CAT6221
300mA CMOS Dual LDO Regulator
FEATURES
Two outputs with guaranteed 300mA peak
output current
Low dropout voltages of 210mV typical at
300mA
Stable with ceramic output capacitors
Independent enable pins
Under voltage lockout
No-load ground current of 100μA typical
Full-load ground current of 160μA typical
±1.0% output voltage initial accuracy
±2.0% accuracy over temperature
“Zero” current shutdown mode
Fold-back current limit and thermal protection
TSOT-23 6-lead, 0.8mm height package
DESCRIPTION
The 300mA CMOS Dual LDO CAT6221 combines in a
single TSOT-23 6-lead package two low dropout
regulators (LDO), each with its own enable pin.
The regulator outputs drive loads up to 300mA. By
design, the dual LDO provides fast response time
during load current and line voltage changes.
Each LDO is optimized for low noise and high
crosstalk isolation. With zero shut down current and a
low quiescent current of 100μA, the dual LDO is ideal
for battery-operated devices with supply voltage from
2.3V to 5.5V.
The dual LDO offers 1% initial accuracy and very low
dropout voltage, typical 210mV at 300mA. Stable
operation is provided with small 1μF ceramic output
capacitors, reducing required board space and
component cost.
Other features include fold-back current limit and
thermal protection.
The dual LDO is available in the tiny 6-lead TSOT-23
package with a maximum height of 0.8mm.
APPLICATIONS
Cellular phones
Battery-powered devices
Consumer Electronics
For Ordering Information details, see page 10.
PIN CONFIGURATION
6-Lead TSOT-23
(0.8mm height)
TYPICAL APPLICATION CIRCUIT
VIN
EN1
VIN
EN2
1
2
3
CAT4201
6
5
4
VOUT1
GND
VIN
C
IN
1µF
VOUT1
C
OUT1
1µF
VOUT1
2.3V to 5.5V
CAT6221
EN1
VOUT2
OFF ON
VOUT2
VOUT2
C
OUT2
1µF
OFF ON
EN2 GND
Top View
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
1
Doc. No. MD-10001 Rev. B
CAT6221
PIN DESCRIPTIONS
Pin # Name Function
1
EN1 Enable input (active high) for VOUT1.
2
VIN
Supply voltage input.
3
EN2 Enable input (active high) for VOUT2.
4 VOUT2 LDO Output Voltage 2.
5
GND Ground reference.
6 VOUT1 LDO Output Voltage 1.
BLOCK DIAGRAM
VIN
V
IN
VOUT1
EN1
LDO1
V
OUT1
EN1
Reference
Shutdown
Switch
VOUT2
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.
EN1 & 2
are the enable control logic (active high) for the
regulator outputs.
VOUT1 & 2
are the LDO regulator outputs. A small 1μF
ceramic bypass capacitor is required between the
VOUT pins and ground. For better transient response,
its value can be increased to 4.7μF.
The capacitor should be located near the device. For
the TSOT23 6-lead package, a continuous 300mA
output current for both LDOs may turn-on the thermal
protection.
EN2
LDO2
V
OUT2
EN2
Shutdown
Switch
GND
Figure 2. CAT6221 Functional Block Diagram
On each output, 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.
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
Range
V
IN
2.3 to 5.5
V
EN
0 to V
IN
Junction Temperature Range, T
J
-40 to +125
235
Package Thermal Resistance (TSOT23),
θ
JA
Typical application circuit with external components are shown on page 1.
Unit
V
V
°C
°C/W
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-10001 Rev. B
2
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT6221
ELECTRICAL OPERATING CHARACTERISTICS
(1)
V
IN
= V
OUT
+ 1.0V, V
EN
= High, I
OUT
= 100µA, C
IN
= C
OUT
= 1µF, 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 300 mA
I
OUT
= 300mA
Both LDOs Enabled
I
OUT
= 0μA
Both LDOs Enabled
I
OUT
= 300mA
One LDO Enabled
I
OUT
= 0μA
One LDO Enabled
I
OUT
= 300mA
I
GND-SD
PSRR
I
SC
T
ON
e
N
R
OUT-SH
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
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
5
1.8
0.4
0.05
0.1
160
10
1
1
BW = 10Hz to 100kHz
V
EN
< 0.4V
f = 1kHz
f = 20kHz
V
OUT
= 0V
60
45
130
150
95
250
2.15
500
-0.2
-0.4
Conditions
Initial accuracy
Min
-1.0
-2.0
40
±0.1
0.9
210
100
Typ
Max
+1.0
+2.0
+0.2
+0.4
1.5
2
280
350
140
170
160
55
75
90
85
2
4
µA
dB
mA
µs
µVrms
Ω
V
mΩ
V
V
µA
µA
Unit
%
ppm/ºC
%/V
%
mV
I
GND
Ground Current
Enable Input (EN1, EN2)
Thermal Protection
T
SD
T
HYS
.
Thermal Shutdown
Thermal Hysteresis
ºC
ºC
Notes:
(1) Specification for 2.8V output version unless specified otherwise.
(2) 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.
(3) Specification for 1.8V output version.
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
3
Doc. No. MD-10001 Rev. B
CAT6221
TYPICAL CHARACTERISTICS
(shown for 2.8V/1.8V outputs version)
V
IN
= 3.8V, I
OUT
= 100µA, EN1 = EN2 = V
IN
, C
IN
= C
OUT
= 1µF, T
A
= 25°C unless otherwise specified.
Output Voltage 1 vs. Temperature
Output Voltage 2 vs. Temperature
Load Regulation VOUT1
Load Regulation VOUT2
Ground Current (EN2 = GND)
Ground Current (EN1 = GND)
Doc. No. MD-10001 Rev. B
4
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT6221
TYPICAL CHARACTERISTICS
(shown for 2.8V/1.8V outputs option)
V
IN
= 3.8V, I
OUT
= 100µA, EN1 = EN2 = V
IN
, C
IN
= C
OUT
= 1µF, T
A
= 25°C unless otherwise specified.
Ground Current (EN2 = GND)
Ground Current (EN1 = GND)
Output 1 Dropout Characteristics
Ground Current vs. Input Voltage
Output Voltage 1 vs. Load Current 1
Output Voltage 2 vs. Load Current 2
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
5
Doc. No. MD-10001 Rev. B
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