SLVSB16E November 2011 – December 2015 TPS43340-Q1
PRODUCTION DATA.
The TPS43340-Q1 is designed to operate from an input voltage up to 40 V for the buck controllers (Buck1, Buck2). The buck converter (Buck3) accepts input voltages up to 10 V; so in many applications, the output of Buck1 or Buck2 is used to supply it. The linear regulator accepts up to 40 V; however, for power dissipation reasons, TI advises using lower supply voltages. Ensure that the supply for all inputs is well regulated. Furthermore, if the supply voltage in the application is likely to reach negative voltage (for example, reverse battery), a forward diode must be placed at the input of the supply, where GPULL-pin can be used to bypass the diode with an external FET to reduce the voltage drop and power dissipation. For the VIN pin, place a ceramic capacitor or a set of ceramic capacitors close to the pin and add more capacitance as required. Consider capacitance derating for aging, temperature, and DC bias. The PowerPAD package, which offers an exposed thermal pad to enhance thermal performance, must be soldered to the copper landing on the PCB for optimal performance.