Five-rail automotive PMIC in a 4x4 mm QFN
The Texas Instruments TPS65053IRGERQ1 is an automotive-grade power management IC integrating two synchronous step-down buck converters and three low-dropout linear regulators in a single 24-VQFN package measuring 4x4 mm. Rated to AEC-Q100, it accepts a 2.5V to 6V supply rail — directly from a vehicle battery or a pre-regulated bus — and delivers five independent output rails with a combined supervisor for system reset monitoring.
Output rail budget and layout implications
Output 1 sources up to 1 A from 0.6V to 6V, output 2 delivers 600 mA over the same voltage range, and the three LDOs each provide 400 mA from 1V to 3.6V. The 2.25 MHz switching frequency lets the designer use smaller inductors and ceramic output capacitors, shrinking the total power-stage footprint — a real advantage when the board area is constrained by the module housing. With the bucks running at 2.25 MHz, keep the switch-node loop tight to the inductor and input capacitor to minimise radiated emissions — a common gotcha in automotive EMC testing.
For engine-bay or brake-system zones that see sustained 105°C or 125°C ambient, the LP873244RHDTQ1 peer extends to 125°C — but trades two LDOs for a sequencer and a different output count.