MAX1843

2.7A、1MHz、低电压、降压型稳压器,内置同步整流,TQFN封装

2.7A、1MHz、内置开关降压调节器


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说明

The MAX1843 constant-off-time, pulse-width modulated (PWM) step-down DC-DC converter is ideal for use in 5V and 3.3V to low-voltage conversion necessary in notebook and subnotebook computers. This device features an internal PMOS power switch and internal synchronous rectification for high efficiency and reduced component count. An external Schottky diode is not required. The internal 90mΩ power switch and 70mΩ nMOS synchronous-rectifier switch easily deliver continuous load currents up to 2.7A. The MAX1843 produces a preset +2.5V, +1.8V, or +1.5V output voltage or an adjustable output from +1.1V to VIN. It achieves efficiencies as high as 95%.

The MAX1843 uses a unique current-mode, constant-off-time, PWM control scheme, which includes Idle Mode™ to maintain high efficiency during light-load operation. The programmable constant-off-time architecture sets switching frequencies up to 1MHz, allowing the user to optimize performance trade-offs between efficiency, output switching noise, component size, and cost. The MAX1843 features an adjustable soft-start to limit surge currents during startup, a 100% duty-cycle mode for low dropout operation, and a low-power shutdown mode that disconnects the input from the output and reduces supply current below 1µA. The MAX1843 is available in a 28-pin TQFN package with an exposed backside pad.
MAX1843:典型工作电路 MAX1843:典型工作电路 放大+

关键特性

  • ±1% Output Accuracy
  • Up to 1MHz Switching Frequency
  • 95% Efficiency
  • Internal pMOS/nMOS Switches
    • 90mΩ/70mΩ On-Resistance at VIN = +4.5V
    • 110mΩ/80mΩ On-Resistance at VIN = +3V
  • Output Voltage
    • +2.5V, +1.8V, or +1.5V Pin Selectable
    • +1.1V to VIN Adjustable
  • +3V to +5.5V Input Voltage Range
  • 350µA Operating Supply Current
  • < 1µA Shutdown Supply Current
  • Programmable Constant-Off-Time Operation
  • Idle Mode Operation at Light Loads
  • Thermal Shutdown
  • Adjustable Soft-Start Inrush Current Limiting
  • 100% Duty Cycle During Low-Dropout Operation
  • Output Short-Circuit Protection
  • 28-Pin TQFN Package

应用

  • 5V或3.3V至低电压转换
  • 芯片组供电
  • CPU I/O环
  • 笔记本电脑和亚笔记本电脑

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.
产品可靠性报告: MAX1843.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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