TL5209-25KTTR [TI]
500-mA LOW-NOISE LOW-DROPOUT VOLTAGE REGULATOR WITH SHUTDOWN; 500 mA的低噪声，低压差电压关断稳压器
| 型号： | TL5209-25KTTR |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | 500-mA LOW-NOISE LOW-DROPOUT VOLTAGE REGULATOR WITH SHUTDOWN |
| 文件： | 总22页 (文件大小：371K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TL5209
500-mA LOW-NOISE LOW-DROPOUT VOLTAGE REGULATOR
WITH SHUTDOWN
www.ti.com
SLVS581–SEPTEMBER 2006
FEATURES
•
Adjustable and Fixed Voltages of 1.8 V, 2.5 V,
3 V, 3.3 V, and 5 V
•
•
•
•
Current Limiting and Thermal Protection
Stable With Minimum Load of 1 mA
Reverse-Battery Protection
Applications
•
•
•
1%/2% Accuracy (25°C/Full Range)
500-mV (Max) Dropout at Full Load of 500 mA
Extremely Tight Regulation Over Temperature
Range
– Portable Applications (PDAs, Laptops,
Cell Phones)
– 0.1%/V (Max) Line Regulation
– 0.7% (Max) Load Regulation
– Consumer Electronics
– Post-Regulation for SMPS
•
•
•
Ultra-Low Noise Capability (300 nV/√Hz Typ)
Shutdown Current of 3 µA (Max)
Low Temperature Coefficient
•
Available in Convenient Surface-Mount
Packages: SOT-223, SOIC-8, and TO-263
FIXED VOLTAGE . . . DCY (SOT-223) PACKAGE
(TOP VIEW)
ADJUSTABLE VOLTAGE . . . D PACKAGE
(TOP VIEW)
FIXED VOLTAGE . . . D PACKAGE
(TOP VIEW)
GND
GND
GND
GND
GND
1
2
3
4
8
7
6
5
EN
IN
GND
GND
GND
GND
1
2
3
4
8
7
6
5
EN
IN
OUT
ADJ/BYP
OUT
BYP
1
2
3
FIXED VOLTAGE . . . KTT (TO-263) PACKAGE
(TOP VIEW)
ADJUSTABLE VOLTAGE . . . KTT (TO-263) PACKAGE
(TOP VIEW)
5
5
4
3
ADJ/BYP
OUT
GND
IN
BYP
OUT
GND
IN
4
3
2
2
1
1
EN
EN
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 (SOIC-8 and TO-263) 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 BYPASS pin (SOIC-8 and TO-263), 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 in adjustable output and fixed-output versions of 1.8 V, 2.5 V, 3 V, 3.3 V, and 5 V.
Offered in surface-mount packages of SOT-223, SOIC, and TO-263, the TL5209 is characterized for operation
over the virtual junction temperature ranges of –40°C to 125°C.
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.
Copyright © 2006, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
TL5209
500-mA LOW-NOISE LOW-DROPOUT VOLTAGE REGULATOR
WITH SHUTDOWN
www.ti.com
SLVS581–SEPTEMBER 2006
ORDERING INFORMATION
VOUT
(NOM)
TJ
PACKAGE(1)
ORDERABLE PART NUMBER
TOP-SIDE MARKING
SOIC – D
Reel of 2000
Reel of 2000
Reel of 2000
Reel of 2000
Reel of 2000
Reel of 2000
Reel of 2000
Reel of 2000
Reel of 2000
Reel of 2000
Reel of 2000
Reel of 2000
Reel of 2000
Reel of 2000
Reel of 2000
Reel of 2000
Reel of 2000
TL5209-18DR
TL520918
TA
1.8 V
SOT-223 – DCY
TO-263 – KTT
SOIC – D
TL5209-18DCYR
TL5209-18KTTR
TL5209-25DR
TL5209-18
TL520925
TB
2.5 V
3 V
SOT-223 – DCY
TO-263 – KTT
SOIC – D
TL5209-25DCYR
TL5209-25KTTR
TL5209-30DR
TL5209-25
TL520930
TC
SOT-223 – DCY
TO-263 – KTT
SOIC – D
TL5209-30DCYR
TL5209-30KTTR
TL5209-33DR
–40°C to 125°C
TL5209-30
TL520933
TD
3.3 V
SOT-223 – DCY
TO-263 – KTT
SOIC – D
TL5209-33DCYR
TL5209-33KTTR
TL5209-50DR
TL5209-33
TL520950
TE
5 V
SOT-223 – DCY
TO-263 – KTT
SOIC – D
TL5209-50DCYR
TL5209-50KTTR
TL5209DR
TL5209-50
TL5209
TL5209
ADJ
TO-263 – KTT
TL5209KTTR
(1) Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at
www.ti.com/sc/package.
