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概览

描述

The ISL8024A is a highly efficient, monolithic, synchronous step-down DC/DC converter that can deliver 4A 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 ISL8024 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 ISL8024 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 ISL8024 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 device 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.

特性

  • 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 (8023/24), 2MHz (8023A/24A)
  • External synchronization up to 4MHz
  • Over-temperature, overcurrent, overvoltage, and negative overcurrent protection
  • Tiny 3mm x 3mm QFN package

产品对比

应用

  • 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

文档

设计和开发

软件与工具

软件与工具

Software title
Software type
公司
iSim:PE 离线模拟工具
iSim Personal Edition(iSim:PE )可加快设计周期并降低项目早期风险,确定可用于当前和下一代设计的部件。
Simulator 瑞萨电子
1 item

开发板与套件

模型

ECAD 模块

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