TPS72501KTTR [TI]
LOW INPUT VOLTAGE, 1-A LOW-DROPOUT LINEAR REGULATORS WITH SUPERVISOR; 低输入电压， 1 -A低压差线性带有监控稳压器
| 型号： | TPS72501KTTR |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | LOW INPUT VOLTAGE, 1-A LOW-DROPOUT LINEAR REGULATORS WITH SUPERVISOR |
| 文件： | 总22页 (文件大小：717K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TPS72501
TPS72515, TPS72516
TPS72518, TPS72525
www.ti.com
SLVS341D–MAY 2002–REVISED MARCH 2004
LOW INPUT VOLTAGE, 1-A LOW-DROPOUT LINEAR REGULATORS WITH SUPERVISOR
FEATURES
DESCRIPTION
•
1-A Output Current
The TPS725xx family of 1-A low-dropout (LDO) linear
regulators has fixed voltage options available that are
commonly used to power the latest DSPs, FPGAs,
and microcontrollers. An adjustable option ranging
from 1.22 V to 5.5 V is also available. The integrated
supervisory circuitry provides an active low RESET
signal when the output falls out of regulation. The no
capacitor/any capacitor feature allows the customer
to tailor output transient performance as needed.
Therefore, compared to other regulators capable of
providing the same output current, this family of
regulators can provide a stand-alone power supply
solution or a post regulator for a switch mode power
supply.
•
Available in 1.5-V, 1.6-V, 1.8-V, 2.5-V
Fixed-Output and Adjustable Versions
(1.2-V to 5.5-V)
•
•
Input Voltage Down to 1.8 V
Low 170-mV Dropout Voltage at 1 A
(TPS72525)
•
•
Stable With Any Type/Value Output Capacitor
Integrated Supervisor (SVS) With 50-ms
RESET Delay Time
•
Low 210-µA Ground Current at Full Load
(TPS72525)
•
•
Less than 1-µA Standby Current
These regulators are ideal for higher current appli-
cations. The family operates over a wide range of
input voltages (1.8 V to 6 V) and has very low
dropout (170 mV at 1-A).
±2% Output Voltage Tolerance Over Line,
Load, and Temperature (-40°C to 125°C)
•
•
•
Integrated UVLO
Ground current is typically 210 µA at full load and
drops to less than 80 µA at no load. Standby current
is less than 1 µA.
Thermal and Overcurrent Protection
5-Lead SOT223-5 or DDPAK and 8-Pin SOP
(TPS72501 only) Surface Mount Package
Each regulator option is available in either
a
SOT223-5, D (TPS72501 only), or DDPAK package.
With a low input voltage and properly heatsinked
package, the regulator dissipates more power and
achieves higher efficiencies than similar regulators
requiring 2.5 V or more minimum input voltage and
higher quiescent currents. These features make it a
viable power supply solution for portable, bat-
tery-powered equipment.
APPLICATIONS
•
•
•
•
PCI Cards
Modem Banks
Telecom Boards
DSP, FPGA, and Microprocessor Power
Supplies
•
Portable, Battery-Powered Applications
DCQ PACKAGE
SOT223-5
(TOP VIEW)
KTT PACKAGE
DDPAK
(TOP VIEW)
D PACKAGE
(TOP VIEW)
1
ENABLE
OUT
FB
GND
NC
IN
1
2
3
4
8
7
6
5
2
IN
GND
GND
ENABLE
3
GND
OUT
1
2 3 4 5
4
5
RESET/FB
NC − No internal connection
NOTE: TPS72501 replaces RESET with FB. Tab is GND for the DCK and KTT packages.
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 © 2002–2004, Texas Instruments Incorporated
TPS72501
TPS72515, TPS72516
TPS72518, TPS72525
www.ti.com
SLVS341D–MAY 2002–REVISED MARCH 2004
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
DESCRIPTION (CONTINUED)
Although an output capacitor is not required for stability, transient response and output noise are improved with a
10-µF output capacitor.
Unlike some regulators that have a minimum current requirement, the TPS725 family is stable with no output
load current. The low noise capability of this family, coupled with its high current operation and ease of power
dissipation, make it ideal for telecom boards, modem banks, and other noise-sensitive applications.
ORDERING INFORMATION
TJ
VOLTAGE(1)
SOT223-5(2)
TPS72501DCQ
TPS72515DCQ
TPS72516DCQ
TPS72518DCQ
TPS72525DCQ
SYMBOL
PS72501
PS72515
PS72516
PS72518
PS72525
DDPAK(3)
D(4)
SYMBOL
TPS72501
TPS72515
TPS72516
TPS72518
TPS72525
Adjustable (1.2 V to 5 V)
TPS72501KTT
TPS72515KTT
TPS72516KTT
TPS72518KTT
TPS72525KTT
TPS72501D
1.5 V
1.6 V
1.8 V
2.5 V
—
—
—
—
-40°C to
125°C
(1) Other voltage options are available upon request from the manufacturer.
