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MAX1864, MAX1865
用于xDSL/电缆调制解调器的三/五路输出电源


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数据资料
完整的数据资料 (PDF, 380kB)
英文 Download this datasheet in PDF format下载

概述
The MAX1864/MAX1865 power-supply controllers are designed to address cost-conscious applications such as cable modem Consumer Premise Equipment (CPE), xDSL CPE, and set-top boxes. Operating off a low-cost, unregulated DC supply (such as a wall adapter output), the MAX1864 generates three positive outputs, and the MAX1865 generates four positive outputs and one negative output to provide a cost-effective system power supply.

The MAX1864 includes a current-mode synchronous step-down controller and two positive regulator gain blocks. The MAX1865 has one additional positive gain block and one negative regulator gain block. The main synchronous step-down controller generates a high-current output that is preset to 3.3V or adjustable from 1.236V to 0.8 x VIN with an external resistive-divider. The 100kHz/200kHz operating frequency allows the use of low-cost aluminum-electrolytic capacitors and low-cost power magnetics. Additionally, the MAX1864/MAX1865 step-down controllers sense the voltage across the low-side MOSFET's on-resistance to efficiently provide the current-limit signal, eliminating the need for costly current-sense resistors.

The MAX1864/MAX1865 generate additional supply rails at low cost. The positive regulator gain blocks use an external PNP pass transistor to generate low-voltage rails directly from the main step-down converter (such as 2.5V or 1.8V from the main 3.3V output) or higher voltages using coupled windings from the step-down converter (such as 5V, 12V, or 15V). The MAX1865's negative gain block uses an external NPN pass transistor in conjunction with a coupled winding to generate -5V, -12V, or -15V.

All output voltages are externally adjustable, providing maximum flexibility. Additionally, the MAX1864/MAX1865 feature soft-start for the step-down converter and all the positive linear regulators, and have a power-good output that monitors all of the output voltages.

关键特性   应用/使用
  • 4.5V to 28V Input Voltage Range
  • Master DC-DC Step-Down Converter
    • Preset 3.3V or Adjustable (1.236V to 0.8 x VIN) Output Voltage
    • Fixed-Frequency (100kHz/200kHz) PWM Controller
    • No Current-Sense Resistor
    • Adjustable Current Limit
    • 95% Efficient
  • Two (MAX1864)/Four (MAX1865) Analog Gain Blocks
    • Positive Analog Blocks Drive Low-Cost PNP Pass Transistors to Build Positive Linear Regulators
    • Negative Analog Block (MAX1865) Drives a Low-Cost NPN Pass Transistor to Build a Negative Linear Regulator
  • Power-Good Indicator
  • Soft-Start Ramp for All Positive Regulators

 
  • 机顶盒
  • 无线本地环路(WLL)
  • xDSL、线缆和ISDN调制解调器

    Key Specifications:   Switch-Mode DC-DC Power Supplies
    Part Number Topology VIN (min) (V) VIN (max) (V) Number of DC-DC Outputs Digital/VID Programmed Output Operating Current, ICC (max) (mA) Fixed Freq/PWM Operation Operating Freq. (kHz) Internal Power Switch(es) Synchronous Rectifier Package Smallest Available Package (max w/pins) (mm2) Price**
    MAX1864  Inverting 4.5 28 1 No 2 Yes 200 No No QSOP/16 31 $1.75 @ 1k
    MAX1865  QSOP/20 54 $2.45 @ 1k
    See All Switch-Mode DC-DC Power Supplies (418)
    Notes:
    **This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

    图表
    MAX1864,MAX1865:典型工作电路
    典型工作电路

    应用笔记
  • App Note 735: Layout Considerations for Non-Isolated DC-DC Converters - MAX1864, MAX1865, MAX1865 (English only)
  • App Note 821: The MAX1864/MAX1865 Compensation Calculator - MAX1864, MAX1865 (English only)
  • App Note 905: Adding POR Function to the MAX1864 Generating Two Outputs - MAX1864 (English only)
  • App Note 906: The MAX1864 Generates 1.2V or Lower Output Voltage - MAX1864 (English only)
  • App Note 1843: Noise Reduction For ADSL Modem Power - MAX1864 (English only)
  • App Note 1857: DDR Memory-Termination Supply - MAX1864 (English only)
  • App Note 3626: Adding a Watchdog to a Dual-Output Power Supply - MAX1864 (English only)
  • App Note 3654: Current Limiting for the MAX1864 Auxiliary Regulator - MAX1864, MAX1865 (English only)
  • App Note 3672: Noise Reduction for the MAX1864 Auxiliary Regulator - MAX1864, MAX1865 (English only)

