The TPS798-Q1 is a 50mA high-voltage LDO regulator with micropower quiescent current and shutdown. The device is capable of supplying 50mA at a dropout voltage of 300mV (typical). The low operating quiescent current (40μA) drops to 1μA in shutdown. In addition to the low quiescent current, the TPS798-Q1 incorporates several protection features that make it ideal for battery-powered applications.

The device is protected against both reverse-input and reverse-output voltages. In battery-backup applications, where the output can be held up by a backup battery when the input is pulled to ground, the TPS798-Q1 acts as if a diode is in series with the device output and prevents reverse current flow. Figure 6-1 and Figure 6-2 illustrate two typical applications.

I_LED = 1.275V / R_SET –48V can vary from –4V to –50V.

Figure 6-1 Constant Brightness for Indicator LED Over Wide Input Voltage Range

Figure 6-2 Kelvin Sense Connection