TI1 JL117BXA Lm117jan 3-terminal adjustable regulator Datasheet

LM117JAN
LM117JAN 3-Terminal Adjustable Regulator
Literature Number: SNVS365
LM117JAN
3-Terminal Adjustable Regulator
General Description
The LM117 adjustable 3-terminal positive voltage regulator
is capable of supplying either 0.5A or 1.5A 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.
In addition to higher performance than fixed regulators, the
LM117 series offers full overload protection available only in
IC’s. 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.
“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, i.e., avoid short-circuiting the output.
Also, it makes an especially simple adjustable switching
regulator, a programmable output regulator, or by connecting
a fixed resistor between the adjustment pin and output, the
LM117 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.
For the negative complement, see LM137 series data sheet.
Features
n
n
n
n
n
Guaranteed 0.5A or 1.5A output current
Adjustable output down to 1.2V
Current limit constant with temperature
80 dB ripple rejection
Output is short-circuit protected
Besides replacing fixed regulators, the LM117 is useful in a
wide variety of other applications. Since the regulator is
Ordering Information
NS Part Number
JAN Part Number
NS Package Number
Package Description
JL117BXA
JL117SXA
JM38510/11703BXA
H03A
3LD T0–39 Metal Can
JM38510/11703SXA
H03A
3LD T0–39 Metal Can
JL117BYA
JM38510/11704BYA
K02C
2LD T0–3 Metal Can
JL117SYA
JM38510/11704SYA
K02C
2LD T0–3 Metal Can
Connection Diagrams
(TO-3)
Metal Can Package
(TO-39)
Metal Can Package
20149031
CASE IS OUTPUT
20149030
CASE IS OUTPUT
Bottom View
NS Package Number H03A
Bottom View
Steel Package
NS Package Number K02C
© 2006 National Semiconductor Corporation
DS201490
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LM117JAN 3-Terminal Adjustable Regulator
March 2006
LM117JAN
Connection Diagrams
(Continued)
LM117 Series Packages
Part
Number
Design
Package
Suffix
Load
Current
K
TO-3
1.5A
H
T0–39
0.5A
Schematic Diagram
20149008
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2
LM117JAN
Absolute Maximum Ratings (Note 1)
Power Dissipation (Note 2)
Internally Limited
Input-Output Voltage Differential
+40V, −0.3V
−65˚C ≤ TA ≤ +150˚C
Storage Temperature
Maximum Junction Temperature (TJmax)
+150˚C
Lead Temperature
300˚C
Metal Package
Thermal Resistance
θJA
T0–3 Still Air
39˚C/W
T0–3 500LF/Min Air flow
14˚C/W
T0–39 Still Air
186˚C/W
T0–39 500LF/Min Air flow
64˚C/W
θJC
T0–3
1.9˚C/W
T0–39 Metal Can
21˚C/W
ESD Tolerance (Note 3)
3KV
