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MAX1945

MAX1945R, MAX1945S

1MHz、1%精度、6A内置开关、降压型调节器

尺寸最小的6A、1MHz、1%精度降压型DC-DC转换器，内置开关

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概述

说明

MAX1945R/MAX1945S高效率、脉宽调制(PWM)开关稳压器可输出高达6A的输出电流。该器件可以工作在2.6V至5.5V的输入电源范围，提供可选的1.8V、2.5V预置输出，或0.8V至85%输入电源的可调输出。在VCC为3.3V或者5V时，输入电压可以低至2.25V。MAX1945R/MAX1945S尤其适合于那些需要板上后稳压的应用。在整个负载、线路和温度范围内，总输出电压误差小于±1%。

MAX1945R/MAX1945S可以工作在可选的固定工作频率(500kHz或者1MHz)或者同步到外部时钟(400kHz至1.2MHz)。较高的工作频率尽可能地减小了外部元件的尺寸。内部误差放大器的高带宽提供了出色的瞬态响应。MAX1945R/MAX1945S具有内部双N沟道MOSFET，降低重负载时的热损耗。两片MAX1945R/MAX1945S可以工作在180度错相方式，尽可能地减少了输入电容。该器件提供了输出电压上下限选择，用于板级测试。MAX1945R提供±4%的电压上下限选择。MAX1945S提供±9%的电压上下限选择。

MAX1945R/MAX1945S采用28引脚的TSSOP-EP封装，工作在-40°C至+85°C温度范围。备有评估板，以加快设计。

有关PowerMind™的更多信息。
MAX1945R、MAX1945S：典型工作电路 MAX1945R、MAX1945S：典型工作电路 放大+

关键特性

  • 95%效率、6A的PWM降压稳压器
  • 1MHz/500kHz的开关频率，允许使用小的外部元件
  • 0.76in²板上面积的完整6A稳压器
  • 外部元件高度<3mm
  • 在整个负载和线路负载下，±1%精度的输出电压
  • 工作在2.6V至5.5V输入电源
  • 在VCC为3.3V或者5V时，能够工作于2.5V输入
  • 预置1.8V或者2.5V的输出电压
  • 0.8V至85%输入电源的可调输出电压
  • 电压上下限选择：±4% (MAX1945R)或者±9% (MAX1945S)
  • 同步到外部时钟
  • SYNCOUT提供180度错相时钟输出
  • 全部采用陶瓷或电解电容设计

应用

  • ASIC/CPU/DSP核电压
  • 基站、电信和网络设备电源
  • 低电压、高密度分布式电源
  • RAM电源
  • 服务器与笔记本电源

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
MAX1945 2.65.50.84.5
1.8
2.5
Preset
Resistor
6InternalYes1500
TSSOP/28
$4.68 @1k
查看所有Step-Down Switching Regulators (389)
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


MAX1945EVKIT: MAX1945评估板

质量和环境数据

申请可靠性报告: MAX1945R  MAX1945S 
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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    参考设计

    类型 编号 标题
    评估板3669MAX1945EVKIT MAX1945评估板