Texas Instruments’ new TPS7A30 negative-output low-dropout linear regulator is stable with any  output capacitance—ceramic or otherwise—greater than 2.2 μF. The dropout voltage is 216 mV at a 100-mA output current. The device accepts inputs of −3 to −36V. An adjustable-output version lets you set output voltages of −1.18 to −33V. Fixed versions have 1.5% nominal accuracy over load, line, and temperature. Output noise is 15.1 mV rms, and PSRR (power-supply-rejection ratio) is 72 dB at 1 kHz and 55 dB from 10 to 700 kHz. The devices have an enable pin and an NR/SS (noise-reduction/soft-start) pin, which allow you to lower noise and provide for soft start by adding a small capacitor. Maximum supply current is 3 μA in shutdown mode. Quiescent ground current ranges from 55 μA at 0A output current to 950 μA at 100-mA output.