MAX1717

Dynamically Adjustable, Synchronous Step-Down Controller for Notebook CPUs

Industry's First Single-Chip Solution to Power Intel SpeedStep CPUs


Please check latest availability status for a specific part variant.

Description

The MAX1717 step-down controller is intended for core CPU DC-DC converters in notebook computers. It features a dynamically adjustable output, ultra-fast transient response, high DC accuracy, and high efficiency needed for leading-edge CPU core power supplies. Maxim's proprietary Quick-PWM™ quick-response, constant-on-time PWM control scheme handles wide input/output voltage ratios with ease and provides 100ns Instant-on" response to load transients while maintaining a relatively constant switching frequency.

The output voltage can be dynamically adjusted through the 5-bit digital-to-analog converter (DAC) inputs over a 0.925V to 2V range. A unique feature of the MAX1717 is an internal multiplexer (mux) that accepts two 5-bit DAC settings with only five digital input pins. Output voltage transitions are accomplished with a proprietary precision slew-rate control that minimizes surge currents to and from the battery while guaranteeing "just-in-time" arrival at the new DAC setting.

High DC precision is enhanced by a two-wire remote-sensing scheme that compensates for voltage drops in the ground bus and output voltage rail. Alternatively, the remote-sensing inputs can be used together with the MAX1717's high DC accuracy to implement a voltage-positioned circuit that modifies the load-transient response to reduce output capacitor requirements and full-load power dissipation.

Single-stage buck conversion allows these devices to directly step down high-voltage batteries for the highest possible efficiency. Alternatively, two-stage conversion (stepping down the +5V system supply instead of the battery) at a higher switching frequency allows the minimum possible physical size.

The MAX1717 is available in a 24-pin QSOP package.
MAX1717: Minimal Operating Circuit MAX1717: Minimal Operating Circuit Enlarge+

Key Features

  • Quick-PWM Architecture
  • ±1% VOUT Accuracy Over Line and Load
  • 5-Bit On-Board DAC with Input Mux
  • Precision-Adjustable VOUT Slew Control
  • 0.925V to 2V Output Adjust Range
  • Supports Voltage-Positioned Applications
  • 2V to 28V Battery Input Range
  • Requires a Separate +5V Bias Supply
  • 200/300/550/1000kHz Switching Frequency
  • Over/Undervoltage Protection
  • Drives Large Synchronous-Rectifier FETs
  • 700µA (typ) ICC Supply Current
  • 2µA (typ) Shutdown Supply Current
  • 2V ±1% Reference Output
  • VGATE Transition-Complete Indicator
  • Small 24-Pin QSOP Package

Applications/Uses

  • 2-Cell to 4-Cell Li+ Battery to CPU Core Supply Converters
  • 5V to CPU Core Supply Converters
  • Notebook Computers with Intel SpeedStep® or Other Dynamically Adjustable Processors

MAX1717EVKIT: Evaluation Kit for the MAX1717

Additional Resources

Maxim Products for Intel IMVP
Request Reliability Report for: MAX1717 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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