Automotive LDO for 1.2V core rails
The TLV73312PQDRVRQ1 is a fixed 1.2V output linear regulator from Texas Instruments, rated for 300 mA continuous output. The 62 µA quiescent current keeps the draw low enough for always-on modules that stay powered with ignition off — a body controller or telematics unit that sits on the battery bus.
PSRR profile and noise rejection
PSRR is 68 dB at 100 Hz, dropping to 28 dB at 100 kHz. The 40 dB roll-off means switching noise from a DC-DC converter above 100 kHz passes through with only about 28 dB of rejection — a 100 mVpp ripple on the input becomes roughly 4 mVpp on the output. If the downstream load is an analog sensor or ADC reference, an additional LC filter ahead of the LDO is worth the board area.
Package and thermal design
Surface-mount only; the exposed pad carries the ground return and the thermal path. A via array under the pad to an inner-layer ground plane drops the junction-to-board thermal resistance significantly.
Protection and control
Built-in protection includes current limit, thermal shutdown, and undervoltage lockout (UVLO). The enable pin allows the regulator to be gated by a GPIO or a power-sequence controller — the output stays off until the enable pin is pulled high. ROHS3 compliant with no exemptions — no conflict with EU or automotive substance restrictions.