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Maxim Integrated MAX16977

36V, 2A, 2.2MHz Step-Down Converter with Low Operating Current


TopologyBuck Converter
Input voltage3.5-36 V
Switching frequency2050-2350 kHz
Output 15 V / 2 A


The MAX16977 is a 2A, current-mode, step-down converter with an integrated high-side switch. The device is designed to operate with input voltages from 3.5V to 36V while using only 30FA quiescent current at no load. The switching frequency is adjustable from 1MHz to 2.2MHz by an external resistor and can be synchronized to an external clock. The output voltage is pin selectable to be 5V fixed or adjustable from 1V to 10V. The wide input voltage range along with its ability to operate at high dutycycle during undervoltage transients make the device ideal for automotive and industrial applications.The device operates in skip mode for reduced current consumption in light-load applications. Protection features include overcurrent limit, overvoltage, and thermal shutdown with automatic recovery. The device also featuresa power-good monitor to ease power-supply sequencing.The device operates over the -40NC to +125NC automotive temperature range, and is available in 16-pin TSSOP and TQFN (5mm x 5mm) packages with exposed pads.


  • Wide 3.5V to 36V Input Voltage Range
  • 42V Input Transients Tolerance
  • High Duty Cycle During Undervoltage Transients
  • 5V Fixed or 1V to 10V Adjustable Output Voltage
  • Integrated 2A Internal High-Side (70mI typ) Switch
  • Fast Load-Transient Response and Current-Mode Architecture
  • Adjustable Switching Frequency (1MHz to 2.2MHz)
  • Frequency Synchronization Input
  • 30µA Standby Mode Operating Current
  • 5µA Typical Shutdown Current
  • Spread Spectrum (Optional)
  • Overvoltage, Undervoltage, Overtemperature, and
  • Short-Circuit Protections

Typical applications

  • High-Voltage Input DC-DC Converters
  • Point-of-Load Applications
  • Industrial/Military
  • Automotive