SM72238TDX-5.0 [TI]
SM72238TD-50;
| 型号： | SM72238TDX-5.0 |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | SM72238TD-50 |
| 文件： | 总17页 (文件大小：1096K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SM72238
www.ti.com
SNVS694C –JANUARY 2011–REVISED APRIL 2013
Micropower Voltage Regulator
Check for Samples: SM72238
1
FEATURES
DESCRIPTION
The SM72238 is a micropower voltage regulator with
very low quiescent current (75µA typ.) and very low
dropout voltage (typ. 40mV at light loads and 380mV
at 100mA). It is ideally suited for use in battery-
powered systems. Furthermore, the quiescent current
of the SM72238 increases only slightly in dropout,
prolonging battery life.
2
•
•
•
•
•
•
•
•
•
•
•
Renewable Energy Grade
High-Accuracy Output Voltage
Ensured 100mA Output Current
Extremely Low Quiescent Current
Low Dropout Voltage
Extremely Tight Load and Line Regulation
Very Low Temperature Coefficient
Use as Regulator or Reference
Needs Minimum Capacitance for Stability
Current and Thermal Limiting
The SM72238 is available in the surface-mount D-
Pak package.
Careful design of the SM72238 has minimized all
contributions to the error budget. This includes a tight
initial tolerance (.5% typ.), extremely good load and
line regulation (.05% typ.) and a very low output
voltage temperature coefficient, making the part
useful as a low-power voltage reference.
Stable With Low-ESR Output Capacitors
(10mΩ to 6Ω)
Block Diagram and Typical Applications
Figure 1. SM72238
1
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.
All trademarks are the property of their respective owners.
2
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 © 2011–2013, Texas Instruments Incorporated
SM72238
SNVS694C –JANUARY 2011–REVISED APRIL 2013
www.ti.com
Connection Diagrams
Front View
Figure 2. PFM Package
See Package Number NDP0003B
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.
Absolute Maximum Ratings(1)(2)
Input Supply Voltage
−0.3 to +30V
Internally Limited
+150°C
Power Dissipation
Junction Temperature (TJ)
Ambient Storage Temperature
Soldering Dwell Time, Temperature
−65° to +150°C
4 seconds, 260°C
10 seconds, 240°C
75 seconds, 219°C
2500V
Wave
Infrared
Vapor Phase
Human Body Model(3)
ESD Rating
(1) Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which
operation of the device is ensured. Operating Ratings do not imply ensured performance limits. For ensured performance limits and
associated test conditions, see the Electrical Characteristics tables.
(2) If Military/Aerospace specified devices are required, please contact the TI Sales Office/ Distributors for availability and specifications.
(3) Human Body Model 1.5kΩ in series with 100pF.
Operating Ratings(1)
Maximum Input Supply Voltage
Junction Temperature Range, (TJ)(2)
30V
−40° to +125°C
(1) Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which
operation of the device is ensured. Operating Ratings do not imply ensured performance limits. For ensured performance limits and
associated test conditions, see the Electrical Characteristics tables.
(2) Junction-to-case thermal resistance for the PFM package is 5.4°C/W.
