SM72238TDX-3.0 [NSC]
SolarMagic Micropower Voltage Regulator; 的SolarMagic微功率稳压器
| 型号： | SM72238TDX-3.0 |
| 厂家： | 
National Semiconductor |
| 描述： | SolarMagic Micropower Voltage Regulator |
| 文件： | 总12页 (文件大小：393K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
May 9, 2011
SM72238
SolarMagic Micropower Voltage Regulator
General Description
Features
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.
Renewable Energy Grade
■
■
■
■
■
■
■
■
High accuracy output voltage
Guaranteed 100mA output current
Extremely low quiescent current
Low dropout voltage
Extremely tight load and line regulation
The SM72238 is available in the surface-mount D-Pak pack-
age.
Very low temperature coefficient
Careful design of the SM72238 has minimized all contribu-
tions 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.
Use as Regulator or Reference
Needs minimum capacitance for stability
■
■
Current and Thermal Limiting
Stable with low-ESR output capacitors (10mΩ to 6Ω)
■
Block Diagram and Typical Applications
SM72238
30141325
© 2011 National Semiconductor Corporation
301413
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Connection Diagrams
TO-252 (D-Pak)
30141370
Front View
Ordering Information
Temperature
VOUT
Package
Part Number
Package Marking
Transport Media
NSC Drawing
Range
SM72238TD-3.0
SM72238TDE-3.0
SM72238TDX-3.0
SM72238TD-3.3
SM72238TDE-3.3
SM72238TDX-3.3
SM72238TD-5.0
SM72238TDE-5.0
SM72238TDX-5.0
75 Units in Rail
TO-252
(DPAK)
-40<TJ<125
3.0
S72238–3.0
S72238–3.3
S72238
250 Units in Tape and Reel
2500 Units in Tape and Reel
75 Units in Rail
TD03B
TO-252
(DPAK)
-40<TJ<125
-40<TJ<125
3.3
5.0
250 Units in Tape and Reel
2500 Units in Tape and Reel
75 Units in Rail
TD03B
TD03B
TO-252
(DPAK)
250 Units in Tape and Reel
2500 Units in Tape and Reel
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2
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Operating Ratings (Note 1)
Maximum Input Supply Voltage
30V
Junction Temperature Range
(TJ) (Note 6)
−40° to +125°C
Input Supply Voltage
Power Dissipation
Junction Temperature (TJ)
Ambient Storage Temperature
−0.3 to +30V
Internally Limited
+150°C
−65° to +150°C
Soldering Dwell Time, Temperature
Wave
Infrared
Vapor Phase
4 seconds, 260°C
10 seconds, 240°C
75 seconds, 219°C
ESD Rating
Human Body Model(Note 11)
2500V
Electrical Characteristics (Note 2)
Parameter
Conditions (Note 2)
Typ
3.0
Tested Limit (Note 3)
Design Limit (Note 4) Units
V max
3V Versions
Output Voltage
TJ = 25°C
3.030
2.970
V min
3.045
V max
3.0
3.0
3.0
−25°C ≤ TJ ≤ 85°C
2.955
3.060
2.940
3.072
V min
V max
V min
V max
Full Operating
Temperature Range
Output Voltage
100μA ≤ IL ≤ 100mA
TJ ≤ TJMAX
2.928
V min
3.3V Versions
Output Voltage
TJ = 25°C
3.333
3.267
V max
V min
V max
3.3
3.3
3.3
3.3
3.350
−25°C ≤ TJ ≤ 85°C
3.251
3.366
3.234
3.379
V min
V max
V min
V max
Full Operating
Temperature Range
Output Voltage
100μA ≤ IL ≤ 100mA
TJ ≤ TJMAX
3.221
V min
5.0V Versions
Output Voltage
TJ = 25°C
5.05
4.95
V max
V min
V max
5.0
5.0
5.0
5.0
5.075
−25°C ≤ TJ ≤ 85°C
4.925
5.1
V min
V max
V min
V max
Full Operating
Temperature Range
4.9
Output Voltage
5.12
100μA ≤ IL ≤ 100mA
TJ ≤ TJMAX
4.88
150
V min
All Voltage Options
Output Voltage
(Note 7)
50
ppm/°C
Temperature Coefficient
Line Regulation
(Note 9)
0.04
0.2
0.2
% max
% max
(VONOM + 1)V ≤ Vin ≤ 30V (Note
10)
0.4
0.3
Load Regulation
(Note 9)
0.1
% max
% max
100μA ≤ IL ≤ 100mA
3
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Parameter
Conditions (Note 2)
IL = 100μA
Typ
50
Tested Limit (Note 3)
Design Limit (Note 4) Units
mV max
Dropout Voltage
(Note 5)
80
150
mV max
mV max
mV max
IL = 100mA
IL = 100μA
IL = 100mA
450
120
380
75
600
Ground
Current
μA max
μA max
mA max
mA max
