The TPS7H4001-SP is designed to operate from an input voltage supply range between 3 V and 7 V. This supply voltage must be well regulated. Power supplies must be well bypassed for proper electrical performance. This includes a minimum of one 4.7 µF (after de-rating) ceramic capacitor, type X5R or better from PVIN to GND, and from VIN to GND. Additional local ceramic bypass capacitance may be required in systems with small input ripple specifications, as well as additional bulk capacitance if the TPS7H4001-SP device is located more than a few inches away from its input power supply. Bypass capacitors should be placed as close as possible to the input pins and have a low impedance path to GND.

Larger values of bypass capacitance will improve the response to radiation induced transients. The TPS7H4001-SP Evaluation Module uses 6 × 22-µF capacitors in addition to 2 × 470-µF capacitors in parallel on the PVIN input. In systems with an auxiliary power rail available, the power stage input, PVIN, and the analog power input, VIN, may operate from separate input supplies.