±0.5%) CMOS upgrades for older (bipolar) low dropout
regulators. Designed specifically for battery-operated
systems, the devices’ CMOS construction eliminates
wasted ground current, significantly extending battery
life. Total supply current is typically 50 μA at full load
(20 to 60 times lower than in bipolar regulators).
The devices’ key features include ultra low noise
operation (plus optional Bypass input); very low
dropout voltage (typically 85 mV, TC1072 and 180 mV,
TC1073 at full load) and fast response to step changes
in load. An error output (ERROR) is asserted when the
devices are out-of-regulation (due to a low input
voltage or excessive output current). ERROR can be
used as a low battery warning or as a processor
RESET signal (with the addition of an external RC
network). Supply current is reduced to 0.5 μA (max)
and both VOUT and ERROR are disabled when the
shutdown input is low. The devices incorporate both
overtemperature and overcurrent protection.
The TC1072 and TC1073 are stable with an output
capacitor of only 1 μF and have a maximum output
current of 50 mA, and 100 mA, respectively. For higher
output current versions, please see the TC1185,
TC1186, TC1187 (IOUT = 150 mA) and TC1107,
TC1108 and TC1173 (IOUT = 300 mA) data sheets.