Intersil ISL8013A 3A低静态电流1MHz高效同步降压稳压器参考方案

Intersil公司的ISL8013A是一款高效率，单片同步降压型DC-DC转换器，可提供高达3A的连续输出电流从2.8V至5.5V的输入电源。它采用了电流控制架构，以提供非常低的占空比工作在高频率快速瞬态响应和卓越的环路稳定性。ISL8013A集成了一对低导通电阻的P沟道和N-通道内部MOSFET，以最大限度地提高效率和减少外部元件数量。100％占空比工作，允许小于300mV压差电压，输出电流为3A。ISL8013AEVAL2Z是基于ISL8013A芯片开发设计的参考方案。ISL8013AEVAL2Z开发套件应用于单负载点的设备，设备电压应用范围为2.7V-5.5V。ISL8013AEVAL2Z评估开发板主要用于展示ISL8013A低静态电流模式下的转换性能。本文主要介绍ISL8013A芯片简介、主要特性、应用及其内部框图。对于ISL8013AEVAL2Z参考方案，主要介绍参考方案的主要特性、原理图、元器件清单及其PCB Layout图。
The ISL8013A is a high efficiency, monolithic,synchronous step-down DC/DC converter that can deliver up to 3A continuous output current from a 2.8V to 5.5V input supply. It uses a current control architecture to deliver very low duty cycle operation at high frequency with fast transient response and excellent loop stability.
The ISL8013A integrates a pair of low ON-resistance P-Channel and N-Channel internal MOSFETs to maximize efficiency and minimize external component count. The 100% duty-cycle operation allows less than 300mV dropout voltage at 3A output current. High 1MHz pulse-width modulation (PWM) switching frequency allows the use of small external components and SYNC input enables multiple ICs to synchronize out of phase to reduce ripple and eliminate beat frequencies.
The ISL8013A 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.
Fault protection is provided by internal hiccup mode current limiting during short circuit and overcurrent conditions, an output over voltage comparator and over-temperature monitor circuit. A power good output voltage monitor indicates ...