MAX8792

单通道Quick-PWM降压型控制器,具有动态REFIN

小封装、单通道降压转换器,具有动态REFIN


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说明

MAX8792脉宽调制(PWM)控制器具有高效率、出色的瞬态响应和极高的直流输出精度,能够将较高的电池电压转换成笔记本电脑内部的核或芯片组/RAM所需的低电压偏置电源。输出电压由动态REFIN控制,该动态电压支持0至2V的输入范围。REFIN调节与反馈输入端的电阻分压器相结合,可将MAX8792输出电压设置在0至0.9VIN之间。

Maxim专有的Quick-PWM™快速响应、固定导通时间PWM控制架构可轻松应对宽输入/输出电压比(低占空比),并对负载瞬变提供100ns的“立即导通”响应,同时保持相对固定的开关频率。内置的驱动器具有很强的驱动能力,可使MAX8792有效驱动较大的同步整流MOSFET。

控制器检测流过同步整流器的电流,从而实现低成本、高效谷电流限制保护。可调节的限流门限提高了设计灵活性,采用NTC可实现热补偿保护;采用输出分压方式能够实现折返式限流保护。

MAX8792包含电压控制的软启动和软关断,有效抑制输入浪涌电流,保证单调上电(到达预充电压),并可预置上电时间。该控制器还具有输出故障保护(欠压和过压保护)以及热故障保护功能。

MAX8792采用小型14引脚、3mm x 3mm、TDFN封装。对于空间受限的应用,请参见采用小型40引脚、6mm x 6mm、TQFN封装的内置10A、26V MOSFET的降压控制器MAX17016。
MAX8792:典型工作电路 MAX8792:典型工作电路 放大+

关键特性

  • 具有快速瞬态响应的Quick-PWM控制架构
  • 支持任何类型的输出电容
    • 采用聚合物/钽电容时,无需补偿设计
    • 采用陶瓷输出电容时,需进行外部补偿实现稳定工作
  • 2V ±10mV精密基准
  • 动态可调节输出电压(0至0.9VIN)
    • 反馈输入电压范围为0至2V REFIN
    • 在整个输入电源和负载变化范围内,VOUT精度保持在0.5%
  • 26V最大额定输入电压
  • 可调节的谷电流限制保护
    • 采用NTC进行热补偿
    • 支持折返式限流
  • 开关频率可由电阻设置
  • 过压保护
  • 欠压保护/热保护
  • 电压软启动和软关断
  • 单调上电至预充输出
  • 电源就绪窗比较器

应用

  • DDR存储—VDDQ或VTT
  • GPU核电源
  • I/O和芯片组供电电源
  • 笔记本电脑
  • 负载点应用
  • 降压型电源
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
MAX8792 226023Dyn. REF In13ExternalYes1300
TDFN/14
$4.65 @1k
查看所有Step-Down Switching Regulators (402)
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。


MAX8792EVKIT: MAX8792评估板

技术资料

设计指南 5133 Power-Supply Solutions for Altera FPGAs
设计指南 5132 Power-Supply Solutions for Xilinx FPGAs

质量和环境数据

产品可靠性报告: MAX8792.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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Package:
Temperature:

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类型 编号 标题
评估板5898MAX8792EVKIT MAX8792评估板