LM117QML
3-Terminal Adjustable Regulator
General Description
The LM117 series of adjustable 3-terminal positive voltage
regulators is capable of supplying either 0.5A or 1.5A over a
1.2V to 37V output range. They are exceptionally easy to
use and require 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 ter-
minal 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 stan-
dard 3-terminal regulators.
Besides replacing fixed regulators, the LM117 is useful in a
wide variety of other applications. Since the regulator is
“floating” and sees only the input-to-output differential volt-
age, supplies of several hundred volts can be regulated as
long as the maximum input to output differential is not ex-
ceeded, 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. Sup-
plies with electronic shutdown can be achieved by clamping
the adjustment terminal to ground which programs the out-
put to 1.2V where most loads draw little current.
For the negative complement, see LM137 series data sheet.
Features
nAvailable with Radiation Guarantee
nGuaranteed max. 0.3% load regulation (LM117)
nGuaranteed 0.5A or 1.5A output current
nAdjustable output down to 1.2V
nCurrent limit constant with temperature
n80 dB ripple rejection
nOutput is short-circuit protected
Ordering Information
NS Part Number JAN Part Number NS Package Number Package Description
LM117E/883 E20A 20LD LCC
LM117H/883 H03A 3LD T0–39 Metal Can
LM117HRQMLV
(Note 11)
5962R9951703VXA
100K rd(Si)
H03A 3LD T0–39 Metal Can
LM117HRLQMLV
(Note 12)
5962R9951705VXA
100K rd(Si)
H03A 3LD T0–39 Metal Can
LM117K/883 K02C 2LD T0–3 Metal Can
LM117KRQMLV
(Note 11)
5962R9951704VYA
100K rd(Si)
K02C 2LD T0–3 Metal Can
LM117WG/883 WG16A 16LD Ceramic SOIC
LM117WG-QMLV 5962–9951703VZA WG16A 16LD Ceramic SOIC
LM117WGRQMLV
(Note 11)
5962R9951703VZA
100K rd(Si)
WG16A 16LD Ceramic SOIC
LM117WGRLQMLV
(Note 12)
5962R9951705VZA
100K rd(Si)
WG16A 16LD Ceramic SOIC
June 2006
LM117QML 3-Terminal Adjustable Regulator
© 2006 National Semiconductor Corporation DS201436 www.national.com
Connection Diagrams
(TO-3)
Metal Can Package
(TO-39)
Metal Can Package
20143630
CASE IS OUTPUT
Bottom View
Steel Package
NS Package Number K02C
20143631
CASE IS OUTPUT
Bottom View
NS Package Number H03A
Ceramic SOIC
Chip Carrier
Ceramic Leadless
Chip Carrier
20143667
Top View
NS Package Number WG16A
(Note 4)
20143634
Top View
NS Package Number E20A
LM117 Series Packages
Part Design
Number Package Load
Suffix Current
K TO-3 1.5A
H T0–39 0.5A
WG Ceramic SOIC 0.5A
E LCC 0.5A
LM117QML
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Schematic Diagram
20143608
LM117QML
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Absolute Maximum Ratings (Note 1)
Power Dissipation (Note 2) Internally Limited
Input-Output Voltage Differential +40V, −0.3V
Storage Temperature −65˚C ≤T
A
≤+150˚C
Maximum Junction Temperature (T
Jmax
+150˚C
Lead Temperature Metal Package 300˚C
Thermal Resistance
θ
JA
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
Ceramic SOIC Still Air 115˚C/W
Ceramic SOIC 500LF/Min Air flow 66˚C/W
LCC Still Air 88˚C/W
LCC 500LF/Min Air flow 62˚C/W
θ
JC
T0–3 1.9˚C/W
T0–39 Metal Can 21˚C/W
Ceramic SOIC (Note 5) 3.4˚C/W
LCC 12˚C/W
Package Weight
T0–39 Metal Can TBD
SOIC 365mg
ESD Tolerance (Note 3) 3KV
Recommended Operating Conditions
Operating Temperature Range −55˚C ≤T
A
≤+125˚C
Input Voltage Range 4.25V to 41.25V
Quality Conformance Inspection
MIL-STD-883, Method 5005 - Group A
Subgroup Description Temp ˚C
1 Static tests at 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
LM117QML
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LM117H & WG Electrical Characteristics
DC Parameters
The following conditions apply, unless otherwise specified.
