Texas Instruments' TPS40400 is a cost-optimized flexible synchronous buck controller that operates from a nominal 3 V to 20 V supply. This controller is an analog PWM controller that allows programming and monitoring via the PMBus interface. Flexible features found on this device include programmable soft-start time, programmable short circuit limit and programmable undervoltage lockout (UVLO).
An adaptive anti-cross conduction scheme is used to prevent shoot through current in the power FETs. Gate drive voltage is 6 V to better enhance the power FETs for reduced losses. Short circuit detection is done by sensing the voltage drop across the inductor or across a resistor placed in series with the inductor.