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VRM 8.2/3/4 Buck Controller With Two Linear Controllers

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Part Details
  • Active Voltage Positioning with Gain and Offset Adjustment
  • Optimal Compensation for Superior Load Transient Response
  • 5-Bit Digitally Programmable 1.3 V to 3.5 V Output
  • Dual N-Channel Synchronous Driver
  • Two Onboard Linear Regulator Controllers
  • Total Output Accuracy 61% Over Temperature
  • VRM 8.2, VRM 8.3 and VRM 8.4-Compliant
  • High Efficiency, Current-Mode Operation
  • Short Circuit Protection
  • Overvoltage Protection Crowbar
    Protects Microprocessors, with No
    Additional External Components
  • Power Good Output
  • TSSOP-20 Package
Additional Details
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The ADP3155 is a highly efficient synchronous buck switching regulator controller optimized for converting the 5 V main supply into the core supply voltage required the Pentium III and other high performance processsors. The ADP3155 uses an internal 5-bit DAC to read a voltage identification (VID) code directly from the processor, which is used to set the output voltage between 1.3 V and 3.5 V. The ADP3155 uses a current mode, constant off-time architecture to drive 2 external N-channel MOSFETs at a programmable switching frequency which can be optimized for size and efficiency. It also uses a unique supplemental regulation technique called active voltage positioning to enhance load transient performance.

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