2
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SNVS694C –JANUARY 2011–REVISED APRIL 2013
Electrical Characteristics(1)
Parameter
3V Versions
Output Voltage
Conditions(1)
Typ
3.0
3.0
3.0
3.0
Tested Limit(2)
Design Limit(3)
Units
TJ = 25°C
3.030
2.970
V max
V min
V max
V min
V max
V min
V max
V min
−25°C ≤ TJ ≤ 85°C
3.045
2.955
3.060
2.940
3.072
2.928
Full Operating Temperature Range
Output Voltage
100µA ≤ IL ≤ 100mA,
TJ ≤ TJMAX
3.3V Versions
Output Voltage
TJ = 25°C
3.3
3.3
3.3
3.3
3.333
3.267
V max
V min
V max
V min
V max
V min
V max
V min
−25°C ≤ TJ ≤ 85°C
3.350
3.251
3.366
3.234
3.379
3.221
Full Operating Temperature Range
Output Voltage
100µA ≤ IL ≤ 100mA
TJ ≤ TJMAX
5.0V Versions
Output Voltage
TJ = 25°C
5.0
5.0
5.0
5.0
5.05
4.95
V max
V min
V max
V min
V max
V min
V max
V min
−25°C ≤ TJ ≤ 85°C
5.075
4.925
5.1
Full Operating Temperature Range
4.9
Output Voltage
100µA ≤ IL ≤ 100mA
TJ ≤ TJMAX
5.12
4.88
All Voltage Options
Output Voltage
See(4)
50
150
ppm/°C
Temperature Coefficient
Line Regulation(5)
Load Regulation(5)
Dropout Voltage(7)
(VONOM + 1)V ≤ Vin ≤ 30V(6)
0.04
0.2
0.2
80
% max
% max
0.4
0.3
100µA ≤ IL ≤ 100mA
IL = 100µA
0.1
% max
% max
mV max
mV max
mV max
mV max
50
150
600
IL = 100mA
450
380
(1) Unless otherwise specified all limits ensured for VIN = (VONOM + 1)V, IL = 100µA and CL = 1µF. Limits appearing in boldface type apply
over the entire junction temperature range for operation. Limits appearing in normal type apply for TA = TJ = 25°C.
(2) Ensured and 100% production tested.
(3) Ensured but not 100% production tested. These limits are not used to calculate outgoing AQL levels.
(4) Output or reference voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range.
(5) Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to
heating effects are covered under the specification for thermal regulation.
(6) For IL = 100µA and TJ = 125°C, line regulation is ensured by design to 0.2%. See Typical Performance Characteristics for line regulation
versus temperature and load current.
(7) Dropout Voltage is defined as the input to output differential at which the output voltage drops 100 mV below its nominal value
measured at 1V differential. At very low values of programmed output voltage, the minimum input supply voltage of 2V (2.3V over
temperature) must be taken into account.
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Electrical Characteristics(1) (continued)
Parameter
Conditions(1)
Typ
Tested Limit(2)
Design Limit(3)
Units
Ground Current
IL = 100µA
75
120
µA max
µA max
mA max
mA max
µA max
µA max
mA max
mA max
140
14
IL = 100mA
8
12
Dropout Ground Current Vin = (VONOM − 0.5)V,
110
160
0.05
170
200
0.2
IL = 100µA
200
220
Current Limit
Vout = 0
See(8)
Thermal Regulation
%/W
max
Output Noise,
10 Hz to 100 kHz
CL = 1µF (5V Only)
CL = 200µF
430
160
100
µV rms
µV rms
µV rms
CL = 3.3µF
(Bypass = 0.01µF)
(8) Thermal regulation is defined as the change in output voltage at a time T after a change in power dissipation is applied, excluding load
or line regulation effects. Specifications are for a 50mA load pulse at VIN = 30V (1.25W pulse) for T = 10ms.
4
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SNVS694C –JANUARY 2011–REVISED APRIL 2013
Typical Performance Characteristics
Quiescent Current
Dropout Characteristics
Figure 3.
Figure 4.
Input Current
Input Current
Figure 5.
Figure 6.
Output Voltage
vs.
Temperature of 3
Representative Units
Quiescent Current
Figure 7.
Figure 8.
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Typical Performance Characteristics (continued)
Quiescent Current
Quiescent Current
Figure 9.
Figure 10.
Quiescent Current
Short Circuit Current
Figure 11.
Figure 12.
Dropout Voltage
Line Transient Response
Figure 13.
Figure 14.
6
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SNVS694C –JANUARY 2011–REVISED APRIL 2013
Typical Performance Characteristics (continued)
Load Transient Response
Load Transient Response
Figure 15.
