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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

产品详情

主要特征

应用/用途

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 2.7
VIN (V) (max) 5.5
VOUT1 (V) (min) 1.25
VOUT1 (V) (max) 2
IOUT1 (A) (max) 0.25
Switch Type Internal
Output Adjust. Method Resistor
Synchronous Switching? Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 1200
Package/Pins SOT23/5
Budgetary
Price (See Notes)
1.99
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参量

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 2.7
VIN (V) (max) 5.5
VOUT1 (V) (min) 1.25
VOUT1 (V) (max) 2
IOUT1 (A) (max) 0.25
Switch Type Internal
Output Adjust. Method Resistor
Synchronous Switching? Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 1200
Package/Pins SOT23/5
Budgetary
Price (See Notes)
1.99

主要特征

  • 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

应用/用途

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  • 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)

描述

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.

简化框图

MAX1733、MAX1734:典型工作电路 MAX1733、MAX1734:典型工作电路 Zoom icon

技术文档

支持和培训

在Maxim的知识库中搜索技术问题的答案

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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