4V to 40V Input, 50mA LDO regulators consume only 10 microamps of quiescent current

MAX15006/MAX15007 ultra-low quiescent current, high-voltage, low-dropout (LDO) linear regulators are designed for harsh automotive environments. They can operate from a cold-crank voltage as low as 4 V and withstand load-dump transients as high as 45 V.