MAX17243

3.5V至36V、2A/3A、同步Buck转换器,15µA静态电流和低EMI

工作可靠(42V输入瞬态保护)、长电池寿命(15µA IQ)和EN55022 EMI性能


点击查看特定型号的库存状况。

说明

MAX17242/MAX17243高效、同步降压型DC-DC转换器集成MOSFET,工作在3.5V至36V输入电压范围,能够以99%占空比工作在低压差条件。转换器提供高达2A (MAX17242)和3A (MAX17243)输出电流,产生3.3V/5V固定输出电压,同时具备在1V至10V范围内编程输出电压的能力。

器件采用峰值限流控制结构,也可工作在脉宽调制(PWM)或脉冲频率调制(PFM)控制模式。PWM工作模式在任何负载条件下都保持固定频率工作,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,实现高效工作。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。

器件采用20引脚(5mm x 5mm) TQFN封装,带裸焊盘。器件工作在-40°C至+85°C温度范围。

设计资源: 在线仿真器验证Buck转换器输出误差预算分析 ›

MAX17242, MAX17243: Typical Application Circuit/Block Diagram MAX17242, MAX17243: Typical Application Circuit/Block Diagram 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
    • 简单的外部RC补偿,在任意输出电压下均可稳定工作
    • 全陶瓷电容设计:超小尺寸布局,外部元件只有8个
  • PGOOD输出和高压EN输入,简化电源排序
    • 减少DC-DC转换器库存清单
    • 2A/3A选项的引脚兼容
    • 固定输出电压,输出精度为±2% (5V/3.3V);或者外部电阻可调(1V至10V)输出,精度为±1% FB
    • 220kHz至2.2MHz可调节频率,带外同步
  • 降低功耗
    • 效率最高达93%
    • 关断功能,阻塞从输入到输出的电流或者反向电流
    • 关断模式下电流小于5µA (典型值)
    • 待机模式下静态电流仅为15µA (典型值)
  • 工作可靠
    • 42V输入电压瞬态保护
    • 固定8ms内部软启动,降低输入浪涌电流
    • 逐周期限流,自动恢复热关断
    • 通过扩频控制降低EMI辐射

应用

  • 配电稳压器
  • 通用负载点电源
  • 壁式变压器稳压
Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Preset VOUT
(V)
Output Adjust. MethodIOUT1
(A)
Switch TypeSynchronous SwitchingPower Good SignalDC-DC OutputsOper. Freq.
(kHz)
Design ToolsPackage/PinsBudgetary
Price
minmaxminmaxSee Notes
MAX17242 3.536110
3.3
5
Resistor2InternalYesYes1
220
2200
EE-Sim
TQFN-CU/20
$2.30 @1k
MAX17243 3
TQFN-CU/20
$2.72 @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。


MAX17243EVKIT: MAX17243评估板
MAX17242EVKIT: MAX17242评估板

工具和模型

  • EE-Sim: MAX17243 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。

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    类型 编号 标题
    评估板9145MAX17242EVKIT MAX17242评估板
    评估板9144MAX17243EVKIT MAX17243评估板