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TL5209
500-mA LOW-NOISE LOW-DROPOUT VOLTAGE REGULATOR
WITH SHUTDOWN
www.ti.com
SLVS581–SEPTEMBER 2006
BLOCK DIAGRAMS
IN
OUT
V
OUT
V
IN
C
OUT
R1
R2
+
−
Bandgap
Reference
Current Limiting and
Thermal Shutdown
GND
Figure 1. Fixed Regulator (SOT-223 only)
IN
OUT
BYP
V
V
IN
OUT
C
R1
OUT
+
−
Bandgap
Reference
EN
C
BYP
R2
(optional)
Current Limiting and
Thermal Shutdown
GND
Figure 2. Low-Noise Fixed Regulator (SOIC and TO-263 only)
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TL5209
500-mA LOW-NOISE LOW-DROPOUT VOLTAGE REGULATOR
WITH SHUTDOWN
www.ti.com
SLVS581–SEPTEMBER 2006
BLOCK DIAGRAMS (continued)
IN
OUT
V
OUT
V
IN
C
OUT
R1
R2
ADJ/BYP
+
−
Bandgap
C
Reference
BYP
(optional)
EN
Current Limiting and
Thermal Shutdown
GND
Figure 3. Low-Noise Adjustable Regulator (SOIC and TO-263 only)
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TL5209
500-mA LOW-NOISE LOW-DROPOUT VOLTAGE REGULATOR
WITH SHUTDOWN
www.ti.com
SLVS581–SEPTEMBER 2006
Absolute Maximum Ratings(1)
over operating free-air temperature range (unless otherwise noted)
MIN
–20
–65
MAX UNIT
VI
Continuous input voltage range
Storage temperature range
20
V
Tstg
150
°C
(1) 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)
PACKAGE
SOIC (D)
BOARD
θJA
θJC
High K, JESD 51-7
High K, JESD 51-7
High K, JESD 51-5
97°C/W
53°C/W
26.5°C/W
39°C/W
4°C/W
SOT-223 (DCY)
TO-263 (KTT)
31.8°C/W
(1) 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
2.5
0
MAX
16
UNIT
V
VI
Input voltage
VEN
TJ
Enable input voltage
VI
V
Operating junction temperature range
–40
125
°C
5
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TL5209
500-mA LOW-NOISE LOW-DROPOUT VOLTAGE REGULATOR
WITH SHUTDOWN
www.ti.com
SLVS581–SEPTEMBER 2006
Electrical Characteristics
VIN = VOUT + 1 V, COUT = 4.7 µF, IOUT = 1 mA, full range TJ = –40°C to 125°C
PARAMETER
TEST CONDITIONS
TJ
MIN
–1
TYP
MAX UNIT
25°C
1
Output voltage accuracy
Output voltage temperature coefficient
Line regulation
VOUT = 2.5 V for ADJ only
%
2
Full range
Full range
25°C
–2
αVOUT
40
ppm/°C
0.009
0.05
%/V
0.1
VIN = (VOUT + 1 V) to 16 V
IOUT = 1 mA to 500 mA(1)
IOUT = 1 mA
Full range
25°C
0.05
45
0.5
%
Load regulation
Full range
25°C
0.7
60
80
Full range
25°C
115
150
350
100
350
1.2
8
175
IOUT = 50 mA
Full range
25°C
250
mV
250
VIN – VOUT Dropout voltage(2)
IOUT = 100 mA
Full range
25°C
300
500
600
140
IOUT = 500 mA
Full range
25°C
V
V
V
V
EN ≥ 3 V, IOUT = 1 mA
EN ≥ 3 V, IOUT = 50 mA
EN ≥ 3 V, IOUT = 100 mA
EN ≥ 3 V, IOUT = 500 mA
Full range
25°C
170
µA
650
Full range
25°C
900
2
IQ
Quiescent current
Full range
25°C
3
mA
20
Full range
Full range
25°C
25
Imin
Minimum load current(3)
Shutdown current
1
3
mA
V
EN ≤ 0.4 V
0.05
0.1
ISD
25°C
µA
V
EN ≤ 0.18 V
Full range
25°C
8
Ripple rejection
Current limit
f = 120 Hz
VOUT = 0 V
75
dB
25°C
700
