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高精度、同步整流、降压型控制器,用于CPU电源

在较宽的负载范围内保持高效

产品详情

主要特征

应用/用途

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 4.5
VIN (V) (max) 30
VOUT1 (V) (min) 1.6
VOUT1 (V) (max) 6
IOUT1 (A) (max) 10
Switch Type External
Output Adjust. Method Resistor
Synchronous Switching? Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 340
Package/Pins SOIC (N)/16
Budgetary
Price (See Notes)
7.1
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参量

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 4.5
VIN (V) (max) 30
VOUT1 (V) (min) 1.6
VOUT1 (V) (max) 6
IOUT1 (A) (max) 10
Switch Type External
Output Adjust. Method Resistor
Synchronous Switching? Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 340
Package/Pins SOIC (N)/16
Budgetary
Price (See Notes)
7.1

主要特征

  • 96% Efficiency
  • 4.5V to 30V Input Range
  • 1.6V to 6V Adjustable Precision Output
  • ±0.4% Max Total Load-Regulation Error
  • 0.06%/V Max Line-Regulation Error
  • 5V Linear-Regulator Output
  • Precision 2.505V Reference Output
  • Automatic Bootstrap Circuit
  • 150kHz/300kHz Fixed-Frequency PWM Operation
  • Programmable Soft-Start
  • 1.2mA Typical Quiescent Current (VIN = 12V, VOUT = 2.5V)
  • 1µA Typical Shutdown Current

应用/用途

  • 笔记本电脑和亚笔记本电脑
  • PDA与移动通信

描述

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.

简化框图

MAX798:典型工作电路 MAX798:典型工作电路 Zoom icon

支持和培训

在Maxim的知识库中搜索技术问题的答案

过滤搜索

Maxim的专业工程师团队也会为您解答相应的技术问题,请访问Maxim的 支持中心