MAX17505

4.5V-60V、1.7A、高效同步降压型DC-DC转换器,内部补偿

业内仅有的60V、1.7A内部FET同步降压转换器


点击查看特定型号的库存状况。

说明

MAX17505是高效、高压、同步整流降压型转换器,内置双MOSFET,工作在4.5V至60V输入电压范围。器件提供高达1.7A的输出电流,输出电压可在0.9V至90%VIN范围调节。内部补偿覆盖整个输出电压范围,无需外部元件。反馈(FB)调节精度在-40°C至+125°C温度范围内为±1.1%。器件采用紧凑的(4mm x 4mm) TQFN无铅(Pb)封装,带裸焊盘;提供仿真模型。

器件采用峰值电流工作模式,带MODE控制引脚,用于控制工作在脉宽调制(PWM)、脉冲频率调制(PFM)或非连续传导模式(DCM)下。PWM工作模式在任何负载条件下都保持固定频率,在对开关频率敏感的应用中非常有用。PFM工作模式消除了负向电感电流以及轻载条件下额外的跳脉冲,以提高效率。DCM工作模式不采用跳脉冲,而是在轻载条件下禁止负向电感电流,在低于PFM模式电流的轻载条件下保持固定工作频率。DCM工作模式的效率介于PWM和PFM模式之间。内置低导通电阻MOSFET确保满载时高效工作,同时也简化了布局。

可编程软启动功能允许用户降低输入浪涌电流。器件还带有输出使能/欠压锁定引脚(EN/UVLO),允许用户在输入电压达到相应要求时开启器件。输出电压达到稳压范围时,经过一定延时后触发开漏/RESET输出,为系统提供电源就绪指示。
MAX17505: Typical Application Circuit MAX17505: Typical Application Circuit 放大+

关键特性

  • 无需外部元件,降低总体成本
    • 无需肖特基同步二极管即可保持高效、低成本工作
    • 内部补偿,在任意输出电压下均可稳定工作
    • 全陶瓷电容方案:超小尺寸布局,只需8个外部元件
  • 缩减DC-DC稳压器库存清单
    • 4.5V至60V宽输入电压范围
    • 0.9V至90%VIN输出电压
    • 整个温度范围内可提供高达1.7A电流
    • 200kHz至2.2MHz可调节频率,带外同步
    • 采用20引脚、4mm x 4mm TQFN封装
  • 降低功耗
    • 峰值效率高于90%
    • PFM和DCM模式,轻载时保持高效
    • 关断电流仅为2.8µA (典型值)
  • 工作可靠
    • 打嗝式限流和自动重启
    • 内置输出电压监测(开漏/RESET)
    • 电阻可编程EN/UVLO门限
    • 可调节软启动和预偏置上电
    • -40°C至+125°C工作温度范围

应用

  • 基站电源
  • 配电稳压器
  • 通用负载点电源
  • 高压单板系统
  • 工业电源
  • 壁式变压器稳压
Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Output Adjust. MethodIOUT1
(A)
Switch TypeSynchronous SwitchingPower Good SignalDC-DC OutputsOper. Freq.
(kHz)
Design ToolsPackage/PinsBudgetary
Price
minmaxminmaxSee Notes
MAX17505 4.5600.954Resistor1.7InternalYesYes12200EE-Sim
TQFN-CU/20
$1.94 @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。


MAX17505EVKITA: Evaluation Kit for the MAX17505 in 3.3V Output-Voltage Application
MAX17505EVKITB: Evaluation Kit for the MAX17505 in 5V Output-Voltage Application
MAX17505EVKITBE: Evaluation Kit for the MAX17505 in 5V Output-Voltage Application

工具和模型

  • EE-Sim: MAX17505 设计和仿真
  • 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 >
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    类型 编号 标题
    系统板6289MAXREFDES108#: Non-isolated 12V/1A PoE Powered Device Power Supply
    评估板8398MAX17505EVKITB Evaluation Kit for the MAX17505 in 5V Output-Voltage Application
    评估板8397MAX17505EVKITA Evaluation Kit for the MAX17505 in 3.3V Output-Voltage Application
    评估板10367MAX17505EVKITBE Evaluation Kit for the MAX17505 in 5V Output-Voltage Application