TI TL5209

TL5209
500-mA LOW-NOISE LOW-DROPOUT VOLTAGE REGULATOR
WITH SHUTDOWN
www.ti.com
SLVS581A – SEPTEMBER 2006 – REVISED MAY 2007
FEATURES
•
•
•
•
•
•
•
•
•
•
•
Adjustable Output Voltage
1%/2% Accuracy (25°C/Full Range)
500-mV (Max) Dropout at Full Load of 500 mA
Extremely Tight Regulation Over Temperature
Range
– 0.1%/V (Max) Line Regulation
– 0.7% (Max) Load Regulation
Ultra-Low Noise Capability (300 nV/√Hz Typ)
Shutdown Current of 3 µA (Max)
Low Temperature Coefficient
Current Limiting and Thermal Protection
Stable With Minimum Load of 1 mA
Reverse-Battery Protection
Applications
– Portable Applications (PDAs, Laptops,
Cell Phones)
– Consumer Electronics
– Post-Regulation for SMPS
Available in Convenient SOIC-8
Surface-Mount Package
•
D PACKAGE
(TOP VIEW)
EN
IN
OUT
ADJ/BYP
1
8
2
7
3
6
4
5
GND
GND
GND
GND
DESCRIPTION/ORDERING INFORMATION
The TL5209 is an efficient PNP low-dropout (LDO) regulator that is well suited for portable applications. It has
significantly lower quiescent current than previously was available from traditional PNP regulators and allows for
a shutdown current of only 0.05 µA (typical). The TL5209 also has very good dropout voltage characteristics,
requiring a maximum dropout of 60 mV at light loads and 500 mV at full load. In addition, the LDO also has 1%
output voltage accuracy and extremely tight line and load regulation that is hard to match by its CMOS
counterparts.
For noise-sensitive applications, the TL5209 allows for low-noise capability via an external bypass capacitor
connected to the BYP pin, which reduces the output noise of the regulator. Other features include current
limiting, thermal shutdown, reverse-battery protection, and low temperature coefficient.
The TL5209 is available with adjustable output. Offered in an SOIC-8 surface-mount package, the TL5209 is
characterized for operation over the virtual junction temperature ranges of –40°C to 125°C.
ORDERING INFORMATION (1)
PACKAGE (2)
TJ
–40°C to 125°C
(1)
(2)
SOIC – D
Reel of 2000
ORDERABLE PART NUMBER
TL5209DR
TOP-SIDE MARKING
TL5209
For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
website at www.ti.com.
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at
www.ti.com/sc/package.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2006–2007, Texas Instruments Incorporated
TL5209
500-mA LOW-NOISE LOW-DROPOUT VOLTAGE REGULATOR
WITH SHUTDOWN
www.ti.com
SLVS581A – SEPTEMBER 2006 – REVISED MAY 2007
BLOCK DIAGRAMS
IN
OUT
VOUT
VIN
R1
COUT
ADJ/BYP
+
−
Bandgap
Reference
R2
EN
Current Limiting and
Thermal Shutdown
GND
Figure 1. Low-Noise Adjustable Regulator
2
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CBYP
(optional)
TL5209
500-mA LOW-NOISE LOW-DROPOUT VOLTAGE REGULATOR
WITH SHUTDOWN
www.ti.com
SLVS581A – SEPTEMBER 2006 – REVISED MAY 2007
Absolute Maximum Ratings
(1)
over operating free-air temperature range (unless otherwise noted)
VI
Continuous input voltage range
VO
Output voltage
Tstg
Storage temperature range
(1)
MIN
MAX
–20
20
V
7.5
V
150
°C
–65
UNIT
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating
Conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
Package Thermal Data (1)
(1)
PACKAGE
BOARD
θJA
θJC
SOIC (D)
High K, JESD 51-7
97°C/W
39°C/W
Maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any allowable ambient
temperature is PD = (TJ(max) – TA)/θJA. Operating at the absolute maximum TJ of 150°C can affect reliability.
