MAX17428

1-Phase Quick-PWM Intel IMVP-6.5/GMCH Controllers

Single-Phase IMVP-6.5/GMCH Controllers

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製品情報

1-Phase Quick-PWM Controller
±0.5% V_OUT Accuracy Over Line, Load, and Temperature
7-Bit IMVP-6.5 DAC
IMVP-6.5 and GMCH Compliant
Active Voltage Positioning with Adjustable Gain
Accurate Droop and Current Limit
Remote Output and Ground Sense
Adjustable Output-Voltage Slew Rate
Power-Good Window Comparator
Current Monitor
Temperature Comparator
Drives Large Synchronous Rectifier FETs
2V to 26V Battery Input Range
Adjustable Switching Frequency (600kHz, max)
Output Overvoltage (MAX17028 Only)
Undervoltage and Thermal-Fault Protection
Soft-Startup and Soft-Shutdown
Internal Boost Diode

The MAX17028/MAX17428 are 1-phase Quick-PWM™ step-down VID power-supply controllers for Intel® notebook CPUs. 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.

The MAX17028/MAX17428 are intended for two different notebook CPU/GPU core applications: either bucking down the battery directly to create the core voltage, or else bucking down the +5V system supply. The single-stage conversion method allows these devices to directly step down high-voltage batteries for the highest possible efficiency. Alternatively, 2-stage conversion (stepping down the +5V system supply instead of the battery) at higher switching frequency provides the minimum possible physical size.

A slew-rate controller allows controlled transitions between VID codes. A thermistor-based temperature sensor provides programmable thermal protection. A current monitor provides an analog output current proportional to the processor load current.

The MAX17028/MAX17428 implement both the Intel IMVP-6.5 CPU core specifications (V3P3 = 3.3V), as well as the Intel GMCH graphics core specifications (V3P3 = GND). The MAX17028/MAX17428 are available in a 32-pin, 5mm x 5mm, TQFN package.

Applications