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ISL6520A

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Single Synchronous Buck Pulse-Width Modulation (PWM) controller

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ISL6520A Datasheet

Overview

The ISL6520A makes simple work out of implementing a complete control and protection scheme for a DC/DC stepdown converter. Designed to drive N-Channel MOSFETs in a synchronous buck topology, the ISL6520A integrates the control, output adjustment, monitoring and protection functions into a single 8 Lead package. The ISL6520A 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, with a maximum tolerance of ±1. 5% over-temperature and line voltage variations. A fixed frequency oscillator reduces design complexity, while balancing typical application cost and efficiency. The error amplifier features a 15MHz gain-bandwidth product and 8V/ms slew rate which enables high converter bandwidth for fast transient performance. The resulting PWM duty cycles range from 0% to 100%. 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.

ISL6520A Functional Diagram
ISL6520A Functional Diagram
  • Operates from +5V Input
  • 0.8V to VIN Output Range
  • 0.8V Internal Reference
  • ±1.5% Over Line Voltage and Temperature
  • 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
  • Lossless, Programmable Overcurrent Protection
  • Uses Upper MOSFET's rDS(ON)
  • Small Converter Size
  • 300kHz Fixed Frequency Oscillator
  • Internal Soft-Start
  • 8 Ld SOIC or 16 Ld 4mm x 4mm QFN
  • QFN Package:
  • Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat No Leads - Package Outline
  • Near Chip Scale Package footprint, which improves PCB efficiency and has a thinner profile
  • Pb-Free (RoHS Compliant)
  • Power Supplies for Microprocessors PCs Embedded Controllers
  • Subsystem Power Supplies PCI/AGP/GTL+ Buses ACPI Power Control SSTL-2 and DDR SDRAM Bus Termination Supply
  • Cable Modems, Set Top Boxes, and DSL Modems
  • DSP and Core Communications Processor Supplies
  • Memory Supplies
  • Personal Computer Peripherals
  • Industrial Power Supplies
  • 5V-Input DC/DC Regulators
  • Low-Voltage Distributed Power Supplies

Documentation

Featured Documentation
Type Title Date
Datasheet
ISL6520A Datasheet
PDF 665 KB
End Of Life Notice
PLC17019 - Q2 Cy 17 General PLC Notice
PDF 320 KB
Product Change Notice
PCN13013 - Test Site Change for the Listed Intersil Products - Carsem (CAS) Ipoh Malaysia
PDF 207 KB
Product Change Notice
PCN12085 - 8l, 14l, 16l SOIC w/ Gold Bond Wire @ ATP as Alternate Assembly Site
PDF 152 KB
Application Note
AN1681: Grounding Techniques
PDF 509 KB
Application Note
AN1684: Nonideality of Ground
PDF 397 KB
Other
TB417: Designing Stable Compensation Networks for Single Phase Voltage Mode Buck Regulators
PDF 562 KB
7 items

Design & Development

ISL6520EVAL1 Evaluation Board Layout

ISL6520EVAL1

Evaluation
Learn More

Single Synchronous Buck Pulse Width Modulation (PWM) Controller Evaluation Board

The ISL6520EVAL1 evaluation board highlights the operation of the ISL6520A synchronous buck PWM controller in an embedded application.

The evaluation board is...

Featured Documents:
ISL6520EVAL1 User Guide

ECAD Models

Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.

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