Maxim MAX8655宽输入25A降压电源稳压方案
Maxim 公司的MAX8655 是集成功率MOSFET的宽输入25A降压电源稳压器,输入电压4.5V到25V,输出电压可在0.7V-5.5V间调整,负载电流高达25A,开关频率在200kHz到1MHz, 主要应用在POL电源,通信电源,网络通信,非隔离DC/DC电源模块,服务器和工作站,笔记本电脑和IBA电源.本文介绍MAX8655主要特性,功能方框图以及多种典型应用电路.
Highly Integrated, 25A, Wide-Input, Internal MOSFET, Step-Down Regulator
The MAX8655 synchronous-PWM buck regulator operates from a 4.5V to 25V input and generates an output voltage adjustable from 0.7V to 5.5V at loads up to 25A.Integrated power MOSFETs provide a small footprint, ease of layout, and reduced EMI. Removing the board trace inductances ensures the highest efficiency at high frequency.
The MAX8655 uses peak current-mode control architecture with an adjustable (200kHz to 1MHz), constantswitching frequency, which is externally synchronizable.
The MAX8655’s adjustable current limit uses the inductor’s DC resistance to improve efficiency or an external sense resistor for higher accuracy. Foldback type current limit is available to reduce the power dissipation under severe-overload or short-circuit conditions. A reference input is provided for use with a high-accuracy external reference or for DDR and tracking applications.
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