Recommended Operating Conditions
MIN
VI
Input voltage
VO
Output voltage
VEN
Enable input voltage
TJ
Operating junction temperature range
2.5
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MAX
UNIT
16
V
6.5
V
0
VI
V
–40
125
°C
3
TL5209
500-mA LOW-NOISE LOW-DROPOUT VOLTAGE REGULATOR
WITH SHUTDOWN
www.ti.com
SLVS581A – SEPTEMBER 2006 – REVISED MAY 2007
Electrical Characteristics
VIN = VOUT + 1 V, COUT = 4.7 µF, IOUT = 1 mA, full range TJ = –40°C to 125°C
PARAMETER
Output voltage accuracy
αVOUT
TEST CONDITIONS
VOUT = 2.5 V for ADJ only
Output voltage temperature coefficient
VIN = (VOUT + 1 V) to 16 V
Load regulation
IOUT = 1 mA to 500 mA (1)
IOUT = 1 mA
IOUT = 50 mA
voltage (2)
IOUT = 100 mA
IOUT = 500 mA
VEN ≥ 3 V, IOUT = 1 mA
VEN ≥ 3 V, IOUT = 50 mA
IQ
Quiescent current
VEN ≥ 3 V, IOUT = 100 mA
VEN ≥ 3 V, IOUT = 500 mA
Minimum load current (3)
Imin
Shutdown current
ILIMIT
Vn
VEN
VEN ≤ 0.18 V
Ripple rejection
f = 120 Hz
Current limit
VOUT = 0 V
∆VOUT/∆PD Thermal regulation (4)
Output noise
Enable logic voltage
(2)
(3)
(4)
(5)
4
Full range
–2
2
40
25°C
0.009
Full range
25°C
0.05
Full range
0.5
0.7
25°C
45
60
115
175
Full range
UNIT
%
ppm/°C
0.05
0.1
%/V
%
80
25°C
Full range
250
25°C
150
Full range
250
mV
300
25°C
350
Full range
500
600
25°C
100
Full range
140
170
25°C
350
Full range
650
µA
900
25°C
1.2
2
8
20
Full range
3
25°C
Full range
mA
25
1
25°C
0.05
25°C
0.1
Full range
mA
3
µA
8
25°C
75
25°C
700
Full range
dB
900
1000
25°C
0.05
VOUT = 2.5 V, IOUT = 50 mA,
COUT = 2.2 µF, CBYP = 0
25°C
500
IOUT = 50 mA, COUT = 2.2 µF,
CBYP = 470 pF (5)
25°C
300
VEN = logic LOW (shutdown)
MAX
1
VIN = 16 V, 500-mA load
pulse for t = 10 ms
VEN = logic HIGH (enabled)
(1)
TYP
–1
Full range
VEN ≤ 0.4 V
ISD
MIN
Full range
Line regulation
VIN – VOUT Dropout
TJ
25°C
mA
%/W
nV/√Hz
25°C
0.4
Full range
0.18
25°C
V
2
Low duty cycle testing is used to maintain the junction temperature as close to the ambient temperature as possible. Changes in output
voltage due to thermal effects are covered separately by the thermal regulation specification.
Dropout is defined as the input to output differential at which the output drops 2% below its nominal value measured at 1-V differential.
For stability across the input voltage and temperature. For ADJ versions, the minimum current can be set by R1 and R2.
Thermal regulation is defined as the change in output voltage at a specified time after a change in power dissipation is applied,
excluding line and load regulation effects.
CBYP is optional and connected to the BYP/ADJ pin.
