MAX1809

3A、1MHz、DDR存储器端接电源


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说明

MAX1809是一款允许反向能量灌入、固定断开时间、脉宽调制(PWM)、降压型DC-DC转换器。它对需要1.1V至5V有源终端电源的笔记本和亚笔记本电脑是理想的选择。该款器件具有内部PMOS电源开关和同步整流器,提高了转换效率、并大大减少了元件的数量。内置90mΩ PMOS电源开关和70mΩ NMOS同步整流器开关,可轻松提供高达3A的连续负载电流。MAX1809可以精确的跟踪一个外部参考电压,产生从1.1V至VIN的可调输出电压,效率高达93%。

MAX1809采用一个独特的电流模式、固定断开时间、PWM控制结构,允许输出或灌入电流。该特性允许能量返回到输入电源,否则这部分能量将被浪费掉。可编程的固定断开时间结构可设置高至1MHz的开关频率,并允许用户在效率、输出开关噪声、元件尺寸和成本之间进行性能优化。MAX1809具有可调节的软启动特性,可有效限制启动过程的浪涌电流,另外,100%占空比允许工作在极低的压差,低功耗关断模式可禁止电源切换、使电源电流降低至1µA以下。MAX1809采用焊盘裸露的、28引脚QFN封装或薄型、28引脚QFN封装和16引脚QSOP封装。
MAX1809:典型工作电路 MAX1809:典型工作电路 放大+

关键特性

  • 输出/灌入3A电流
  • ±1%的输出精度
  • 高达1MHz的开关频率
  • 93%的效率
  • 内置PMOS/NMOS开关
    • VIN = 4.5V时具有90mΩ/70mΩ导通电阻
    • 在VIN = 3V时具有110mΩ/80mΩ导通电阻
  • 1.1V至VIN可调节输出电压
  • 3V至5.5V输入电压范围
  • <1µA关断电流
  • 可编程固定断开时间
  • 热关断
  • 可调节软启动限制浪涌电流
  • 输出短路保护

应用

  • 有源端接总线(MAX1993)
  • DDR存储器端接(MAX1993)
Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Output Adjust. MethodIOUT1
(A)
Switch TypeSynchronous SwitchingDC-DC OutputsOper. Freq.
(kHz)
Package/PinsBudgetary
Price
minmaxminmaxSee Notes
MAX1809 35.51.15.5Resistor3InternalYes11000
QFN/28
QSOP/16
TQFN/28
$5.19 @1k
查看所有Step-Down Switching Regulators (404)
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。


MAX1809EVKIT: MAX1809评估板

质量和环境数据

产品可靠性报告: MAX1809.pdf 
无铅封装的锡(Sn)晶须报告
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。

质量管理体系 >
环境管理体系 >

 
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类型 编号 标题
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