MAX1957

低成本、高频、电流模式PWM buck控制器


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说明

MAX1953/MAX1954/MAX1957是一类通用、廉价、同步电流模式的脉宽调制(PWM) buck控制器。这些降压控制器适合那些对成本和尺寸要求比较苛刻的应用。

MAX1953工作在1MHz固定开关频率下,因此能够显著地降低外部元件尺寸和成本。另外,通过使用更小的输出电容可以获得出色的瞬态响应。MAX1953工作在3V至5.5V的低输入电压,产生高达10A的输出电流。提供可选择的电流限制来适合外部MOSFET的导通电阻,以优化成本和性能。输出电压在0.8V至0.86VIN之间可调。

对MAX1954而言,高端FET的漏极电压范围是3V至13.2V,不依赖于电源电压。它工作在300kHz的固定开关频率,提供高达25A的输出电流,且具有较高的效率。输出电压在0.8V至0.86VHSD之间可调。

MAX1957具有0.4V至0.86VIN的跟踪输出电压范围,具有源出和吸流能力,适合于诸如DDR总线终端、PowerPC®/ASIC/DSP内核供电等应用。MAX1957工作在3V至5.5V的输入电压范围、固定的300kHz开关频率。

MAX1953/MAX1954/MAX1957提供了一个COMP引脚,该引脚除了为误差放大器提供补偿以外,还可以被拉低,用来关断转换器。输入欠压锁定功能(UVLO)用来保证该器件在电源过低的情况下正常地工作,以防止外部功率MOSFET过热。内部数字软启动用来减小浪涌电流。MAX1953/MAX1954/MAX1957都采用微型10引脚µMAX封装。
MAX1953、MAX1954、MAX1957:功能框图 MAX1953、MAX1954、MAX1957:功能框图 放大+

关键特性

  • 低成本电流型控制器
  • 固定频率PWM
  • MAX1953
    • 1MHz开关频率
    • 小尺寸外部元器件,低成本
    • 可调的限制电流
  • MAX1954
    • 3V至13.2V输入电压
    • 25A输出电流能力
    • 93%的效率
    • 300kHz开关频率
  • MAX1957
    • 提供0.4V至0.86VIN的跟踪输出电压范围,具有3A的源出和吸流能力
  • 关断特性
  • 全部采用N沟道MOSFET设计,实现低成本
  • 无需检流电阻
  • 内置数字软启动
  • 热过载保护
  • 微小的10引脚µMAX封装

应用

  • 图形卡与视频卡
  • 低电压分布式电源
  • 微处理器核电源
  • PC与服务器
  • 打印机与扫描仪
  • 电信和网络

Pricing 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 and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX1953EVKIT: MAX1953/MAX1954评估板
产品可靠性报告: MAX1957.pdf 
型号   生产流程   工艺   样本量   不合格   FIT @ 25°C   FIT @ 55°C   Material Composition  

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5042MAX1953EVKIT MAX1953/MAX1954评估板