DC: V
Diff
=(V
I
−V
O
), I
L
= 8mA
Symbol Parameter Conditions Notes Min Max Unit
Sub
groups
I
Adj
Adjustment Pin Current
V
Diff
= 3V 100 µA 1
V
Diff
= 3.3V 100 µA 2, 3
V
Diff
= 40V 100 µA 1, 2, 3
I
Q
Minimum Load Current V
Diff
= 3V, V
O
= 1.7V 5.0 mA 1
V
Diff
= 3.3V, V
O
= 1.7V 5.0 mA 2, 3
V
Diff
= 40V, V
O
= 1.7V 5.0 mA 1, 2, 3
V
Ref
Reference Voltage V
Diff
= 3V 1.2 1.3 V 1
V
Diff
= 3.3V 1.2 1.3 V 2, 3
V
Diff
= 40V 1.2 1.3 V 1, 2, 3
V
RLine
Line Regulation 3V ≤V
Diff
≤40V,
V
O
= 1.2V
-8.9 8.9 mV 1
3.3V ≤V
Diff
≤40V,
V
O
= 1.2V
-22.2 22.2 mV 2, 3
V
RLoad
Load Regulation V
Diff
= 3V,
I
L
= 10mA to 500mA
-15 15 mV 1
V
Diff
= 3.3V,
I
L
= 10mA to 500mA
-15 15 mV 2, 3
V
Diff
= 40V,
I
L
= 10mA to 150mA
-15 15 mV 1
V
Diff
= 40V,
I
L
= 10mA to 100mA
-15 15 mV 2, 3
∆I
Adj
/
Load
Adjustment Current Change V
Diff
= 3V,
I
L
= 10mA to 500mA
-5.0 5.0 µA 1
V
Diff
= 3.3V,
I
L
= 10mA to 500mA
-5.0 5.0 µA 2, 3
V
Diff
= 40V,
I
L
= 10mA to 150mA
-5.0 5.0 µA 1
V
Diff
= 40V,
I
L
= 10mA to 100mA
-5.0 5.0 µA 2, 3
∆I
Adj
/ Line Adjustment Current Change 3V ≤V
Diff
≤40V -5.0 5.0 µA 1
3.3V ≤V
Diff
≤40V -5.0 5.0 µA 2, 3
I
OS
Short Circuit Current V
Diff
= 10V 0.45 1.6 A 1
θ
R
Thermal Regulation T
A
= 25˚C, t = 20mS,
V
Diff
= 40V, I
L
= 150mA
-6.0 6.0 mV 1
I
CL
Current Limit V
Diff
≤15V (Note 6) 0.5 A 1, 2, 3
V
Diff
= 40V (Note 6) 0.15 A 1
AC Parameters
Symbol Parameter Conditions Notes Min Max Unit Subgroups
RR Ripple Rejection
V
I
= +6.25V, V
O
=V
Ref
,
ƒ= 120Hz, e
I
=1V
RMS
,
I
L
= 125mA
(Note 7) 66 dB 4, 5, 6
LM117QML
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LM117K Electrical Characteristics
DC Parameters
The following conditions apply, unless otherwise specified.