    评估板
  • MAX1864EVKIT

    设计指南
  • 电源 (PDF)

    可靠性报告
  • 查询FIT数据:
  • 可靠性报告: MAX1864TEEE.pdf (English only)
  • 申请可靠性报告: (English only)

    软件/模型

    定购信息
    注:

    1. 购买产品,请访问:http://www.maxim-ic.com.cn/sales
    2. 没有找到您所需要的器件?请咨询我们的应用工程师。我们的专家会帮助您找到合适的器件,通常在一个工作日内回复。
    3. 型号尾缀:T或T&R = 卷带; + = RoHS/无铅; # = RoHS/无铅豁免权。详细信息请参考:完整的数据资料型号命名规则
    4. * “封装代码/变更”提供产品使用的变更信息。注意:型号尾缀中的“+”、“#”和“-”表示器件的RoHS状况,封装图上可能显示不同的尾缀字符。


    器件: 1-12 of 12

    MAX1864 免费样品 采购
    封装: 类型 引脚 占位面积
      封装图编码/变更 *
    温度 RoHS/无铅?
    材料分析
    MAX1864TEEE  
    QSOP;16引脚;31mm²
    封装图: 21-0055G (PDF)
    使用封装码/变更:E16-1*
    -40°C至+85°C RoHS/无铅:
    材料分析
    MAX1864TEEE-T  
    QSOP;16引脚;31mm²
    封装图: 21-0055G (PDF)
    使用封装码/变更:E16-1*
    -40°C至+85°C RoHS/无铅:
    材料分析
    MAX1864UEEE  
    QSOP;16引脚;31mm²
    封装图: 21-0055G (PDF)
    使用封装码/变更:E16-1*
    -40°C至+85°C RoHS/无铅:
    材料分析
    MAX1864UEEE-T  
    QSOP;16引脚;31mm²
    封装图: 21-0055G (PDF)
    使用封装码/变更:E16-1*
    -40°C至+85°C RoHS/无铅:
    材料分析
    MAX1864TEEE+T  
    QSOP;16引脚;31mm²
    封装图: 21-0055G (PDF)
    使用封装码/变更:E16+1*
    -40°C至+85°C RoHS/无铅:无铅
    材料分析
    MAX1864TEEE+  
    QSOP;16引脚;31mm²
    封装图: 21-0055G (PDF)
    使用封装码/变更:E16+1*
    -40°C至+85°C RoHS/无铅:无铅
    材料分析
    MAX1865 免费样品 采购
    封装: 类型 引脚 占位面积
      封装图编码/变更 *
    温度 RoHS/无铅?
    材料分析
    MAX1865TEEP+  
    QSOP;20引脚;54mm²
    封装图: 21-0055G (PDF)
    使用封装码/变更:E20+1*
    -40°C至+85°C RoHS/无铅:无铅
    材料分析
    MAX1865TEEP+T  
    QSOP;20引脚;54mm²
    封装图: 21-0055G (PDF)
    使用封装码/变更:E20+1*
    -40°C至+85°C RoHS/无铅:无铅
    材料分析
    MAX1865UEEP-T  
    QSOP;20引脚;54mm²
    封装图: 21-0055G (PDF)
    使用封装码/变更:E20-1*
    -40°C至+85°C RoHS/无铅:
    材料分析
    MAX1865TEEP-T  
    QSOP;20引脚;54mm²
    封装图: 21-0055G (PDF)
    使用封装码/变更:E20-1*
    -40°C至+85°C RoHS/无铅:
    材料分析
    MAX1865TEEP  
    QSOP;20引脚;54mm²
    封装图: 21-0055G (PDF)
    使用封装码/变更:E20-1*
    -40°C至+85°C RoHS/无铅:
    材料分析
    MAX1865UEEP  
    QSOP;20引脚;54mm²
    封装图: 21-0055G (PDF)
    使用封装码/变更:E20-1*
    -40°C至+85°C RoHS/无铅:
    材料分析

    更多信息
  • 新品发布 2001-05-24  (English only)
  • MAX1864, MAX1865电源设计手册

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  • 参数搜索
  • 应用帮助
  •  快速浏览   技术文档   定购信息   更多信息  
     概述 
     关键特性 
     应用/使用 
     关键指标 
     图表 

     数据资料 
     应用笔记 
     设计指南 
     工程期刊 
     可靠性报告 
     软件/模型 
     评估板 

     价格与供货 
     样品 
     在线订购 
     封装信息 
     无铅信息 

     相关产品 
     注释、注解 
     评估板 

    参考文献: 19-2030; Rev. 0; 2001-06-01
    本页最后一次更新: 2008-05-30



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