FN9073 Rev 9.00

Page 1 of 18

Oct 21, 2015

FN9073

Rev 9.00

Oct 21, 2015

ISL6406

Single Synchronous Buck Pulse-Width Modulation (PWM) Controller

DATASHEET

The ISL6406 is an adjustable frequency, synchronous buck

switching regulator optimized for generating lower voltages

for the distributed DC/DC architectures. The ISL6406 offers

an adjustable output voltage.

Designed to drive N-Channel MOSFETs in synchronous

buck topology, the ISL6406 integrates the control, output

adjustment and protection functions into a single package.

The ISL6406 provides simple, single feedback loop,

voltage-mode control with fast transient response. The

output voltage can be precisely regulated to as low as 0.8V.

The error amplifier features a 15MHz gain-bandwidth

product and 6V/µs slew rate which enables high converter

bandwidth for fast transient performance.

Protection from overcurrent conditions is provided by

monitoring the rDS(ON) of the upper MOSFET to inhibit PWM

operation appropriately. This approach simplifies the

implementation and improves efficiency by eliminating the

need for a current sense resistor.

The wide programmable switching frequency range of

100kHz to 700kHz allows the use of small surface mount

inductors and capacitors. The device also provides external

frequency synchronization making it an ideal choice for

DC/DC converter applications.

Features

• Operates from 3.3V/5V Input

• 0.8V to VIN Output Range

- 0.8V Internal Reference

- ±1.5% Reference Accuracy

• Simple Single-Loop Control Design

- Voltage-Mode PWM Control

• Fast Transient Response

- High-Bandwidth Error Amplifier

• Lossless, Programmable Overcurrent Protection

- Uses Upper MOSFET’s rDS(ON)

• Programmable Switching Frequency 100kHz to 700kHz

• External Frequency Synchronization

• Internal Soft-Start

• QFN Package Option

- QFN Compliant to JEDEC PUB95 MO-220 QFN - Quad

Flat No Leads - Product Outline

- QFN Near Chip-Scale Package Footprint; Improves

PCB Efficiency, Thinner in Profile

• Pb-Free (RoHS compliant)

Applications

• 3V/5V DC/DC Converter Modules

• Distributed DC/DC 3.3V, 2.5V and 1.8V Power

Architectures for DSP, Logic, and Memory

• Power Supplies for Microprocessors

-PCs

- Embedded Controllers

• Memory Supplies

• Personal Computer Peripherals

Ordering Information

PART NUMBER

(Note)

PART MARKING

TEMP. RANGE (°C)

PACKAGE

(RoHS Compliant)

PKG. DWG. #

ISL6406IBZ* (No longer available,

recommended replacement: ISL6406IVZ)

6406IBZ

-40 to +85

16 Ld SOIC

M16.15

ISL6406IRZ* (No longer available or

supported)

ISL6406 IRZ

-40 to +85

16 Ld 5x5 QFN

L16.5x5B

ISL6406IVZ*

6406 IVZ

-40 to +85

16 Ld TSSOP

M16.173

*Add “-T” suffix to part number for tape and reel packaging. 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.