(2) To order a taped and reeled part, add the suffix R to the part number (e.g., TPS72501DCQR).
(3) To order a 50-piece reel, add the suffix T (e.g., TPS72501KTTT); to order a 500-piece reel, add the suffix R (e.g., TPS72501KTTR).
(4) To order a taped and reeled part, add the suffix R or T (2500 or 500) to the part number (e.g. TPS72501DR)
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range unless otherwise noted(1)
UNIT
(2)
Input voltage, VI
-0.3 to 7
V
V
Voltage range at EN, FB
-0.3 to VI + 0.3
Voltage on OUT, RESET
6
2
V
ESD rating, HBM
kV
Continuous total power dissipation
Operating junction temperature range, TJ
Maximum junction temperature range, TJ
Storage temperature, Tstg
See Dissipation Ratings Table
-50 to 150
150
°C
°C
°C
-65 to 150
(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.
(2) All voltage values are with respect to network ground terminal.
RECOMMENDED OPERATING CONDITIONS
MIN NOM MAX UNIT
(1)
Input voltage, VI
1.8
0
6
1
V
A
Continuous output current, IO
Operating junction temperature, TJ
-40
125 °C
(1) Minimum VI = VO (nom) + VDO
.
2
TPS72501
TPS72515, TPS72516
TPS72518, TPS72525
www.ti.com
SLVS341D–MAY 2002–REVISED MARCH 2004
PACKAGE DISSIPATION RATINGS
PACKAGE
DDPAK
SOT223
D-8
BOARD
High K(1)
Low K(2)
High K(1)
RθJC
RθJA
2 °C/W
23 °C/W
15 °C/W
53 °C/W
55 °C/W
39.4 °C/W
(1) The JEDEC high-K (2s2p) board design used to derive this data was a 3-inch x 3-inch (7.5-cm x 7.5-cm), multilayer board with 1 ounce
internal power and ground planes and 2 ounce copper traces on top and bottom of the board.
(2) The JEDEC low-K (1s) board design used to derive this data was a 3-inch x 3-inch (7.5-cm x 7.5-cm), two-layer board with 2 ounce
copper traces on top of the board.
ELECTRICAL CHARACTERISTICS
over recommended operating free-air temperature range VI = VO(typ) + 1 V, IO= 1 mA, EN = IN, Co = 1 µF, Ci = 1 µF (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNIT
Bandgap voltage reference
1.177
1.220
1.263
V
TPS72501
Adjustable
0 µA < IO < 1 A(1)
1.22 V ≤ VO ≤ 5.5 V 0.965 VO
1.035 VO
TJ = 25°C
1.5
1.6
1.8
2.5
TPS72515
0 µA< IO < 1 A
TJ = 25°C
1.8 V ≤ VI ≤ 5.5 V
2.6 V ≤ VI ≤ 5.5 V
2.8 V ≤ VI ≤ 5.5 V
3.5 V ≤ VI ≤ 5.5 V
1.47
1.568
1.764
2.45
1.53
1.632
1.836
TPS72516
TPS72518
TPS72525
VO
Output voltage
V
0 µA < IO < 1 A
TJ = 25°C
0 µA < IO < 1 A
TJ = 25°C
0 µA < IO < 1 A
IO = 0 µA
2.55
120
300
75
210
0.2
I
Ground current
µA
IO = 1 A
EN < 0.4 V
EN < 0.4 V
TJ = 25°C
Standby current
µA
µV
1
BW = 200 Hz to 100 kHz, Co = 10 µF, IO = 1
Vn
Output noise voltage
150
TJ = 25°C
mA
PSRR
Ripple rejection
Current limit(2)
f = 1 kHz, Co = 10 µF
TJ = 25°C
60
dB
A
1.1
1.6
2.3
0.15
0.25
Output voltage line regulation
VO + 1 V < VI≤ 5.5 V
-0.15
0.02
0.05
%/V
%/A
(∆VO/VO)(3)
Output voltage load regulation
EN high level input(2)
EN low level input(2)
EN input current
0 µA < IO < 1 A
-0.25
1.3
VIH
VIL
II
V
-0.2
0.4
100
100
1.70
EN = 0 V or VI
0.01
nA
nA
V
I(FB)
Feedback current
UVLO threshold
TPS72501
V(FB) = 1.22
-100
1.45
VCC rising
1.57
50
UVLO hysteresis
UVLO deglitch
TJ = 25°C, VCC rising
TJ = 25°C, VCC rising
TJ = 25°C, VCC rising
mV
µs
µs
10
UVLO delay
100
(1) Minimum IN operating voltage used for testing is VO(typ) + 1 V.
