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Quick-PWM Slave Controller with Driver Disable for Multiphase, DC-DC Converter

Slave Controller with Driver Disable for Multiphase DC-DC Converters

Product Details

Key Features

Simplified Block Diagram

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Key Features

  • Quick-PWM Slave Controller
  • Precise, Active Current Balance (±1.25mV )
  • Driver Disable Improves Light Load Efficiency
  • Accurate, Adjustable Current-Limit Threshold
  • Optimized for Low-Output Voltages (≤ 2V)
  • 4V to 28V Battery Input Range
  • Selectable 200kHz/300kHz/550kHz Switching Frequency
  • Drive Large Synchronous-Rectifier MOSFETs
  • 525µA (typ) ICC Supply Current
  • 20µA Standby Supply Current
  • Compact 20-Pin 5mm x 5mm QFN and Thin QFN Packages

Applications/Uses

  • CPU Core Supplies
  • Notebook Computers
  • Servers/Desktop Computers
  • Single-Stage (BATT to VCORE) Converters
  • Two-Stage (+5V to VCORE) Converters

Description

The MAX1980 step-down slave controller is intended for low-voltage, high-current, multiphase DC-DC applications. The MAX1980 slave controller can be combined with any of Maxim's Quick-PWM™ step-down controllers to form a multiphase DC-DC converter. Existing Quick-PWM controllers, such as the MAX1718, function as the master controller, providing accurate output-voltage regulation, fast transient response, and fault protection features. Synchronized to the master's low-side gate driver, the MAX1980 includes the Quick-PWM constant on-time controller, gate drivers for a synchronous rectifier, active current balancing, and precision current-limit circuitry.

The MAX1980 provides the same high-efficiency, ultra-low duty factor capability, and excellent transient response as other Quick-PWM controllers. The MAX1980 differentially senses the inductor currents of both the master and the slave across current-sense resistors. These differential inputs and the adjustable current-limit threshold derived from an external reference allow the slave controller to accurately balance the inductor currents and provide precise current-limit protection. The MAX1980's dual-purpose current-limit input also allows the slave controller to automatically enter a low-power standby mode when the master controller shuts down.

The MAX1980 features a driver-disable mode that forces both gate drivers (DL and DH) low. While the MAX1980's drivers are disabled, the master controller can operate in low-power skip mode, improving light-load efficiency. Additionally, the MAX1980 includes selectable trigger polarity, allowing the slave controller to trigger on the rising (out-of-phase) or falling (in-phase) edge of the master's low-side gate driver. Out-of-phase operation staggers the master and slave's on-times, reducing the input ripple current and consequently the number of input capacitors. The MAX1980 also features a selectable 200kHz/300kHz/550kHz switching frequency. The MAX1980 is available in compact 20-pin 5mm x 5mm QFN and thin QFN packages.

Simplified Block Diagram

MAX1980: Typical Operating Circuit MAX1980: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .