MAX1791:高效率、10引脚µMAX、降压型控制器,用于笔记本电脑

The MAX1762/MAX1791 PWM step-down controllers provide high efficiency, excellent transient response, and high DC output accuracy needed for stepping down, high-voltage batteries to generate low-voltage CPU core, I/O, and chipset RAM supplies in notebook computers and PDAs. Maxim's proprietary Quick-PWM™ pulse-width modulator is a free-running constant on-time type with input feed-forward. Its high operating frequency (300kHz) allows small external components to be utilized in PC board area-critical applications such as subnotebook computers and smart phones. PWM operation occurs at heavy loads, and automatic switchover to pulse-skipping operation occurs at lighter loads. The external high-side p-channel and low-side n-channel MOSFETs require no bootstrap components. The MAX1762/MAX1791 are simple, easy to compensate, and do not have the noise sensitivity of conventional fixed-frequency current-mode PWMs. These devices achieve high efficiency at a reduced cost by eliminating the current-sense resistor found in traditional current-mode PWMs. Efficiency is further enhanced by their ability to drive synchronous-rectifier MOSFETs. The MAX1762/MAX1791 come in a 10-pin µMAX® package and offer two fixed voltages (Dual Mode™) for each device, 1.8V/2.5V/adj (MAX1762) and 3.3V/5.0V/adj (MAX1791).

关键特性
  • High Operating Frequency (300kHz)
  • No Current-Sense Resistor
  • Accurate Current Limit
  • ±1% Total DC Error over Line and During Continuous Conduction
  • Dual Mode Fixed Output
    • 1.8V/2.5V/adj (MAX1762)
    • 3.3V/5.0V/adj (MAX1791)
  • 0.5V to 5.5V Output Adjust Range
  • 5V to 20V Input Range
  • Automatic Light-Load Pulse Skipping Operation
  • Free-Running On-Demand PWM
  • Foldback Mode™ UVLO
  • PFET/NFET Synchronous Buck
  • 4.65V at 25mA Linear Regulator Output
  • 5µA Shutdown Supply Current
  • 230µA Quiescent Supply Current
  • 10-Pin µMAX Package
MAX1762、MAX1791:典型工作电路
MAX1762、MAX1791:典型工作电路
应用
  • 双向寻呼器
  • 模拟蜂窝电话
  • 数字蜂窝电话
  • 数码相机
  • 笔记本电脑
数据手册DataSheet
语言下载文件备注
英文MAX1762-MAX1791.pdfRev 1; 05/2006
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
MAX17625200.55.5
  • 1.8
  • 2.5
  • Preset
  • Resistor
2ExternalYes1300µMAX/10$2.18 @1k
MAX1791
  • 3.3
  • 5
µMAX/10$3.04 @1k
开发工具
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订购型号
型号状况推荐替代产品封装温度RoHS/无铅
MAX1791EUB停止供货MAX1791EUB+µMAX,;10引脚;15.4mm²-40°C至+85°CRoHS/无铅:否
MAX1791EUB+生产中µMAX,;10引脚;15.4mm²-40°C至+85°CRoHS/无铅:无铅
MAX1791EUB+T生产中µMAX,;10引脚;15.4mm²-40°C至+85°CRoHS/无铅:无铅
MAX1791EUB-T生产中µMAX,;10引脚;15.4mm²-40°C至+85°CRoHS/无铅:否
MAX1762-MAX1791.pdf MAX1791
典型工作电路 MAX1791