Special Note
For a detailed datasheet and other design support tools please contact VR@list.ti.com.

 

Description
The TPS53661 is a 6-Phase VR12.5/VR12 SVID compliant PWM controller with built-in PMBus interface to power the latest Intel CPU and DDR memory used in server systems. It supports advanced PMBus communication interface for device configurations and system telemetries. It also offers external pinstrapping option for configuration to increase programming flexibility.

 

The TPS53661 employs advanced control architecture D-CAP+ together with state-of-the-art non-linear control schemes (USR and OSR) to address stringent load transient conditions in modem microprocessors. Its Auto-Phase-Balance feature fundamentally solves beat frequency oscillation issues in high-frequency transient scenarios and ensures perfect phase current balance under any frequency spectrum. Such benefits enable less output capacitance and higher system reliability in operation.

 

The TPS53661 uses internal current sensing element from TI's proprietary Smart Power Stage (CSD95372B) to achieve industry benchmark current monitoring accuracy. Its internal control scheme has the intelligence to perform Dynamic Phase Shedding based on load current condition with programmable thresholds. This feature optimizes the efficiency across the entire load range with seamless transitions.

 

The TPS53661 incorporates all the necessary protection features with programmable thresholds through PMBus or pinstrapping. These protection features include UVLO, over-current, over-voltage, under-voltage and over-temperature. The advanced PMBus command set has the telemetry capability to report input and output voltage/current/power, temperature, and all fault conditions.

 

The TPS53661 is packaged in a space-saving and thermally enhanced WQFN 5x5-40L package and operates from -10 degC to 105degC.

 

Features
Intel® VR12.x Platform Serial VID (SVID) Compliant
1-, 2-, 3-, 4-, 5- or 6-Phase Operation
Full VR12.5 Platform Server Feature Set Including Digital Current Monitor and VR_Fault
Supports VR12.0/VR12.5 Platform Single Output
8-Bit DAC with 0.5-V to 2.5-V Output Range
Optimized Efficiency at Light and Heavy Loads
8 Independent Levels of Overshoot Reduction (OSR) and Undershoot Reduction (USR)
Driverless Configurations for Efficient High- Frequency Switching
Fully Compatible with TI Smart Power Stages
Accurate, Adjustable Voltage Positioning
300-kHz to 1-MHz Frequency Selections With Closed-loop Frequency Control
Patented AutoBalance™ Phase Balancing
Selectable 16-Level-Per-Phase Current Limit
Dynamic Phase Shedding With Programmable Current Threshold
PMBus™ System Interface for Telemetry of Voltage, Current, Power, Temperature, and Fault Conditions
Programmable VID by PMBus
Disable SVID by PMBus for DDR Mode
Programmable Load Line by PMBus
Configurable With Non-Volatile Memory (NVM) or Resistor Pin Strap
Conversion Voltage Range: 4.5 V to 17 V
Small 5 mm × 5 mm, 40-Pin QFN Package

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