LM317LZ/LFT4 [TI]
100mA、40V、高 PSRR、可调节线性稳压器 | LP | 3;
| 型号： | LM317LZ/LFT4 |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | 100mA、40V、高 PSRR、可调节线性稳压器 | LP | 3 电源电路 线性稳压器IC |
| 文件： | 总22页 (文件大小：435K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LM317L
LM317L 3-Terminal Adjustable Regulator
Literature Number: SNVS775I
September 14, 2010
LM317L
3-Terminal Adjustable Regulator
fixed resistor between the adjustment and output, the LM317L
can be used as a precision current regulator. Supplies with
electronic shutdown can be achieved by clamping the adjust-
ment terminal to ground which programs the output to 1.2V
where most loads draw little current.
General Description
The LM317L is an adjustable 3-terminal positive voltage reg-
ulator capable of supplying 100mA over a 1.2V to 37V output
range. It is exceptionally easy to use and requires only two
external resistors to set the output voltage. Further, both line
and load regulation are better than standard fixed regulators.
Also, the LM317L is available packaged in a standard TO-92
transistor package which is easy to use.
The LM317L is available in a standard TO-92 transistor pack-
age, the SO-8 package, and 6-Bump micro SMD package.
The LM317L is rated for operation over a −40°C to 125°C
range.
In addition to higher performance than fixed regulators, the
LM317L offers full overload protection. Included on the chip
are current limit, thermal overload protection and safe area
protection. All overload protection circuitry remains fully func-
tional even if the adjustment terminal is disconnected.
Features
Adjustable output down to 1.2V
■
■
■
■
■
■
■
■
Guaranteed 100mA output current
Line regulation typically 0.01%V
Normally, no capacitors are needed unless the device is sit-
uated more than 6 inches from the input filter capacitors in
which case an input bypass is needed. An optional output ca-
pacitor can be added to improve transient response. The
adjustment terminal can be bypassed to achieve very high
ripple rejection ratios which are difficult to achieve with stan-
dard 3-terminal regulators.
Load regulation typically 0.1%
Current limit constant with temperature
Eliminates the need to stock many voltages
Standard 3-lead transistor package
80dB ripple rejection
Besides replacing fixed regulators, the LM317L is useful in a
wide variety of other applications. Since the regulator is “float-
ing” and sees only the input-to-output differential voltage,
supplies of several hundred volts can be regulated as long as
the maximum input-to-output differential is not exceeded.
Available in TO-92, SO-8, or 6-Bump micro SMD package
■
■
Output is short circuit protected
See AN-1112 for micro SMD considerations
■
Also, it makes an especially simple adjustable switching reg-
ulator, a programmable output regulator, or by connecting a
Connection Diagrams
TO-92 Plastic package
8-Pin SOIC
906405
906404
Top View
© 2010 National Semiconductor Corporation
9064
www.national.com
6-Bump micro SMD
micro SMD Laser Mark
906450
906449
*NC = Not Internally connected.
Top View
(Bump Side Down)
Ordering Information
Package
TO-92
Part Number
LM317LZ
Package Marking
Media Transport
1.8k Units per Box
NSC Drawing
LM317LZ
Z03A
LM317LM
Rail
8-Pin SOIC
LM317LM
M08A
LM317LMX
2500 Units Tape and Reel
250 Units Tape and Reel
3k Units Tape and Reel
250 Units Tape and Reel
3k Units Tape and Reel
* LM317LIBP
* LM317LIBPX
* LM317LITP
* LM317LITPX
–
–
–
–
BPA06HPB
TPA06HPA
6-Bump micro SMD
Note: The micro SMD package marking is a single digit manufacturing Date
Code only.
