TI1 LM317LIBP Lm317l 3-terminal adjustable regulator Datasheet

LM317L
LM317L 3-Terminal Adjustable Regulator
Literature Number: SNVS775I
LM317L
3-Terminal Adjustable Regulator
General Description
The LM317L is an adjustable 3-terminal positive voltage regulator 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.
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 functional even if the adjustment terminal is disconnected.
Normally, no capacitors are needed unless the device is situated more than 6 inches from the input filter capacitors in
which case an input bypass is needed. An optional output capacitor 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 standard 3-terminal regulators.
Besides replacing fixed regulators, the LM317L is useful in a
wide variety of other applications. Since the regulator is “floating” 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.
Also, it makes an especially simple adjustable switching regulator, a programmable output regulator, or by connecting a
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 adjustment terminal to ground which programs the output to 1.2V
where most loads draw little current.
The LM317L is available in a standard TO-92 transistor package, the SO-8 package, and 6-Bump micro SMD package.
The LM317L is rated for operation over a −40°C to 125°C
range.
Features
■
■
■
■
■
■
■
■
■
■
■
Adjustable output down to 1.2V
Guaranteed 100mA output current
Line regulation typically 0.01%V
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
Available in TO-92, SO-8, or 6-Bump micro SMD package
Output is short circuit protected
See AN-1112 for micro SMD considerations
Connection Diagrams
TO-92 Plastic package
8-Pin SOIC
906405
906404
© 2010 National Semiconductor Corporation
9064
Top View
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LM317L 3-Terminal Adjustable Regulator
September 14, 2010
LM317L
6-Bump micro SMD
micro SMD Laser Mark
906450
906449
*NC = Not Internally connected.
Top View
(Bump Side Down)
Ordering Information
Package
TO-92
8-Pin SOIC
6-Bump micro SMD
Part Number
LM317LZ
LM317LM
LM317LMX
Package Marking
Media Transport
NSC Drawing
LM317LZ
1.8k Units per Box
Z03A
LM317LM
2500 Units Tape and Reel
* LM317LIBP
–
250 Units Tape and Reel
* LM317LIBPX
–
3k Units Tape and Reel
* LM317LITP
–
250 Units Tape and Reel
* LM317LITPX
–
3k Units Tape and Reel
Note: The micro SMD package marking is a single digit manufacturing Date
Code only.
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Rail
2
M08A
BPA06HPB
TPA06HPA
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Power Dissipation
Input-Output Voltage Differential
Operating Junction Temperature
Range
Internally Limited
40V
−55°C to +150°C
260°C
2kV
−40°C to +125°C
Electrical Characteristics
(Note 2)
Parameter
Conditions
Min
Typ
Max
Units
0.01
0.04
%/V
Line Regulation
TJ = 25°C, 3V ≤ (VIN − VOUT) ≤ 40V, IL ≤ 20mA (Note 3)
Load Regulation
TJ = 25°C, 5mA ≤ IOUT ≤ IMAX, (Note 3)
0.1
0.5
%
Thermal Regulation
TJ = 25°C, 10ms Pulse
0.04
0.2
%/W
50
100
μA
0.2
5
μA
1.25
1.30
V
Adjustment Pin Current
Adjustment Pin Current
5mA ≤ IL ≤ 100mA
Change
3V ≤ (VIN − VOUT) ≤ 40V, P ≤ 625mW
Reference Voltage
3V ≤ (VIN − VOUT) ≤ 40V, (Note 4)
1.20
5mA ≤ IOUT ≤ 100mA, P ≤ 625mW
Line Regulation
3V ≤ (VIN − VOUT) ≤ 40V, IL ≤ 20mA (Note 3)
0.02
0.07
%/V
Load Regulation
5mA ≤ IOUT ≤ 100mA, (Note 3)
0.3
1.5
%
Temperature Stability
TMIN ≤ TJ ≤ TMax
0.65
Minimum Load Current
(VIN − VOUT) ≤ 40V
3.5
5
mA
3V ≤ (VIN − VOUT) ≤ 15V
1.5
2.5
200
300
mA
50
150
mA
Current Limit
3V ≤ (VIN − VOUT) ≤ 13V
100
(VIN − VOUT) = 40V
25
Rms Output Noise, % of VOUT
TJ = 25°C, 10Hz ≤ f ≤ 10kHz
Ripple Rejection Ratio
VOUT = 10V, f = 120Hz, CADJ = 0
CADJ = 10μF
66
%
0.003
%
65
dB
80
dB
Long-Term Stability
TJ = 125°C, 1000 Hours
0.3
Thermal Resistance
Junction to Ambient
Z Package 0.4″ Leads
Z Package 0.125 Leads
SO-8 Package
6-Bump micro SMD
180
160
165
290
1
%
°C/W
°C/W
°C/W
°C/W
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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LM317L
Storage Temperature
Lead Temperature
(Soldering, 4 seconds)
Output is Short Circuit Protected
ESD Susceptibility
Human Body Model (Note 5)
Absolute Maximum Ratings (Note 1)
LM317L
Typical Performance Characteristics
(Output capacitor = 0μF unless otherwise noted.)
Load Regulation
Current Limit
906434
906435
Adjustment Current
Dropout Voltage
906436
906437
Reference Voltage Temperature Stability
Minimum Operating Current
906438
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906439
4
LM317L
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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LM317L
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 between 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 regulation 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 effectively in series with the reference and degrading regulation. 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.
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 improve load regulation.
Since the 100μA current from the adjustment terminal represents 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 output establishing a minimum load current requirement. If there
is insufficient load on the output, the output will rise.
906407
FIGURE 1.
EXTERNAL CAPACITORS
An input bypass capacitor is recommended in case the regulator 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 device is more sensitive to the absence of input bypassing when
adjustment or output capacitors are used, but the above values will eliminate the possibility of problems.
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. Increases 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 internal 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 tantalum 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.
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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 especially severe since power dissipation is large. Thermal regulation 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 independent of electrical regulation or temperature coefficient,
and occurs within 5ms to 50ms after a change in power dissipation. 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.
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
6
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.
The bypass capacitor on the adjustment terminal can discharge 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.
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. Although the surge is short, there is enough energy to damage
parts of the IC.
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
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.
LM317L micro SMD Light Sensitivity
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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LM317L
chip die out. Note that the load regulation error of about 14mV
(0.14%) is additional to the thermal regulation error.
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8
Schematic Diagram
906410
LM317L
LM317L
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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LM317L
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
5V Logic Regulator with Electronic Shutdown*
906423
1.2V–12V Regulator with Minimum Program Current
*Minimum output ≈ 1.2V
906426
Current Limited 6V Charger
*Minimum load current ≈ 2 mA
906424
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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LM317L
100mA Current Regulator
LM317L
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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LM317L
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.
Tracking Regulator
R1, R2 = matched resistors with good TC tracking
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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LM317L
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
*Needed if device is more than 6 inches from filter capacitors
906403
Output rate—4 flashes per second at 10% duty cycle
Fully Protected (Bulletproof)
Lamp Driver
906402
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14
LM317L
Physical Dimensions inches (millimeters) unless otherwise noted
SO-8 Molded Package
NS Package Number M08A
15
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LM317L
TO-92 Plastic Package (Z)
NS Package Number Z03A
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16
LM317L
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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LM317L
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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18
LM317L
Notes
19
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LM317L 3-Terminal Adjustable Regulator
Notes
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