500 mA fixed 5V rail with low dropout
The TPS74550PQWDRVRQ1: This is a single-output positive LDO delivering a fixed 5 V at up to 500 mA. The 95 mV maximum dropout at full load means the input rail can dip to 5.095 V before the output falls out of regulation — useful when the upstream supply is a 5.5 V bus that sags under transient load.
PSRR profile and power-supply rejection
PSRR is 57 dB at 1 kHz, dropping to 35 dB at 1 MHz. If the 5 V rail comes from a switching converter switching at 400 kHz, expect about 40 dB of rejection at that frequency — enough to attenuate a 100 mV ripple to roughly 1 mV at the output. For noise-sensitive analog front-ends, a post-filter may still be needed above 1 MHz.
Automotive temperature range and qualification
The part is PPAP-ready for tier-1 automotive supply chains, with the full qualification package available from Texas Instruments.
Package and layout considerations
Housed in a 6-WSON with exposed pad (2x2 mm body, supplier package 6-WSON 2x2). The Enable and Power Good pins give the board designer sequenced start-up and output-status monitoring without external comparators.
Protection features reduce external BOM
Built-in over-current, over-temperature, short-circuit, and under-voltage lockout protection. No need for a separate supervisor IC or reset generator for the 5 V rail — the Power Good output flags the downstream MCU when the output is within regulation. Quiescent current is 36 µA typical, so the regulator's own draw is negligible for always-on modules like a CAN transceiver supply.
Compliance and documentation
ROHS3 compliant — no restricted-substance exemptions that expire. The standard Texas Instruments documentation package (datasheet, application notes, EVM user guide) is available for this device.