概要

The ISL8023A is a highly efficient, monolithic, synchronous step-down DC/DC converter that can deliver 3A of continuous output current from a 2.7V to 5.5V input supply. The device uses current mode control architecture to deliver very low-duty cycle operation at high frequency with fast transient response and excellent loop stability. It has an adjustable frequency from 500kHz to 4MHz with the default at 2MHz (ISL8023A/24A).

The ISL8023 integrates a very low ON-resistance P-Channel (45mΩ) high-side FET and N-Channel (19mΩ) low-side FET to maximize efficiency and minimize external component count. The 100% duty-cycle operation allows less than 200mV dropout voltage at 4A output current. The operation frequency of the pulse-width modulator (PWM) is adjustable from 500kHz to 4MHz. The default switching frequency of 1MHz is set by connecting the FS pin high, which allows for the use of small external components.

The ISL8023 can be configured for discontinuous or forced continuous operation at light load. Forced continuous operation reduces noise and RF interference while discontinuous mode provides higher efficiency by reducing switching losses at light loads.

Fault protection is provided by internal hiccup mode current limiting during short circuit and overcurrent conditions. Other protection, such as overvoltage and over-temperature are also integrated into the device. A power-good output voltage monitor indicates when the output is in regulation.

The ISL8023 offers a 1ms power-good (PG) timer at power-up. When in shutdown, the device discharges the output capacitor through an internal soft-stop switch. Other features include internal fixed or adjustable soft-start and internal/external compensation. The ISL8023 is offered in a space-saving 16 Ld 3mm x 3mm Pb-free QFN package with an exposed pad for improved thermal performance and 1mm maximum height. The complete converter occupies less than 0.22 in² area.

Various fixed output voltages are available upon request. See the datasheet for more details.

ISL8023_ISL8024 Functional Diagram
ISL8023_ISL8024 Functional Diagram
  • 2.7V to 5.5V input voltage range
  • Very low ON-resistance FETs - P-Channel 45mΩ and N-Channel 19mΩ typical values
  • High-efficiency synchronous buck regulator with up to 95% efficiency
  • 0.8% reference accuracy over temperature/load/line
  • Complete BOM with as few as 3 external parts
  • Start-up with pre-biased output
  • Internal soft-start - 1ms or adjustable
  • Soft-stop output discharge during disabled
  • Adjustable frequency from 500kHz to 4MHz - Default at 1MHz (8023), 2MHz (8023A)
  • External synchronization up to 4MHz
  • Over-temperature, overcurrent, overvoltage, and negative overcurrent protection
  • Tiny 3mm x 3mm QFN package

アプリケーション

  • DC/DC POL modules
  • μC/µP, FPGA and DSP power
  • Plug-in DC/DC modules for routers and switchers
  • Portable instruments
  • Test and measurement systems
  • Li-ion battery-powered devices

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ISL802xEVAL3Z,ISL802xAEVAL3Z Synchronous Buck Regulator Eval Board

ISL8023AEVAL3Z

Evaluation
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ISL8023A Compact Synchronous Buck Regulator Evaluation Board

The ISL8023AEVAL3Z kit is intended for use by individuals with requirements for point-of-load (POL) applications sourcing from 2.7V to 5.5V. This simple smallest factor...

主要ドキュメント:
ISL8023, ISL8023A, ISL8024, ISL8024A Datasheet

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