(2) Test condition includes output voltage VO = VO - 15% and pulse duration = 10 ms.
(3) VImin = (VO + 1) or 1.8 V whichever is greater.
ǒ
IminǓ
V
5.5 V * V
O
ǒ
Ǔ
Line regulation (mV) + %ńV
1000
100
3
TPS72501
TPS72515, TPS72516
TPS72518, TPS72525
www.ti.com
SLVS341D–MAY 2002–REVISED MARCH 2004
ELECTRICAL CHARACTERISTICS (continued)
over recommended operating free-air temperature range VI = VO(typ) + 1 V, IO= 1 mA, EN = IN, Co = 1 µF, Ci = 1 µF (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
TJ = 25°C
MIN
TYP
MAX UNIT
IO = 1 A
IO = 1 A
IO = 1 A
IO = 1 A
170
(4)
(4)
TPS72525
TPS72518
280
mV
VDO
Dropout voltage
TJ = 25°C
210
320
Minimum input voltage for valid
RESET
1.3
90
V
Trip threshold voltage
Hysteresis voltage
93
10
50
10
96 %VO
mV
RESET
t(RESET) delay time
25
75
ms
µs
V
Rising edge deglitch
Output low voltage (at 700 µA)
Leakage current
-0.3
0.4
100
nA
(4) Dropout voltage is defined as the differential voltage between VO and VI when VO drops 100 mV below the value measured with
VI = VO + 1 V.
4
TPS72501
TPS72515, TPS72516
TPS72518, TPS72525
www.ti.com
SLVS341D–MAY 2002–REVISED MARCH 2004
FUNCTIONAL BLOCK DIAGRAM—ADJUSTABLE VERSION
TPS72501
IN
OUT
FB
EN
Current
Limit/Thermal
Protection
1.220
V
ref
GND
FUNCTIONAL BLOCK DIAGRAM—FIXED VERSION
TPS72515/16/18/25
IN
OUT
EN
Current
Limit/Thermal
Protection
1.220
V
ref
GND
RESET
Deglitch
and
Delay
0.93 × V
ref
TERMINAL FUNCTIONS
TERMINAL
NO.D
CQ &
KTT
I/O DESCRIPTION
NO.
D
NAME
ENABLE
FB
5
2
1
I
Enable input
Feedback
Ground
GND
3, 6, 7
8
3
2
5
IN
I
Input supply voltage
RESET/FB
—
O/I This terminal is the feedback point for the adjustable option TPS72501. For all other options, this
terminal is the RESET output terminal. When used with a pullup resistor, this open-drain output
provides the active low RESET signal when the regulator output voltage drops more than 5% below
its nominal output voltage. The RESET delay time is typically 50 ms.
NC
4
1
—
4
No connection
OUT
O
Regulated output voltage
5
TPS72501
TPS72515, TPS72516
TPS72518, TPS72525
www.ti.com
SLVS341D–MAY 2002–REVISED MARCH 2004
RESET TIMING DIAGRAM
IN
V
RES
V
RES
(see Note A)
t
OUT
V
IT+
(see Note B)
V
IT+
(see Note B)
Threshold
Voltage
V
IT–
V
IT–
(see Note B)
(see Note B)
t
RESET
Output
50 ms
Delay
50 ms
Delay
Output
Undefined
Output
Undefined
t
NOTES:A. V
is the minimum input voltage for a valid RESET. The symbol V
is not currently listed within EIA or JEDEC standards for
RES
RES
semiconductorsymbology.
–Trip voltage is typically 7% lower than the output voltage (93%V ) V to V is the hysteresis voltage.
B.
V
IT
O
IT–
IT+
6
TPS72501
TPS72515, TPS72516
TPS72518, TPS72525
www.ti.com
SLVS341D–MAY 2002–REVISED MARCH 2004
TYPICAL CHARACTERISTICS
TPS72518
OUTPUT VOLTAGE
vs
TPS72518
OUTPUT VOLTAGE
vs
TPS72518
GROUND CURRENT
vs
OUTPUT CURRENT
JUNCTION TEMPERATURE
JUNCTION TEMPERATURE
1.805
250
1.8015
1.801
V = 2.8 V
I
V = 2.8 V
I
V = 2.8 V
I
I
= 1 A
C
o
= 1 µF
O
C
o
= 1 µF
C
T
= 1 µF
= 25° C
o
T
J
= 25° C
200
150
J
1.800
1.795
I
= 0 mA
O
1.8005
1.8
I
= 0 mA
O
100
50
0
1.7995
I
= 1 A
O
1.790
1.785
1.799
1.7985
−40−25 −10
5 20 35 50 65 80 95 110 125
0
0.2
0.4
0.6
0.8
1
1000
4.5
−40 −25−10 5 20 35 50 65 80 95 110 125
T
J
− Junction Temperature − °C
I
− Output Current − A
T
J
− Junction Temperature − °C
O
Figure 1.