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TL5209
500-mA LOW-NOISE LOW-DROPOUT VOLTAGE REGULATOR
WITH SHUTDOWN
www.ti.com
SLVS581A – SEPTEMBER 2006 – REVISED MAY 2007
Electrical Characteristics (continued)
VIN = VOUT + 1 V, COUT = 4.7 µF, IOUT = 1 mA, full range TJ = –40°C to 125°C
PARAMETER
IEN
Enable input current
TEST CONDITIONS
TJ
MIN
TYP
MAX
VEN ≤ 0.4 V (shutdown)
25°C
0.01
–1
VEN ≤ 0.18 V (shutdown)
Full range
0.01
–2
5
20
VEN ≥ 2 V (enabled)
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25°C
Full range
UNIT
µA
25
5
TL5209
500-mA LOW-NOISE LOW-DROPOUT VOLTAGE REGULATOR
WITH SHUTDOWN
www.ti.com
SLVS581A – SEPTEMBER 2006 – REVISED MAY 2007
TYPICAL CHARACTERISTICS
POWER-SUPPLY REJECTION RATIO
POWER-SUPPLY REJECTION RATIO
0
0
-10
COUT = 2.2 µF
-20
CBYP = 0 µF
-30
IOUT = 1 mA
-20
-30
-40
PSRR – dB
PSRR – dB
-10
VIN = 3.5 V
-50
-60
-70
-110
10
1.E+01
100
1.E+02
1k
1.E+03
10k
1.E+04
100k
1.E+05
-50
-60
-100
1.E+01
10
1M
1.E+06
1.E+03
1k
1.E+04
10k
1.E+05
100k
Frequency – Hz
POWER-SUPPLY REJECTION RATIO
POWER-SUPPLY REJECTION RATIO
1.E+06
1M
0
VIN = 3.5 V
-10
COUT = 2.2 µF
-20
IL = 10 mA
-30
PSRR – dB
CBYP = 0 µF
-50
-60
-70
COUT = 2.2 µF
CBYP = 0.01 µF
IOUT = 10 mA
-40
-50
-60
-80
-90
-90
-100
-110
10
1.E+01
VIN = 3.5 V
-70
-80
100
1.E+02
1k
1.E+03
10k
1.E+04
100k
1.E+05
1M
1.E+06
-100
1.E+01
10
1.E+02
100
1.E+03
1k
1.E+04
10k
Frequency – Hz
– Hz
f –Frequency
Frequency
– Hz
6
1.E+02
100
Frequency – Hz
-10
PSRR – dB
-40
-90
-100
-40
IOUT = 1 mA
-80
-90
-30
COUT = 2.2 µF
CBYP = 0.01 µF
-70
-80
-20
VIN = 3.5 V
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1.E+05
100k
1.E+06
1M
TL5209
500-mA LOW-NOISE LOW-DROPOUT VOLTAGE REGULATOR
WITH SHUTDOWN
www.ti.com
SLVS581A – SEPTEMBER 2006 – REVISED MAY 2007
TYPICAL CHARACTERISTICS (continued)
POWER-SUPPLY REJECTION RATIO
POWER-SUPPLY REJECTION RATIO
0
0
VIN = 3.5 V
-10
CBYP = 0 µF
-20
PSRR – dB
PSRR – dB
-50
-60
-50
-60
-70
-80
-80
-90
-90
1.E+03
1k
1.E+04
10k
1.E+05
100k
-100
10
1.E+01
1.E+06
1M
100
1.E+02
1k
1.E+03
10k
1.E+04
100k
1.E+05
Frequency – Hz
Frequency – Hz
POWER-SUPPLY RIPPLE REJECTION
vs
VOLTAGE DROP
POWER-SUPPLY RIPPLE REJECTION
vs
VOLTAGE DROP
120
1M
1.E+06
120
VOUT = 2.5 V
110
COUT = 2.2 µF
100
CBYP = 0 µF
IL = 1 mA
110
IL = 10 mA
VOUT = 2.5 V
100
90
IL = 1 mA
COUT = 2.2 µF
CBYP = 0.01 µF
90
80
80
IL = 100 mA
70
PSRR – dB
PSRR – dB
IOUT = 100 mA
-40
-70
1.E+02
100
CBYP = 0.01 µF
-30
-40
-100
1.E+01
10
COUT = 2.2 µF
-20
IOUT = 100 mA
-30
VIN = 3.5 V
-10
COUT = 2.2 µF
60
50
IL = 10 mA
70
60
50
40
40
30
30
20
20
10
10
IL = 100 mA
0
0
0
0.1
0.2
0.3
0.4
0.5
0
0.1
0.2
0.3
0.4
0.5
Voltage Drop – V
Voltage Drop – V
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TL5209
500-mA LOW-NOISE LOW-DROPOUT VOLTAGE REGULATOR
WITH SHUTDOWN
www.ti.com
SLVS581A – SEPTEMBER 2006 – REVISED MAY 2007
TYPICAL CHARACTERISTICS (continued)
NOISE PERFORMANCE
NOISE PERFORMANCE
