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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.