900
ILIMIT
mA
Full range
1000
VIN = 16 V, 500-mA load
pulse for t = 10 ms
∆VOUT/∆PD Thermal regulation(4)
25°C
25°C
25°C
0.05
500
300
%/W
VOUT = 2.5 V, IOUT = 50 mA,
COUT = 2.2 µF, CBYP = 0
Vn
Output noise
nV/√Hz
IOUT = 50 mA, COUT = 2.2 µF,
CBYP = 470 pF(5)
25°C
Full range
25°C
0.4
VEN = logic LOW (shutdown)
VEN = logic HIGH (enabled)
VEN
Enable logic voltage
0.18
V
2
(1) 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.
(2) Dropout is defined as the input to output differential at which the output drops 2% below its nominal value measured at 1-V differential.
(3) For stability across the input voltage and temperature. For ADJ versions, the minimum current can be set by R1 and R2.
(4) 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.
(5) 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
SLVS581–SEPTEMBER 2006
Electrical Characteristics (continued)
VIN = VOUT + 1 V, COUT = 4.7 µF, IOUT = 1 mA, full range TJ = –40°C to 125°C
PARAMETER
TEST CONDITIONS
EN ≤ 0.4 V (shutdown)
EN ≤ 0.18 V (shutdown)
TJ
MIN
TYP
0.01
0.01
5
MAX UNIT
V
V
25°C
–1
Full range
25°C
–2
µA
20
IEN
Enable input current
VEN ≥ 2 V (enabled)
Full range
25
7
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TL5209
500-mA LOW-NOISE LOW-DROPOUT VOLTAGE REGULATOR
WITH SHUTDOWN
www.ti.com
SLVS581–SEPTEMBER 2006
TYPICAL CHARACTERISTICS
POWER-SUPPLY REJECTION RATIO
POWER-SUPPLY REJECTION RATIO
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
VIN = 3.5 V
VIN = 3.5 V
COUT = 2.2 µF
CBYP = 0.01 µF
IOUT = 1 mA
COUT = 2.2 µF
CBYP = 0 µF
IOUT = 1 mA
10 100
1k 1M
10k 100k
10
100
1k
10k
100k
1M
Frequency – Hz
Frequency – Hz
POWER-SUPPLY REJECTION RATIO
POWER-SUPPLY REJECTION RATIO
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-10
VIN = 3.5 V
VIN = 3.5 V
-20
-30
COUT = 2.2 µF
CBYP = 0.01 µF
IOUT = 10 mA
COUT = 2.2 µF
C
BYP = 0 µF
IL = 10 mA
-40
-50
-60
-70
-80
-90
-100
-110
10
100
1k
10k
100k
1M
10
100
1k
10k
100k
1M
Frequency – Hz
Frequency – Hz
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TL5209
500-mA LOW-NOISE LOW-DROPOUT VOLTAGE REGULATOR
WITH SHUTDOWN
www.ti.com
SLVS581–SEPTEMBER 2006
TYPICAL CHARACTERISTICS (continued)
POWER-SUPPLY REJECTION RATIO
POWER-SUPPLY REJECTION RATIO
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
VIN = 3.5 V
VIN = 3.5 V
COUT = 2.2 µF
CBYP = 0.01 µF
IOUT = 100 mA
COUT = 2.2 µF
CBYP = 0 µF
IOUT = 100 mA
10
100
1k
10k
100k
1M
10 100
1k
10k
100k
1M
Frequency – Hz
Frequency – Hz
POWER-SUPPLY RIPPLE REJECTION
POWER-SUPPLY RIPPLE REJECTION
vs
vs
VOLTAGE DROP
VOLTAGE DROP
120
110
100
90
80
70
60
50
40
30
20
10
0
120
110
100
90
80
70
60
50
40
30
20
10
0
VOUT = 2.5 V
COUT = 2.2 µF
CBYP = 0 µF
IL = 1 mA
VOUT = 2.5 V
IL = 1 mA
IL = 10 mA
COUT = 2.2 µF
CBYP = 0.01 µF
IL = 10 mA
IL = 100 mA
IL = 100 mA
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
Figure 4.