0.7
0.8
VIN = 3.5 V
COUT = 2.2 µF
0.7
0.6
IL = 100 mA
CBYP = 0 µF
Noise
– µV/√Hz
Noise
– µV/sqrt(Hz)
Noise
– µV/√Hz
Noise
– µV/sqrt(Hz)
0.6
IL = 100 mA
0.5
IL = 10 mA
0.4
IL = 1 mA
0.3
IL = 1 mA
0.5
0.4
IL = 10 mA
0.3
0.2
0.2
VIN = 3.5 V
0.1
0.1
COUT = 2.2 µF
CBYP = 0.01 µF
0
10
1.E+01
100
1.E+02
1k
1.E+03
10k
1.E+04
0
10
1.E+01
100k
1.E+05
100
1.E+02
DROPOUT VOLTAGE
vs
LOAD CURRENT
100k
1.E+05
OUTPUT VOLTAGE
vs
TEMPERATURE
2.55
500
VOUT = 2.5 V
450
2.54
COUT = 2.2 µF
CBYP = 0
400
2.53
VOUT – Output Voltage – V
VDO – Dropout Voltage – mV
10k
1.E+04
Frequency – Hz
Frequency – Hz
350
300
250
200
150
100
VIN = 3.5 V
COUT = 4.7 µF
IL = 1 mA
2.52
2.51
2.50
2.49
2.48
2.47
50
2.46
0
0
50 100 150 200 250 300 350 400 450 500
2.45
-40 -25 -10
IL – Load Current – mA
8
1k
1.E+03
5
20 35
50 65 80 95 110 125
TA – Temperature – °C
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TL5209
500-mA LOW-NOISE LOW-DROPOUT VOLTAGE REGULATOR
WITH SHUTDOWN
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SLVS581A – SEPTEMBER 2006 – REVISED MAY 2007
TYPICAL CHARACTERISTICS (continued)
GROUND CURRENT
vs
LOAD CURRENT
GROUND CURRENT
vs
SUPPLY VOLTAGE
2
20
VIN = 3.5 V
1.8
COUT = 4.7 µF
16
CIN = 1 µF
IGND – GND Pin Current – mA
IGND – GND Pin Current – mA
18
14
12
10
8
6
4
2
1.6
IL = 100 mA
1.4
1.2
1
0.8
0.6
0.4
IL = 1 mA
0.2
0
0
0
50 100 150 200 250 300 350 400 450 500
0
1
IL – Load Current – mA
2
4
5
6
7
8
VCC – Supply Voltage – V
GROUND CURRENT
vs
SUPPLY VOLTAGE
OUTPUT VOLTAGE
vs
LOAD CURRENT
20
2.53
VIN = 3.5 V
18
IL = 500 mA
COUT = 4.7 µF
2.52
VOUT – Output Voltage – V
16
IGND – GND Pin Current – mA
3
14
12
10
8
6
4
IL = 1 mA to 500 mA
2.51
TA = 25°C
2.50
TA = 125°C
2.49
2.48
TA = -40°C
2
2.47
0
0
1
2
3
4
5
6
7
8
0
50 100 150 200 250 300 350 400 450 500
IL – Load Current – mA
VCC – Supply Voltage – V
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TL5209
500-mA LOW-NOISE LOW-DROPOUT VOLTAGE REGULATOR
WITH SHUTDOWN
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SLVS581A – SEPTEMBER 2006 – REVISED MAY 2007
TYPICAL CHARACTERISTICS (continued)
OUTPUT IMPEDANCE
vs
FREQUENCY
OUTPUT IMPEDANCE
vs
FREQUENCY
10
VIN = 3.5 V
VIN = 3.5 V
COUT = 1 µF
COUT = 2.2 µF
VENB = 2 V
VENB = 2 V
Output Impedance – Ωℵ
Output Impedance – Ω♦
10
IL = 1 mA
1
IL = 10 mA
IL = 100 mA
0.1
0.01
10
1.E+01
100
1.E+02
1k
1.E+03
10k
1.E+04
100k
1.E+05
IL = 10 mA
IL = 100 mA
0.1
0.01
10
1.E+01
1M
1.E+06
100
1.E+02
1k
1.E+03
10k
1.E+04
100k
1.E+05
Frequency – Hz
Frequency – Hz
OUTPUT VOLTAGE
vs
INPUT VOLTAGE
LOAD REGULATION
2.55
1M
1.E+06
0.5
VIN = 3.5 V to 16 V
2.54
VIN = 3.5 V
COUT = 4.7 µF
2.53
COUT = 4.7 µF
0.4
IL = 1 mA
2.52
Load Regulation – %
VOUT – Output Voltage – V
IL = 1 mA
1
2.51
2.50
TA = 25°C
2.49
TA = 125°C
2.48
TA = -40°C
IL = 1 mA to 500 mA
0.3
0.2
0.1
2.47
2.46
2.45
3
6
9
12
15
18
0
-40 -25 -10
20
35 50
65
80
TA – Temperature – °C
VIN – Input Voltage – V
