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 TSOT-23 and 6-pad 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 TSOT23 and in the 6-pad 2mm x 2mm
TDFN packages.
APPLICATIONS
Cellular phones
Battery-powered devices
Consumer Electronics
For Ordering Information details, see page 9.
PIN CONFIGURATION
5-Lead TSOT-23
(1mm height)
TYPICAL APPLICATION CIRCUIT
6-Pad 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
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. MD-10009 Rev. B
CAT6219
PIN DESCRIPTIONS
Pin # Name Function
1
VIN Supply voltage input.
2
GND Ground reference.
Enable input (active high); a 2.5MΩ
3
EN
pull-down resistor is provided.
Optional bypass capacitor connection
4
BYP for noise reduction and PSRR
enhancing.
5 VOUT LDO Output Voltage.
BLOCK DIAGRAM
VIN
V
IN
EN
LDO
EN
BYP
Reference
Shutdown
Switch
VOUT
V
OUT
GND
Figure 2. CAT6219 Functional Block Diagram
PIN FUNCTION
VIN
is the supply pin for the LDO. A small 1μF
ceramic bypass capacitor is required between the V
IN
pin and ground near the device. When using longer
connections to the power supply, C
IN
value can be
increased without limit. The operating input voltage
range is from 2.3V to 5.5V.
EN
is the enable control logic (active high) for the regulator
output. It has a 2.5MΩ pull-down resistor, which
assures that if EN pin is left open, the circuit is disabled.
VOUT
is the LDO regulator output. A small 2.2μF
ceramic bypass capacitor is required between the
VOUT pin and ground. For better transient response,
its value can be increased to 4.7μF.
The capacitor should be located near the device. For
the SOT23-5 package, a continuous 500mA output
current may turn-on the thermal protection. A 250Ω
internal shutdown switch discharges the output
capacitor in the no-load condition.
GND
is the ground reference for the LDO. The pin
must be connected to the ground plane on the PCB.
BYP
is the reference bypass pin. An optional 0.01μF
capacitor can be connected between BYP pin and
GND to reduce the output noise and enhance the
PSRR at high frequency.
ABSOLUTE MAXIMUM RATINGS
(1)
Parameter
V
IN
V
EN
, V
OUT
Junction Temperature, T
J
Power Dissipation, P
D
Storage Temperature Range, T
S
Lead Temperature (soldering, 5 sec.)
ESD Rating (Human Body Model)
Rating
0 to 6.5
-0.3 to V
IN
+0.3
+150
Internally Limited
(2)
-65 to +150
260
3
Unit
V
V
°C
mW
°C
°C
kV
RECOMMENDED OPERATING CONDITIONS
(3)
Parameter
V
IN
V
EN
Junction Temperature Range, T
J
Package Thermal Resistance (SOT23-5),
θ
JA
Range
2.3 to 5.5
0 to V
IN
-40 to +125
235
Unit
V
V
°C
°C/W
Typical application circuit with external components is shown on page 1.
Notes:
(1) Exceeding maximum rating may damage the device.
(2) The maximum allowable power dissipation at any T
A
(ambient temperature) is P
Dmax
= (T
Jmax
– T
A
) /
θ
JA
. Exceeding the maximum
allowable power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown.
(3) The device is not guaranteed to work outside its operating rating.
Doc. No. MD-10009 Rev. B
2
©
Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT6219
ELECTRICAL OPERATING CHARACTERISTICS
(1)
V
IN
= V
OUT
+ 1.0V, V
EN
= High, I
OUT
= 100μA, C
IN
= 1µF, C
OUT
= 2.2µF, ambient temperature of 25ºC (over
recommended operating conditions unless specified otherwise).
Bold numbers
apply for the entire junction
temperature range.