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2
Storage Temperature
Lead Temperature
(Soldering, 4 seconds)
Output is Short Circuit Protected
ESD Susceptibility
−55°C to +150°C
260°C
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Power Dissipation
Internally Limited
40V
Human Body Model (Note 5)
2kV
Input-Output Voltage Differential
Operating Junction Temperature
Range
−40°C to +125°C
Electrical Characteristics (Note 2)
Parameter
Conditions
Min
Typ Max Units
Line Regulation
0.01 0.04 %/V
TJ = 25°C, 3V ≤ (VIN − VOUT) ≤ 40V, IL ≤ 20mA (Note 3)
Load Regulation
0.1
0.5
%
TJ = 25°C, 5mA ≤ IOUT ≤ IMAX, (Note 3)
Thermal Regulation
Adjustment Pin Current
Adjustment Pin Current
Change
TJ = 25°C, 10ms Pulse
0.04
50
0.2
100
5
%/W
μA
0.2
μA
5mA ≤ IL ≤ 100mA
3V ≤ (VIN − VOUT) ≤ 40V, P ≤ 625mW
3V ≤ (VIN − VOUT) ≤ 40V, (Note 4)
5mA ≤ IOUT ≤ 100mA, P ≤ 625mW
3V ≤ (VIN − VOUT) ≤ 40V, IL ≤ 20mA (Note 3)
5mA ≤ IOUT ≤ 100mA, (Note 3)
TMIN ≤ TJ ≤ TMax
Reference Voltage
1.20 1.25 1.30
V
Line Regulation
0.02 0.07 %/V
Load Regulation
0.3
0.65
3.5
1.5
%
%
Temperature Stability
Minimum Load Current
5
mA
(VIN − VOUT) ≤ 40V
1.5
2.5
300
150
3V ≤ (VIN − VOUT) ≤ 15V
Current Limit
100
25
200
50
mA
mA
%
3V ≤ (VIN − VOUT) ≤ 13V
(VIN − VOUT) = 40V
Rms Output Noise, % of VOUT
Ripple Rejection Ratio
0.003
TJ = 25°C, 10Hz ≤ f ≤ 10kHz
VOUT = 10V, f = 120Hz, CADJ = 0
CADJ = 10μF
65
80
dB
dB
66
Long-Term Stability
TJ = 125°C, 1000 Hours
0.3
1
%
Thermal Resistance
Junction to Ambient
Z Package 0.4″ Leads
Z Package 0.125 Leads
SO-8 Package
180
160
165
290
°C/W
°C/W
°C/W
°C/W
6-Bump micro SMD
Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device
is functional, but do not guarantee specific performance limits.
Note 2: Unless otherwise noted, these specifications apply: −25°C ≤ Tj ≤ 125°C for the LM317L; VIN − VOUT = 5V and IOUT = 40mA. Although power dissipation
is internally limited, these specifications are applicable for power dissipations up to 625mW. IMAX is 100mA.
Note 3: 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 4: Thermal resistance of the TO-92 package is 180°C/W junction to ambient with 0.4″ leads from a PC board and 160°C/W junction to ambient with 0.125″
lead length to PC board.
Note 5: The human body model is a 100pF capacitor discharged through a 1.5kΩ resistor into each pin.
3
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Typical Performance Characteristics (Output capacitor = 0μF unless otherwise noted.)
Load Regulation
Current Limit
906434
906435
906437
906439
Adjustment Current
Dropout Voltage
906436
Reference Voltage Temperature Stability
Minimum Operating Current
906438
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Ripple Rejection
Ripple Rejection
906441
906440
Output Impedance
Line Transient Response
906442
906443
Load Transient Response
Thermal Regulation
906444
906445
5
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Although the LM317L is stable with no output capacitors, like
any feedback circuit, certain values of external capacitance
can cause excessive ringing. This occurs with values be-
tween 500pF and 5000pF. A 1μF solid tantalum (or 25μF
aluminum electrolytic) on the output swamps this effect and
insures stability.
Application Hints
In operation, the LM317L develops a nominal 1.25V reference
voltage, VREF, between the output and adjustment terminal.
The reference voltage is impressed across program resistor
R1 and, since the voltage is constant, a constant current I1
then flows through the output set resistor R2, giving an output
voltage of
LOAD REGULATION
The LM317L is capable of providing extremely good load reg-
ulation but a few precautions are needed to obtain maximum
performance. The current set resistor connected between the
adjustment terminal and the output terminal (usually 240Ω)
should be tied directly to the output of the regulator rather than
near the load. This eliminates line drops from appearing ef-
fectively in series with the reference and degrading regula-
tion. For example, a 15V regulator with 0.05Ω resistance
between the regulator and load will have a load regulation due
to line resistance of 0.05Ω × IL. If the set resistor is connected
near the load the effective line resistance will be 0.05Ω (1 +
R2/R1) or in this case, 11.5 times worse.
Since the 100μA current from the adjustment terminal repre-
sents an error term, the LM317L was designed to minimize
IADJ and make it very constant with line and load changes. To
do this, all quiescent operating current is returned to the out-
put establishing a minimum load current requirement. If there
is insufficient load on the output, the output will rise.
Figure 2 shows the effect of resistance between the regulator
and 240Ω set resistor.
With the TO-92 package, it is easy to minimize the resistance
from the case to the set resistor, by using two separate leads
to the output pin. The ground of R2 can be returned near the
ground of the load to provide remote ground sensing and im-
prove load regulation.
906407
FIGURE 1.
