Low Noise, Fast Transient Step-Down Converter: AAT2146

Source: Skyworks Solutions, Inc.

Low Noise, Fast Transient Step-Down Converter: AAT2146

This step-down converter has 2.7V to 5.5V input voltage range, with output voltage as low as 0.6V. It’s ideal for applications involving USB devices, cellular phones, PDAs and handheld computers, digital cameras, handheld instruments, and microprocessor/DSP Core/IO Power.

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The AAT2146 Low Noise, Fast Transient Step-Down Converter has been optimized to react quickly to load variations, and incorporates a unique low noise architecture to reduce ripple and spectral noise. This converter is available in fixed voltage versions with internal feedback and a programmable version with external feedback resistors. It’s been designed to maintain high efficiency throughout the operating range, which is critical for portable applications.


  • VIN Range: 2.7V to 5.5V
  • Low Noise Light Load Mode
  • Low Ripple PWM Mode
  • VOUT Fixed or Adjustable from 0.6V to VIN
  • 37μA No Load Quiescent Current
  • Up to 98% Efficiency
  • 600mA Max Output Current
  • 2MHz Switching Frequency
  • 150μs Soft Start
  • Fast Load Transient
  • Over-Temperature Protection
  • Current Limit Protection
  • 100% Duty Cycle Low-Dropout Operation
  • <1μA Shutdown Current
  • SC70JW-8 Package
  • Temperature Range: -40°C to +85°C

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