1FEATURES
2• Renewable Energy Grade
• 110kHz,135kHz or 215kHz PWM Operating
Frequency
• Panel Mode Pin for Optional Bypass Switch
Control
• Programmable Maximum Power Point Tracking
• Photovoltaic Solar Panel Voltage and Current
Diagnostic
• Single Inductor Four Switch Buck-Boost
Converter Control
• I2C Interface for Communication
• Output Overvoltage Protection
• Over-Current Protection

PACKAGE
• TSSOP-28

DESCRIPTION
The SM72445 is a programmable MPPT controller
capable of controlling four PWM gate drive signals for
a 4-switch buck-boost converter. The SM72445 also
features a proprietary algorithm called Panel Mode
(PM) which allows for the panel to be connected
directly to the output of the power optimizer circuit
when the input to output voltage ratio is close to 1.
This provides an opportunity to optimize the efficiency
of the power optimizer when the load is naturally
matching the maximum power point of the panel.
Along with the SM72295 (Photovoltaic Full Bridge
Driver), it creates a solution for an MPPT configured
DC-DC converter with efficiencies up to 99.5% (when operating with dedicated PM switches). Integrated
into the chip is an 8-channel, 10 bit A/D converter
used to sense input and output voltages and currents,
as well as IC configuration. Externally programmable
values include maximum output voltage and current
as well as different settings for slew rate, soft-start
and Panel Mode.