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TL5209
500-mA LOW-NOISE LOW-DROPOUT VOLTAGE REGULATOR
WITH SHUTDOWN
www.ti.com
SLVS581–SEPTEMBER 2006
TYPICAL CHARACTERISTICS (continued)
NOISE PERFORMANCE
NOISE PERFORMANCE
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
VIN = 3.5 V
COUT = 2.2 µF
CBYP = 0 µF
IL = 100 mA
IL = 1 mA
IL = 100 mA
IL = 10 mA
IL = 10 mA
IL = 1 mA
VIN = 3.5 V
COUT = 2.2 µF
CBYP = 0.01 µF
10
100
1k
10k
100k
10
100
1k
10k
100k
Frequency – Hz
Frequency – Hz
DROPOUT VOLTAGE
vs
LOAD CURRENT
OUTPUT VOLTAGE
vs
TEMPERATURE
2.55
2.54
2.53
2.52
2.51
2.50
2.49
2.48
2.47
2.46
2.45
500
450
400
350
300
250
200
150
100
50
VOUT = 2.5 V
VIN = 3.5 V
COUT = 2.2 µF
CBYP = 0
COUT = 4.7 µF
IL = 1 mA
0
0
50 100 150 200 250 300 350 400 450 500
IL – Load Current – mA
-40 -25 -10
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
www.ti.com
SLVS581–SEPTEMBER 2006
TYPICAL CHARACTERISTICS (continued)
GROUND CURRENT
GROUND CURRENT
vs
SUPPLY VOLTAGE
vs
LOAD CURRENT
2
1.8
1.6
1.4
1.2
1
20
18
VIN = 3.5 V
COUT = 4.7 µF
CIN = 1 µF
16
14
12
10
8
IL = 100 mA
0.8
0.6
0.4
0.2
0
6
4
IL = 1 mA
2
0
0
50 100 150 200 250 300 350 400 450 500
IL – Load Current – mA
0
1
2
3
4
5
6
7
8
VCC – Supply Voltage – V
GROUND CURRENT
vs
SUPPLY VOLTAGE
OUTPUT VOLTAGE
vs
LOAD CURRENT
20
18
16
14
12
10
8
2.53
2.52
2.51
2.50
2.49
2.48
2.47
VIN = 3.5 V
COUT = 4.7 µF
IL = 500 mA
IL = 1 mA to 500 mA
TA = 25°C
TA = 125°C
6
4
TA = -40°C
2
0
0
50 100 150 200 250 300 350 400 450 500
IL – Load Current – mA
0
1
2
3
4
5
6
7
8
V
CC – Supply Voltage – V
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500-mA LOW-NOISE LOW-DROPOUT VOLTAGE REGULATOR
WITH SHUTDOWN
www.ti.com
SLVS581–SEPTEMBER 2006
TYPICAL CHARACTERISTICS (continued)
OUTPUT IMPEDANCE
vs
OUTPUT IMPEDANCE
vs
FREQUENCY
FREQUENCY
10
10
VIN = 3.5 V
VIN = 3.5 V
OUT = 2.2 µF
VENB = 2 V
COUT = 1 µF
VENB = 2 V
C
IL = 1 mA
IL = 10 mA
IL = 100 mA
IL = 1 mA
IL = 10 mA
IL = 100 mA
1
1
0.1
0.01
0.1
0.01
10
100
1k
10k
100k
1M
10
100
1k
10k
100k
1M
Frequency – Hz
Frequency – Hz
OUTPUT VOLTAGE
vs
INPUT VOLTAGE
LOAD REGULATION
2.55
0.5
VIN = 3.5 V to 16 V
COUT = 4.7 µF
IL = 1 mA
VIN = 3.5 V
2.54
2.53
2.52
2.51
2.50
2.49
2.48
2.47
2.46
2.45
COUT = 4.7 µF
0.4
0.3
0.2
0.1
0
IL = 1 mA to 500 mA
TA = 25°C
TA = 125°C
TA = -40°C
-40 -25 -10
5
20 35 50 65 80 95 110 125
A – Temperature – °C
3
6
9
12
15
18
T
VIN – Input Voltage – V
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500-mA LOW-NOISE LOW-DROPOUT VOLTAGE REGULATOR
WITH SHUTDOWN
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SLVS581–SEPTEMBER 2006
