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The MAX5073 is a dual-output DC-DC converter with
integrated high-side n-channel power MOSFETs. Each
output can be configured either as a buck converter or
a boost converter. The device is capable of operating
from a wide 5.5V to 23V input voltage range. Each output
is programmable down to 0.8V in the buck mode
and up to 28V in the boost mode with an output voltage
accuracy of ±1%. In the buck mode, converter 1 and
converter 2 can deliver 2A and 1A, respectively. The
output switching frequency of each converter can be
programmed from 200kHz to 2.2MHz to avoid harmonics
in a radio power supply or to reduce the size of the
power supply. Each output operates 180° out-of-phase
thus reducing input-capacitor ripple current, size, and
cost. A SYNC input facilitates external frequency synchronization.
Moreover, a CLKOUT output provides
out-of-phase clock signal with respect to converter 2,
allowing four-phase operation using two MAX5073 ICs
in master-slave configuration.
The MAX5073 includes an internal digital soft-start that
reduces inrush current, eliminates output-voltage overshoot,
and ensures monotonic rise in output voltage
during power-up. The device includes individual shutdown
and a power-good output for each converter.
Protection features include output short-circuit protection
for buck mode and maximum duty-cycle limit for
boost operation, as well as thermal shutdown.
The MAX5073 is available in a thermally enhanced 28-
pin thin QFN package that can dissipate 2.7W at +70°C
ambient temperature. The device is rated for operation
over the -40°C to +85°C extended operating temperature
range.
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