DC: V
Diff
=(V
I
−V
O
), I
L
= 10mA
Symbol Parameter Conditions Notes Min Max Unit
Sub
groups
I
Adj
Adjustment Pin Current
V
Diff
= 3V 100 µA 1
V
Diff
= 3.3V 100 µA 2, 3
V
Diff
= 40V 100 µA 1, 2, 3
I
Q
Minimum Load Current V
Diff
= 3V, V
O
= 1.7V 5.0 mA 1
V
Diff
= 3.3V, V
O
= 1.7V 5.0 mA 2, 3
V
Diff
= 40V, V
O
= 1.7V 5.0 mA 1, 2, 3
V
Ref
Reference Voltage V
Diff
= 3V 1.2 1.3 V 1
V
Diff
= 3.3V 1.2 1.3 V 2, 3
V
Diff
= 40V 1.2 1.3 V 1, 2, 3
V
RLine
Line Regulation 3V ≤V
Diff
≤40V,
V
O
= 1.2V
-8.9 8.9 mV 1
3.3V ≤V
Diff
≤40V,
V
O
= 1.2V
-22.2 22.2 mV 2, 3
V
RLoad
Load Regulation V
Diff
= 3V,
I
L
= 10mA to 1.5A
-15 15 mV 1
V
Diff
= 3.3V,
I
L
= 10mA to 1.5A
-15 15 mV 2, 3
V
Diff
= 40V,
I
L
= 10mA to 300mA
-15 15 mV 1
V
Diff
= 40V,
I
L
= 10mA to 195mA
-15 15 mV 2, 3
∆I
Adj
/
Load
Adjustment Current Change V
Diff
= 3V,
I
L
= 10mA to 1.5A
-5.0 5.0 µA 1
V
Diff
= 3.3V,
I
L
= 10mA to 1.5A
-5.0 5.0 µA 2, 3
V
Diff
= 40V,
I
L
= 10mA to 300mA
-5.0 5.0 µA 1
V
Diff
= 40V,
I
L
= 10mA to 195mA
-5.0 5.0 µA 2, 3
∆I
Adj
/ Line Adjustment Current Change 3V ≤V
Diff
≤40V -5.0 5.0 µA 1
3.3V ≤V
Diff
≤40V -5.0 5.0 µA 2, 3
I
OS
Short Circuit Current V
Diff
= 10V 1.6 3.4 A 1
θ
R
Thermal Regulation T
A
= 25˚C, t = 20mS,
V
Diff
= 40V, I
L
= 300mA
-10.5 10.5 mV 1
I
CL
Current Limit V
Diff
≤15V (Note 6) 1.5 A 1, 2, 3
V
Diff
= 40V (Note 6) 0.3 A 1
AC Parameters
Symbol Parameter Conditions Notes Min Max Unit Subgroups
RR Ripple Rejection
V
I
= +6.25V, V
O
=V
Ref
,
ƒ= 120Hz, e
I
=1V
RMS
,
I
L
= 0.5A
(Note 7) 66 dB 4, 5, 6
LM117QML
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LM117E Electrical Characteristics
DC Parameters
The following conditions apply, unless otherwise specified.
DC: V
Diff
=(V
I
−V
O
), I
L
= 8mA, P
D
≤1.5W
Symbol Parameter Conditions Notes Min Max Unit
Sub
groups
I
Adj
Adjustment Pin Current
V
Diff
= 3V 100 µA 1
V
Diff
= 3.3V 100 µA 2, 3
V
Diff
= 40V 100 µA 1, 2, 3
I
Q
Minimum Load Current V
Diff
= 3V, V
O
= 1.7V 5.0 mA 1
V
Diff
= 3.3V, V
O
= 1.7V 5.0 mA 2, 3
V
Diff
= 40V, V
O
= 1.7V 5.0 mA 1, 2, 3
V
Ref
Reference Voltage V
Diff
= 3V 1.2 1.3 V 1
V
Diff
= 3.3V 1.2 1.3 V 2, 3
V
Diff
= 40V 1.2 1.3 V 1, 2, 3
V
RLine
Line Regulation 3V ≤V
Diff
≤40V,
V
O
= 1.2V
-8.9 8.9 mV 1
3.3V ≤V
Diff
≤40V,
V
O
= 1.2V
-22.2 22.2 mV 2, 3
V
RLoad
Load Regulation V
Diff
= 3V,
I
L
= 10mA to 100mA
-15 15 mV 1
V
Diff
= 3.3V,
I
L
= 10mA to 100mA
-15 15 mV 2, 3
V
Diff
= 40V,
I
L
= 10mA to 100mA
-15 15 mV 1,2
−25 25 mV 3
V
Diff
= 3V,
I
L
= 10mA to 500mA
-15 15 mV 1
V
Diff
= 3.3V,
I
L
= 10mA to 500mA
-15 15 mV 2, 3
∆I
Adj
/
Load
Adjustment Current Change V
Diff
= 3V,
I
L
= 10mA to 500mA
-5.0 5.0 µA 1
V
Diff
= 3.3V,
I
L
= 10mA to 500mA
-5.0 5.0 µA 2, 3
V
Diff
= 40V,
