MAX17039GTN+

XX-XXXX; Rev 0; 7/09 Dual-Output, 3-Phase + 1 Phase Quick-PWM Controller for VR12/IMVP-7 The MAX17039 is a dual-output, step-down, constanton-time controller for VR12/IMVP-7 CPU core supplies. The controller consists of two high-current-switching power supplies for the CPU and GPU cores. The CPU regulator (regulator A) is a three-phase constant-on-time architecture. The optional 3rd phase is configured with an external MAX8791 or MAX17491 driver. The second GPU regulator (regulator B) is also a constant-on-time architecture with only single phase. Both regulators A and B include true differential voltage and current sensing to improve load-line and currentlimit accuracy. Switching frequencies are independently programmable, allowing 100kHz to 600kHz per phase operation. Output overvoltage protection (OVP), undervoltage protection (UVP), and thermal protection ensure effective and highly reliable operation. When any of these protection features detect a fault, the controller shuts down both channels. Features S Supports all Required IMVP-7 Functions S Three-Phase Quick-PWM™ CPU Core (Regulator A) Two Internal Drivers and One External Driver Active Overshoot Suppression Transient-Phase Overlap Mode Dynamic Phase Selection Phase-Good Fault Detection (Internal) S One-Phase Quick-PWM with Internal Driver (Regulator B) S Intel VR12/IMVP-7-Compliant 25MHz Serial Interface S 8-Bit IMVP-7 DAC S ±0.4% VOUT Accuracy Over Line, Load, and Temperature S Active Voltage Positioning with Programmable Gain S Accurate Lossless Current Balance S Accurate Droop and Current Limit Regulator A includes transient-phase overlap, which speeds up the response time, reducing the total output capacitance. Regulator A also includes active overshoot suppression to further reduce the required output decoupling capacitance. S Remote Output and Ground Sense Both controllers are fully compliant with Intel’s VR12/ IMVP-7 serial VID communication and control specifications. CPU and GPU outputs are controlled independently by writing the appropriate data into a function-mapped register file. A slew-rate controller allows controlled transitions between VID codes, controlled soft-start. The SVID interface also allows each regulator to be individually set into a low-power pulse-skipping state. Individual phases can be shut down based on the processors’ operating conditions to optimize efficiency. The MAX17039 is available in a lead-free, 56-pin, 7mm x 7mm TQFN package. S Drives Large Synchronous Rectifier MOSFETs S Power-Good Window Comparators (VR__READY) S Output Current Monitors (IMON_) S 4.5V to 26V Battery-Input Range S Programmable 100kHz to 600kHz Switching Frequency S External Thermal-Fault Detection (VR_HOT#) Output S Overvoltage, Undervoltage, and Thermal-Fault Protection S Soft-Start and Soft-Shutdown S Integrated Boost Switches S Low-Profile 56-Lead TQFN Package Applications Ordering Information VR12/IMVP-7 CPU Core Power Supplies Voltage-Positioned Step-Down Converters PART TEMP RANGE MAX17039GTN+ -40NC to +105NC Notebooks/Desktops/Servers Pin Configuration appears at end of data sheet. PINPACKAGE FEATURE 56 TQFN 3-phase + 1 phase (1 external driver) +Denotes a lead(Pb)-free/RoHS-compliant package. Quick-PWM is a trademark of Maxim Integrated Products, Inc. ________________________________________________________________ Maxim Integrated Products   1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. MAX17039 General Description