10
5
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95 110 125
TL5209
500-mA LOW-NOISE LOW-DROPOUT VOLTAGE REGULATOR
WITH SHUTDOWN
www.ti.com
SLVS581A – SEPTEMBER 2006 – REVISED MAY 2007
TYPICAL CHARACTERISTICS (continued)
LINE REGULATION
LOAD TRANSIENT RESPONSE
COUT = 10 µF
0.01
VIN = 3.5 V
Load (mA)
VIN = 3.5 V to 16 V
COUT = 4.7 µF
IL = 100 µA
0.006
Change in
Output Voltage (mV)
Line Regulation – %/V
0.008
0.004
VENB = 2 V
100
CIN = 1 µF
1
10
0
-10
0.002
Time (25 µs/div)
0
-50
-25
0
25
50
75
100
125
TA – Temperature – °C
COUT = 2.2 µF
VIN = 3.5 V
CIN = 1 µF
100
COUT = 10 µF
VIN = 3.5 V
VENB = 2 V
500
CIN = 1 µF
1
1
10
0
-10
Time (25 µs/div)
Change in Output Voltage (mV)
Change in Output
Voltage (mV)
Load (mA)
VENB = 2 V
LOAD TRANSIENT RESPONSE
Load (mA)
LOAD TRANSIENT RESPONSE
20
0
-20
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Time (25 µs/div)
11
TL5209
500-mA LOW-NOISE LOW-DROPOUT VOLTAGE REGULATOR
WITH SHUTDOWN
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SLVS581A – SEPTEMBER 2006 – REVISED MAY 2007
TYPICAL CHARACTERISTICS (continued)
LOAD TRANSIENT RESPONSE
LINE TRANSIENT RESPONSE
VENB = 2 V
500
CIN = 1 µF
100
Change in Output Voltage (mV)
Change in
Output Voltage (mV)
Load (mA)
VIN = 3.5 V
Input Voltage (V)
COUT = 10 µF
40
20
0
-20
COUT = 1 µF
IL = 1 mA
4.5
3.5
20
10
0
-10
Time (500 µs/div)
Time (25 µs/div)
3.5
Input Voltage (V)
COUT = 2.2 µF
IL = 1 mA
4.5
LINE TRANSIENT RESPONSE
Change in Output Voltage (mV)
Change in Output Voltage (mV)
Input Voltage (V)
LINE TRANSIENT RESPONSE
20
10
0
-10
Time (500 µs/div)
3.5
20
10
0
-10
Time (500 µs/div)
12
COUT = 2.2 µF
IL = 100 mA
3.5
20
10
0
-10
LINE TRANSIENT RESPONSE
Change in Output Voltage (mV) Input Voltage (V)
Change in Output Voltage (mV)
Input Voltage (V)
LINE TRANSIENT RESPONSE
4.5
COUT = 1 µF
IL = 100 mA
4.5
COUT = 1 µF
IL = 500 mA
4.5
3.5
20
10
0
-10
Time (500 µs/div)
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Time (500 µs/div)
TL5209
500-mA LOW-NOISE LOW-DROPOUT VOLTAGE REGULATOR
WITH SHUTDOWN
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SLVS581A – SEPTEMBER 2006 – REVISED MAY 2007
TYPICAL CHARACTERISTICS (continued)
COUT = 2.2 µF
IL = 500 mA
4.5
3.5
TURN-ON TIME
Enable Voltage (V)
Change in Output Voltage (mV) Input Voltage (V)
LINE TRANSIENT RESPONSE
Output Voltage (mV)
20
10
0
-10
Time (500 µs/div)
2
0
2
1
COUT = 1 µF
VIN = 3.5 V
0
ILOAD = 10 mA
CIN = 1 µF
Time (50 µs/div)
Enable Voltage (V)
TURN-ON TIME
2
0
2
1
COUT = 1 µF
VIN = 3.5 V
0
ILOAD = 500 mA
CIN = 1 µF
Output Voltage (mV)
Output Voltage (mV)
Enable Voltage (V)
TURN-ON TIME
2
0
2
1
COUT = 2.2 µF
VIN = 3.5 V
0
Time (50 µs/div)
ILOAD = 10 mA
CIN = 1 µF
Time (50 µs/div)
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TL5209
500-mA LOW-NOISE LOW-DROPOUT VOLTAGE REGULATOR
WITH SHUTDOWN
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SLVS581A – SEPTEMBER 2006 – REVISED MAY 2007
