CAT6221
300 mA CMOS Dual LDO
Regulator
Description
The 300 mA 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 300 mA. 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 100
mA,
the dual LDO is ideal for battery−operated devices with supply voltage
from 2.3 V to 5.5 V.
The dual LDO offers 1% initial accuracy and very low dropout
voltage, typical 210 mV at 300 mA. Stable operation is provided with
small 1
mF
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 0.8 mm.
Features
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1
TSOT−23
TD SUFFIX
CASE 419AF
PIN CONNECTIONS
1
EN1
VIN
EN2
(Top View)
VOUT1
GND
VOUT2
•
•
•
•
•
•
•
•
•
•
•
•
•
Two Outputs with Guaranteed 300 mA Peak Output Current
Low Dropout Voltages of 210 mV Typical at 300 mA
Stable with Ceramic Output Capacitors
Independent Enable Pins
Under Voltage Lockout
No−load Ground Current of 100
mA
Typical
Full−load Ground Current of 160
mA
Typical
±1.0%
Output Voltage Initial Accuracy (V
OUT
≥
2.0 V)
±2.0%
Accuracy Over Temperature (V
OUT
≥
2.0 V)
“Zero” Current Shutdown Mode
Fold−back Current Limit and Thermal Protection
TSOT−23 6−lead, 0.8 mm Height Package
These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
MARKING DIAGRAM
T3YM
T3 = CAT6221 Device Code
Y = Production Year (last digit)
M = Production Month: 1
−
9, A, B, C
PIN FUNCTION
Pin #
1
2
3
4
5
6
Name
EN1
VIN
EN2
VOUT2
GND
VOUT1
Function
Enable input (active high) for
VOUT1.
Supply voltage input.
Enable input (active high) for
VOUT2.
LDO Output Voltage 2.
Ground reference.
LDO Output Voltage 1.
Applications
•
Cellular Phones
•
Battery−powered Devices
•
Consumer Electronics
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 10 of this data sheet.
©
Semiconductor Components Industries, LLC, 2011
February, 2011
−
Rev. 2
1
Publication Order Number:
CAT6221/D
CAT6221
VIN
V
IN
EN1
LDO1
EN1
Reference
VIN
2.3 V to 5.5 V
VIN
C
IN
1
mF
OFF ON
OFF ON
CAT6221
EN1
VOUT2
C
OUT2
1
mF
VOUT1
C
OUT1
1
mF
VOUT2
VOUT1
VOUT2
EN2
LDO2
EN2
Shutdown
Switch
GND
V
OUT2
Shutdown
Switch
VOUT1
V
OUT1
EN2 GND
Figure 1. Typical Application Circuit
Figure 2. CAT6221 Functional Block Diagram
Pin Function
VIN
is the supply pin for the LDO. A small 1
mF
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 2.3 V to 5.5 V.
EN1 & 2
are the enable control logic (active high) for the
regulator outputs.
VOUT1 & 2
are the LDO regulator outputs. A small 1
mF
ceramic bypass capacitor is required between the VOUT
Table 1. ABSOLUTE MAXIMUM RATINGS
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)
pins and ground. For better transient response, its value can
be increased to 4.7
mF.
The capacitor should be located near the device. For the
TSOT23 6−lead package, a continuous 300 mA output
current for both LDOs may turn−on the thermal protection.
On each output, a 250
W
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.
Rating
0 to 6.5
−0.3
to V
IN
+ 0.3
+150
Internally Limited (Note 1)
−65
to +150
260
3
Unit
V
V
_C
mW
_C
_C
kV
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
Table 2. RECOMMENDED OPERATING CONDITIONS
(Note 2)
Parameter
V
IN
V
EN
Junction Temperature Range, T
J
Package Thermal Resistance (TSOT23),
θ
JA
Range
2.3 to 5.5
0 to V
IN
−40
to +125
235
Unit
V
V
_C
_C/W
NOTE: Typical application circuit with external components is shown above.
1. The maximum allowable power dissipation at any T
A
(ambient temperature) is P
Dmax
= (T
Jmax
−
T
A
)/q
JA
. Exceeding the maximum allowable
power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown.
