Features and Benefits

  • 4V to 16V Input Voltage Range
  • 0.5V to 5.2V Output Voltage Range
  • Resistor Configurable Default VOUT
  • Two 3A Bucks (1Φ) or One 6A Buck (2Φ)
  • ±0.5% VOUT Accuracy (Default VOUT at 25°C)
  • 94% Peak Efficiency (7.6VIN, 3.3VOUT, 1MHz)
  • Auto SKIP/PWM and Low-Power Mode
  • 98% Max. Duty Cycle Dropout Operation
  • Programmable Soft-Start/Stop and Ramp-Up/Down Slew Rates
  • Pre-Biased Startup and Active Output Discharge
  • Programmable Inductor Peak Current Limits
  • 0.5/1.0/1.6MHz Nominal Switching Frequency
  • Spread-Spectrum Modulation
  • Internal/External Frequency Tracking
  • Dedicated EN, POK, and FPWM Pins
  • Undervoltage lockout (UVLO), Thermal Shutdown, and Short-Circuit Protection
  • High-Speed I2C I/F with 3-Slave Address Options
  • 30-WLP (2.51mm x 2.31mm) and 24-FC2QFN (3mm x 3mm) Packages
  • Less than 55mm2 Total Solution Size

Product Details

The MAX77540 is a high-efficiency step-down converter with two 3A switching phases. It uses an adaptive COT (constant on-time) current-mode control architecture and the two 3A switching phases can be configured as either one (2Φ, 6A) or two (1Φ, 3A each) outputs. Its wide input voltage range enables a direct conversion for sub-1V outputs from 3-cell Li+ batteries, USB PD, and 12VDC supply rails. The output voltages are preset with resistors and are further adjustable through an I2C-compatible interface. With 94% peak efficiency, low quiescent current, and compact solution size, the MAX77540 is ideal for battery powered, space-constraint equipment.

Programmable switching frequency, frequency tracking, and spread-spectrum allow easier system optimization for noise-sensitive applications. Dedicated EN, POK, and FPWM pins provide options for direct hardware control, while more programmable options, such as soft-start/stop and ramp-up/down slew-rates, are available through I2C. An array of built-in protections insures safe operation under abnormal operating conditions.


  • 2/3-Cell Li+ and USB-C Power Delivery Systems
  • Audio and Video Equipment
  • Microprocessors, field-programmable gate arrays (FPGAs), digital signal processors (DSPs),andapplication-specific integrated circuits (ASICs)
  • Networking and PCIe®/redundant array of inexpensive disks (RAID) Cards

Product Lifecycle icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits (1)

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EE-Sim® DC-DC Tool

The EE-Sim DC-DC Converter Tool uses your requirements to quickly create a complete power design including a schematic, BOM with commercially available parts, and time and frequency domain simulations. Your customized schematic can be downloaded for further analysis in the standalone EE-Sim OASIS Simulator , featuring SIMPLIS and SIMetrix SPICE engines.


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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.