© Semiconductor Components Industries, LLC, 2011
January, 2011 − Rev. 5
1Publication Order Number:
CAT6218/D
CAT6218
300 mA CMOS LDO
Regulator
Description
The CAT6218 is a 300 mA 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 150 ms.
With zero shutdown current and low ground current of 55 mA
typical, the CAT6218 is ideal for battery−operated devices with supply
voltages from 2.3 V to 5.5 V. An internal under voltage lockout circuit
disables the output at supply voltages under 2.1 V typical.
The CAT6218 offers 1% initial accuracy and low dropout voltage,
180 mV typical at 300 mA. Stable operation is provided with a small
value ceramic capacitor, reducing required board space and
component cost.
Other features include fold−back current limit and thermal
protection.
The device is available in the low profile (1 mm max height) 5−lead
thin SOT23 package.
Features
•Guaranteed 300 mA Output Current
•Low Dropout Voltage of 180 mV Typical at 300 mA
•Stable with 1 mF Ceramic Output Capacitor
•External 10 nF Bypass Capacitor for Low Noise
•Quick−start Feature
•No−load Ground Current of 55 mA Typical
•Full−load Ground Current of 80 mA Typical
•±1.0% Initial Accuracy (VOUT ≥ 2.0 V)
•±2.0% Accuracy Over Temperature (VOUT ≥ 2.0 V)
•“Zero” Current Shutdown Mode
•Fold−back Current Limit and Under−voltage Lockout
•Thermal Protection
•Thin SOT23−5 Package
•These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Applications
•Cellular Phones
•Battery−powered Devices
•Consumer Electronics
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TSOT−23
TD SUFFIX
CASE 419AE
PIN CONNECTIONS
RUYM
MARKING DIAGRAM
1
5
(Top View)
VOUT
BYP
VIN
GND
EN
1
See detailed ordering and shipping information in the package
dimensions section on page 9 of this data sheet.
ORDERING INFORMATION
Supply voltage input.1
Ground reference.2
Enable input (active high); a 2.5 MW
pull−down resistor is provided.
3
Optional bypass capacitor connec-
tion for noise reduction and PSRR
enhancing.
4
LDO Output Voltage.5
FunctionPin #
PIN FUNCTION
Name
VIN
GND
EN
BYP
VOUT
RU= CAT6218 Device Code
Y = Production Year (last digit)
M = Production Month: 1 − 9, A, B, C
CAT6218
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Figure 1. Typical Application Circuit
VIN
BYPEN
VOUT
GND
OFF ON
1 μF
2.3 V
to 5.5 V 1 μF
10 nF
CAT6218
Figure 2. CAT6218 Functional Block Diagram
BYP
EN
GND
VIN VOUT
Shutdown
Switch
LDO
Reference
CIN
VIN VOUT
COUT
CBYP (Optional)
VIN
VOUT
Pin Function
VIN is the supply pin for the LDO. A small 1 mF ceramic
bypass capacitor is required between the VIN pin and ground
near the device. When using longer connections to the power
supply, CIN value can be increased without limit. The
operating input voltage range is from 2.3 V to 5.5 V.
EN is the enable control logic (active high) for the regulator
output. It has a 2.5 MW pull−down resistor, which assures
that if EN pin is left open, the circuit is disabled.
VOUT is the LDO regulator output. A small 1 mF ceramic
bypass capacitor is required between the VOUT pin and
ground for stability. For better transient response, its value
can be increased to 4.7 mF.
The capacitor should be located near the device. ESR
domain is 5 mW to 500 mW. VOUT can deliver a maximum
guaranteed current of 300 mA. For input−to−output voltages
higher than 1 V, a continuous 300 mA output current might
turn−on the thermal protection. 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.
BYP is the reference bypass pin. An optional 0.01 mF
capacitor can be connected between BYP pin and GND to
reduce the output noise and enhance the PSRR at high
frequency.
Table 1. ABSOLUTE MAXIMUM RATINGS
Parameter Rating Unit
VIN 0 to 6.5 V
VEN, VOUT −0.3 to VIN + 0.3 V
Junction Temperature, TJ+150 _C
Power Dissipation, PDInternally Limited (Note 1) mW
Storage Temperature Range, TS−65 to +150 _C
Lead Temperature (soldering, 5 sec.) 260 _C
ESD Rating (Human Body Model) 3 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 Range Unit
VIN 2.3 to 5.5 V
VEN 0 to VIN V
Junction Temperature Range, TJ−40 to +125 _C
Package Thermal Resistance (SOT23−5), θJA 235 _C/W
NOTE: Typical application circuit with external components is shown above.
1. The maximum allowable power dissipation at any TA (ambient temperature) is PDmax = (TJmax − TA)/qJA. 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.
CAT6218
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Table 3. ELECTRICAL OPERATING CHARACTERISTICS (Note 3)
(VIN = VOUT + 1.0 V, VEN = High, IOUT = 100 mA, CIN = COUT = 1 mF, ambient temperature of 25°C (over recommended operating
conditions unless specified otherwise). Bold numbers apply for the entire junction temperature range.)
