signal when output voltage is within

the regulation window.

The ISL65426 integrates protection for both synchronous

buck regulator channels. The fault conditions include

overcurrent, undervoltage, and IC thermal monitor.

High integration contained in a thin Quad Flat No-lead

(QFN) package makes the ISL65426 an ideal choice to

power many of today’s small form factor applications. A

single chip solution for large scale digital ICs, like field

programmable gate arrays (FPGA), requiring separate core

and I/O voltages.

Features

• High Efficiency: Up to 95%

• Fixed Frequency: 1MHz

• Operates From 3V to 5.5V Supply

• ±1% Reference

• Flexible Output Voltage Options

- Programmable 2-Bit VID Input

- Adjustable Output From 1V to 4.0V

• User-Partitioned Power Blocks

• Ultra-Compact DC/DC Converter Design

• PWMs Synchronized 180° Out-of-Phase

• Independent Enable Inputs and System Enable

• Stable All Ceramic Solutions

• Excellent Dynamic Response

• Independent Output Digital Soft-Start

• Power-Good Output Voltage Monitor

• Thermal-Overload Protection

• Overcurrent and Undervoltage Protection

• Pb-Free (RoHS Compliant)

Applications

• FPGA, CPLD, DSP, and CPU Core and I/O Voltages

- Xilinx Spartan IIITM, Virtex IITM, Virtex II ProTM,

Virtex 4TM

- Altera StratixTM, Stratix IITM, CycloneTM, Cyclone IITM

- Actel FusionTM, LatticeSCTM, LatticeECTM

• Low-Voltage, High-Density Distributed Power Systems

• Point-of-Load Regulation

• Distributed Power Systems

• Set-Top Boxes

Ordering Information

PART

NUMBER

(Note)

PART

MARKING

TEMP.

RANGE

(°C)

PACKAGE PKG.

(Pb-free) DWG. #

ISL65426HRZ* ISL65426 HRZ -10 to +100 50 Ld 5x10 QFN L50.5x10

ISL65426IRZA* ISL65426 IRZ -40 to +85 50 Ld 5x10 QFN L50.5x10

*Add “-T” suffix for tape and reel. Please refer to TB347 for details on

reel specifications.

NOTE: These Intersil Pb-free plastic packaged products employ

special Pb-free material sets; molding compounds/die attach materials

and 100% matte tin plate PLUS ANNEAL - e3 termination finish, which

is 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.

FN6340 Rev 3.00

March 25, 2008

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