概览

优势和特点

  • Low Operating IQ: 12μA (14V VIN to 3.3V VOUT)
  • Wide Input Voltage Range: 4.5V to 40V
  • Fixed 3.3V Regulated Output Voltage
  • Spread Spectrum Operation
  • RSENSE or DCR Current Sensing
  • Programmable Fixed Frequency (100kHz to 3MHz)
  • Phase-Lockable Frequency (100kHz to 3MHz)
  • Selectable Continuous, Pulse-Skipping, or Low Ripple Burst Mode® Operation at Light Loads
  • Low Shutdown IQ: 1.2μA
  • Thermally Enhanced 16-Lead 3mm × 3mm QFN Package
  • AEC-Q100 Qualified for Automotive Applications

产品详情

The LTC7803-3.3 is a high performance synchronous step-down DC/DC switching regulator controller that drives an all N-channel power MOSFET stage. Synchronous rectification increases efficiency, reduces power losses and eases thermal requirements. A constant frequency current mode architecture allows a phase-lockable switching frequency of up to 3MHz. The LTC7803‑3.3 operates from a wide 4.5V to 40V input supply range and regulates the output to a fixed 3.3V voltage using an internal feedback resistor divider.

The very low no-load quiescent current extends operating runtime in battery powered systems. OPTI-LOOP® compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The MODE pin selects among Burst Mode operation, pulse-skipping mode, or continuous inductor current mode at light loads.

The LTC7803-3.3 additionally features spread spectrum operation which significantly reduces the peak radiated and conducted noise on both the input and output supplies, making it easier to comply with electromagnetic interference (EMI) standards.

APPLICATIONS

  • Automotive and Transportation
  • Industrial
  • Military/Avionics
  • Telecommunications

产品生命周期 icon-recommended 预发布

本产品为新品,工程验证可能仍在进行中。我们正在准备量产,数量可能有限,设计规格可能会改变。

工具及仿真模型

LTspice

LTspice®是一款强大高效的免费仿真软件、原理图采集和波形观测器,为改善模拟电路的仿真提供增强功能和模型。

LTspice

LTspice中提供以下器件型号:

LTC7803

LTpowerCAD

LTpowerCAD®是一种电源设计程序,它选择功率级元件,提供详细效率信息,显示快速环路波特图稳定性和负载瞬态分析,并可导出至LTspice进行仿真。

LTPowerCAD

LTpowerCAD中提供以下器件的设计工具:

LTC7803

设计资源

ADI始终把满足您可靠性水平的产品放在首要位置。我们通过在所有产品、工艺设计和制造过程中引入高质量和可靠性检查实践这一承诺。发运的产品实现“零缺陷”始终是我们的目标。

样片申请及购买

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