DC/DC Controller Supports Input Voltage Ranges from 4.5V to 20V
Texas Instruments introduced a synchronous buck controller that simplifies power management design of LCD TVs and IP set-top boxes that use digital signal processors (DSPs) and FPGAs. The TPS40195 for 4.5V to 20V input systems, uses the input voltage available for power conversion as its bias supply, eliminating the need for additional voltages to power the IC. The device, which comes in a 16-pin TSSOP package, also can switch 180° out of phase when the bi-directional synchronization pin is used as an output to other buck controllers. This reduces bulk capacitance and saves board space when using 5V and 12V power supplies. The TPS40195 also lowers electromagnetic interference (EMI) when the pin is used as an input connected to a master clock. The controller provides current detection at low duty cycles and limits energy into the system with an over-current sensing feature for both high- and low-side MOSFETs. The TPS40195 also supports control and protection features, such as shutdown control, power good output, adjustable under-voltage lockout, selectable digital soft start, programmable closed-loop soft start and short-circuit protection. Power system designers can optimize the TPS40195 for efficiency or solution size by programming the switching frequency from 250 kHz to 600 kHz, or the controller can be synchronized via an external clock.