Symbol Parameter Conditions Min Typ Max Unit
VOUT−ACC Output Voltage Accuracy Initial accuracy for VOUT ≥ 2.0 V
(Note 6)
−1.0 +1.0 %
−2.0 +2.0
TCOUT Output Voltage Temp. Coefficient 40 ppm/°C
VR−LINE Line Regulation VIN = VOUT + 1.0 V to 5.5 V −0.2 ±0.1 +0.2 %/V
−0.4 +0.4
VR−LOAD Load Regulation IOUT = 100 mA to 300 mA 0.7 1.2 %
1.5
VDROP Dropout Voltage (Note 4) IOUT = 300 mA 180 250 mV
300
IGND Ground Current IOUT = 0 mA 55 75 mA
90
IOUT = 300 mA 80
IGND−SD Shutdown Ground Current VEN < 0.4 V 1mA
2
PSRR Power Supply Rejection Ratio f = 1 kHz, CBYP = 10 nF 64 dB
f = 20 kHz, CBYP = 10 nF 54
ISC Output short circuit current limit VOUT = 0 V 180 mA
TON Turn−On Time CBYP = 10 nF 150 ms
eNOutput Noise Voltage (Note 5) BW = 10 Hz to 100 kHz 45 mVrms
ROUT−SH Shutdown Switch Resistance 250 W
REN Enable pull−down resistor 2.5 MW
VUVLO Under−voltage lock out (UVLO)
threshold
2.1 V
ESR COUT equivalent series resistance 5 500 mW
ENABLE INPUT
VHI Logic High Level VIN = 2.3 to 5.5 V 1.8 V
VIN = 2.3 to 5.5 V, 0°C to +125°C
junction temperature
1.6
VLO Logic Low Level VIN = 2.3 to 5.5 V 0.4 V
IEN Enable Input Current VEN = 0.4 V 0.15 1mA
VEN = VIN 1.5 4
THERMAL PROTECTION
TSD Thermal Shutdown 160 °C
THYS Thermal Hysteresis 10 °C
3. Specification for 2.80 V output version unless specified otherwise.
4. Dropout voltage is defined as the input−to−output differential at which the output voltage drops 2% below its nominal value. During test, the
input voltage stays always above the minimum 2.3 V.
5. Specification for 1.8 V output version.
6. For VOUT < 2.0 V, the initial accuracy is ±2% and across temperature ±3%.
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TYPICAL CHARACTERISTICS (shown for 2.80 V output option)
(VIN = 3.85 V, IOUT = 100 mA, CIN = COUT = 1 mF, CBYP = 10 nF, TA = 25°C unless otherwise specified.)
Figure 3. Dropout Characteristics Figure 4. Line Regulation
Figure 5. Load Regulation Figure 6. Output Voltage vs. Temperature
Figure 7. Ground Current vs. Load Current Figure 8. Ground Current vs. Temperature
0.0
0.5
1.0
1.5
2.0
2.5
3.0
0.0 1.0 2.0 3.0 4.0 5.0 6.0
INPUT VOLTAGE [V]
OUTPUT VOLTAGE [V]
100mA
300mA
2.82
2.83
2.84
2.85
2.86
2.87
2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE [V]
OUTPUT VOLTAGE [V]
2.75
2.80
2.85
2.90
2.95
0 50 100 150 200 250 300
OUTPUT LOAD CURRENT [mA]
OUTPUT VOLTAGE [V]
2.82
2.83
2.84
2.85
2.86
2.87
−40 −10 20 50 80 110 140
TEMPERATURE [°C]
OUTPUT VOLTAGE [V]
50
60
70
80
90
100
0 25 50 75 100 125 150
OUTPUT LOAD CURRENT [mA]
GROUND CURRENT [mA]
45
50
55
60
65
−40 −10 20 50 80 110 140
TEMPERATURE [°C]
GROUND CURRENT [mA]
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TYPICAL CHARACTERISTICS (shown for 2.80 V output option)
(VIN = 3.85 V, IOUT = 100 mA, CIN = COUT = 1 mF, CBYP = 10 nF, TA = 25°C unless otherwise specified.)
Figure 9. Output Voltage vs. Load Current Figure 10. Ground Current vs. Input Voltage
Figure 11. Dropout vs. Temperature
(300 mA Load)
Figure 12. Dropout vs. Load Current
Figure 13. Enable Threshold vs. Input Voltage Figure 14. PSRR vs. Frequency (10 mA Load)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
0 100 200 300 400 500 600 700
OUTPUT LOAD CURRENT [mA]
OUTPUT VOLTAGE [V]
0
10
20
30
40
50
60
70
0.0 1.0 2.0 3.0 4.0 5.0 6.0
INPUT VOLTAGE [V]
GROUND CURRENT [mA]
100
150
200
250
300
350
−40 −10 20 50 80 110 140
TEMPERATURE [°C]
DROPOUT VOLTAGE [mV]
0
50
100
150
200
250
300
0 50 100 150 200 250 300
OUTPUT LOAD CURRENT [mA]
DROPOUT VOLTAGE [mV]
0.0
0.4
0.8
1.2
1.6
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE [V]
ENABLE THRESHOLD [V]
0
10
20
30
40
50
60
70
80
0.01 0.1 1 10 100
FREQUENCY [kHz]
PSRR [dB]
CBYP = 10 nF
CBYP = 0
CAT6218
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TYPICAL CHARACTERISTICS (shown for 2.80 V output option)
(VIN = 3.85 V, IOUT = 100 mA, CIN = COUT = 1 mF, CBYP = 10 nF, TA = 25°C unless otherwise specified.)
