ISL6420B Intersil Corporation, ISL6420B Datasheet

ISL6420B

Manufacturer Part Number

ISL6420B

Description

Advanced Single Synchronous Buck Pulse-Width Modulation (PWM) Controller

Manufacturer

Intersil Corporation

Datasheet

1.ISL6420B.pdf (20 pages)

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

ISL6420BIRZ

Manufacturer:

Intersil

Quantity:

110

Current page: 1 of 20
Download datasheet (578Kb)

www.DataSheet4U.com

Advanced Single Synchronous Buck

Pulse-Width Modulation (PWM) Controller

The ISL6420B simplifies the implementation of a complete

control and protection scheme for a high-performance

DC/DC buck converter. It is designed to drive N-channel

MOSFETs in a synchronous rectified buck topology, the

ISL6420B integrates control, output adjustment, monitoring

and protection functions into a single package. Additionally,

the IC features an external reference voltage tracking mode

for externally referenced buck converter applications and

DDR termination supplies, as well as a voltage margining

mode for system testing in networking DC/DC converter

applications.

The ISL6420B provides simple, single feedback loop,

voltage mode control with fast transient response. The

output voltage of the converter can be precisely regulated to

as low as 0.6V.

The operating frequency is fully adjustable from 100kHz to

1.4MHz. High frequency operation offers cost and space

savings.

The error amplifier features a 15MHz gain-bandwidth

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

bandwidth for fast transient response. The PWM duty cycle

ranges from 0% to 100% in transient conditions. Selecting

the capacitor value from the ENSS pin to ground sets a fully

adjustable PWM soft-start. Pulling the ENSS pin LOW

disables the controller.

The ISL6420B monitors the output voltage and generates a

PGOOD (power good) signal when soft-start sequence is

complete and the output is within regulation. A built-in

overvoltage protection circuit prevents the output voltage

from going above typically 115% of the set point. Protection

from overcurrent conditions is provided by monitoring the

appropriately. This approach simplifies the implementation

and improves efficiency by eliminating the need for a current

sensing resistor.

DS(ON)

of the upper MOSFET to inhibit the PWM operation

Data Sheet

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

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

Features

• Operates From:

• 0.6V Internal Reference Voltage

• Resistor-Selectable Switching Frequency

• Voltage Margining and External Reference Tracking

• Output Can Sink or Source Current

• Lossless, Programmable Overcurrent Protection

• Programmable Soft-Start

• Drives N-Channel MOSFETs

• Simple Single-Loop Control Design

• Fast Transient Response

• Extensive Circuit Protection Functions

• Diode Emulation during Startup for Pre-Biased Load

• Offered in 20 Ld QFN and QSOP Packages

• QFN (4x4) Package

• Pb-Free (RoHS Compliant)

Applications

• Power Supplies for Microprocessors/ASICs

• Ethernet Routers and Switchers

• High-Power DC/DC Regulators

• Distributed DC/DC Power Architecture

• Personal Computer Peripherals

• Externally Referenced Buck Converters

- 4.5V to 5.5V Input

- 5.5V to 28V Input

- ±2.0% Reference Accuracy

- 100kHz to 1.4MHz

Modes

- Uses Upper MOSFET’s r

- Voltage-Mode PWM Control

- High-Bandwidth Error Amplifier

- Full 0% to 100% Duty Cycle

- PGOOD, Overvoltage, Overcurrent, Shutdown

Applications

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

- QFN Near Chip Scale Package Footprint; Improves

- Embedded Controllers

- DSP and Core Processors

- DDR SDRAM Bus Termination

Flat No Leads - Product Outline

PCB Efficiency, Thinner in Profile

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

April 27, 2009

Intersil (and design) is a registered trademark of Intersil Americas Inc.

DS(ON)

ISL6420B

FN6901.0

Related parts for ISL6420B

Related keywords

ISL6420B datasheet
ISL6420B data sheet
ISL6420B pdf datasheet
ISL6420B component
ISL6420B part
ISL6420B distributor
ISL6420B RoHS
ISL6420B datasheet download