I
L
= 10mA to 100mA
-5.0 5.0 µA 1, 2, 3
∆I
Adj
/ Line Adjustment Current Change 3V ≤V
Diff
≤40V -5.0 5.0 µA 1
3.3V ≤V
Diff
≤40V -5.0 5.0 µA 2, 3
I
OS
Short Circuit Current V
Diff
= 10V 0.45 1.6 A 1
θ
R
Thermal Regulation T
A
= 25˚C, t = 20mS,
V
Diff
= 40V, I
L
= 75mA
-6.0 6.0 mV 1
I
CL
Current Limit V
Diff
≤15V (Note 6) 0.5 A 1, 2, 3
V
Diff
= 40V (Note 6) 0.15 A 1
AC Parameters
Symbol Parameter Conditions Notes Min Max Unit Subgroups
RR Ripple Rejection
V
I
= +6.25V, V
O
=V
Ref
,
ƒ= 120Hz, e
I
=1V
RMS
,
I
L
= 100mA, C
Adj
= 10µf
(Note 7) 66 dB 4, 5, 6
LM117QML
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LM117H & WG RH Electrical Characteristics
DC Parameters (Notes 11, 12)
Symbol Parameter Conditions Notes Min Max Unit Subgroups
V
O
Output Voltage V
I
= 4.25V, I
L
= -5mA 1.2 1.3 V 1, 2, 3
V
I
= 4.25V, I
L
= -500mA 1.2 1.3 V 1, 2, 3
V
I
= 41.25V, I
L
= -5mA 1.2 1.3 V 1, 2, 3
V
I
= 41.25V, I
L
= -50mA 1.2 1.3 V 1, 2, 3
V
RLine
Line Regulation 4.25V ≤V
I
≤41.25V,
I
L
= -5mA
-9.0 9.0 mV 1
-23 23 mV 2,3
V
RLoad
Load Regulation V
I
= 6.25V,
-500mA ≤I
L
≤-5mA
-12 12 mV 1, 2, 3
V
I
= 41.25V,
-50mA ≤I
L
≤-5mA
-12 12 mV 1, 2, 3
V
RTh
Thermal Regulation V
I
= 14.6V, I
L
= -500mA -12 12 mV 1
I
Adj
Adjust Pin Current V
I
= 4.25V, I
L
= -5mA -100 -15 µA 1, 2, 3
V
I
= 41.25V, I
L
= -5mA -100 -15 µA 1, 2, 3
∆I
Adj
/ Line Adjust Pin Current Change 4.25V ≤V
I
≤41.25V,
I
L
= -5mA
-5.0 5.0 µA 1, 2, 3
∆I
Adj
/
Load
Adjust Pin Current Change V
I
= 6.25V,
-500mA ≤I
L
≤-5mA
-5.0 5.0 µA 1, 2, 3
I
Q
Minimum Load Current V
I
= 4.25V,
Forced V
O
= 1.4V
-3.0 -0.5 mA 1, 2, 3
V
I
= 14.25V,
Forced V
O
= 1.4V
-3.0 -0.5 mA 1, 2, 3
V
I
= 41.25V,
Forced V
O
= 1.4V
-5.0 -1.0 mA 1, 2, 3
I
OS
Output Short Circuit Current V
I
= 4.25V -1.8 -0.5 A 1, 2, 3
V
I
= 40V -0.5 -0.05 A 1, 2, 3
V
O
(Recov) Output Voltage Recovery V
I
= 4.25V, R
L
= 2.5Ω,
C
L
= 20µF
1.2 1.3 V 1, 2, 3
V
I
= 40V, R
L
= 250Ω1.2 1.3 V 1, 2, 3
V
O
Output Voltage V
I
= 6.25V, I
L
= -5mA (Note 8) 1.2 1.3 V 2
V
Start
Voltage Start-Up V
I
= 4.25V, R
L
= 2.5Ω,
C
L
= 20µF, I
L
= -500mA
1.2 1.3 V 1, 2, 3
AC Parameters (Notes 11, 12)
Symbol Parameter Conditions Notes Min Max Unit Sub
groups
V
NO
Output Noise Voltage V
I
= 6.25V, I
L
= -50mA 120 µV
RMS
7
∆V
O
/∆V
I
Line Transient Response V
I
= 6.25V, ∆V
I
= 3V,
I
L
= -10mA
6.0 mV/V 7
∆V
O
/∆I
L
Load Transient Response V
I
= 6.25V, ∆I
L
= -200mA,
I
L
= -50mA
0.6 mV/mA 7
∆V
I
/∆V
O
Ripple Rejection V
I
= 6.25V, I
L
= -125mA,
E
I
=1V
RMS
at ƒ = 2400Hz
65 dB 4
LM117QML
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LM117H & WG RH Electrical Characteristics (Continued)
DC Drift Parameters
The following conditions apply, unless otherwise specified.
