CAT6219
500mA CMOS LDO Regulator
FEATURES
Guaranteed 500mA peak output current
Low dropout voltage of 300mV typical at 500mA
Stable with ceramic output capacitor
External 10nF bypass capacitor for low noise
Quick-start feature
Under voltage lockout
No-load ground current of 55μA typical
Full-load ground current of 85μA typical
±1.0% output voltage initial accuracy
±2.0% accuracy over temperature
“Zero” current shutdown mode
Current limit and thermal protection
5-lead thin SOT-23 and 6-lead TDFN packages
DESCRIPTION
The CAT6219 is a 500mA 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 CAT6219 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 2.15V typical.
The CAT6219 offers 1% initial accuracy and low
dropout voltage, 300mV typical at 500mA. Stable
operation is provided with a small value ceramic
capacitor, reducing required board space and compo-
nent cost.
Other features include current limit and thermal
protection.
The device is available in the low profile (1mm max
height) 5-lead thin SOT23 and in the 6-lead 2mm x
2mm TDFN packages.
APPLICATIONS
Cellular phones
Battery-powered devices
Consumer Electronics
PIN CONFIGURATION
5-Lead Thin SOT-23
(1mm height)
TYPICAL APPLICATION CIRCUIT
6-Lead TDFN
(2mm x 2mm)
V
IN
2.3V
to 5.5V
C
IN
1µF
VIN
VOUT
V
OUT
C
OUT
2.2µF
CAT6219
EN
GND
BYP
VIN
1
GND
2
EN
3
Top View
5
VOUT
CAT6219
4
BYP
EN
GND
VIN
1
2
3
6
5
4
BYP
NC
VOUT
OFF ON
C
BYP
(Optional)
10nF
Top View
© 2007 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. 10009 Rev. A