Figure 16.
Output Impedance
Ripple Rejection
Figure 17.
Figure 18.
Ripple Rejection
Ripple Rejection
Figure 19.
Figure 20.
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Typical Performance Characteristics (continued)
Shutdown Threshold Voltage
Line Regulation
Figure 21.
Figure 22.
Maximum Rated Output Current
Thermal Response
Figure 23.
Figure 24.
Output Capacitor ESR Range
Figure 25.
8
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SM72238
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SNVS694C –JANUARY 2011–REVISED APRIL 2013
APPLICATION HINTS
EXTERNAL CAPACITORS
A 1.0µF (or greater) capacitor is required between the output and ground for stability. Without this capacitor the
part will oscillate. Most types of tantalum or aluminum electrolytics work fine here; even film types work but are
not recommended for reasons of cost. Many aluminum electrolytics have electrolytes that freeze at about −30°C,
so solid tantalums are recommended for operation below −25°C. The important parameters of the capacitor are
an ESR of about 5Ω or less and a resonant frequency above 500kHz. The value of this capacitor may be
increased without limit.
Ceramic capacitors whose value is greater than 1000pF should not be connected directly from the SM72238
output to ground. Ceramic capacitors typically have ESR values in the range of 5 to 10mΩ, a value below the
lower limit for stable operation (see Figure 25).
The reason for the lower ESR limit is that the loop compensation of the part relies on the ESR of the output
capacitor to provide the zero that gives added phase lead. The ESR of ceramic capacitors is so low that this
phase lead does not occur, significantly reducing phase margin. A ceramic output capacitor can be used if a
series resistance is added (recommended value of resistance about 0.1Ω to 2Ω).
At lower values of output current, less output capacitance is required for stability. The capacitor can be reduced
to 0.33µF for currents below 10mA or 0.1µF for currents below 1mA.
Unlike many other regulators, the SM72238 will remain stable and in regulation with no load in addition to the
internal voltage divider. This is especially important in CMOS RAM keep-alive applications.
A 1µF tantalum, ceramic or aluminum electrolytic capacitor should be placed from the SM72238 input to ground
if there is more than 10 inches of wire between the input and the AC filter capacitor or if a battery is used as the
input.
REDUCING OUTPUT NOISE
In reference applications it may be advantageous to reduce the AC noise present at the output. One method is to
reduce the regulator bandwidth by increasing the size of the output capacitor. This is the only way noise can be
reduced but is relatively inefficient, as increasing the capacitor from 1µF to 220µF only decreases the noise from
430µV to 160µV rms for a 100kHz bandwidth at 5V output.
Typical Applications
SM72238
*Minimum input-output voltage ranges from 40mV to 400mV, depending on load current. Current limit is typically
160mA.
