TC1224-3.3VCTTR

The TC1223 and TC1224 are high accuracy (typically ±0.5%) CMOS upgrades for older (bipolar) low dropout regulators such as the LP2980. Designed specifically for battery-operated systems, the devices’ CMOS construction eliminates wasted ground current, significantly extending battery life. Total supply current is typically 50μA at full load (20 to 60 times lower than in bipolar regulators).

The devices’ key features include ultra low noise operation; very low dropout voltage (typically 85mV, TC1223 and 180mV, TC1224 at full load) and fast response to step changes in load. Supply current is reduced to 0.5μA (max) and VOUT falls to zero when the shutdown input is low. The devices incorporate both over temperature and over current protection.

The TC1223 and TC1224 are stable with an output capacitor of only 1μF and have a maximum output current of 50mA and 100mA respectively.

The TC1223 and TC1224 are precision fixed output voltage regulators. Unlike bipolar regulators, the TC1223 and TC1224’s supply current does not increase with load current. In addition, VOUT remains stable and within regulation over the entire 0mA to IOUTMAX operating load current range, (an important consideration in RTC and CMOS RAM battery back-up applications).