ISL8018

8A Low Quiescent Current High Efficiency Synchronous Buck Regulator

OVERVIEW

The ISL8018 is a high efficiency, monolithic, synchronous step-down DC/DC converter that can deliver up to 8A continuous output current from a 2.7V to 5.5V input supply. The output voltage is adjustable from 0.6V to VIN . With an adjustable current limit, reverse current protection, prebias start and over-temperature protection, the ISL8018 offers a highly robust power solution. It uses current control architecture to deliver fast transient response and excellent loop stability.

The ISL8018 integrates a pair of low ON-resistance P-channel and N-channel internal MOSFETs to maximize efficiency and minimize external component count. 100% duty-cycle operation allows less than 250mV dropout at 8A output current. Adjustable frequency and synchronization allow the ISL8018 to be used in applications requiring low noise.

The ISL8018 can be configured for discontinuous or forced continuous operation at light load. Forced continuous operation reduces noise and RF interference while discontinuous mode provides high efficiency by reducing switching losses at light loads.

The ISL8018 is offered in a space saving 20 Ld 3x4 QFN lead free package with exposed pad lead frames for excellent thermal performance. The complete converter occupies less than 96.8mm2 area.

KEY FEATURES

  • High efficiency synchronous buck regulator with up to 97% efficiency
  • ±10% output voltage margining
  • Adjustable current limit
  • Start-up with prebiased output
  • Internal soft-start - 1ms or adjustable, internal/external compensation
  • Soft-stop output discharge during disabled
  • Adjustable frequency from 500kHz to 4MHz - default at 1MHz
  • External synchronization up to 4MHz - master to slave phase shifting capability
  • Peak current limiting, hiccup mode short-circuit protection and over-temperature protection

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL8018
Basic Information
生产状态
Mass Production
iSim模型
YES
拓扑
Buck
输出数量
1
输入电压最小值 (V)
2.7
输入电压最大值 (V)
5.5
输出电压最小值 (V)
0.6
输出电压最大值 (V)
5.5
输出电流最大值 (A)
8
IQ
70 µA
开关频率 (最大值) (MHz)
4
开关频率 (最小值) (MHz)
0.5
最大占空比 (%)
100
资质级别
Standard
峰值效率 (%)
97
POR
Yes
BOM总占用面积 (mm2)
96.8
SYNCH功能
Yes
控制类型
Current Mode
开关频率范围 (MHz)
0.5 to 4
CAN 采样
YES
温度范围
-40 to +85

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