Figure 26. 5 Volt Current Limiter
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SNVS694C –JANUARY 2011–REVISED APRIL 2013
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Schematic Diagram
10
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SNVS694C –JANUARY 2011–REVISED APRIL 2013
REVISION HISTORY
Changes from Revision B (April 2013) to Revision C
Page
•
Changed layout of National Data Sheet to TI format .......................................................................................................... 10
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PACKAGE OPTION ADDENDUM
www.ti.com
21-May-2013
PACKAGING INFORMATION
Orderable Device
Status Package Type Package Pins Package
Eco Plan Lead/Ball Finish
MSL Peak Temp
Op Temp (°C)
-40 to 125
-40 to 125
-40 to 125
-40 to 125
-40 to 125
-40 to 125
-40 to 125
-40 to 125
-40 to 125
Device Marking
Samples
Drawing
Qty
(1)
(2)
(3)
(4/5)
SM72238TD-3.0/NOPB
SM72238TD-3.3/NOPB
SM72238TD-5.0/NOPB
SM72238TDE-3.0/NOPB
SM72238TDE-3.3/NOPB
SM72238TDE-5.0/NOPB
SM72238TDX-3.0/NOPB
SM72238TDX-3.3/NOPB
SM72238TDX-5.0/NOPB
ACTIVE
TO-252
TO-252
TO-252
TO-252
TO-252
TO-252
TO-252
TO-252
TO-252
NDP
3
3
3
3
3
3
3
3
3
75
Green (RoHS
& no Sb/Br)
CU SN
CU SN
CU SN
CU SN
CU SN
CU SN
CU SN
CU SN
CU SN
Level-2-260C-1 YEAR
Level-2-260C-1 YEAR
Level-2-260C-1 YEAR
Level-2-260C-1 YEAR
Level-2-260C-1 YEAR
Level-2-260C-1 YEAR
Level-2-260C-1 YEAR
Level-2-260C-1 YEAR
Level-2-260C-1 YEAR
S72238
-3.0
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
NDP
NDP
NDP
NDP
NDP
NDP
NDP
NDP
75
75
Green (RoHS
& no Sb/Br)
S72238
-3.3
Green (RoHS
& no Sb/Br)
S72238
250
250
250
2500
2500
2500
Green (RoHS
& no Sb/Br)
S72238
-3.0
Green (RoHS
& no Sb/Br)
S72238
-3.3
Green (RoHS
& no Sb/Br)
S72238
Green (RoHS
& no Sb/Br)
S72238
-3.0
Green (RoHS
& no Sb/Br)
S72238
-3.3
Green (RoHS
& no Sb/Br)
S72238
(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)
Addendum-Page 1
PACKAGE OPTION ADDENDUM
www.ti.com
21-May-2013
(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
(5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation
of the previous line and the two combined represent the entire Device Marking for that device.
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 2
PACKAGE MATERIALS INFORMATION
www.ti.com
29-May-2013
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device
Package Package Pins
Type Drawing
SPQ
Reel
Reel
A0
B0
K0
P1
W
Pin1
Diameter Width (mm) (mm) (mm) (mm) (mm) Quadrant
(mm) W1 (mm)
SM72238TDE-3.0/NOPB TO-252
SM72238TDE-3.3/NOPB TO-252
SM72238TDE-5.0/NOPB TO-252
SM72238TDX-3.0/NOPB TO-252
SM72238TDX-3.3/NOPB TO-252
SM72238TDX-5.0/NOPB TO-252
NDP
NDP
NDP
NDP
NDP
NDP
3
3
3
3
3
3
250
250
178.0
178.0
178.0
330.0
330.0
330.0
16.4
16.4
16.4
16.4
16.4
16.4
6.9
6.9
6.9
6.9
6.9
6.9
10.5
10.5
10.5
10.5
10.5
10.5
2.7
2.7
2.7
2.7
2.7
2.7
8.0
8.0
8.0
8.0
8.0
8.0
16.0
16.0
16.0
16.0
16.0
16.0
Q2
Q2
Q2
Q2
Q2
Q2
250
2500
2500
2500
Pack Materials-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
29-May-2013
*All dimensions are nominal
Device
Package Type Package Drawing Pins
SPQ
Length (mm) Width (mm) Height (mm)
SM72238TDE-3.0/NOPB
SM72238TDE-3.3/NOPB
SM72238TDE-5.0/NOPB
SM72238TDX-3.0/NOPB
SM72238TDX-3.3/NOPB
SM72238TDX-5.0/NOPB
TO-252
TO-252
TO-252
TO-252
TO-252
TO-252
NDP
NDP
NDP
NDP
NDP
NDP
3
3
3
3
3
3
250
250
213.0
213.0
213.0
367.0
367.0
367.0
191.0
191.0
191.0
367.0
367.0
367.0
55.0
55.0
55.0
38.0
38.0
38.0
250
2500
2500
2500
Pack Materials-Page 2
MECHANICAL DATA
NDP0003B
TD03B (Rev F)
www.ti.com
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