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MAX1734

MAX1734

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

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概述

说明

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.
MAX1733、MAX1734：典型工作电路 MAX1733、MAX1734：典型工作电路 放大+

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

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)

参数规格

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
minmaxminmaxSee Notes
MAX1733 2.75.51.252-Resistor0.25InternalYes11200
SOT23/5
$1.99 @1k
MAX1734 1.51.8
1.5
1.8
Preset
Resistor
SOT23/5
查看所有Step-Down Switching Regulators (388)
Pricing Notes:
价格仅供参考，用于同类产品的比较。所提供报价为美元，需要依汇率折合成人民币。该价格将因当地关税、税率和汇率而异。有关特定订购量和指定版本的报价和供货问题，请参考：价格与供货网站或与指定代理商联系。

设计资源


MAX1734EVKIT: MAX1733、MAX1734评估板

技术资料

应用笔记 1121 Using Ceramic Output Capacitors with the MAX1734 Voltage-Mode Buck Converter

质量和环境数据

申请可靠性报告: MAX1734 
无铅封装的锡（Sn）晶须报告

质量与环境

型号   生产流程   工艺   样本量   不合格   FIT @ 25°C   FIT @ 55°C  

备注： 通过技术手段对故障率进行汇总，并映射到相关的材料部件号。 故障率与被测件的数量密切相关。

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    技术文档

    类型 编号 PDF 标题
    应用笔记 1121 Using Ceramic Output Capacitors with the MAX1734 Voltage-Mode Buck Converter

    参考设计

    类型 编号 标题
    评估板2426MAX1733EVKIT MAX1733、MAX1734评估板
    评估板2426MAX1734EVKIT MAX1733、MAX1734评估板