NOTICE - The following device(s) are recommended alternatives:

The ISL6420A 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 ISL6420A 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 ISL6420A 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 ISL6420A 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 rDS(ON) of the upper MOSFET to inhibit the PWM operation appropriately. This approach simplifies the implementation and improves efficiency by eliminating the need for a current sensing resistor.

Features

  • Operates From:
  • 4.5V to 5.5V Input
  • 5.5V to 28V Input
  • 0.6V Internal Reference Voltage
  • ±1.0% Reference Accuracy
  • Resistor-Selectable Switching Frequency
  • 100kHz to 1.4MHz
  • Voltage Margining and External Reference Tracking Modes
  • Output can Sink or Source Current
  • Lossless, Programmable Overcurrent Protection
  • Uses Upper MOSFET's rDS(ON)
  • Programmable Soft-Start
  • Drives N-Channel MOSFETs
  • Simple Single-Loop Control Design
  • Voltage-Mode PWM Control
  • Fast Transient Response
  • High-Bandwidth Error Amplifier
  • Full 0% to 100% Duty Cycle
  • Extensive Circuit Protection Functions
  • PGOOD, Overvoltage, Overcurrent, Shutdown
  • Diode Emulation during Startup for Pre-Biased Load Applications
  • Offered in 20 Ld QFN and QSOP Packages
  • QFN (4x4) Package
  • 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

  • Power Supplies for Microprocessors/ASICs Embedded Controllers DSP and Core Processors DDR SDRAM Bus Termination
  • Ethernet Routers and Switchers
  • High-Power DC/DC Regulators
  • Distributed DC/DC Power Architecture
  • Personal Computer Peripherals
  • Externally Referenced Buck Converters

Product Options

Part Number Part Status Pkg. Type Carrier Type MOQ Buy Sample
Active QFN Tube 75
Availability
Active QFN Reel 1000
Availability

Documentation

Title language Type Format File Size Date
Datasheets & Errata
ISL6420A Datasheet 简体中文 Datasheet PDF 1.14 MB
User Guides & Manuals
ISL6420AEVALxZ User Guide Manual PDF 2.23 MB
Application Notes & White Papers
AN1681: Grounding Techniques Application Note PDF 509 KB
AN1684: Nonideality of Ground Application Note PDF 397 KB
Five Easy Steps to Create a Multi-Load Power Solution White Paper PDF 846 KB
PCNs & PDNs
PCN15046 - Wafer Fabrication Site Change for Listed Intersil Products - Global Foundry P6 Process transfer to Palm Bay - Phase II Product Change Notice PDF 398 KB
PCN13025 - Alternate Bond Wire Material and Manufacturing Facilities for Assembly of the Listed Intersil DFN/QFN Packaged Products - Advanced Semiconductor Engineering (ASECL) - Chung-Li , Taiwan and STATS ChipPAC (SCM) - Kuala Lumpur, Mal Product Change Notice PDF 106 KB
PCN13009 - Alternate Bond Wire Material and Manufacturing Facilities for Assembly of the Listed Intersil DFN/QFN Packaged Products - Advanced Semiconductor Engineering (ASECL) - Chung-Li (ASECL), Taiwan and STATS ChipPAC (SCM) - Kuala Lump Product Change Notice PDF 173 KB
PCN10055 - Alternate Bond Wire Material for Assembly of the Listed Intersil DFN/QFN Packaged Products - STATS ChipPAC Malaysia Product Change Notice PDF 248 KB
Other
PLC14051A - Product Discontinuance / Obsolescence Notification Product Life Cycle Notice PDF 124 KB
ISL6420A iSim:PE Model Schematic SXSCH 276 KB

Software & Tool Pages

Title Type Description Company
iSim:PE Offline Simulation Tool Simulator iSim Personal Edition (iSim:PE) speeds the design cycle and reduces risk early in any project, identifying parts that can be used in current as well as next-generation designs. Renesas

Boards & Kits

Part Number Title Type Company
ISL6420AEVAL1Z Advanced Single Synchronous Buck Pulse Width Modulation (PWM) Controller Evaluation Board Evaluation Renesas
ISL6420AEVAL3Z Advanced Single Synchronous Buck Pulse Width Modulation (PWM) Controller Evaluation Board Evaluation Renesas