Figure 2.
Figure 3.
TPS72518
TPS72525
TPS72518
GROUND CURRENT
vs
OUTPUT CURRENT
DC DROPOUT VOLTAGE
vs
DROPOUT VOLTAGE
vs
OUTPUT CURRENT
JUNCTION TEMPERATURE
300
250
200
150
100
200
175
150
125
300
250
V
C
= 1.7 V
= 1 µF
O
V
= 2.5 V (nom)
O
o
T
J
= 125°C
I = 1 A
O
200
150
100
50
T
J
= 25°C
100
75
50
T
J
= −40°C
50
0
I
= 10 mA
O
25
0
0
−40 −25−10 5 20 35 50 65 80 95 110 125
0
0.2
0.4
0.6
0.8
1
0.01
0.1
1
10
100
I
− Output Current − A
T
J
− Junction Temperature − °C
O
I
− Output Current − mA
O
Figure 4.
Figure 5.
Figure 6.
MINIMUM REQUIRED
INPUT VOLTAGE
vs
TPS72518
TPS72518
LOAD TRANSIENT RESPONSE
OUTPUT VOLTAGE
LINE TRANSIENT RESPONSE
4.5
V
= 2.8 V
O
I
= 1 A
O
100
0
C
= 10 µF
3.8
2.8
o
C
o
= 10 µF
4
T
J
= 125°C
C = 1 µF
i
3.5
T
J
= 25°C
−100
3
1
0.5
0
100
0
2.5
T
J
= −40°C
2
−100
1.5
0
5
10 15 20 25 30 35 40 45 50
0
50 100 150 200 250 300 350 400 450 500
1.5
2
2.5
3
3.5
4
t − Time − µs
t − Time − µs
V
− Output Voltage − V
O
Figure 7.
Figure 8.
Figure 9.
7
TPS72501
TPS72515, TPS72516
TPS72518, TPS72525
www.ti.com
SLVS341D–MAY 2002–REVISED MARCH 2004
TYPICAL CHARACTERISTICS (continued)
TPS72518 OUTPUT VOLTAGE,
ENABLE VOLTAGE
vs
TIME (START-UP)
TPS72518
LOAD TRASIENT RESPONSE
TPS72518
POWER UP/POWER DOWN
3
2
1
R
C
= 1.8 Ω
= 1 µF
L
5
4
100
0
V = 2.8 V
I
o
I
= 1 A
O
C = 1 µF
i
C
o
= 10 µF
−100
3
2
0
V = 2.8 V
V
I
I
C
o
= 1 µF
C = 1 µF
I
2
1
1
0
1.5
0.5
0
1
V
O
0.5
0
0
5
10 15 20 25 30 35 40 45 50
0
100 200 300 400 500 600 700 800 900 1000
0
20 40 60 80 100 120 140 160 180 200
t − Time − µs
t − Time − µs
t − Time − µs
Figure 10.
Figure 11.
Figure 12.
TPS72518 OUTPUT SPECTRAL
TPS72518
RIPPLE REJECTION
vs
NOISE DENSITY
vs
OUTPUT IMPEDANCE
vs
FREQUENCY
FREQUENCY
FREQUENCY
3.5
3
10
100
90
V = 2.8 V,
I
V = 2.8 V
I
V
= 1.8 V,
I
= 1 A
O
O
I
= 1 mA
O
C
o
= 10 µF
80
C
O
= 10 µF
2.5
2
70
1
60
50
10 µF / 1mA
I
= 1 A
O
1.5
1
0.1
40
30
20
10 µF / 1 A
V = 2.8 V
I
0.01
0
0.5
0
C
= 10 µF
= 25° C
o
I
= 1 mA
O
10
0
T
J
10
100
1 k
10 k
100 k
10
100
1 k
10 k
100 k
1 M
10
100
1 k
10 k
100 k
1 M
f − Frequency − Hz
f − Frequency − Hz
f − Frequency − Hz
Figure 13.
Figure 14.
Figure 15.
CURRENT LIMIT
vs
INPUT VOLTAGE
TPS72515 GROUND CURRENT
DROPOUT VOLTAGE
vs
INPUT VOLTAGE
vs
INPUT VOLTAGE
600
500
400
300
200
100
0
300
250
200
150
100
50
2000
1900
1800
1700
1600
1500
1400
1300
1200
T
= 125°C
J
T
= 125°C
J
T
= 25°C
J
T
= 25°C
J
I = 1 A
I = 0 A
T
= −40°C
J
T
J
= −40°C
1100
1000
0
1.5
2
2.5
3
3.5
4
4.5
5
5.5
1.5
2
2.5
3
3.5
4
4.5
5
5.5
0
1
2
3
4
5
6
V − Input Voltage − V
I
V − Input voltage − V
I
V − Input Voltage − V
I
Figure 16.