Recommended Operating Conditions
−55˚C ≤ TA ≤ +125˚C
Operating Temperature Range
Input Voltage Range
4.25V to 41.25V
Quality Conformance Inspection
MIL-STD-883, Method 5005 - Group A
Subgroup
Description
1
Static tests at
Temp ˚C
25
2
Static tests at
125
3
Static tests at
-55
4
Dynamic tests at
25
5
Dynamic tests at
125
6
Dynamic tests at
-55
7
Functional tests at
25
8A
Functional tests at
125
8B
Functional tests at
-55
9
Switching tests at
25
10
Switching tests at
125
11
Switching tests at
-55
12
Settling time at
25
13
Settling time at
125
14
Settling time at
-55
3
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LM117JAN
LM117H JAN Electrical Characteristics
DC Parameters
Symbol
VO
VRLine
VRLoad
Min
Max
Unit
Subgroup
VI = 4.25V, IL = -5mA
1.2
1.3
V
1, 2, 3
VI = 4.25V, IL = -500mA
1.2
1.3
V
1, 2, 3
VI = 41.25V, IL = -5mA
1.2
1.3
V
1, 2, 3
VI = 41.25V, IL = -50mA
1.2
1.3
V
1, 2, 3
4.25V ≤ VI ≤ 41.25V,
IL = -5mA
-9.0
9.0
mV
1
-23
23
mV
2, 3
VI = 6.25V,
-500mA ≤ IL ≤ -5mA
-12
12
mV
1, 2, 3
VI = 41.25V,
-50mA ≤ IL ≤ -5mA
-12
12
mV
1, 2, 3
Parameter
Output Voltage
Line Regulation
Load Regulation
Conditions
Notes
θR
Thermal Regulation
VI = 14.6V, IL = -500mA
-12
12
mV
1
IAdj
Adjust Pin Current
VI = 4.25V, IL = -5mA
-100
-15
µA
1, 2, 3
VI = 41.25V, IL = -5mA
-100
-15
µA
1, 2, 3
∆IAdj / Line Adjust Pin Current Change
4.25V ≤ VI ≤ 41.25V,
IL = -5mA
-5.0
5.0
µA
1, 2, 3
∆IAdj / Load Adjust Pin Current Change
VI = 6.25V,
-500mA ≤ IL ≤ -5mA
-5.0
5.0
µA
1, 2, 3
IOS
Output Short Circuit Current
VI = 4.25V
-1.8
-0.5
A
1, 2, 3
VI = 40V
-0.5
-0.05
A
1, 2, 3
VO Recov
Output Voltage Recovery
VI = 4.25V, RL = 2.5Ω,
CL = 20µF
1.2
1.3
V
1, 2, 3
VI = 40V, RL = 250Ω
1.2
1.3
V
1, 2, 3
VI = 4.25V,
Forced VO = 1.4V
-3.0
-0.5
mA
1, 2, 3
VI = 14.25V,
Forced VO = 1.4V
-3.0
-0.5
mA
1, 2, 3
VI = 41.25V,
Forced VO = 1.4V
-5.0
-1.0
mA
1, 2, 3
1.2
1.3
V
1, 2, 3
(Note 4)
1.2
1.3
V
2
Notes
Min
Max
Unit
Subgroup
120
µVRMS
7
6
mV/V
7
0.6
mV/mA
7
dB
4
IQ
Minimum Load Current
VStart
Voltage Start-Up
VI = 4.25V, RL = 2.5Ω,
CL=20µF, IL = -500mA
VO
Output Voltage
VI = 6.25V, IL = -5mA
AC Parameters
Symbol
Parameter
Conditions
VNO
Output Noise Voltage
VI = 6.25V, IL = -50mA
∆VO / ∆VI
Line Transient Response
VI = 6.25V, ∆VI = 3V,
IL = -10mA
∆VO / ∆IL
Load Transient Response
VI = 6.25V, ∆IL = -200mA,
IL = -50mA
∆VI / ∆VO
Ripple Rejection
VI = 6.25V, IL = -125mA
eI = 1VRMS at ƒ = 2400Hz,
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65
JAN Electrical Characteristics
LM117JAN
LM117H
(Continued)
DC Drift Parameters
Deltas performed on JAN S devices at Group B, Subgroup 5, only.
