Current Mode PWM Controller 48-Pin TQFN EP

The MAX8810 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 MAX8810 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 powergood 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 MAX8810 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 MAX8810 operates as a single-chip, 2-phase solution with integrated drivers. It also provides a 3rdphase 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.

• 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
• 0.3O/0.85O Low-Side, 0.8O/1.1O High-Side Drivers (typ)
• 40-Pin and 48-Pin Thin QFN Packages