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Maxim产品 - MAX799介绍

MAX799 - 同步整流降压型控制器，用于CPU电源

MAX799是Maxim美信半导体公司的一款DC-DC开关调节器产品，MAX799是同步整流降压型控制器，用于CPU电源，本站介绍了MAX799的封装应用图解、特点和优点、功能等，并给出了与MAX799相关的Maxim元器件型号供参考。

MAX799 - 同步整流降压型控制器，用于CPU电源 - DC-DC开关调节器 - 对于新设计推荐使用性能更好的器件：MAX1652/MAX1653/MAX1654/MAX1655 - 美信半导体

产品概述

The MAX796/MAX797/MAX799 high-performance, step-down DC-DC converters with single or dual outputs provide main CPU power in battery-powered systems. These buck controllers achieve 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. 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 MAX796/MAX799 are specially equipped with a secondary feedback input (SECFB) for transformer-based dual-output applications. This secondary feedback path improves cross-regulation of positive (MAX796) or negative (MAX799) auxiliary outputs.

The MAX797 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-bar 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.

The MAX796/MAX797/MAX799 are all available in 16-pin DIP and narrow SO packages. See the table below to compare these three converters.

关键特性
  • 以下关键特性由Maxim美信半导体提供：
  • 96% Efficiency
  • 4.5V to 30V Input Range
  • 2.5V to 6V Adjustable Output
  • Preset 3.3V and 5V Outputs (at up to 10A)
  • Multiple Regulated Outputs
  • +5V Linear-Regulator Output
  • Precision 2.505V Reference Output
  • Automatic Bootstrap Circuit
  • 150kHz/300kHz Fixed-Frequency PWM Operation
  • Programmable Soft-Start
  • 375µA Typ Quiescent Current (VIN = 12V, VOUT = 5V)
  • 1µA Typ Shutdown Current
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