Symbol
VO
Parameter
Output Voltage
Min
Max
Unit
Subgroup
VI = 4.25V, IL = -5mA
-0.01
0.01
V
1
VI = 4.25V, IL = -500mA
-0.01
0.01
V
1
VI = 41.25V, IL = -5mA
-0.01
0.01
V
1
VI = 41.25V, IL = -50mA
-0.01
0.01
V
1
-4.0
4.0
mV
1
Conditions
Notes
VRLine
Line Regulation
4.25V ≤ VI ≤ 41.25V,
IL = -5mA
IAdj
Adjust Pin Current
VI = 4.25V, IL = -5mA
-10
10
µA
1
VI = 41.25V, IL = -5mA
-10
10
µA
1
5
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LM117JAN
LM117K JAN Electrical Characteristics
DC Parameters
Symbol
VO
VRLine
VRLoad
Min
Max
Unit
Subgroup
VI = 4.25V, IL = -5mA
1.2
1.3
V
1, 2, 3
VI = 4.25V, IL = -1.5A
1.2
1.3
V
1, 2, 3
VI = 41.25V, IL = -5mA
1.2
1.3
V
1, 2, 3
VI = 41.25V, IL = -200mA
1.2
1.3
V
1, 2, 3
4.25V ≤ VI ≤ 41.25V,
IL = -5mA
-9.0
9.0
mV
1
-23
23
mV
2, 3
VI = 6.25V,
-1.5A ≤ IL ≤ -5mA
-3.5
3.5
mV
1
-12
12
mV
2, 3
VI = 41.25V,
-200mA ≤ IL ≤ -5mA
-3.5
3.5
mV
1
-12
12
mV
2, 3
Parameter
Output Voltage
Line Regulation
Load Regulation
Conditions
Notes
θR
Thermal Regulation
VI = 14.6V, IL = -1.5A
-12
12
mV
1
IAdj
Adjust Pin Current
VI = 4.25V, IL = -5mA
-100
-15
µA
1, 2, 3
VI = 41.25V, IL = -5mA
-100
-15
µA
1, 2, 3
∆IAdj / Line Adjust Pin Current Change
4.25V ≤ VI ≤ 41.25V,
IL = -5mA
-5.0
5.0
µA
1, 2, 3
∆IAdj / Load Adjust Pin Current Change
VI = 6.25V,
-1.5A ≤ IL ≤ -5mA
-5.0
5.0
µA
1, 2, 3
IOS
VI = 4.25V
-3.5
-1.5
A
1, 2, 3
VI = 40V
-1.0
-0.18
A
1, 2, 3
1.2
1.3
V
1, 2, 3
Output Short Circuit Current
VO Recov
Output Voltage Recovery
VI = 4.25V, RL = 0.833Ω,
CL = 20µF
VI = 40V, RL = 250Ω
1.2
1.3
V
1, 2, 3
IQ
Minimum Load Current
VI = 4.25V,
Forced VO = 1.4V
-3.0
-0.2
mA
1, 2, 3
VI = 14.25V,
Forced VO = 1.4V
-3.0
-0.2
mA
1, 2, 3
VI = 41.25V,
Forced VO = 1.4V
-5.0
-0.2
mA
1, 2, 3
1.2
1.3
V
1, 2, 3
(Note 4)
1.2
1.3
V
2
Notes
Min
Max
Unit
Subgroup
VStart
Voltage Start-Up
VI = 4.25V, RL = 0.833Ω,
CL=20µF, IL = -1.5A
VO
Output Voltage
VI = 6.25V, IL = -5mA
AC Parameters
Symbol
Parameter
Conditions
VNO
Output Noise Voltage
VI = 6.25V, IL = -100mA
120
µVRMS
7
∆VO / ∆VI
Line Transient Response
VI = 6.25V, ∆VI = 3V,
IL = -10mA
(Note 5)
18
mV
7
∆VO / ∆IL
Load Transient Response
VI = 6.25V, ∆IL = -400mA,
IL = -100mA
(Note 6)
120
mV
7
∆VI / ∆VO
Ripple Rejection
VI = 6.25V, IL = -500mA
eI = 1VRMS at ƒ = 2400Hz,
dB
4
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65
JAN Electrical Characteristics
LM117JAN
LM117K
(Continued)
DC Drift Parameters
Deltas performed on JAN S devices at Group B, Subgroup 5, only.