TYPICAL CHARACTERISTICS (continued)
SHORT-CIRCUIT CURRENT
vs
SUPPLY VOLTAGE
1000
2
COUT = 2.2 µF
0
ISC – Short-Circuit Current Limit – mA
Output Voltage (mV)
Enable Voltage (V)
TURN-ON TIME
2
1
COUT = 2.2 µF
VIN = 3.5 V
0
ILOAD = 500 mA
CIN = 1 µF
900
800
700
600
Time (50 µs/div)
500
3
6
9
12
15
18
VCC – Supply Voltage – V
800
SHORT-CIRCUIT CURRENT
vs
TIME
CIN = 1 µF
VIN = 3.5 V
COUT = 4.7 µF
VOUT = 0 V
1000
Short-Circuit Current – mA
Short-Circuit Current – mA
SHORT-CIRCUIT CURRENT
vs
TIME
600
400
200
0
CIN = 1 µF
VIN = 16 V
COUT = 4.7 µF
VOUT = 0 V
900
800
600
400
200
0
Time – 10 ms/div
Time – 25 ms/div
14
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500-mA LOW-NOISE LOW-DROPOUT VOLTAGE REGULATOR
WITH SHUTDOWN
www.ti.com
SLVS581A – SEPTEMBER 2006 – REVISED MAY 2007
APPLICATION INFORMATION
Adjustable Output Voltage
The TL5209 develops a 1.242-V reference voltage, VREF, between the output and the adjust terminal. As shown
in Figure 2, this voltage is applied across resistor R1 to generate a constant current. The current IADJ from the
ADJ terminal could introduce dc offset to the output. Because, this offset is very small (about 50 nA), it can be
ignored. The constant current then flows through the output set resistor R2 and sets the output voltage to the
desired level.
The TL5209 adjustable output should not be adjusted above 6.75 V ± 10% due to the internal zener diode
clamping the output voltage above 6.75 V.
Although IADJ is very small, limit R2 to ≤ 470 kΩ for optimum performance.
VIN
IN
OUT
VOUT
R1
1 µF
EN
GND
ADJ/BYP
470 pF
A.
VOUT = 1.242 V (1 + R2/R1)
B.
R2 should be ≤ 470 kΩ for optimal performance.
C.
Maximum VOUT = 6.75 V ± 10%
2.2 µF
R2
Figure 2. Low-Noise Adjustable Regulator
Enable/Shutdown
The EN pin is CMOS-logic compatible. When EN is held high (>2 V), the regulator is active. Likewise, applying a
low signal (<0.4 V at 25°C) to EN or leaving it open shuts down the regulator. If the enable/shutdown feature is
not needed, EN should be tied to VIN.
Input Capacitor
If the input of the regulator is located more than ten inches from the power-supply filter, or if a battery is used to
power the regulator, a minimum 1-µF input capacitor is recommended.
Output Capacitor
As with all PNP regulators, an output capacitor is needed for stability. The required minimum size of this output
capacitor depends on several factors, one of which is whether a bypass capacitor is used.
• With no bypass capacitor, a minimum COUT of 1 µF is recommended.
• With a bypass capacitor of 470 pF (see Figure 2), a minimum COUT of 2.2 µF is recommended.
• Larger values of COUT are beneficial, because they improve the regulator transient response.
Another factor that can determine the minimum size of the output capacitor is the load current. At low loads, a
smaller output capacitor is needed for stability.
