パワーマネジメント

概要

The ISL6526, ISL6526A make 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 ISL6526, ISL6526A integrate the control, output adjustment, monitoring and protection functions into a single package. The ISL6526, ISL6526A provide 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 6V/µs 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.

ISL6526_ISL6526A Functional Diagram
ISL6526_ISL6526A Functional Diagram
  • Operates from 3.3V to 5V Input
  • 0.8V to VIN Output Range
  • 0.8V Internal Reference
  • ±1.5% Over Load, 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)
  • Converter can Source and Sink Current
  • Small Converter Size
  • Internal Fixed Frequency Oscillator
  • ISL6526: 300kHz
  • ISL6526A: 600kHz
  • Internal Soft-Start
  • 14 Ld SOIC or 16 Ld 5x5 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)

アプリケーション

  • Power Supplies for Microprocessors
  • PCs
  • Embedded Controllers
  • Subsystem Power Supplies
  • PCI/AGP/GTL+ Buses
  • ACPI Power Control
  • 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
  • 33V-Input DC/DC Regulators
  • Low-Voltage Distributed Power Supplies

ドキュメント

タイトル 分類 日付
ISL6526, ISL6526A Datasheet
PDF865 KB
データシート
AN1681: Grounding Techniques
PDF509 KB
アプリケーションノート
AN1684: Nonideality of Ground
PDF397 KB
アプリケーションノート
AN1021: Embedded DC-DC Converters Using ISL6526 and ISL6527 PWM Controller ICs
PDF839 KB
アプリケーションノート
TB417: Designing Stable Compensation Networks for Single Phase Voltage Mode Buck Regulators
PDF562 KB
その他資料

設計・開発

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モデル

Title Type Date
ISL6526A iSim:PE Model
SXSCH102 KB
モデル－iSim

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