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MAX17244

MAX17244

3.5V至36V、2.5A、同步Buck转换器，28μA静态电流和低EMI

低静态电流和同步转换延长电池寿命

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概述

说明

MAX17244高效、同步降压型DC-DC转换器内置MOSFET，工作在3.5V至36V输入电压范围，具有42V输入瞬态保护。能够以98%占空比工作在低压差条件。转换器提供高达2.5A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。

MAX17244采用电流模式控制架构。器件可工作在脉宽调制(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，以提高效率。轻载应用中，外部同步引脚FSYNC逻辑输出允许器件工作在PFM模式或固定频率FPWM (强制PWM)模式；前者可降低耗流，后者可避免频率波动，最大程度减小EMI。对于设计用于RF收发器的电源，要求严格的辐射控制，固定频率FPWM模式极其有用。

器件采用小尺寸16引脚(5mm x 5mm) TQFN封装，带裸焊盘；以及16引脚TSSOP封装。-40°C至+85°C工作温度范围。

MAX17244: Internal Block Diagram MAX17244: Internal Block Diagram 放大+

关键特性

  • 无需外部元件，降低总体成本
    • 集成高边和低边开关支持同步操作，实现高效率和低成本
    • 全陶瓷电容方案，支持超紧凑方案尺寸
    • 220kHz至2.2MHz可调节频率，带外同步
    • 电源就绪输出和高压EN输入，简化电源排序
  • 提高设计灵活性
    • SYNCOUT引脚180°错相输出，支持级联电源，提高功率输出
    • 固定输出电压，输出精度为±2% (5V/3.3V)；或外部电阻可调(1V至10V)
  • 降低功耗
    • 峰值效率高于90%
    • PWM和PFM操作优化从重载到轻载的转换效率
    • LX摆率自动调节，整个工作频率范围内实现效率最优化
    • 5µA (典型值)低关断电流
    • 28µA (典型值)静态电流
  • 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

参数规格

Part NumberVIN
(V)		VIN
(V)		VOUT1
(V)		VOUT1
(V)		Preset VOUT
(V)		Output Adjust. MethodIOUT1
(A)		Switch TypePower Good SignalDC-DC OutputsOper. Freq.
(kHz)		Design ToolsPackage/PinsBudgetary
Price
minmaxminmaxSee Notes
MAX17244 3.542110
3.3
5
Preset
Resistor
2.5InternalYes1
200
2200
EE-Sim
TQFN-CU/16
$2.43 @1k
查看所有Step-Down Switching Regulators (388)
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


MAX17244EVKIT: Evaluation Kit for the MAX17244

质量和环境数据

申请可靠性报告: MAX17244 
无铅封装的锡（Sn）晶须报告

工具和模型

  • EE-Sim: MAX17244 设计和仿真
  • MAX17244 SIMPLIS Schematic

    •

    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