TYPICAL CHARACTERISTICS (continued)
LINE REGULATION
LOAD TRANSIENT RESPONSE
COUT = 10 µF
VIN = 3.5 V
VENB = 2 V
CIN = 1 µF
0.01
0.008
0.006
0.004
0.002
0
VIN = 3.5 V to 16 V
COUT = 4.7 µF
IL = 100 µA
100
1
10
0
-10
Time (25 µs/div)
-50
-25
0
25
50
75
100
125
TA – Temperature – °C
LOAD TRANSIENT RESPONSE
LOAD TRANSIENT RESPONSE
COUT = 10 µF
COUT = 2.2 µF
VIN = 3.5 V
VENB = 2 V
CIN = 1 µF
V
IN = 3.5 V
ENB = 2 V
V
500
C
IN = 1 µF
100
1
1
10
0
20
0
-10
-20
Time (25 µs/div)
Time (25 µs/div)
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500-mA LOW-NOISE LOW-DROPOUT VOLTAGE REGULATOR
WITH SHUTDOWN
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SLVS581–SEPTEMBER 2006
TYPICAL CHARACTERISTICS (continued)
LOAD TRANSIENT RESPONSE
LINE TRANSIENT RESPONSE
COUT = 10 µF
IN = 3.5 V
V
COUT = 1 µF
IL = 1 mA
VENB = 2 V
CIN = 1 µF
4.5
3.5
500
100
40
20
10
0
20
0
-10
-20
Time (500 µs/div)
Time (25 µs/div)
LINE TRANSIENT RESPONSE
LINE TRANSIENT RESPONSE
COUT = 2.2 µF
IL = 1 mA
COUT = 1 µF
IL = 100 mA
4.5
3.5
4.5
3.5
20
20
10
0
10
0
-10
-10
Time (500 µs/div)
Time (500 µs/div)
LINE TRANSIENT RESPONSE
LINE TRANSIENT RESPONSE
COUT = 1 µF
IL = 500 mA
COUT = 2.2 µF
IL = 100 mA
4.5
4.5
3.5
3.5
20
20
10
0
10
0
-10
-10
Time (500 µs/div)
Time (500 µs/div)
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500-mA LOW-NOISE LOW-DROPOUT VOLTAGE REGULATOR
WITH SHUTDOWN
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SLVS581–SEPTEMBER 2006
TYPICAL CHARACTERISTICS (continued)
LINE TRANSIENT RESPONSE
TURN-ON TIME
2
0
COUT = 2.2 µF
IL = 500 mA
4.5
3.5
20
2
1
0
10
0
COUT = 1 µF
VIN = 3.5 V
ILOAD = 10 mA
CIN = 1 µF
-10
Time (500 µs/div)
Time (50 µs/div)
TURN-ON TIME
TURN-ON TIME
2
0
2
0
2
1
0
2
1
0
COUT = 1 µF
COUT = 2.2 µF
VIN = 3.5 V
VIN = 3.5 V
ILOAD = 500 mA
CIN = 1 µF
ILOAD = 10 mA
CIN = 1 µF
Time (50 µs/div)
Time (50 µs/div)
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500-mA LOW-NOISE LOW-DROPOUT VOLTAGE REGULATOR
WITH SHUTDOWN
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SLVS581–SEPTEMBER 2006
TYPICAL CHARACTERISTICS (continued)
SHORT-CIRCUIT CURRENT
vs
TURN-ON TIME
SUPPLY VOLTAGE
1000
900
800
700
600
500
2
0
COUT = 2.2 µF
2
1
0
COUT = 2.2 µF
VIN = 3.5 V
ILOAD = 500 mA
CIN = 1 µF
Time (50 µs/div)
3
6
9
12
15
18
VCC – Supply Voltage – V
SHORT-CIRCUIT CURRENT
SHORT-CIRCUIT CURRENT
vs
vs
TIME
TIME
CIN = 1 µF
VIN = 16 V
CIN = 1 µF
VIN = 3.5 V
COUT = 4.7 µF VOUT = 0 V
800
600
400
COUT = 4.7 µF VOUT = 0 V
1000
900
800
600
200
0
400
200
0
Time – 10 ms/div
Time – 25 ms/div
16
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TL5209
