MAX797H:高压、同步整流、降压型控制器,用于CPU电源

The MAX797H high-performance, step-down DC-DC converter provides main CPU power in battery-powered systems. A 40V rating on the power stage's input allows operation with high-cell-count batteries and a wide range of AC adapters. 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. 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 MAX797H 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. The MAX797H is pin compatible with the popular MAX797, but has a higher input voltage range. The MAX797H comes in a 16-pin narrow SO package.

关键特性
  • 96% Efficiency
  • Up to 40V Power Input
  • 2.5V to 6V Adjustable Output
  • Preset 3.3V and 5V Outputs (at up to 10A)
  • 5V Linear-Regulator Output
  • Precision 2.505V Reference Output
  • Automatic Bootstrap Circuit
  • 150kHz/300kHz Fixed-Frequency PWM Operation
  • Programmable Soft-Start
  • 375µA Quiescent Current (VIN = 12V, VOUT = 5V)
  • 1µA Shutdown Current
MAX797H:典型工作电路
MAX797H:典型工作电路
应用
  • 工业控制
  • 笔记本电脑和亚笔记本电脑
数据手册DataSheet
语言下载文件备注
英文MAX797H.pdfRev 0; 07/1997
关键参数
Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Preset VOUT
(V)
Output Adjust. MethodIOUT1
(A)
Switch TypeSynchronous SwitchingDC-DC OutputsOper. Freq.
(kHz)
Package/PinsBudgetary
Price
minmaxminmaxmaxSee Notes
MAX797H4.5402.56
  • 3.3
  • 5
  • Preset
  • Resistor
10ExternalYes1340SOIC(N)/16$5.58 @1k
相关产品
  • MAX1652:高效率、PWM、降压型DC-DC控制器,16引脚QSOP封装
订购型号
型号状况推荐替代产品封装温度RoHS/无铅
MAX797HESE停止供货MAX797HESE+SOIC(N),;16引脚;61.9mm²-40°C至+85°CRoHS/无铅:否
MAX797HESE+生产中SOIC(N),;16引脚;61.9mm²-40°C至+85°CRoHS/无铅:无铅
MAX797HESE+T生产中SOIC(N),;16引脚;61.9mm²-40°C至+85°CRoHS/无铅:无铅
MAX797HESE-T停止供货MAX797HESE+TN.SO;16引脚-40°C至+85°C参考数据资料
MAX797H.pdf MAX797H
典型工作电路 MAX797H