1. Products
  2. Power Management
  3. Switching Regulators
  4. Step-Down (Buck) Regulators
  5. Multiple Output Buck Regulators
  6. MAX1540A


Features and Benefits

  • Inductor-Saturation Protection
  • Accurate Differential Current-Sense Inputs
  • Dual Ultra-High-Efficiency Quick-PWMs with 100ns Load-Step Response
  • MAX1540A
    • 1.8V/1.2V Fixed or 0.7V to 5.5V Adjustable Output (OUT1)
    • 2.5V/1.5V Fixed or 0.7V to 5.5V Adjustable Output (OUT2)
    • Fixed 5V, 100mA Linear Regulator
  • MAX1541
    • External Reference Input (REFIN1)
    • Dynamically Selectable Output Voltage—0.7V to 5.5V (OUT1)
    • 2.5V/1.8V Fixed or 0.7V to 5.5V Adjustable Output (OUT2)
    • Optional Power-Good and Fault Blanking During Transitions
    • Fixed 5V or Adjustable 100mA Linear Regulator
  • 1% VOUT Accuracy over Line and Load
  • 2V to 28V Battery Input Range
  • 170kHz to 620kHz Selectable Switching Frequency
  • Overvoltage/Undervoltage-Protection Option
  • 1.7ms Digital Soft-Start
  • Drives Large Synchronous-Rectifier FETs
  • 2V ±0.7% Reference Output
  • Separate Power-Good Window Comparators

Product Details

The MAX1540A/MAX1541 dual pulse-width modulation (PWM) controllers provide the high efficiency, excellent transient response, and high DC-output accuracy necessary for stepping down high-voltage batteries to generate low-voltage chipset and RAM power supplies in notebook computers.

The Maxim proprietary Quick-PWM™ controllers are free running, constant on-time with input feed forward. This configuration provides ultra-fast transient response, wide input-output (I/O) differential range, low supply current, and tight load-regulation characteristics. The controllers can accurately sense the inductor current across an external current-sense resistor in series with the output to ensure reliable overload and inductor saturation protection. Alternatively, the controllers can use the synchronous rectifier itself or lossless inductor current-sensing methods to provide overload protection with lower power dissipation.

For a single step-down PWM controller with inductor-saturation protection, external-reference input voltage, and dynamically selectable output voltages, refer to the MAX1992/MAX1993 data sheet.


  • 0.7V to 5.5V Supply Rails
  • Active Termination Buses (MAX1541)
  • Core/IO Supplies as Low as 0.7V
  • CPU/Chipset/GPU with Dynamic Voltage Cores
  • DDR Memory Termination (MAX1541)
  • Notebook Computers
  • Supplies (MAX1541)

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
MAX1540AETJ+ Material Declaration Reliability Data 32-LFCSP-5X5X0.75
MAX1540AETJ+T Material Declaration Reliability Data 32-LFCSP-5X5X0.75
Wafer Fabrication Data

Sample & Buy

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Lead Times

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