μA max
μA max
mA max
mA max
140
14
8
12
Dropout
Vin = (VONOM − 0.5)V
IL = 100μA
110
170
Ground Current
200
Current Limit
Vout = 0
160
200
0.2
220
Thermal Regulation
(Note 8)
0.05
%/W
max
Output Noise,
430
160
CL = 1μF (5V Only)
CL = 200μF
μV rms
μV rms
10 Hz to 100 kHz
CL = 3.3μF
100
(Bypass = 0.01μF)
μV rms
Note 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 guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions, see the
Electrical Characteristics tables.
Note 2: Unless otherwise specified all limits guaranteed 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.
Note 3: Guaranteed and 100% production tested.
Note 4: Guaranteed but not 100% production tested. These limits are not used to calculate outgoing AQL levels.
Note 5: 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.
Note 6: Junction-to-case thermal resistance for the TO-252 package is 5.4°C/W.
Note 7: Output or reference voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range.
Note 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.
Note 9: 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.
Note 10: For IL = 100μA and TJ = 125°C, line regulation is guaranteed by design to 0.2%. See Typical Performance Characteristics for line regulation versus
temperature and load current.
Note 11: Human Body Model 1.5kΩ in series with 100pF.
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4
Typical Performance Characteristics
Quiescent Current
Dropout Characteristics
30141328
30141327
Input Current
Input Current
30141329
30141330
Output Voltage vs. Temperature of 3
Representative Units
Quiescent Current
30141332
30141331
5
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Quiescent Current
Quiescent Current
Dropout Voltage
Quiescent Current
Short Circuit Current
Line Transient Response
30141333
30141335
30141337
30141334
30141336
30141344
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6
Load Transient Response
Output Impedance
Ripple Rejection
Load Transient Response
30141345
30141348
30141350
30141346
30141349
30141351
Ripple Rejection
Ripple Rejection
7
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Shutdown Threshold Voltage
Maximum Rated Output Current
Output Capacitor ESR Range
Line Regulation
30141354
30141355
Thermal Response
30141357
30141358
30141363
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8
capacitor can be used if a series resistance is added (recom-
mended value of resistance about 0.1Ω to 2Ω).
Application Hints
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.
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 elec-
trolytes that freeze at about −30°C, so solid tantalums are
recommended for operation below −25°C. The important pa-
rameters of the capacitor are an ESR of about 5Ω or less and
a resonant frequency above 500kHz. The value of this ca-
pacitor may be increased without limit.
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.
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 curve Output Capacitor ESR Range).
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.
The reason for the lower ESR limit is that the loop compen-
sation 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
Typical Applications
5 Volt Current Limiter
30141310
*Minimum input-output voltage ranges from 40mV to 400mV, depending on load current. Current limit is typically 160mA.
9
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Schematic Diagram
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10
Physical Dimensions inches (millimeters) unless otherwise noted
D-Pak Package
NS Package Number TD03B
11
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Notes
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