MAX1637

微型、低电压、高精度降压型控制器

低电压、高精度降压控制器,用于便携式CPU供电


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说明

The MAX1637 synchronous, buck, switch-mode power-supply controller generates the CPU supply voltage in battery-powered systems. The MAX1637 is a stripped-down version of the MAX1636 in a smaller 16-pin QSOP package. The MAX1637 is intended to be powered separately from the battery by an external bias supply (typically the +5V system supply) in applications where the battery exceeds 5.5V. The MAX1637 achieves excellent DC and AC output voltage accuracy. This device can operate from a low input voltage (3.15V) and delivers the excellent load-transient response needed by upcoming generations of dynamic-clock CPUs.

Using synchronous rectification, the MAX1637 achieves up to 95% efficiency. Efficiency is greater than 80% over a 1000:1 load-current range, which extends battery life in system-suspend or standby mode. Excellent dynamic response corrects output load transients caused by the latest dynamic-clock CPUs within five 300kHz clock cycles. Powerful 1A on-board gate drivers ensure fast external N-channel MOSFET switching.

The MAX1637 features a logic-controlled and synchronizable, fixed-frequency, pulse-width-modulation (PWM) operating mode. This reduces noise and RF interference in sensitive mobile-communications and pen-entry applications. Asserting the SKIP-bar pin enables fixed-frequency mode, for lowest noise under all load conditions. For a stand-alone device that includes a +5V VL linear regulator and low-dropout capabilities, refer to the MAX1636 data sheet.
MAX1637:典型工作电路 MAX1637:典型工作电路 放大+

关键特性

  • ±2% DC Accuracy
  • 0.1% (typ) DC Load Regulation
  • Adjustable Switching Frequency to 350kHz
  • Idle Mode™ Pulse-Skipping Operation
  • 1.10V to 5.5V Adjustable Output Voltage
  • 3.15V Minimum IC Supply Voltage (at VCC pin)
  • Internal Digital Soft-Start
  • 1.1V ±2% Reference Output
  • 1µA Total Shutdown Current
  • Output Overvoltage Crowbar Protection
  • Output Undervoltage Shutdown (foldback)
  • Tiny 16-Pin QSOP Package

应用

  • 手持终端、PDA
  • 笔记本电脑
  • 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.
申请可靠性报告: MAX1637 
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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