Symbol Parameter
V
OUT-ACC
TC
OUT
V
R-LINE
V
R-LOAD
V
DROP
Output Voltage Accuracy
Output Voltage Temp. Coefficient
Line Regulation
Load Regulation
Dropout Voltage
(2)
V
IN
= V
OUT
+ 1.0V to 5.5V
I
OUT
= 100μA to 500 mA
I
OUT
= 500mA
I
OUT
= 0μA
I
OUT
= 500mA
I
GND-SD
PSRR
I
SC
T
ON
e
N
R
OUT-SH
R
EN
V
IN-UVLO
ESR
V
HI
V
LO
I
EN
Shutdown Ground Current
Power Supply Rejection Ratio
Output short circuit current limit
Turn-On Time
Output Noise Voltage
(3)
Shutdown Switch Resistance
Enable pull-down resistor
Under voltage lockout threshold
C
OUT
equivalent series resistance
Logic High Level
Logic Low Level
Enable Input Current
V
IN
= 2.3 to 5.5V
V
IN
= 2.3 to 5.5V
V
EN
= 0.4V
V
EN
= V
IN
0.15
1.5
160
10
5
1.8
0.4
1
4
V
EN
< 0.4V
f = 1kHz, C
BYP
= 10nF
f = 20kHz, C
BYP
= 10nF
V
OUT
= 0V
C
BYP
= 10nF
BW = 10Hz to 100kHz
600
64
54
800
150
45
250
2.5
2.15
500
-0.2
-0.4
1
300
55
85
1
2
μA
dB
mA
μs
μVrms
Ω
MΩ
V
mΩ
V
V
μA
Conditions
Initial accuracy
Min
-1.0
-2.0
40
±0.1
+0.2
+0.4
1.5
2
400
500
75
90
μA
Typ
Max
+1.0
+2.0
Unit
%
ppm/ºC
%/V
%
mV
I
GND
Ground Current
Enable Input
Thermal Protection
T
SD
T
HYS
Notes:
(1)
(2)
(3)
Specification for 2.85V output version unless specified otherwise.
Dropout voltage is defined as the input-to-output differential at which the output voltage drops 2% below its nominal value measured at
1V differential. During test, the input voltage stays always above the minimum 2.3V.
Specification for 1.8V output version.
Thermal Shutdown
Thermal Hysteresis
ºC
ºC
©
Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
3
Doc. No. MD-10009 Rev. B
CAT6219
TYPICAL CHARACTERISTICS
(shown for 2.85V output version)
V
IN
= 3.85V, I
OUT
= 100μA, C
IN
= 1µF, C
OUT
= 2.2μF, C
BYP
= 10nF, T
A
= 25°C unless otherwise specified.
Dropout Characteristics
3.0
Line Regulation
2.87
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
2.5
2.0
1.5
1.0
0.5
0.0
0.1mA
500mA
2.86
2.85
2.84
2.83
2.82
2.5
3
3.5
4
4.5
5
5.5
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Load Regulation
2.95
2.87
Output Voltage vs. Temperature
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
0
50 100 150 200 250 300 350 400 450 500
2.90
2.86
2.85
2.84
2.83
2.82
-40 -20
0
20
40
60
80 100 120 140
2.85
2.80
2.75
OUTPUT LOAD CURRENT (mA)
TEMPERATURE (ºC)
Ground Current vs. Load Current
100
65
Ground Current vs. Temperature
GROUND CURRENT (µA)
GROUND CURRENT (µA)
90
80
70
60
50
0
50 100 150 200 250 300 350 400 450 500
61
57
53
49
45
-40
-20
0
20
40
60
80
100 120 140
OUTPUT LOAD CURRENT (mA)
TEMPERATURE (ºC)
Doc. No. MD-10009 Rev. B
4
©
Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT6219
TYPICAL CHARACTERISTICS
(shown for 2.85V output option)
V
IN
= 3.85V, I
OUT
= 100μA, C
IN
= 1µF, C
OUT
= 2.2μF, C
BYP
= 10nF, T
A
= 25°C unless otherwise specified.
Output Short-circuit Current vs. Input Voltage
1000
Ground Current vs. Input Voltage
70
GROUND CURRENT (µA)
V
OUT
= 0
0
1
2
3
4
5
900
60
50
40
30
20
10
0
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
5.5
CURRENT LIMIT (mA)
800
700
600
500
400
300
200
100
0
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Dropout vs. Temperature (500mA Load)
500mA DROPOUT VOLTAGE (mV)
500
400
Dropout vs. Load Current
DROPOUT VOLTAGE (mV)
-40 -20
0
20
40
60
80 100 120 140
450
400
350
300
250
200
350
300
250
200
150
100
50
0
0
50 100 150 200 250 300 350 400 450 500
TEMPERATURE (°C)
OUTPUT LOAD CURRENT (mA)
Enable Threshold vs. Input Voltage
1.6
PSRR vs. Frequency (10mA Load)
80
70
ENABLE THRESHOLD (V)
C
BYP
= 10nF
C
BYP
= 0
1.2
60
PSRR [dB]
50
40
30
20
10
0.8
0.4
0
2
2.5
3
3.5
4
4.5
5
5.5
0
1.0E+01
1.0E+02
1.0E+03
1.0E+04
1.0E+05
INPUT VOLTAGE (V)
FREQUENCY [Hz]
©
Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
5
Doc. No. MD-10009 Rev. B
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