The TPS40400RHLR is a flexible Synchronous Buck Controller operates from a nominal 3 to 20V supply. This analog PWM controller that allows programming and monitoring through 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 6V to better enhance the power FETs for reduced losses. Short circuit detection occurs by sensing the voltage drop across the inductor or across a resistor placed in series with the inductor. A PMBus programmable threshold is compared to this voltage and is used to detect overcurrent. When the overcurrent threshold is reached, a pulse by pulse current limit scheme is used to limit the current to acceptable levels.
PMBus enabled analog controller
Remote voltage sense amplifier
Internal 6V Regulator and gate drive
Programmable overcurrent protection
Inductor resistance or series resistance used for current sensing
Powergood indicator
Thermal shutdown
Programmable soft-start
Internal bootstrap diode
Pre-bias output safe
Green product and no Sb/Br
Device has limited built-in ESD protection, leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
