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The MAX8720 step-down controller is intended for core
CPU DC-DC converters in notebook computers. It features
a dynamically adjustable output, ultra-fast transient
response, high DC accuracy, and the high efficiency
needed for leading-edge CPU core power supplies.
Maxim's proprietary Quick-PWM™ quick-response,
constant-on-time, PWM control scheme handles wide
input/output voltage ratios with ease and provides
100ns "instant-on" response to load transients while
maintaining a relatively constant switching frequency.
The output voltage can be dynamically adjusted through
the 6-bit digital-to-analog converter (DAC) over a 0.275V
to 1.850V range in 25mV steps. The MAX8720 has independent
four-level logic inputs for setting the suspend
voltage (S0-S1). Precision slew-rate control provides
"just-in-time" arrival at the new DAC setting, minimizing
surge currents to and from the battery. The internal DAC
of the MAX8720 is synchronized to the slew-rate clock
for improved operation under aggressive power management
of newer chipsets and operating systems that
can make incomplete mode transitions. Remote feedback
and ground-sense inputs allow easy compensation
for IR drops in PC board traces.
Single-stage buck conversion allows these devices to
directly step down high-voltage batteries for the highest
possible efficiency. Alternatively, two-stage conversion
(stepping down the 5V system supply instead of the
battery) at a higher switching frequency allows the minimum
possible physical size.
The MAX8720 is available in a 28-pin QSOP or 36-pin
6mm x 6mm thin QFN package.
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