Features and Benefits

  • 6A PWM Step-Down Regulator with 95% Efficiency
  • 1MHz/500kHz Switching for Small External Components
  • 0.76in² Complete 6A Regulator Footprint
  • External Components' Height <3mm
  • ±1% Output Accuracy over Load and Line
  • Operate from 2.6V to 5.5V Supply
  • Operate from 2.5V Input with VCC at 3.3V/5V
  • Preset Output Voltage of 1.8V or 2.5V
  • Adjustable Output from 0.8V to 85% of Input
  • Voltage Margining: ±4% (MAX1945R) or ±9% (MAX1945S)
  • Synchronize to External Clock
  • SYNCOUT Provides 180-Degree Out-of-Phase Clock Output
  • All-Ceramic or Electrolytic Capacitor Designs

Product Details

The MAX1945R/MAX1945S high-efficiency pulse-width modulation (PWM) switching regulators deliver up to 6A of output current. The devices operate from an input supply range of 2.6V to 5.5V and provide selectable output voltages of 1.8V, 2.5V, and adjustable output voltages from 0.8V to 85% of the supply voltage. With VCC at 3.3V/5V, the input voltage can be as low as 2.25V. The MAX1945R/MAX1945S are ideal for on-board post-regulation applications. Total output voltage error is less than ±1% over load, line, and temperature.

The MAX1945R/MAX1945S operate at a selectable fixed frequency (500kHz or 1MHz) or can be synchronized to an external clock (400kHz to 1.2MHz). The high operating frequency minimizes the size of external components. The high bandwidth of the internal error amplifier provides excellent transient response. The MAX1945R/MAX1945S have internal dual N-channel MOSFETs to lower heat dissipation at heavy loads. Two MAX1945R/MAX1945Ss can operate 180 degrees out-of-phase of each other to minimize input capacitance. The devices provide output voltage margining for board-level testing. The MAX1945R provides a ±4% voltage margining. The MAX1945S provides a ±9% voltage margining.

The MAX1945R/MAX1945S are available in 28-pin TSSOP-EP packages and are specified over the -40°C to +85°C industrial temperature range. An evaluation kit is available to speed designs.

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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.

Evaluation Kits (1)

Product Recommendations

MAX1945 Companion Parts

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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.

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