MAX1733:低电压、降压型DC-DC转换器,SOT23封装

高效DC-DC方案,用于低压逻辑电路供电

The MAX1733/MAX1734 step-down DC-DC converters deliver over 250mA to outputs as low as 1.25V. These converters use a unique proprietary current-limited control scheme that achieves over 90% efficiency. These devices maintain extremely low quiescent supply current (40µA), and their high 1.2MHz (max) operating frequency permits small, low-cost external components. This combination of features makes the MAX1733/ MAX1734 excellent high-efficiency alternatives to linear regulators in space-constrained applications. Internal synchronous rectification greatly improves efficiency and eliminates the external Schottky diode required in conventional step-down converters. Both devices also include internal digital soft-start to limit input current upon startup and reduce input capacitor requirements. The MAX1733 provides an adjustable output voltage (1.25V to 2.0V). The MAX1734 provides factory-preset output voltages (see Selector Guide). Both are available in space-saving 5-pin SOT23 packages.

关键特性
  • 250mA Guaranteed Output Current
  • Synchronous Rectifier for Over 90% Efficiency
  • Tiny 5-Pin SOT23 Package
  • 40µA Quiescent Supply Current
  • 0.01µA Logic-Controlled Shutdown
  • Up to 1.2MHz Switching Frequency
  • Fixed 1.8V or 1.5V Outputs (MAX1734)
  • Adjustable Output Voltage (MAX1733)
  • ±1.5% Initial Accuracy
  • 2.7V to 5.5V Input Range
  • Soft-Start Limits Startup Current
MAX1733、MAX1734:典型工作电路
MAX1733、MAX1734:典型工作电路
应用
  • 蜂窝电话
  • 计算机:台式机、工作站和服务器
  • 消费类音频
  • 数码相机
  • 全球定位系统(GPS)
  • 掌上电脑
  • POS终端
  • 无线数据
  • 无线局域网(WLAN)
数据手册DataSheet
语言下载文件备注
英文MAX1733-MAX1734.pdfRev 0; 09/2000
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
MAX17332.75.51.252-Resistor0.25InternalYes11200SOT/5$1.89 @1k
MAX17341.51.8
  • 1.5
  • 1.8
  • Preset
  • Resistor
SOT/5
开发工具
技术资料
相关产品
  • MAX1692:低噪声、5.5V输入、PWM降压型稳压器
订购型号
型号状况推荐替代产品封装温度RoHS/无铅
MAX1733EUK停止供货MAX1733EUK+SOT,;5引脚;9mm²-40°C至+85°CRoHS/无铅:否
MAX1733EUK+生产中SOT,;5引脚;9mm²-40°C至+85°CRoHS/无铅:无铅
MAX1733EUK+T生产中SOT,;5引脚;9mm²-40°C至+85°CRoHS/无铅:无铅
MAX1733EUK-T停止供货MAX1733EUK+TSOT,;5引脚;9mm²-40°C至+85°CRoHS/无铅:否
MAX1733EUK-TG05停止供货SOT;-40°C至+85°C参考数据资料
MAX1733-MAX1734.pdf MAX1734
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典型工作电路 MAX1734