The equivalent series resistance (ESR) of the output capacitor also can affect regulator stability. COUT should
have an ESR of ≈1 Ω, and it should have a resonant frequency above 1 MHz. Too low an ESR can cause the
output to have a low-amplitude oscillation and/or underdamped transient response. Most tantalum or aluminum
electrolytic capacitors can be used for the output capacitors. However, care should be used at low temperatures,
because aluminum electrolytics use electrolytes that can freeze at low temperature (≈ –30°C). Solid tantalum
capacitors do not exhibit this problem and should be used below –25°C.
Submit Documentation Feedback
15
TL5209
500-mA LOW-NOISE LOW-DROPOUT VOLTAGE REGULATOR
WITH SHUTDOWN
www.ti.com
SLVS581A – SEPTEMBER 2006 – REVISED MAY 2007
APPLICATION INFORMATION (continued)
Bypass Capacitor
An optional bypass capacitor, CBYP, can be externally connected to the regulator via the BYP pin for improved
noise performance. Connected to the internal voltage divider and the error amplifier of the regulator, this bypass
capacitor filters the noise of the internal reference and reduces the noise effects on the error amplifier. The
overall result is a significant drop in output noise of the regulator. A 470-pF bypass capacitor is recommended.
Adding a bypass capacitor has several effects on the regulator that must be taken into account. First, the bypass
capacitor reduces the phase margin of the regulator and, thus, the minimum COUT needs to be increased to 2.2
µF, as previously mentioned. Second, upon startup of the regulator, the bypass capacitor has an effect on the
regulator turn-on time. If a slow ramp-up of the output is needed, larger values of CBYP should be used.
Conversely, if a fast ramp-up of the output is needed, use a smaller CBYP or none at all.
If a bypass capacitor is not needed, BYP should be left open.
Low-Voltage Operation
When using the TL5209 in voltage-sensitive applications, special considerations are required. If appropriate
output and bypass capacitors are not chosen properly, these devices may experience a temporary overshoot of
their nominal voltages.
At start-up, the full input voltage is initially applied across the regulator pass transistor, causing it to be
temporarily fully turned on. By contrast, the error amplifier and voltage-reference circuits, being powered from
the output, are not powered up as fast. In order to slow down the output ramp and give the error amplifier time to
respond, select larger values of output and bypass capacitors. The longer ramp time of the output allows the
regulator enough time to respond and keeps the output from overshooting its nominal value.
To prevent an overshoot when starting up into a light load (≈100 µA), 4.7-µF and 470-pF capacitors are
recommended for the output and bypass capacitors, respectively. At higher loads, 10-µF and 470-pF capacitors
should be used.
If the application is not too sensitive to regulator overshoot, both the output capacitor and bypass capacitor (if
applicable) can be reduced.
16
Submit Documentation Feedback
PACKAGE OPTION ADDENDUM
www.ti.com
27-Mar-2009
PACKAGING INFORMATION
Orderable Device
Status (1)
Package
Type
Package
Drawing
Pins Package Eco Plan (2)
Qty
TL5209DR
ACTIVE
SOIC
D
8
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TL5209DRG4
ACTIVE
SOIC
D
8
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
Lead/Ball Finish
MSL Peak Temp (3)
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in
a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check
http://www.ti.com/productcontent for the latest availability information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and
package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS
compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder
temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is
provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the
accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take
reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on
incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited
information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI
to Customer on an annual basis.
Addendum-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
27-Mar-2009
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device
TL5209DR
Package Package Pins
Type Drawing
SOIC
D
8
SPQ
Reel
Reel
Diameter Width
(mm) W1 (mm)
2500
330.0
12.4
Pack Materials-Page 1
A0 (mm)
B0 (mm)
K0 (mm)
P1
(mm)
6.4
5.2
2.1
8.0
W
Pin1
(mm) Quadrant
12.0
Q1
PACKAGE MATERIALS INFORMATION
www.ti.com
27-Mar-2009
*All dimensions are nominal
Device
Package Type
Package Drawing
Pins
SPQ
Length (mm)
Width (mm)
Height (mm)
TL5209DR
SOIC
D
8
2500
340.5
338.1
20.6
Pack Materials-Page 2
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