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onsemi NCP81243 Dual Output Multi-Phase Controller

onsemi NCP81243 Dual Output Controller offers an optimized multi-phase buck solution for Intel IMVP8 compatible CPUs. The control system of the onsemi NCP81243 is based on dual-edge pulse-width modulation (PWM) and DCR current sensing. This design delivers an ultra-fast initial response to dynamic load events. In light load conditions, the onsemi NCP81243 can auto-frequency scale while still delivering excellent transient performance. By integrating differential-inductor DCR current sensing, true-differential voltage sensing, input voltage feed-forward, and adaptive-voltage positioning, the NCP81243 controller accurately regulates power for both desktop and notebook applications.

The NCP81243 controller includes five PWM drive signals. Designers can configure the PWM drive signals into multiple setups. Dual high-performance operational error amplifiers simplify loop compensation. Patented Dynamic Reference Injection ensures designers do not need to compromise between closed-loop transient response and Dynamic VID performance.

Features

  • Meets the Intel® IMVP8 specification
  • Current mode dual-edge modulation for fast initial response to transient loading
  • Dual high-performance operational error amplifiers
  • One digital soft start ramp for both rails
  • Dynamic reference injection
  • Accurate total summing current amplifier
  • DAC with droop feed-forward injection
  • Dual high impedance differential voltage and total current sense amplifiers
  • Phase-to-phase dynamic current balancing
  • Lossless DCR current sensing for current balancing
  • Summed compensated inductor current sensing for droop
  • True differential current balancing sense amplifiers for each phase
  • Adaptive voltage positioning (AVP)
  • 300kHz-1.4MHz switching frequency range
  • Startup into pre-charged loads while avoiding false overvoltage protection (OVP)
  • Pin programmable power saving phase shedding
  • Vin feed forward ramp slope
  • OVP and undervoltage protection (UVP)
  • Overcurrent protection (OCP)
  • Dual power good output with internal delays
  • Lead-free, halogen-free/BFR-free, and RoHS compliant

Applications

  • Desktop and notebook processors
  • Gaming
Đã phát hành: 2016-05-31 | Đã cập nhật: 2022-03-11