EXTERNAL CAPACITORS
An input bypass capacitor is recommended in case the reg-
ulator is more than 6 inches away from the usual large filter
capacitor. A 0.1μF disc or 1μF solid tantalum on the input is
suitable input bypassing for almost all applications. The de-
vice is more sensitive to the absence of input bypassing when
adjustment or output capacitors are used, but the above val-
ues will eliminate the possibility of problems.
906408
FIGURE 2. Regulator with Line Resistance
in Output Lead
THERMAL REGULATION
When power is dissipated in an IC, a temperature gradient
occurs across the IC chip affecting the individual IC circuit
components. With an IC regulator, this gradient can be espe-
cially severe since power dissipation is large. Thermal regu-
lation is the effect of these temperature gradients on output
voltage (in percentage output change) per watt of power
change in a specified time. Thermal regulation error is inde-
pendent of electrical regulation or temperature coefficient,
and occurs within 5ms to 50ms after a change in power dis-
sipation. Thermal regulation depends on IC layout as well as
electrical design. The thermal regulation of a voltage regulator
is defined as the percentage change of VOUT, per watt, within
the first 10ms after a step of power is applied. The LM317L
specification is 0.2%/W, maximum.
The adjustment terminal can be bypassed to ground on the
LM317L to improve ripple rejection and noise. This bypass
capacitor prevents ripple and noise from being amplified as
the output voltage is increased. With a 10μF bypass capacitor
80dB ripple rejection is obtainable at any output level. In-
creases over 10μF do not appreciably improve the ripple
rejection at frequencies above 120Hz. If the bypass capacitor
is used, it is sometimes necessary to include protection
diodes to prevent the capacitor from discharging through in-
ternal low current paths and damaging the device.
In general, the best type of capacitors to use is solid tantalum.
Solid tantalum capacitors have low impedance even at high
frequencies. Depending upon capacitor construction, it takes
about 25μF in aluminum electrolytic to equal 1μF solid tanta-
lum at high frequencies. Ceramic capacitors are also good at
high frequencies; but some types have a large decrease in
capacitance at frequencies around 0.5MHz. For this reason,
a 0.01μF disc may seem to work better than a 0.1μF disc as
a bypass.
In the Thermal Regulation curve at the bottom of the Typical
Performance Characteristics page, a typical LM317L's output
changes only 7mV (or 0.07% of VOUT = −10V) when a 1W
pulse is applied for 10ms. This performance is thus well inside
the specification limit of 0.2%/W × 1W = 0.2% maximum.
When the 1W pulse is ended, the thermal regulation again
shows a 7mV change as the gradients across the LM317L
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6
chip die out. Note that the load regulation error of about 14mV
(0.14%) is additional to the thermal regulation error.
the rate of decrease of VIN. In the LM317L, this discharge path
is through a large junction that is able to sustain a 2A surge
with no problem. This is not true of other types of positive
regulators. For output capacitors of 25 μF or less, the
LM317L's ballast resistors and output structure limit the peak
current to a low enough level so that there is no need to use
a protection diode.
PROTECTION DIODES
When external capacitors are used with any IC regulator it is
sometimes necessary to add protection diodes to prevent the
capacitors from discharging through low current points into
the regulator. Most 10μF capacitors have low enough internal
series resistance to deliver 20A spikes when shorted. Al-
though the surge is short, there is enough energy to damage
parts of the IC.
The bypass capacitor on the adjustment terminal can dis-
charge through a low current junction. Discharge occurs when
either the input or output is shorted. Internal to the LM317L is
a 50Ω resistor which limits the peak discharge current. No
protection is needed for output voltages of 25V or less and
10μF capacitance. Figure 3 shows an LM317L with protection
diodes included for use with outputs greater than 25V and
high values of output capacitance.
When an output capacitor is connected to a regulator and the
input is shorted, the output capacitor will discharge into the
output of the regulator. The discharge current depends on the
value of the capacitor, the output voltage of the regulator, and
906409
D1 protects against C1
D2 protects against C2
FIGURE 3. Regulator with Protection Diodes
LM317L micro SMD Light Sensitivity
micro SMD does not sustain permanent damage from light
exposure. Removing the light source will cause LM317L's
VREF to recover to the proper value.
Exposing the LM317L micro SMD package to bright sunlight
may cause the VREF to drop. In a normal office environment
of fluorescent lighting the output is not affected. The LM317
7
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8
Slow Turn-On 15V Regulator
Typical Applications
Digitally Selected Outputs
906415
Adjustable Regulator with
Improved Ripple Rejection
906411
*Sets maximum VOUT
High Gain Amplifier
906416
†Solid tantalum
*Discharges C1 if output is shorted to ground
High Stability 10V Regulator
906412
Adjustable Current Limiter
906413
12 ≤ R1 ≤ 240
906417
Precision Current Limiter
Adjustable Regulator with Current Limiter
906414
906418
Short circuit current is approximately 600 mV/R3, or 60mA (compared to
LM317LZ's 200mA current limit).
