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The MAX8702/MAX8703 dual-phase noninverting
MOSFET drivers are designed to work with PWM controller
ICs, such as the MAX8705/MAX8707, in notebook
CPU core and other multiphase regulators.
Applications can either step down directly from the battery
voltage to create the core voltage, or step down
from a low-voltage system supply. The single-stage conversion
method allows the highest possible efficiency,
while the 2-stage conversion at higher switching frequency
provides the minimum possible physical size.
Each MOSFET driver is capable of driving 3nF capacitive
loads with only 19ns propagation delay and 8ns
typical rise and fall times. Larger capacitive loads are
allowable but result in longer propagation and transition
times. Adaptive dead-time control helps prevent shoot-through
currents and maximizes converter efficiency.
The MAX8702/MAX8703 feature zero-crossing comparators
on each channel. When enabled, these comparators
permit the drivers to be used in pulse-skipping
operation, thereby saving power at light loads. A separate
shutdown control is also included that disables all
functions, drops quiescent current to 2µA, and sets DH
low and DL high.
The MAX8702 integrates a resistor-programmable temperature
sensor. An open-drain output (DRHOT-bar) signals
to the system when the local die temperature exceeds
the set temperature. The MAX8702/MAX8703 are available
in a thermally-enhanced 20-pin thin QFN package.
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(typ) On-Resistance and 5A (typ)
Drive Current