Figure 17.
Figure 18.
8
TPS72501
TPS72515, TPS72516
TPS72518, TPS72525
www.ti.com
SLVS341D–MAY 2002–REVISED MARCH 2004
APPLICATION INFORMATION
The TPS725xx family of low-dropout (LDO) regulators has numerous features that make it applicable to a wide
range of applications. The family operates with very low input voltage (≥1.8 V) and low dropout voltage (typically
200 mV at full load), making it an efficient stand-alone power supply or post regulator for battery or switch mode
power supplies. Both the active low RESET and 1-A output current make the TPS725xx family ideal for powering
processor and FPGA supplies. The TPS725xx family also has low output noise (typically 150 µVRMS with 10-µF
output capacitor), making it ideal for use in telecom equipment.
External Capacitor Requirements
A 1-µF or larger ceramic input bypass capacitor, connected between IN and GND and located close to the
TPS725xx, is required for stability. To improve transient response, noise rejection, and ripple rejection, an
additional 10-µF or larger, low ESR capacitor is recommended. A higher-value, low ESR input capacitor may be
necessary if large, fast-rise-time load transients are anticipated and the device is located several inches from the
power source, especially if the minimum input voltage of 1.8 V is used.
Although an output capacitor is not required for stability, transient response and output noise are improved with a
10-µF output capacitor.
Programming the TPS72501 Adjustable LDO Regulator
The output voltage of the TPS72501 adjustable regulator is programmed using an external resistor divider as
shown in Figure 19. The output voltage is calculated using:
R1
R2
ǒ1 ) Ǔ
V
+ V
O
ref
(1)
Where:
VFB = VREF = 1.22 V typical (see the electrical characteristics for VREF range)
•
Resistors R1 and R2 should be chosen for approximately 10-µA divider current. Lower value resistors offer no
inherent advantage and waste more power. Higher values should be avoided as leakage currents at FB increase
the output voltage error. The recommended design procedure is to choose R2 = 120 kΩ to set the divider current
at 10 µA and then calculate R1 using:
V
O
R1 +
* 1 R2
ǒ Ǔ
V
ref
(2)
TPS72501
OUTPUT VOLTAGE
PROGRAMMING GUIDE
(Standard 1% Resistor Values)
V
I
IN
1 µF
≥ 1.3 V
≤ 0.4 V
PROGRAM
VOLTAGE
ACTUAL
R1 (KΩ) R2 (kΩ) VOLTAGE
EN
OUT
FB
V
o
O
1.8 V
2.5 V
3.3 V
3.6 V
56.2
127
196
205
118
121
115
105
1.801
2.500
3.299
3.602
R1
C
1.22 V
GND
R2
Figure 19. TPS72501 Adjustable LDO Regulator Programming
9
TPS72501
TPS72515, TPS72516
TPS72518, TPS72525
www.ti.com
SLVS341D–MAY 2002–REVISED MARCH 2004
APPLICATION INFORMATION (continued)
Regulator Protection
The TPS725xx pass element has a built-in back diode that safely conducts reverse current when the input
voltage drops below the output voltage (e.g., during power down). Current is conducted from the output to the
input and is not internally limited. If extended reverse voltage is anticipated, external limiting might be
appropriate.
The TPS725xx also features internal current limiting and thermal protection. During normal operation, the
TPS725xx limits output current to approximately 1.6 A. When current limiting engages, the output voltage scales
back linearly until the overcurrent condition ends. While current limiting is designed to prevent gross device
failure, care should be taken not to exceed the power dissipation ratings of the package. If the temperature of the
device exceeds 165°C, thermal-protection circuitry shuts it down. Once the device has cooled down to below
145°C, regulator operation resumes.
THERMAL INFORMATION
The amount of heat that an LDO linear regulator generates is directly proportional to the amount of power it
dissipates during operation. All integrated circuits have a maximum allowable junction temperature (TJmax)
above which normal operation is not assured. A system designer must design the operating environment so that
the operating junction temperature (TJ) does not exceed the maximum junction temperature (TJmax). The two
main environmental variables that a designer can use to improve thermal performance are air flow and external
heatsinks. The purpose of this information is to aid the designer in determining the proper operating environment
for a linear regulator that is operating at a specific power level.
In general, the maximum expected power (PD(max)) consumed by a linear regulator is computed as:
PDmax + ǒVI(avg)
Ǔ
* V
I
) V
x I
I(avg) (Q)
O(avg)
O(avg)
(3)
Where:
•
•
•
•
VI(avg) is the average input voltage.
