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.
Key Features
Applications/Uses
1-Phase Quick-PWM Controller
±0.5% VOUT Accuracy Over Line, Load, and
Temperature
