MAX798中文资料高精度、同步整流、降压型控制器，用于CPU电源数据手册ADI规格书

描述 Description

The MAX798 high-performance, step-down DC-DC converter provides main CPU power in battery-powered systems. This buck controller achieves 96% efficiency by using synchronous rectification and Maxim's proprietary Idle Mode™ control scheme to extend battery life at full-load (up to 10A) and no-load outputs. The MAX798's high accuracy meets the demanding requirements of the latest-generation CPUs. Excellent dynamic response corrects output transients caused by the latest dynamic-clock CPUs within five 300kHz clock cycles. Unique bootstrap circuitry drives inexpensive N-channel MOSFETs, reducing system cost and eliminating the crowbar switching currents found in some PMOS/NMOS switch designs.
The MAX798 has a logic-controlled and synchronizable fixed-frequency pulse-width-modulating (PWM) operating mode, which reduces noise and RF interference in sensitive mobile-communications and pen-entry applications. The SKIP override input allows automatic switchover to idle-mode operation (for high-efficiency pulse skipping) at light loads, or forces fixed-frequency mode for lowest noise at all loads.

特性 Features

• 96% Efficiency
• 1.6V to 6V Adjustable Precision Output
• 0.06%/V Max Line-Regulation Error
• Precision 2.505V Reference Output
• 150kHz/300kHz Fixed-Frequency PWM Operation
• 1.2mA Typical Quiescent Current (VIN = 12V, VOUT = 2.5V)
• 1µA Typical Shutdown Current

应用 Application

• 笔记本电脑和亚笔记本电脑
• PDA与移动通信

简介

MAX798属于集成电路（IC）的PMIC-稳压器-DCDC开关式控制器。由ADI制造生产的MAX798DC-DC 开关控制器PMIC（电源管理集成电路）DC 到 DC 开关式控制器是用于高效率电路的稳压 IC，其配置为生成高于（突升或步升）或低于（突降或步降）输入电源的输出电源电压。其他拓扑结构可能包括：降压-升压、反激、正激、Cuk、SEPIC、全桥、半桥和推挽式。这些器件不同于需要最小电压并“烧尽”多余电压的线性稳压器。