VO(avg) is the average output voltage.
IO(avg) is the average output current.
I(Q) is the quiescent current.
For most TI LDO regulators, the quiescent current is insignificant compared to the average output current;
therefore, the term VI(avg) x I(Q) can be neglected. The operating junction temperature is computed by adding the
ambient temperature (TA) and the increase in temperature due to the regulator's power dissipation. The
temperature rise is computed by multiplying the maximum expected power dissipation by the sum of the thermal
resistances between the junction and the case (RθJC), the case to heatsink (RθCS), and the heatsink to ambient
(RθSA). Thermal resistances are measures of how effectively an object dissipates heat. Typically, the larger the
device, the more surface area available for power dissipation and the lower the object's thermal resistance.
Figure 20 illustrates these thermal resistances for (a) a SOT223 package mounted in a JEDEC low-K board, and
(b) a DDPAK package mounted on a JEDEC high-K board.
10
TPS72501
TPS72515, TPS72516
TPS72518, TPS72525
www.ti.com
SLVS341D–MAY 2002–REVISED MARCH 2004
THERMAL INFORMATION (continued)
T
T
A
J
R
θ
JC
A
CIRCUIT BOARD COPPER AREA
C
B
B
C
B
A
R
θ
θ
CS
C
R
SA
C
DDPAK Package
SOT223 Package
(a)
(b)
T
A
Figure 20. Thermal Resistances
Equation 4 summarizes the computation:
) P max x ǒR
θSAǓ
T
+ T
) R
) R
D
J
A
θJC
θCS
(4)
The RθJC is specific to each regulator as determined by its package, lead frame, and die size provided in the
regulator's data sheet. The RθSA is a function of the type and size of heatsink. For example, black body radiator
type heatsinks can have RθCS values ranging from 5°C/W for very large heatsinks to 50°C/W for very small
heatsinks. The RθCS is a function of how the package is attached to the heatsink. For example, if a thermal
compound is used to attach a heatsink to a SOT223 package, RθCSof 1°C/W is reasonable.
Even if no external black body radiator type heatsink is attached to the package, the board on which the
regulator is mounted provides some heatsinking through the pin solder connections. Some packages, like the
DDPAK and SOT223 packages, use a copper plane underneath the package or the circuit board's ground plane
for additional heatsinking to improve their thermal performance. Computer-aided thermal modeling can be used
to compute very accurate approximations of an integrated circuit's thermal performance in different operating
environments (e.g., different types of circuit boards, different types and sizes of heatsinks, different air flows,
etc.). Using these models, the three thermal resistances can be combined into one thermal resistance between
junction and ambient (RθJA). This RθJAis valid only for the specific operating environment used in the computer
model.
Equation 4 simplifies into Equation 5:
T
+ T ) P max x R
D
J
A
θJA
(5)
Rearranging Equation 5 gives Equation 6:
T –T
J
A
R
+
θJA
P max
D
(6)
Using Equation 5 and the computer model generated curves shown in Figure 21 and Figure 24, a designer can
quickly compute the required heatsink thermal resistance/board area for a given ambient temperature, power
dissipation, and operating environment.
DDPAK Power Dissipation
The DDPAK package provides an effective means of managing power dissipation in surface mount applications.
The DDPAK package dimensions are provided in the Mechanical Data section at the end of the data sheet. The
addition of a copper plane directly underneath the DDPAK package enhances the thermal performance of the
package.
11
TPS72501
TPS72515, TPS72516
TPS72518, TPS72525
www.ti.com
SLVS341D–MAY 2002–REVISED MARCH 2004
THERMAL INFORMATION (continued)
To illustrate, the TPS72525 in a DDPAK package was chosen. For this example, the average input voltage is 5
V, the output voltage is 2.5 V, the average output current is 1 A, the ambient temperature 55°C, the air flow is
150 LFM, and the operating environment is the same as documented below. Neglecting the quiescent current,
the maximum average power is:
(
)
P max
5
2.5 V x 1 A
2.5 W
D
(7)
Substituting TJmax for TJ into Equation 6 gives Equation 8:
max + (125 * 55)°Cń2.5 W + 28°CńW
R
θJA
(8)
From Figure 21, DDPAK Thermal Resistance vs Copper Heatsink Area, the ground plane needs to be 1 cm2 for
the part to dissipate 2.5 W. The operating environment used in the computer model to construct Figure 21
consisted of a standard JEDEC High-K board (2S2P) with a 1 oz. internal copper plane and ground plane. The
package is soldered to a 2 oz. copper pad. The pad is tied through thermal vias to the 1 oz. ground plane.
Figure 22 shows the side view of the operating environment used in the computer model.