Figure 15. PSRR (30 mA Load) Figure 16. PSRR (200 mA Load)
0
10
20
30
40
50
60
70
0 100 200 300 400 500
VIN − VOUT [mV]
PSRR [dB]
100kHz
10kHz
1kHz
0
10
20
30
40
50
60
70
0 100 200 300 400 500
VIN − VOUT [mV]
PSRR [dB]
100kHz
10kHz
1kHz
CAT6218
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TRANSIENT CHARACTERISTICS (shown for 2.80 V output option)
(VIN = 3.85 V, IOUT = 100 mA, CIN = COUT = 1 mF, CBYP = 10 nF, TA = 25°C unless otherwise specified.)
Figure 17. Enable Turn−on (100 mA Load) Figure 18. Enable Turn−off (100 mA Load)
Figure 19. Enable Turn−on (300 mA Load) Figure 20. Enable Turn−off (300 mA Load)
Figure 21. Line Transient Response
(3.85 V to 4.85 V)
Figure 22. Load Transient Response
(0.1 mA to 300 mA)
Note: All transient characteristics are generated using the evaluation board CAT621XEVAL1.
CAT6218
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PACKAGE DIMENSIONS
TSOT−23, 5 LEAD
CASE 419AE−01
ISSUE O
E1 E
A2
A1
e
b
D
c
A
TOP VIEW
SIDE VIEW END VIEW
L1
LL2
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC MO-193.
SYMBOL
θ
MIN NOM MAX
q
A
A1
A2
b
c
D
E
E1
e
L
0º 8º
L1
L2
0.01
0.80
0.30
0.12
0.30
0.05
0.87
0.15
2.90 BSC
2.80 BSC
1.60 BSC
0.95 TYP
0.40
0.60 REF
0.25 BSC
1.00
0.10
0.90
0.45
0.20
0.50
CAT6218
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Example of Ordering Information (Note 9)
Prefix Device # Suffix
Company ID
CAT 6218
Product Number
6218
T3
T: Tape & Reel
3: 3,000 / Reel
Tape & Reel (Note 11)
(Optional)
TD
Package
TD: TSOT−23
G
G: NiPdAu
Lead Finish
−180
150: 1.50 V
180: 1.80 V
240: 2.40 V
250: 2.50 V
270: 2.70 V
280: 2.80 V
285: 2.85 V
300: 3.00 V
320: 3.20 V
330: 3.30 V
VOUT Voltage (Note 10)
ORDERING INFORMATION
Orderable Part Number VOUT Voltage Package Shipping
CAT6218−150TDGT3 1.50 V TSOT−23 3,000 / Tape & Reel
CAT6218−180TDGT3 1.80 V TSOT−23 3,000 / Tape & Reel
CAT6218−240TDGT3 2.40 V TSOT−23 3,000 / Tape & Reel
CAT6218−250TDGT3 2.50 V TSOT−23 3,000 / Tape & Reel
CAT6218−270TDGT3 2.70 V TSOT−23 3,000 / Tape & Reel
CAT6218−280TDGT3 2.80 V TSOT−23 3,000 / Tape & Reel
CAT6218−285TDGT3 (Note 10) 2.85 V TSOT−23 3,000 / Tape & Reel
CAT6218−300TDGT3 3.00 V TSOT−23 3,000 / Tape & Reel
CAT6218−320TDGT3 (Note 10) 3.20 V TSOT−23 3,000 / Tape & Reel
CAT6218−330TDGT3 3.30 V TSOT−23 3,000 / Tape & Reel
7. All packages are RoHS−compliant (Lead−free, Halogen−free).
8. The standard finish is NiPdAu.
9. The device used in the above example is a CAT6218−180TDGT3 (VOUT = 1.8 V, in a TSOT−23 package, NiPdAu, Tape & Reel, 3,000/Reel).
10.For other voltage options, please contact your nearest ON Semiconductor Sales office.
11. For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice
to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All
operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights
nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications
intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should
Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates,
and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death
associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal
Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
CAT6218/D
PUBLICATION ORDERING INFORMATION
N. American Technical Support: 800−282−9855 Toll Free
USA/Canada
Europe, Middle East and Africa Technical Support:
Phone: 421 33 790 2910
Japan Customer Focus Center
Phone: 81−3−5773−3850
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Phone: 303−675−2175 or 800−344−3860 Toll Free USA/Canada
Fax: 303−675−2176 or 800−344−3867 Toll Free USA/Canada
Email: orderlit@onsemi.com
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For additional information, please contact your local
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