Symbol
VO
Parameter
Output Voltage
Min
Max
Unit
Subgroup
VI = 4.25V, IL = -5mA
-0.01
0.01
V
1
VI = 4.25V, IL = -1.5A
-0.01
0.01
V
1
VI = 41.25V, IL = -5mA
-0.01
0.01
V
1
VI = 41.25V, IL = -200mA
-0.01
0.01
V
1
-4.0
4.0
mV
1
Conditions
Notes
VRLine
Line Regulation
4.25V ≤ VI ≤ 41.25V,
IL = -5mA
IAdj
Adjust Pin Current
VI = 4.25V, IL = -5mA
-10
10
µA
1
VI = 41.25V, IL = -5mA
-10
10
µA
1
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. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed
specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test
conditions.
Note 2: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJmax (maximum junction temperature), θJA (package junction
to ambient thermal resistance), and TA (ambient temperature). The maximum allowable power dissipation at any temperature is PDmax = (TJmax - TA)/θJA or the
number given in the Absolute Maximum Ratings, whichever is lower. "Although power dissipation is internally limited, these specifications are applicable for power
dissipations of 2W for the TO39 package and 20W for the TO3 package."
Note 3: Human body model, 100 pF discharged through a 1.5 kΩ resistor.
Note 4: Tested @ TA = 125˚C, correlated to TA = 150˚C
Note 5: SS limit of 6mV/V is equivalent to 18mV
Note 6: SS limit of 0.3mV/V is equivalent to 120mV
7
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LM117JAN
Typical Performance Characteristics
Output Capacitor = 0µF unless otherwise noted
Load Regulation
Current Limit
20149037
20149038
Adjustment Current
Dropout Voltage
20149040
20149039
Temperature Stability
Minimum Operating Current
20149041
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20149042
8
Ripple Rejection
(Continued)
Ripple Rejection
20149044
20149043
Ripple Rejection
Output Impedance
20149046
20149045
Line Transient Response
Load Transient Response
20149047
20149048
9
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LM117JAN
Typical Performance Characteristics Output Capacitor = 0µF unless otherwise noted
LM117JAN
can cause excessive ringing. This occurs with values between 500 pF and 5000 pF. A 1µF solid tantalum (or 25µF
aluminum electrolytic) on the output swamps this effect and
insures stability. Any increase of the load capacitance larger
than 10µF will merely improve the loop stability and output
impedance.
Application Hints
In operation, the LM117 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 LM117 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 (case) 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 x 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.
20149005
FIGURE 1.
Since the 100µA current from the adjustment terminal represents an error term, the LM117 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.
20149006
FIGURE 2. Regulator with Line Resistance in Output
Lead
EXTERNAL CAPACITORS
An input bypass capacitor is recommended. 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
LM117 to improve ripple rejection. This bypass capacitor
prevents ripple 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, 0.01µF disc may seem to work better than a
0.1µF disc as a bypass.
Although the LM117 is stable with no output capacitors, like
any feedback circuit, certain values of external capacitance
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With the TO-3 package, it is easy to minimize the resistance
from the case to the set resistor, by using two separate leads
to the case. However, with the TO-39 package, care should
be taken to minimize the wire length of the output lead. The
ground of R2 can be returned near the ground of the load to
provide remote ground sensing and improve load regulation.
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 the rate of decrease of VIN. In the LM117, this
discharge path is through a large junction that is able to
sustain 15A surge with no problem. This is not true of other
types of positive regulators. For output capacitors of 25µF or
less, there is no need to use diodes.
The bypass capacitor on the adjustment terminal can discharge through a low current junction. Discharge occurs
10
When a value for θ(H−A) is found using the equation shown,
a heatsink must be selected that has a value that is less than
or equal to this number.
θ(H−A) is specified numerically by the heatsink manufacturer
in the catalog, or shown in a curve that plots temperature rise
vs power dissipation for the heatsink.
(Continued)
when either the input or output is shorted. Internal to the
LM117 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 LM117
with protection diodes included for use with outputs greater
than 25V and high values of output capacitance.
