CAT6218
300mA CMOS LDO Regulator
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 (V
OUT
≥
2.0V)
±2.0% accuracy over temperature (V
OUT
≥
2.0V)
“Zero” current shutdown mode
Fold-back current limit and under-voltage
lockout
Thermal protection
Thin SOT23-5 package
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 reduce the 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.
APPLICATIONS
Cellular phones
Battery-powered devices
Consumer Electronics
PIN CONFIGURATION
TSOT-23 5-Lead
(1mm height)
VIN
1
GND
2
EN
3
Top View
TYPICAL APPLICATION CIRCUIT
5
VOUT
V
IN
2.3V
to 5.5V
OFF ON
C
IN
1µF
VIN
VOUT
1µF
C
OUT
CAT6218
EN
GND
BYP
V
OUT
4
BYP
C
BYP
(Optional)
10nF
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. MD-10010 Rev. C
CATALYST [ CATALYST SEMICONDUCTOR ]