Deltas performed on QMLV devices at Group B, Subgroup 5, only.
Symbol Parameter Conditions Notes Min Max Unit Subgroups
V
O
Output Voltage V
I
= 4.25V, I
L
= -5mA -0.01 0.01 V 1
V
I
= 4.25V, I
L
= -500mA -0.01 0.01 V 1
V
I
= 41.25V, I
L
= -5mA -0.01 0.01 V 1
V
I
= 41.25V, I
L
= -50mA -0.01 0.01 V 1
V
RLine
Line Regulation 4.25V ≤V
I
≤41.25V,
I
L
= -5mA
-4.0 4.0 mV 1
I
Adj
Adjust Pin Current V
I
= 4.25V, I
L
= -5mA -10 10 µA 1
V
I
= 41.25V, I
L
= -5mA -10 10 µA 1
AC/DC Post Radiation Limits @+25˚C (Notes 11, 12)
Symbol Parameter Conditions Notes Min Max Unit Subgroups
V
O
Output Voltage V
I
= 4.25V, I
L
= -5mA 1.2 1.350 V 1
V
I
= 4.25V, I
L
= -500mA 1.2 1.350 V 1
V
I
= 41.25V, I
L
= -5mA 1.2 1.350 V 1
V
I
= 41.25V, I
L
= -50mA 1.2 1.350 V 1
V
RLine
Line Regulation 4.25V ≤V
I
≤41.25V,
I
L
= -5mA
-25 25 mV 1
∆V
I
/∆V
O
Ripple Rejection V
I
= 6.25V, I
L
= -125mA
E
I
=1V
RMS
at f = 2400Hz
60 dB 4
V
O
(Recov) Output Voltage Recovery V
I
= 4.25V, R
L
= 2.5Ω,
C
L
= 20µf
1.20 1.350 V 1
V
I
= 40V, R
L
= 250Ω1.20 1.350 V 1
LM117QML
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LM117K RH Electrical Characteristics
DC Parameters (Note 11)
Symbol Parameter Conditions Notes Min Max Unit Subgroups
V
O
Output Voltage V
I
= 4.25V, I
L
= -5mA 1.2 1.3 V 1, 2, 3
V
I
= 4.25V, I
L
= -1.5A 1.2 1.3 V 1, 2, 3
V
I
= 41.25V, I
L
= -5mA 1.2 1.3 V 1, 2, 3
V
I
= 41.25V, I
L
= -200mA 1.2 1.3 V 1, 2, 3
V
RLine
Line Regulation 4.25V ≤V
I
≤41.25V,
I
L
= -5mA
-9.0 9.0 mV 1
-23 23 mV 2,3
V
RLoad
Load Regulation V
I
= 6.25V,
-1.5A ≤I
L
≤-5mA
-3.5 3.5 mV 1
-12 12 mV 2, 3
V
I
= 41.25V,
-200mA ≤I
L
≤-5mA
-3.5 3.5 mV 1
-12 12 mV 2, 3
V
RTh
Thermal Regulation V
I
= 14.6V, I
L
= -1.5A -12 12 mV 1
I
Adj
Adjust Pin Current V
I
= 4.25V, I
L
= -5mA -100 -15 µA 1, 2, 3
V
I
= 41.25V, I
L
= -5mA -100 -15 µA 1, 2, 3
∆I
Adj
/ Line Adjust Pin Current Change 4.25V ≤V
I
≤41.25V,
I
L
= -5mA
-5.0 5.0 µA 1, 2, 3
∆I
Adj
/
Load
Adjust Pin Current Change V
I
= 6.25V,
-1.5A ≤I
L
≤-5mA
-5.0 5.0 µA 1, 2, 3
I
Q
Minimum Load Current V
I
= 4.25V,
Forced V
O
= 1.4V
-3.0 -0.2 mA 1, 2, 3
V
I
= 14.25V,
Forced V
O
= 1.4V
-3.0 -0.2 mA 1, 2, 3
V
I
= 41.25V,
Forced V
O
= 1.4V
-5.0 -0.2 mA 1, 2, 3
I
OS
Output Short Circuit Current V
I
= 4.25V -3.5 -1.5 A 1, 2, 3
