DESCRIPTION
The CAT6218 is a 300mA CMOS low dropout regulator that provides fast response time during load current and line voltage changes.
The quick-start feature allows the use of an external
bypass capacitor to reducethe overall output noise without affecting the turn-on time of just 150μs. With zero shutdown current and low ground current of 55μA typical, the CAT6218 is ideal for battery operated devices with supply voltages from 2.3V to 5.5V. An internal under voltage lockout circuit disables the output at supply voltages under 2.1V typical.
The CAT6218 offers 1% initial accuracy and low dropout voltage, 180mV typical at 300mA. Stable operation is provided with a small value ceramic capacitor, reducing required board space and compo–nent cost.
Other features include fold-back current current limit and thermal protection.
The device is available in the low profile (1mm max height) 5-lead thin SOT23 package. 

FEATURES
Guaranteed 300mA output current
Low dropout voltage of 180mV typical at 300mA
Stable with 1μF ceramic output capacitor
External 10nF bypass capacitor for low noise
Quick-start feature
No-load ground current of 55μA typical
Full-load ground current of 80μA typical
±1.0% initial accuracy (VOUT ≥2.0V)
±2.0% accuracy over temperature (VOUT ≥2.0V)
“Zero” current shutdown mode
Fold-back current limit and under-voltage lockout
Thermal protection
Thin SOT23-5 package

APPLICATIONS
Cellular phones
Battery-powered devices
Consumer Electronics