ISL6526A: Single Synchronous Buck Pulse-Width Modulation (PWM) Controller

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.

Key Features
  • 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)
Applications
  • 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
  • 3.3V-Input DC/DC Regulators
  • Low-Voltage Distributed Power Supplies
Typical Diagram
Application Notes
TitleTypeUpdatedSizeOther Languages
AN1243: Getting Started with iSim and iSim:PEPDF28 Aug 2015228 KB
AN1652: iSim:PE Users GuidePDF13 Nov 20141.45 MB
AN1021: Embedded DC-DC Converters Using ISL6526 and ISL6527 PWM Controller ICsPDF13 Nov 2014944 KB
Datasheets
TitleTypeUpdatedSizeOther Languages
ISL6526, ISL6526A DatasheetPDF19 Jan 2017442 KB
Tech Briefs
TitleTypeUpdatedSizeOther Languages
TB417: Designing Stable Compensation Networks for Single Phase Voltage Mode Buck RegulatorsPDF19 Nov 2014206 KB
White Papers
TitleTypeUpdatedSizeOther Languages
Five Easy Steps to Create a Multi-Load Power SolutionPDF30 Jan 2017502 KB
Order Information
Part NumberPackage TypeWeight(g)PinsMSL RatingPeak Temp (°C)RoHS Status
ISL6526ACB14 Ld SOIC0.1314240
ISL6526ACB-T14 Ld SOIC T+R0.1314240
ISL6526ACBZ14 Ld SOIC0.13143260RoHS
ISL6526ACBZ-T14 Ld SOIC T+R0.13143260RoHS
ISL6526ACR16 Ld QFN0.06816240
ISL6526ACR-T16 Ld QFN T+R0.06816240
ISL6526ACRZ16 Ld QFN0.068163260RoHS
ISL6526ACRZ-T16 Ld QFN T+R0.068163260RoHS
ISL6526AIB14 Ld SOIC0.1314240
ISL6526AIB-T14 Ld SOIC T+R0.1314240
ISL6526AIBZ14 Ld SOIC0.13143260RoHS
ISL6526AIBZ-T14 Ld SOIC T+R0.13143260RoHS
ISL6526AIR16 Ld QFN0.06816240
ISL6526AIR-T16 Ld QFN T+R0.06816240
ISL6526AIRZ16 Ld QFN0.068163260RoHS
ISL6526AIRZ-T16 Ld QFN T+R0.068163260RoHS
ISL6526AIRZ-TK16 Ld QFN T+R0.068163260RoHS
ISL6526AEVAL1N/A
ISL6526AEVAL2N/A
Datasheet
ISL6526, ISL6526A Datasheet 19 Jan 2017
Other
AN1021: Embedded DC-DC Converters Using ISL6526 and ISL6527 PWM Controller ICs 13 Nov 2014
AN1243: Getting Started with iSim and iSim:PE 28 Aug 2015
AN1652: iSim:PE Users Guide 13 Nov 2014
16 Ld QFN T+R ISL6526
14 Ld SOIC HI-303
Five Easy Steps to Create a Multi-Load Power Solution 30 Jan 2017
TB417: Designing Stable Compensation Networks for Single Phase Voltage Mode Buck Regulators 19 Nov 2014