V
I
= 40V -1.0 -0.18 A 1, 2, 3
V
O
(Recov) Output Voltage Recovery V
I
= 4.25V, R
L
= 0.833Ω,
C
L
= 20µF
1.2 1.3 V 1, 2, 3
V
I
= 40V, R
L
= 250Ω1.2 1.3 V 1, 2, 3
V
O
Output Voltage V
I
= 6.25V, I
L
= -5mA (Note 8) 1.2 1.3 V 2
V
Start
Voltage Start-Up V
I
= 4.25V, R
L
= 0.833Ω,
C
L
= 20µF, I
L
= -1.5A
1.2 1.3 V 1, 2, 3
AC Parameters (Note 11)
Symbol Parameter Conditions Notes Min Max Unit Sub
groups
V
NO
Output Noise Voltage V
I
= 6.25V, I
L
= -100mA 120 µV
RMS
7
∆V
O
/∆V
I
Line Transient Response V
I
= 6.25V, ∆V
I
= 3V,
I
L
= -10mA
(Note 9) 18 mV 7
∆V
O
/∆I
L
Load Transient Response V
I
= 6.25V, ∆I
L
= -400mA,
I
L
= -100mA
(Note 10) 120 mV 7
∆V
I
/∆V
O
Ripple Rejection V
I
= 6.25V, I
L
= -500mA,
E
I
=1V
RMS
at ƒ = 2400Hz
65 dB 4
LM117QML
www.national.com 10
LM117K RH Electrical Characteristics (Continued)
DC Drift Parameters
The following conditions apply, unless otherwise specified.
Deltas performed on QMLV devices at Group B, Subgroup 5, only.
Symbol Parameter Conditions Notes Min Max Unit Subgroups
V
O
Output Voltage V
I
= 4.25V, I
L
= -5mA -0.01 0.01 V 1
V
I
= 4.25V, I
L
= -1.5A -0.01 0.01 V 1
V
I
= 41.25V, I
L
= -5mA -0.01 0.01 V 1
V
I
= 41.25V, I
L
= -200mA -0.01 0.01 V 1
V
RLine
Line Regulation 4.25V ≤V
I
≤41.25V,
I
L
= -5mA
-4.0 4.0 mV 1
I
Adj
Adjust Pin Current V
I
= 4.25V, I
L
= -5mA -10 10 µA 1
V
I
= 41.25V, I
L
= -5mA -10 10 µA 1
AC/DC Post Radiation Limits @+25˚C (Note 11)
Symbol Parameter Conditions Notes Min Max Unit Subgroups
V
O
Output Voltage V
I
= 4.25V, I
L
= -5mA 1.2 1.350 V 1
V
I
= 4.25V, I
L
= -1.5A 1.2 1.350 V 1
V
I
= 41.25V, I
L
= -5mA 1.2 1.350 V 1
V
I
= 41.25V, I
L
= -200mA 1.2 1.350 V 1
V
RLine
Line Regulation 4.25V ≤V
I
≤41.25V,
I
L
= -5mA
-25 25 mV 1
V
RLoad
Load Regulation V
I
= 6.25V,
-1.5A ≤I
L
≤-5mA
-7.0 7.0 mV 1
V
I
= 41.25V,
-200mA ≤I
L
≤-5mA
-7.0 7.0 mV 1
∆V
I
/∆V
O
Ripple Rejection V
I
= 6.25V, I
L
= -500mA
E
I
=1V
RMS
at f = 2400Hz
60 dB 4
V
O
(Recov) Output Voltage Recovery V
I
= 4.25V, R
L
= 0.833Ω,
C
L
= 20µS
1.20 1.350 V 1
V
I
= 40V, R
L
= 250Ω1.20 1.350 V 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 =(T
Jmax -T
A)/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, LCC, and ceramic SOIC packages, and 20W for the TO3 package."
