Dual-Phase, Quick-PWM Controllers for IMVP-6+/IMVP-6.5 CPU Core Power Supplies

The MAX17021/MAX17082/MAX17482 are 2/1-phase-interleaved Quick-PWM™ step-down VID power-supply controllers for notebook CPUs. True out-of-phase operation reduces input ripple current requirements and output- voltage ripple, while easing component selection and layout difficulties. The Quick-PWM control provides instantaneous response to fast load-current steps. Active voltage positioning reduces power dissipation and bulk output capacitance requirements and allows ideal positioning compensation for tantalum, polymer, or ceramic bulk output capacitors.

A slew-rate controller allows controlled transitions between VID codes, controlled soft-start and shutdown, and controlled exit from suspend. A thermistor-based temperature sensor provides a programmable thermal-fault output (active-low VRHOT). A current monitor output (IMON) provides an analog current output proportional to the power consumed by the CPU (MAX17082/MAX17482 only). Output undervoltage, overvoltage (MAX17021/MAX17082 only), and thermal protection shut the controller down when any of these faults are detected. A voltage-regulator power-OK (PWRGD) output indicates the output is in regulation. Additionally, the MAX17021/MAX17082/MAX17482 feature true differential current sense and a phase-good (PHASEGD) output that indicates a phase imbalance fault condition.

The MAX17021 supports the IMVP-6+ specification while the MAX17082/MAX17482 support the IMVP-6.5 requirements. The MAX17021/MAX17082/MAX17482 are available in a 5mm x 5mm, 40-pin TQFN package.

Applications

* Blade Servers * IMVP-6+/IMVP-6.5 Core Supply * Multiphase CPU Core Supply * Notebook/Desktop Computers * Voltage-Positioned, Step-Down Converters

* Single-/Dual-Phase, Quick-PWM Controllers

* MAX17021 IMVP-6+ (Montevina)

* MAX17082/MAX17482 IMVP-6.5 (Calpella)

* ±0.5% VOUT Accuracy Over Line, Load, and Temperature

* 7-Bit 0 to 1.50V VID Control

* Dynamic Phase Selection Optimizes Active/Sleep Efficiency

* Transient Phase Overlap Reduces Output Capacitance

* Integrated Boost Switches

* Active Voltage Positioning with Adjustable Gain

* Programmable 200kHz to 800kHz Switching Frequency

* Accurate Current Balance and Current Limit

* Adjustable Slew-Rate Control

* Power-Good, Clock Enable, and Thermal-Fault Outputs

* Phase Current Imbalance Fault Output

* Drives Large Synchronous Rectifier MOSFETs

* 4V to 26V Battery Input-Voltage Range

* Undervoltage and Thermal-Fault Protection

* Overvoltage Protection (MAX17021/MAX17082)

* Soft-Startup and Soft-Shutdown