Overview

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The ISL6269 IC is a Single-Phase Synchronous-Buck PWM controller featuring Intersil's Robust Ripple Regulator (R3) technology that delivers truly superior dynamic response to input voltage and output load transients. Integrated MOSFET drivers, 5V LDO and bootstrap diode result in fewer components and smaller implementation area. Intersil's R3 technology combines the best features of fixed-frequency PWM and hysteretic PWM while eliminating many of their shortcomings. R3 technology employs an innovative modulator that synthesizes an AC ripple voltage signal VR, analogous to the output inductor ripple current. The AC signal VR enters a window comparator where the lower threshold is the error amplifier output VCOMP, and the upper threshold is a programmable voltage reference VW, resulting in generation of the PWM signal. The voltage reference VW sets the steady state PWM frequency. Both edges of the PWM can be modulated in response to input voltage transients and output load transients, much faster than conventional fixed frequency PWM controllers. Unlike a conventional hysteretic converter, the ISL6269 has an error amplifier that provides ±1% voltage regulation at the FB pin. The ISL6269 has a 1. 5ms digital soft-start and can be started into a pre-biased output voltage. A resistor divider is used to program the output voltage setpoint. The ISL6269 can be configured to operate in continuous-conduction-mode (CCM) or diode-emulation-mode (DEM), which improves light-load efficiency. In CCM the controller always operates as a synchronous rectifier however, when DEM is enabled the low-side MOSFET is permitted to stay off, blocking negative current flow into the low-side MOSFET from the output inductor.

ISL6269 Functional Diagram
ISL6269 Functional Diagram
  • High performance R3 technology
  • Fast transient response
  • +0.6V Internal Reference
  • ±0.6% tolerance over the commercial temperature range (0°C to +70°C)
  • ±1.0% tolerance over the industrial temperature range (-40°C to +85°C)
  • Wide input voltage range: +7.0V to +25.0V
  • Output voltage range: +0.6V to +3.3V
  • Wide output load range: 0A to 25A
  • Selectable diode emulation mode for increased light load efficiency
  • Programmable PWM frequency: 200kHz to 600kHz
  • Pre-biased output start-up capability
  • Internal 5V LDO for self-biasing
  • Integrated MOSFET drivers and bootstrap diode
  • Internal digital soft-start
  • Power good monitor
  • PWM minimum frequency above audible spectrum
  • Fault protection
  • Undervoltage protection
  • Soft crowbar overvoltage protection
  • Low-side MOSFET rDS(ON) overcurrent protection
  • Over-temperature protection
  • Fault identification by PGOOD pull-down resistance
  • Pb-free (RoHS compliant)

Applications

  • PCI express graphical processing unit
  • Auxiliary power rail
  • VRM
  • Network adapter

Documentation

= Featured Documentation
Type Title Date
Datasheet
ISL6269 Datasheet
PDF 717 KB
End Of Life Notice
PLC15033 - Product Discontinuance / Obsolescence NotificationProducts
PDF 200 KB
Product Change Notice
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
PDF 106 KB
Product Change Notice
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
PDF 173 KB
Manual - Development Tools
ISL6269EVAL2Z Evaluation Board Manual
PDF 859 KB
Application Note
AN1681: Grounding Techniques
PDF 509 KB
Application Note
AN1684: Nonideality of Ground
PDF 397 KB
Other
TB459: Using the ISL6269, ISL6269A for 5V VOUT Applications
PDF 303 KB
8 items

Design & Development

ECAD Models

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Product Options

    Processing table
    Pkg. Type
    Carrier Type
    MOQ
    Buy / Sample
    Part Number
    ISL6269IRZ
    circleObsolete
    memory
    view_in_ar
    		QFN Tube 750
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