Note 3: Human body model, 100 pF discharged through a 1.5 kΩresistor.
Note 4: For the Ceramic SOIC device to function properly, the “Output” and “Output/Sense” pins must be connected on the users printed circuit board.
Note 5: The package material for these devices allows much improved heat transfer over our standard ceramic packages. In order to take full advantage of this
improved heat transfer, heat sinking must be provided between the package base (directly beneath the die), and either metal traces on, or thermal vias through, the
printed circuit board. Without this additional heat sinking, device power dissipation must be calculated using θJA, rather than θJC, thermal resistance. It must not be
assumed that the device leads will provide substantial heat transfer out the package, since the thermal resistance of the leadframe material is very poor, relative to
the material of the package base. The stated θJC thermal resistance is for the package material only, and does not account for the additional thermal resistance
between the package base and the printed circuit board. The user must determine the value of the additional thermal resistance and must combine this with the
stated value for the package, to calculate the total allowed power dissipation for the device.
Note 6: Guaranteed parameter, not tested.
Note 7: Tested @25˚C; guaranteed, but not tested @125˚C & −55˚C
Note 8: Tested @TA= 125˚C, correlated to TA= 150˚C
Note 9: SMD limit of 6mV/V is equivalent to 18mV
Note 10: SMD limit of 0.3mV/V is equivalent to 120mV
Note 11: Pre and post irradiation limits are identical to those listed under AC and DC electrical characteristics except as listed in the “Post Radiation Limits” table.
These parts may be dose rate sensitive in a space environment and demonstrate enhanced low dose rate effect. Radiation end point limits for the noted parameters
are guaranteed only for the conditions as specified in Mil-Std-883, Method 1019.5, Condition A.
Note 12: Low dose rate testing has been performed on a wafer-by-wafer basis, per test method 1019 condition D of MIL-STD-883, with no enhanced low dose rate
sensitivity (ELDRS) effect.
LM117QML
www.national.com11
Typical Performance Characteristics Output Capacitor = 0µF unless otherwise noted
Load Regulation Current Limit
20143637 20143638
Adjustment Current Dropout Voltage
20143639 20143640
Temperature Stability Minimum Operating Current
20143641 20143642
LM117QML
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Typical Performance Characteristics Output Capacitor = 0µF unless otherwise noted (Continued)
Ripple Rejection Ripple Rejection
20143643 20143644
Ripple Rejection Output Impedance
20143645 20143646
Line Transient Response Load Transient Response
20143647 20143648
LM117QML
www.national.com13
Application Hints
In operation, the LM117 develops a nominal 1.25V reference
voltage, V
REF
, between the output and adjustment terminal.
The reference voltage is impressed across program resistor
R1 and, since the voltage is constant, a constant current I
1
then flows through the output set resistor R2, giving an
output voltage of
Since the 100µA current from the adjustment terminal repre-
sents an error term, the LM117 was designed to minimize
I
ADJ
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.
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 rejec-
tion 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 some-
times 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 tanta-
lum. 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
can cause excessive ringing. This occurs with values be-
tween 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.
LOAD REGULATION
The LM117 is capable of providing extremely good load
regulation but a few precautions are needed to obtain maxi-
mum performance. The current set resistor connected be-
tween the adjustment terminal and the output terminal (usu-
ally 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
0.05Ωresistance between the regulator and load will have a
load regulation due to line resistance of 0.05ΩxI
L
. If the set
resistor is connected near the load the effective line resis-
tance will be 0.05Ω(1 + R2/R1) or in this case, 11.5 times
worse.
Figure 2 shows the effect of resistance between the regula-
tor and 240Ωset resistor.
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 V
IN
. 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 dis-
charge through a low current junction. Discharge occurs
20143605
FIGURE 1.
20143606
FIGURE 2. Regulator with Line Resistance in Output
Lead
LM117QML
www.national.com 14
Application Hints (Continued)
when either the input or output is shorted. Internal to the
LM117 is a 50Ωresistor 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.
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.