40
No Air Flow
35
150 LFM
30
250 LFM
25
20
15
0.1
1
10
100
2
Copper Heatsink Area − cm
Figure 21. DDPAK Thermal Resistance vs Copper Heatsink Area
2 oz. Copper Solder Pad
with 25 Thermal Vias
1 oz. Copper
Power Plane
1 oz. Copper
Ground Plane
Thermal Vias, 0.3 mm
Diameter, 1,5 mm Pitch
Figure 22. DDPAK Thermal Resistance
12
TPS72501
TPS72515, TPS72516
TPS72518, TPS72525
www.ti.com
SLVS341D–MAY 2002–REVISED MARCH 2004
THERMAL INFORMATION (continued)
From the data in Figure 23 and rearranging Equation 6, the maximum power dissipation for a different ground
plane area and a specific ambient temperature can be computed.
5
T
A
= 55°C
250 LFM
4
3
150 LFM
No Air Flow
2
1
0.1
1
10
100
2
Copper Heatsink Area − cm
Figure 23. Maximum Power Dissipation vs Copper Heatsink Area
SOT223 Power Dissipation
The SOT223 package provides an effective means of managing power dissipation in surface mount applications.
The SOT223 package dimensions are provided in the Mechanical Data section at the end of the data sheet. The
addition of a copper plane directly underneath the SOT223 package enhances the thermal performance of the
package.
To illustrate, the TPS72525 in a SOT223 package was chosen. For this example, the average input voltage is
3.3 V, the output voltage is 2.5 V, the average output current is 1 A, the ambient temperature 55°C, no air flow is
present, and the operating environment is the same as documented below. Neglecting the quiescent current, the
maximum average power is:
(
)
P max
3.3
2.5 V x 1 A
800 mW
D
(9)
Substituting TJmax for TJ into Equation 6 gives Equation 10:
max + (125 * 55)°Cń800 mW + 87.5°CńW
R
θJA
(10)
From Figure 24, RΘJA vs PCB Copper Area, the ground plane needs to be 0.55 in2 for the part to dissipate 800
mW. The operating environment used to construct Figure 24 consisted of a board with 1 oz. copper planes. The
package is soldered to a 1 oz. copper pad on the top of the board. The pad is tied through thermal vias to the 1
oz. ground plane.
13
TPS72501
TPS72515, TPS72516
TPS72518, TPS72525
www.ti.com
SLVS341D–MAY 2002–REVISED MARCH 2004
THERMAL INFORMATION (continued)
180
160
No Air Flow
140
120
100
80
60
40
20
0
0.1
1
10
2
PCB Copper Area − in
Figure 24. SOT223 Thermal Resistance vs PCB AREA
From the data in Figure 24 and rearranging Equation 6, the maximum power dissipation for a different ground
plane area and a specific ambient temperature can be computed (as shown in Figure 25).
6
T
A
= 25°C
5
4
2
4 in PCB Area
3
2
2
0.5 in PCB Area
1
0
0
25
50
75
100
125
150
T
A
− Ambient Temperature − °C
Figure 25. SOT223 Power Dissipation
14
PACKAGE OPTION ADDENDUM
www.ti.com
16-Mar-2007
PACKAGING INFORMATION
Orderable Device
TPS72501DCQ
Status (1)
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
Package Package
Pins Package Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)
Qty
Type
Drawing
SOT-223
DCQ
6
6
6
6
8
8
8
8
5
5
5
5
5
6
6
6
6
5
5
5
5
5
6
6
6
78 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
TPS72501DCQG4
TPS72501DCQR
TPS72501DCQRG4
TPS72501DR
SOT-223
SOT-223
SOT-223
SOIC
DCQ
DCQ
DCQ
D
78 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
2500 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
2500 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
2500 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
TPS72501DRG4
TPS72501DT
SOIC
D
2500 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
SOIC
D
250 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
TPS72501DTG4
TPS72501KTT
SOIC
D
250 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
OBSOLETE DDPAK/
TO-263
KTT
KTT
KTT
KTT
KTT
DCQ
DCQ
DCQ
DCQ
KTT
KTT
KTT
KTT
KTT
DCQ
DCQ
DCQ
TBD
Call TI
CU SN
CU SN
CU SN
CU SN
Call TI
TPS72501KTTR
TPS72501KTTRG3
TPS72501KTTT
TPS72501KTTTG3
TPS72515DCQ
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
DDPAK/
TO-263
500 Green (RoHS &
no Sb/Br)
