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