MAX1677

紧凑的、高效率、双输出、升压型和LCD偏置DC-DC转换器

逻辑电路与LCD电源方案,仅消耗35µA的电源电流,外部元件数最少


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说明

The MAX1677 is a compact, high-efficiency, dual-output boost converter for portable devices needing two regulated supplies, typically for logic and liquid crystal displays (LCDs). Operation with inputs as low as 0.7V allows the MAX1677 to accept 1, 2, or 3-cell alkaline, NiCd, or NiMH batteries as well as 1-cell lithium-ion batteries. The device requires no external FETs and can maintain regulation while consuming only 20µA, making it ideal for hand-held pen-input and PDA devices operating with low-current "sleep" states.

The MAX1677's primary regulator supplies up to 350mA at either a factory-preset 3.3V or an adjustable 2.5V to 5.5V output. On-chip synchronous rectification provides efficiencies up to 95%. 300kHz (or externally clocked) pulse-width-modulation (PWM) operation is particularly suitable for applications needing low noise, such as those with wireless features. The primary converter also features pin-selectable pulse-frequency-modulation (PFM) operation that consumes only 20µA. A 1µA shutdown state also minimizes battery drain.

The MAX1677's secondary step-up converter supplies up to +28V or -28V for LCD bias, varactor tuning, or other high-voltage, low-current functions. Other MAX1677 features include precision reference, logic control inputs for both regulators, and an uncommitted comparator for low-battery detection or a reset function. The MAX1677 is supplied in Maxim's compact 16-pin QSOP package, which occupies no more space than a standard SO-8.
MAX1677:典型工作电路 MAX1677:典型工作电路 放大+

关键特性

  • No External FETs Required
  • Main Output
    • Up to 350mA for Logic Supply
    • Fixed 3.3V or Adjustable (2.5V to 5.5V)
    • Synchronous Rectification for High Efficiency (up to 95%)
    • 300kHz (200kHz to 400kHz Synchronizable)
    • Fixed-Frequency PWM Operation
  • Secondary Output
    • Up to +28V or -28V for LCD Bias
    • Programmable Current Limit
  • 0.7V to 5.5V Input Voltage Range
  • 20µA Quiescent Current
  • 1µA Shutdown Current
  • Low-Battery Comparator
  • Small 16-Pin QSOP Package

应用

  • 手持式终端
  • PDA
  • 便携式仪表
  • 便携电话

请查看具体的参数规格 Multifunction PMICs (83)


Part NumberVIN
(V)
VIN
(V)
# Step-Up Outputs
(min)(max)
MAX1677 0.75.52

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。

技术资料

应用笔记 1864 Regulated Dual Voltages Control STN-LCD Contrast
申请可靠性报告: MAX1677 
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
应用笔记 1864 Regulated Dual Voltages Control STN-LCD Contrast
类型 编号 标题
评估板1938MAX1677EVKIT MAX1677评估板