500-mA LOW-NOISE LOW-DROPOUT VOLTAGE REGULATOR
WITH SHUTDOWN
www.ti.com
SLVS581–SEPTEMBER 2006
TYPICAL APPLICATION CIRCUITS
IN
OUT
V
OUT
= 2.5 V ± 1%
V
IN
= 3.3 V
1 µF
2.2 µF
GND
Figure 5. Fixed 2.5-V Regulator (TL5209-25, SOT-223)
IN
OUT
BYP
V
= 3.3 V ± 1%
V
IN
= 5 V
OUT
1 µF
2.2 µF
EN
GND
470 pF
Figure 6. Fixed 3.3-V Low-Noise Regulator (TL5209-33, SOIC-8, or TO-263)
†
V
IN
IN
OUT
V
OUT
R1
R2
1 µF
2.2 µF
ADJ/BYP
EN
GND
470 pF
A. VOUT = 1.242 V (1 + R2/R1)
B. R2 should be ≤ 470 kΩ for optimal performance.
Figure 7. Low-Noise Adjustable Regulator (TL5209, SOIC-8, or TO-263)
17
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TL5209
500-mA LOW-NOISE LOW-DROPOUT VOLTAGE REGULATOR
WITH SHUTDOWN
www.ti.com
SLVS581–SEPTEMBER 2006
APPLICATION INFORMATION
Enable/Shutdown
The enable function is only available in the SOIC (D) and TO-263 (KTT) packages. 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 6), 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.
Bypass Capacitor
An optional bypass capacitor, CBYP, can be externally connected to the regulator via the BYP pin for improved
noise performance (only for SOIC and TO-263 packages). 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 TL5209-18 and TL5209-25 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.
18
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TL5209
500-mA LOW-NOISE LOW-DROPOUT VOLTAGE REGULATOR
WITH SHUTDOWN
www.ti.com
SLVS581–SEPTEMBER 2006
APPLICATION INFORMATION (continued)
If the application is not too sensitive to regulator overshoot, both the output capacitor and bypass capacitor (if
applicable) can be reduced.
Adjustable Output Version
For the adjustable version, the output voltage is set by two external resistors forming a voltage divider connected
to the output and the ADJ pin (see Figure 7). VOUT is set based on the equation:
VOUT = 1.242 V(1 + R2/R1)
Although ADJ represents a high-impedance input, limit R2 to ≤ 470 kΩ for optimum performance.
19
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PACKAGE OPTION ADDENDUM
www.ti.com
2-Nov-2006
PACKAGING INFORMATION
Orderable Device
TL5209DR
Status (1)
ACTIVE
ACTIVE
Package Package
Pins Package Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)
Qty
Type
Drawing
SOIC
D
8
2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
TL5209DRG4
SOIC
D
8
2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
(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.
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Addendum-Page 1
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