20149007
D1 protects against C1
D2 protects against C2
FIGURE 3. Regulator with Protection Diodes
Typical Applications
5V Logic Regulator with Electronic Shutdown*
Slow Turn-On 15V Regulator
20149009
20149003
*Min. output ) 1.2V
Adjustable Regulator with Improved Ripple Rejection
20149010
†Solid tantalum
*Discharges C1 if output is shorted to ground
11
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LM117JAN
Application Hints
LM117JAN
Typical Applications
(Continued)
High Stability 10V Regulator
20149011
High Current Adjustable Regulator
20149012
‡ Optional — improves ripple rejection
†Solid tantalum
*Minimum load current = 30 mA
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(Continued)
LM117JAN
Typical Applications
Power Follower
0 to 30V Regulator
20149014
20149013
Full output current not available at high input-output voltages
5A Constant Voltage/Constant Current Regulator
20149015
†Solid tantalum
*Lights in constant current mode
13
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LM117JAN
Typical Applications
(Continued)
1A Current Regulator
1.2V–20V Regulator with Minimum Program Current
20149017
20149016
*Minimum load current ) 4 mA
High Gain Amplifier
20149018
Low Cost 3A Switching Regulator
20149019
†Solid tantalum
*Core — Arnold A-254168-2 60 turns
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LM117JAN
Typical Applications
(Continued)
4A Switching Regulator with Overload Protection
20149020
†Solid tantalum
*Core — Arnold A-254168-2 60 turns
Precision Current Limiter
20149021
Tracking Preregulator
20149022
15
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LM117JAN
Typical Applications
(Continued)
Current Limited Voltage Regulator
20149023
(Compared to LM117’s higher current limit)
— At 50 mA output only 3⁄4 volt of drop occurs in R3 and R4
Adjusting Multiple On-Card Regulators with Single Control*
20149024
*All outputs within ± 100 mV
†Minimum load — 10 mA
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LM117JAN
Typical Applications
(Continued)
AC Voltage Regulator
20149025
12V Battery Charger
20149026
Use of RS allows low charging rates with fully charged battery.
50mA Constant Current Battery Charger
20149027
17
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LM117JAN
Typical Applications
(Continued)
Current Limited 6V Charger
Adjustable 4A Regulator
20149029
*Sets peak current (0.6A for 1Ω)
**The 1000µF is recommended to filter out input transients
Digitally Selected Outputs
20149028
1.2V–25V Adjustable Regulator
20149002
*Sets maximum VOUT
20149001
Full output current not available at high input-output voltages
*Needed if device is more than 6 inches from filter capacitors.
†Optional — improves transient response. Output capacitors in the range
of 1µF to 1000µF of aluminum or tantalum electrolytic are commonly used
to provide improved output impedance and rejection of transients.
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LM117JAN
Revision History
Date
Released
03/14/06
Revision
A
Section
New Release to corporate format
19
Originator
Changes
L. Lytle
2 MDS data sheets were consolidated into
one corporate data sheet format.
MJLM117–K Rev 0C1 and MJLM117–H
Rev 1A1 will be archived.
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LM117JAN
Physical Dimensions
inches (millimeters) unless otherwise noted
TO-3 Metal Can Package (K)
NS Package Number K02C
(TO-39) Metal Can Package
NS Package Number H03A
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20
LM117JAN 3-Terminal Adjustable Regulator
Notes
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves
the right at any time without notice to change said circuitry and specifications.
For the most current product information visit us at www.national.com.
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www.ti.com/audio
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amplifier.ti.com
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www.ti.com/computers
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dataconverter.ti.com
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www.ti.com/consumer-apps
DLP® Products
www.dlp.com
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dsp.ti.com
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logic.ti.com
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power.ti.com
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Microcontrollers
microcontroller.ti.com
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www.ti-rfid.com
OMAP Mobile Processors
www.ti.com/omap
Wireless Connectivity
www.ti.com/wirelessconnectivity
TI E2E Community Home Page
www.ti.com/video
e2e.ti.com
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