Fixed 1.5V LDO in a 1.6×1.6 mm TMLF package
The MIC5308-1.5YMT-TR is a 150 mA linear regulator from Microchip Technology with a fixed 1.5 V output. It comes in the 6-TMLF® package (1.6×1.6 mm), a 6-lead UFDFN with an exposed pad for thermal management. The maximum dropout voltage is 0.15 V at the full 150 mA load, so the input rail needs only 1.65 V to maintain regulation — useful in low-headroom battery-powered designs.
PSRR and noise rejection across frequency
Power supply rejection ratio is specified at 90 dB to 70 dB at 1 kHz — the 90 dB figure is the low-frequency floor, and the 70 dB value is the worst-case across process and temperature at that frequency. For a 1 kHz ripple on the input, the output sees roughly 30 µV of ripple per 100 mV of input ripple at the 70 dB corner. This PSRR profile suits powering analog front-ends or PLL supplies where the upstream switching regulator's fundamental ripple falls in the 100 kHz to 1 MHz range — the regulator's rejection drops above 1 kHz, so a post-filter may be needed for high-frequency noise.
Temperature grade and protection for industrial use
Operating temperature covers -40°C to +125°C, which is the full industrial and automotive-grade ambient range. The junction temperature must stay within this band under load — the 150 mA output at high ambient requires the exposed pad to be soldered to a sufficient copper area on the PCB. Built-in over-current and over-temperature protection shut down the regulator if the load exceeds the safe operating area or the die temperature exceeds the thermal limit. These are non-latching protections — the output recovers when the fault clears.