Typical Applications
5V Logic Regulator with Electronic Shutdown* Slow Turn-On 15V Regulator
20143603
*Min. output )1.2V
20143609
Adjustable Regulator with Improved Ripple Rejection
20143610
†Solid tantalum
*Discharges C1 if output is shorted to ground
20143607
D1 protects against C1
D2 protects against C2
FIGURE 3. Regulator with Protection Diodes
LM117QML
www.national.com15
Typical Applications (Continued)
High Stability 10V Regulator
20143611
High Current Adjustable Regulator
20143612
‡Optional — improves ripple rejection
†Solid tantalum
*Minimum load current = 30 mA
LM117QML
www.national.com 16
Typical Applications (Continued)
0 to 30V Regulator
20143613
Full output current not available at high input-output voltages
Power Follower
20143614
5A Constant Voltage/Constant Current Regulator
20143615
†Solid tantalum
*Lights in constant current mode
LM117QML
www.national.com17
Typical Applications (Continued)
1A Current Regulator
20143616
1.2V–20V Regulator with Minimum Program Current
20143617
*Minimum load current )4mA
High Gain Amplifier
20143618
Low Cost 3A Switching Regulator
20143619
†Solid tantalum
*Core — Arnold A-254168-2 60 turns
LM117QML
www.national.com 18
Typical Applications (Continued)
4A Switching Regulator with Overload Protection
20143620
†Solid tantalum
*Core — Arnold A-254168-2 60 turns
Precision Current Limiter
20143621
Tracking Preregulator
20143622
LM117QML
www.national.com19
Typical Applications (Continued)
Current Limited Voltage Regulator
20143623
(Compared to LM117’s higher current limit)
— At 50 mA output only
3
⁄
4
volt of drop occurs in R3and R4
Adjusting Multiple On-Card Regulators with Single Control*
20143624
*All outputs within ±100 mV
†Minimum load — 10 mA
LM117QML
www.national.com 20
Typical Applications (Continued)
AC Voltage Regulator
20143625
12V Battery Charger
20143626
Use of RSallows low charging rates with fully charged battery.
50mA Constant Current Battery Charger
20143627
LM117QML
www.national.com21
Typical Applications (Continued)
Adjustable 4A Regulator
20143628
1.2V–25V Adjustable Regulator
20143601
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.
Current Limited 6V Charger
20143629
*Sets peak current (0.6A for 1Ω)
**The 1000µF is recommended to filter out input transients
Digitally Selected Outputs
20143602
*Sets maximum VOUT
LM117QML
www.national.com 22
Revision History
Date
Released Revision Section Originator Changes
03/17/06 A New Release to corporate format L.Lytle
5 MDS data sheets were consolidated into
one corporate data sheet format. Clarified
∆I
Adj
/ Line versus ∆I
Adj
/ Load by
separating the parameters in all of the
tables. MNLM117–K Rev 1C1,
MNLM117–X Rev 0A0, MNLM117–E Rev
0B1, MRLM117–X-RH Rev 2A0,
MRLM117–K-RH Rev 3A0 will be
archived.
06/29/06 B Features, Ordering Information
Table, Rad Hard Electrical Section
for H and WG packages and Notes
R. Malone Deleted NSID LM117WGRQML, no longer
available. Added Available with Radiation
Guarantee, Low Dose NSID’s to table
5962R9951705VXA LM117HRLQMLV,
5962R9951705VZA LM117WGRLQMLV,
and reference to Note 11 and 12. Note 12
to Rad Hard Electrical Heading for H and
WG packages. Note 12 to Notes. Archive
Revision A.
LM117QML
www.national.com23
Physical Dimensions inches (millimeters) unless otherwise noted
(TO-39) Metal Can Package
NS Package Number H03A
TO-3 Metal Can Package (K)
NS Package Number K02C
LM117QML
www.national.com 24
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
Ceramic Leadless Chip Carrier
NS Package Number E20A
Ceramic SOIC
NS Package Number WG16A
LM117QML
www.national.com25
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.
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS
WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR
CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body, or
(b) support or sustain life, and whose failure to perform when
properly used in accordance with instructions for use
provided in the labeling, can be reasonably expected to result
in a significant injury to the user.
2. A critical component is any component of a life support
device or system whose failure to perform can be reasonably
expected to cause the failure of the life support device or
system, or to affect its safety or effectiveness.
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National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C2) and Banned Substances
and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at:
www.national.com/quality/green.
Lead free products are RoHS compliant.
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www.national.com
LM117QML 3-Terminal Adjustable Regulator
