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VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers

Peak Current-Mode Control Combined with Maxim's Proprietary Rapid Active Current Averaging (RA²) for Excellent Current-Sharing Accuracy, Fast, Accurate Voltage Positioning, and Superior Transient Response

Product Details

Key Features

Simplified Block Diagram

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Key Features

  • VRD11/VRD10 and K8 Rev F Compliant
  • ±0.35% Initial Output Voltage Accuracy
  • Dual Integrated Drivers with Integrated Bootstrap Diodes
  • Up to 26V Input Voltage
  • Adaptive Shoot-Through Protection
  • Soft-Start, Soft-Stop, VRREADY Output
  • Fast Load Transient Response
  • Individual Phase, Fully Temperature-Compensated Cycle-by-Cycle Average Current Limit
  • Current Foldback at Short Circuit
  • Voltage Positioning or Integral Feedback
  • Differential Remote Voltage Sensing
  • Programmable Positive and Negative Offset Voltages
  • 150kHz to 1.2MHz Switching Frequency per Phase
  • NTC-Based, Temperature-Independent Load Line
  • Precise Phase Current Sharing
  • Programmable Thermal-Monitoring Output (VRHOT)
  • 6A Peak MOSFET Drivers
  • 0.3Ω/0.85Ω Low-Side, 0.8Ω/1.1Ω High-Side Drivers (typ)
  • 40-Pin and 48-Pin Thin QFN Packages

Applications/Uses

  • Desknotes and LCD PCs
  • Desktop PCs
  • Servers, Workstations
  • Voltage-Regulator Modules

Description

The MAX8809A/MAX8810A synchronous, 2-/3-/4-phase, step-down, current-mode controllers with integrated dual-phase MOSFET drivers provide flexible solutions that fully comply with Intel® VRD11/VRD10 and AMD K8 Rev F CPU core supplies. The flexible design supplies load currents up to 150A for low-voltage CPU core power requirements.

A tri-state SEL input is available to configure the VID logic for either the Intel VRD11/VRD10 or AMD K8 Rev F applications. An enable input (EN) is available to disable the IC. True-differential remote output-voltage sensing enables precise regulation at the load by eliminating the effects of trace impedance in the output and return paths. A high-accuracy DAC combined with precision current-sense amplifiers and droop control enable the MAX8809A/MAX8810A to meet the most stringent tolerance requirements of new-generation high-current CPUs. These ICs use either integral or voltage-positioning feedback control to achieve high output-voltage accuracy.

The COMP input allows for either positive or negative voltage offsets from the VID code voltage. A power-good signal (VRREADY) is provided for startup sequencing and fault annunciation. The SS/OVP pin enables the programming of the soft-start period, and provides an indication of an overvoltage condition. A soft-stop feature prevents negative voltage spikes on the output at turn-off, eliminating the need for an external Schottky clamp diode.

The MAX8809A/MAX8810A incorporate a proprietary "rapid active average" current-mode control scheme for fast and accurate transient-response performance, as well as precise load current sharing. Either the inductor DCR or a resistive current-sensing element is used for current sensing. When used with DCR sensing, rapid active current averaging (RA²) eliminates the tolerance effects of the inductance and associated current-sensing components, providing superior phase current matching, accurate current limit, and precise load-line.

The MAX8809A operates as a single-chip, 2-phase solution with integrated drivers. It also provides a 3rd-phase PWM output and easily supports 3-phase design by adding the MAX8552 high-performance driver. The MAX8810A enables up to 4-phase designs by adding the MAX8523 high-performance dual driver for a compact 2-chip solution.

Simplified Block Diagram

MAX8809A, MAX8810A: Block Diagrams MAX8809A, MAX8810A: Block Diagrams 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 .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.