At 25mA output only 3/4V of drop occurs in R3 and R4.
9
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0V–30V Regulator
Power Follower
906419
906421
Full output current not available at high input-output voltages
Regulator With 15mA Short Circuit Current
906420
Adjusting Multiple On-Card Regulators with Single Control*
906422
*All outputs within ± 100mV
†Minimum load −5mA
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10
100mA Current Regulator
5V Logic Regulator with Electronic Shutdown*
906423
1.2V–12V Regulator with Minimum Program Current
906426
*Minimum output ≈ 1.2V
Current Limited 6V Charger
906424
*Minimum load current ≈ 2 mA
50mA Constant Current Battery
Charger for Nickel-Cadmium
Batteries
906427
*Sets peak current, IPEAK = 0.6V/R1
**1000μF is recommended to filter out any input transients.
906425
11
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Short Circuit Protected 80V Supply
906428
Basic High Voltage Regulator
906429
Q1, Q2: NSD134 or similar
C1, C2: 1μF, 200V mylar**
*Heat sink
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12
Precision High Voltage Regulator
906430
Q1, Q2: NSD134 or similar
C1, C2: 1μF, 200V mylar**
*Heat sink
**Mylar is a registered trademark of DuPont Co.
R1, R2 = matched resistors with good TC tracking
Tracking Regulator
Regulator With Trimmable Output Voltage
906432
Trim Procedure:
—If VOUT is 23.08V or higher, cut out R3 (if lower, don't cut it out).
—Then if VOUT is 22.47V or higher, cut out R4 (if lower, don't).
—Then if VOUT is 22.16V or higher, cut out R5 (if lower, don't).
This will trim the output to well within ±1% of 22.00 VDC, without any of the
expense or uncertainty of a trim pot (see LB-46). Of course, this technique
can be used at any output voltage level.
906431
A1 = LM301A, LM307, or LF13741 only
13
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Precision Reference with Short-Circuit Proof Output
906433
*R1–R4 from thin-film network,
Beckman 694-3-R2K-D or similar
1.2V-25 Adjustable Regulator
Lamp Flasher
906401
Full output current not available at high input-output voltages
†Optional—improves transient response
906403
Output rate—4 flashes per second at 10% duty cycle
*Needed if device is more than 6 inches from filter capacitors
Fully Protected (Bulletproof)
Lamp Driver
906402
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14
Physical Dimensions inches (millimeters) unless otherwise noted
SO-8 Molded Package
NS Package Number M08A
15
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TO-92 Plastic Package (Z)
NS Package Number Z03A
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16
NOTE: UNLESS OTHERWISE SPECIFIED.
1. EPOXY COATING
2. 63Sn/37Pb EUTECTIC BUMP.
3. RECOMMEND NON-SOLDER MASK DEFINED LANDING PAD.
4. PIN A1 IS ESTABLISHED BY LOWER LEFT CORNER WITH RESPECT TO TEXT ORIENTATION PINS ARE NUMBERED COUNTERCLOCKWISE.
5. XXX IN DRAWING NUMBER REPRESENTS PACKAGE SIZE VARIATION WHERE X1 IS PACKAGE WIDTH, X2 IS PACKAGE LENGTH AND X3 IS PACKAGE
HEIGHT.
6. REFERENCE JEDEC REGISTRATION MO-211, VARIATION BC.
6-Bump micro SMD
NS Package Number BPA06HPB
X1 = 0.955 X2 = 1.615 X3 =0.850
17
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NOTE: UNLESS OTHERWISE SPECIFIED.
1. EPOXY COATING
2. 63Sn/37Pb EUTECTIC BUMP.
3. RECOMMEND NON-SOLDER MASK DEFINED LANDING PAD.
4. PIN A1 IS ESTABLISHED BY LOWER LEFT CORNER WITH RESPECT TO TEXT ORIENTATION PINS ARE NUMBERED COUNTERCLOCKWISE.
5. XXX IN DRAWING NUMBER REPRESENTS PACKAGE SIZE VARIATION WHERE X1 IS PACKAGE WIDTH, X2 IS PACKAGE LENGTH AND X3 IS PACKAGE
HEIGHT.
6. REFERENCE JEDEC REGISTRATION MO-211, VARIATION BC.
6-Bump micro SMD
NS Package Number TPA06HPA
X1 = 0.955 X2 = 1.615 X3 =0.500
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Notes
19
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