Level-2-260C-1 YEAR
Level-2-260C-1 YEAR
Level-2-260C-1 YEAR
Level-2-260C-1 YEAR
DDPAK/
TO-263
500 Green (RoHS &
no Sb/Br)
DDPAK/
TO-263
50 Green (RoHS &
no Sb/Br)
DDPAK/
TO-263
50 Green (RoHS &
no Sb/Br)
SOT-223
SOT-223
SOT-223
SOT-223
78 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
TPS72515DCQG4
TPS72515DCQR
TPS72515DCQRG4
TPS72515KTT
78 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
2500 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
2500 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
OBSOLETE DDPAK/
TO-263
TBD
Call TI
CU SN
CU SN
CU SN
CU SN
Call TI
TPS72515KTTR
TPS72515KTTRG3
TPS72515KTTT
TPS72515KTTTG3
TPS72516DCQ
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
DDPAK/
TO-263
500 Green (RoHS &
no Sb/Br)
Level-2-260C-1 YEAR
Level-2-260C-1 YEAR
Level-2-260C-1 YEAR
Level-2-260C-1 YEAR
DDPAK/
TO-263
500 Green (RoHS &
no Sb/Br)
DDPAK/
TO-263
50 Green (RoHS &
no Sb/Br)
DDPAK/
TO-263
50 Green (RoHS &
no Sb/Br)
SOT-223
SOT-223
SOT-223
78 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
TPS72516DCQG4
TPS72516DCQR
78 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
2500 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
Addendum-Page 1
PACKAGE OPTION ADDENDUM
www.ti.com
16-Mar-2007
Orderable Device
TPS72516DCQRG4
TPS72516KTT
Status (1)
Package Package
Pins Package Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)
Qty
Type
Drawing
ACTIVE
SOT-223
DCQ
6
5
5
5
5
5
6
6
6
6
5
5
5
5
5
6
6
6
6
5
5
5
5
5
2500 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
OBSOLETE DDPAK/
TO-263
KTT
KTT
KTT
KTT
KTT
DCQ
DCQ
DCQ
DCQ
KTT
KTT
KTT
KTT
KTT
DCQ
DCQ
DCQ
DCQ
KTT
KTT
KTT
KTT
KTT
TBD
Call TI
CU SN
CU SN
CU SN
CU SN
Call TI
TPS72516KTTR
TPS72516KTTRG3
TPS72516KTTT
TPS72516KTTTG3
TPS72518DCQ
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
DDPAK/
TO-263
500 Green (RoHS &
no Sb/Br)
Level-2-260C-1 YEAR
Level-2-260C-1 YEAR
Level-2-260C-1 YEAR
Level-2-260C-1 YEAR
DDPAK/
TO-263
500 Green (RoHS &
no Sb/Br)
DDPAK/
TO-263
50 Green (RoHS &
no Sb/Br)
DDPAK/
TO-263
50 Green (RoHS &
no Sb/Br)
SOT-223
SOT-223
SOT-223
SOT-223
78 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
TPS72518DCQG4
TPS72518DCQR
TPS72518DCQRG4
TPS72518KTT
78 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
2500 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
2500 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
OBSOLETE DDPAK/
TO-263
TBD
Call TI
CU SN
CU SN
CU SN
CU SN
Call TI
TPS72518KTTR
TPS72518KTTRG3
TPS72518KTTT
TPS72518KTTTG3
TPS72525DCQ
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
DDPAK/
TO-263
500 Green (RoHS &
no Sb/Br)
Level-2-260C-1 YEAR
Level-2-260C-1 YEAR
Level-2-260C-1 YEAR
Level-2-260C-1 YEAR
DDPAK/
TO-263
500 Green (RoHS &
no Sb/Br)
DDPAK/
TO-263
50 Green (RoHS &
no Sb/Br)
DDPAK/
TO-263
50 Green (RoHS &
no Sb/Br)
SOT-223
SOT-223
SOT-223
SOT-223
78 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
TPS72525DCQG4
TPS72525DCQR
TPS72525DCQRG4
TPS72525KTT
78 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
2500 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
2500 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
OBSOLETE DDPAK/
TO-263
TBD
Call TI
CU SN
CU SN
CU SN
CU SN
Call TI
TPS72525KTTR
TPS72525KTTRG3
TPS72525KTTT
TPS72525KTTTG3
ACTIVE
ACTIVE
ACTIVE
ACTIVE
DDPAK/
TO-263
500 Green (RoHS &
no Sb/Br)
Level-2-260C-1 YEAR
Level-2-260C-1 YEAR
Level-2-260C-1 YEAR
Level-2-260C-1 YEAR
DDPAK/
TO-263
500 Green (RoHS &
no Sb/Br)
DDPAK/
TO-263
50 Green (RoHS &
no Sb/Br)
DDPAK/
TO-263
50 Green (RoHS &
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.
Addendum-Page 2
PACKAGE OPTION ADDENDUM
www.ti.com
16-Mar-2007
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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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 3
IMPORTANT NOTICE
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