概览

优势和特点

  • Silent Switcher®2 Architecture
    • Ultralow EMI Emissions on Any PCB
    • Eliminates PCB Layout Sensitivity
    • Internal Bypass Capacitors Reduce Radiated EMI
    • Optional Spread Spectrum Modulation
  • High Efficiency at High Frequency
    • Up to 95.5% Efficiency at 1MHz, 12VIN to 5VOUT
    • Up to 93% Efficiency at 2MHz, 12VIN to 5VOUT
  • Wide Input Voltage Range: 3V to 42V
  • 15A Output Current
  • Low Quiescent Current Burst Mode® Operation
    • 100μA IQ Regulating 12VIN to 5VOUT
    • Output Ripple < 10mVP-P
  • External Compensation: Fast Transient Response and Current Sharing
  • Fast Minimum Switch On-Time: 25ns
  • Low Dropout Under All Conditions: 35mV at 1A
  • Forced Continuous Mode
  • Adjustable and Synchronizable: 200kHz to 2.2MHz
  • Output Soft-Start and Power Good
  • Safely Tolerates High Reverse Current
  • Small 36-Lead 7mm × 4mm LQFN Package
  • AEC-Q100 Qualification in Progress

产品详情

The LT8648S synchronous step-down regulator features second generation Silent Switcher architecture designed to minimize EMI emissions while delivering high efficiency at high switching frequencies. This includes the integration of input and boost capacitors to optimize all the fast current loops inside and make it easy to achieve advertised EMI performance by reducing layout sensitivity. This performance makes the LT8648S ideal for noise sensitive applications and environments.

The fast, clean, low overshoot switching edges enable high efficiency operation even at high switching frequencies, leading to a small overall solution size. Peak current mode control with a 25ns minimum on-time allows high step down ratios even at high switching frequencies. External compensation via the VC pin allows for fast transient response at high switching frequencies. The VC pin also enables current sharing and a CLKOUT pin enables synchronizing other regulators to the LT8648S.

Burst Mode operation enables low standby current consumption, forced continuous mode can control frequency harmonics across the entire output load range, or spread spectrum operation can further reduce EMI emissions. Soft-start and tracking functionality is accessed via the SS pin, and an accurate input voltage UVLO threshold can be set using the EN/UV pin.

Applications

  • Automotive and Industrial Supplies
  • General Purpose Step-Down

All registered trademarks and trademarks are the property of their respective owners. Protected by U.S. patents, including 8823345.

产品生命周期 icon-recommended 推荐新设计使用

本产品已上市。数据手册包含所有最终性能规格和工作条件。ADI公司推荐新设计使用这些产品。

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

Models for the following parts are available in LTspice:

LT8648S

LTpowerCAD

LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.

LTPowerCAD

Design tools for the following parts are available in LTpowerCAD:

LT8648S

设计资源

ADI始终把满足您最高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。

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