2. The device is not guaranteed to work outside its operating rating.
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CAT6221
Table 3. ELECTRICAL OPERATING CHARACTERISTICS
(Note 3)
(V
IN
= V
OUT
+ 1.0 V, V
EN
= High, I
OUT
= 100
mA,
C
IN
= C
OUT
= 1
mF,
ambient temperature of 25°C (over recommended operating
conditions unless specified otherwise).
Bold numbers
apply for the entire junction temperature range.)
Symbol
V
OUT−ACC
TC
OUT
V
R−LINE
V
R−LOAD
V
DROP
I
GND
Parameter
Output Voltage Accuracy
Conditions
Initial accuracy (Note 4)
Min
−1.0
−2.0
Output Voltage Temp. Coefficient
Line Regulation
V
IN
= V
OUT
+ 1.0 V to 5.5 V
I
OUT
= 100
mA
to 300 mA
I
OUT
= 300 mA
Both LDOs Enabled
I
OUT
= 0
mA
Both LDOs Enabled
I
OUT
= 300 mA
One LDO Enabled
I
OUT
= 0
mA
One LDO Enabled
I
OUT
= 300 mA
I
GND−SD
PSRR
Shutdown Ground Current
V
EN
< 0.4 V
f = 1 kHz
f = 20 kHz
I
SC
T
ON
e
N
R
OUT−SH
V
IN−UVLO
ESR
Output short circuit current limit
Turn−On Time
Output Noise Voltage (Note 6)
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 5.5 V
V
IN
= 2.3 to 5.5 V
V
EN
= 0.4 V
V
EN
= V
IN
THERMAL PROTECTION
T
SD
T
HYS
Thermal Shutdown
Thermal Hysteresis
160
10
°C
°C
0.05
0.1
5
BW = 10 Hz to 100 kHz
V
OUT
= 0 V
60
45
130
150
95
250
2.15
500
mA
ms
mVrms
W
V
mW
−0.2
−0.4
Load Regulation
0.9
40
±0.1
+0.2
+0.4
1.5
2
Dropout Voltage (Note 5)
210
280
350
Ground Current
100
140
170
160
55
75
90
85
2
4
Power Supply Rejection Ratio
dB
mA
mA
mV
%
Typ
Max
+1.0
+2.0
ppm/°C
%/V
Unit
%
ENABLE INPUT (EN1, EN2)
V
HI
V
LO
I
EN
1.8
0.4
1
1
V
V
mA
3. Specification for 2.8 V output version unless specified otherwise.
4. For V
OUT
< 2.0 V, the initial accuracy is
±2%
and across temp is
±3%.
5. Dropout voltage is defined as the input−to−output differential at which the output voltage drops 2% below its nominal value measured at 1 V
differential. During test, the input voltage stays always above the minimum 2.3 V.
6. Specification for 1.8 V output version.
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CAT6221
TYPICAL CHARACTERISTICS
(shown for 2.8 V/1.8 V outputs option)
(V
IN
= 3.8 V, I
OUT
= 100
mA,
EN1 = EN2 = V
IN
, C
IN
= C
OUT
= 1
mF,
T
A
= 25°C unless otherwise specified.)
Figure 3. Output Voltage 1 vs. Temperature
Figure 4. Output Voltage 2 vs. Temperature
Figure 5. Load Regulation VOUT1
Figure 6. Load Regulation VOUT2
Figure 7. Ground Current (EN2 = GND)
Figure 8. Ground Current (EN1 = GND)
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CAT6221
TYPICAL CHARACTERISTICS
(shown for 2.8 V/1.8 V outputs option)
(V
IN
= 3.8 V, I
OUT
= 100
mA,
EN1 = EN2 = V
IN
, C
IN
= C
OUT
= 1
mF,
T
A
= 25°C unless otherwise specified.)
Figure 9. Ground Current (EN2 = GND)
Figure 10. Ground Current (EN1 = GND)
Figure 11. Output 1 Dropout Characteristics
Figure 12. Ground Current vs. Input Voltage
Figure 13. Output Voltage 1 vs. Load Current 1
Figure 14. Output Voltage 2 vs. Load Current 2
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Microchip MCU
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