LM2930
LM2930 3-Terminal Positive Regulator
Literature Number: SNVS745C
LM2930
3-Terminal Positive Regulator
General Description
The LM2930 3-terminal positive regulator features an ability
to source 150 mA of output current with an input-output
differential of 0.6V or less. Efficient use of low input voltages
obtained, for example, from an automotive battery during
cold crank conditions, allows 5V circuitry to be properly
powered with supply voltages as low as 5.6V. Familiar regu-
lator features such as current limit and thermal overload
protection are also provided.
Designed originally for automotive applications, the LM2930
and all regulated circuitry are protected from reverse battery
installations or 2 battery jumps. During line transients, such
as a load dump (40V) when the input voltage to the regulator
can momentarily exceed the specified maximum operating
voltage, the regulator will automatically shut down to protect
both internal circuits and the load. The LM2930 cannot be
harmed by temporary mirror-image insertion.
Fixed outputs of 5V and 8V are available in the plastic
TO-220 and TO-263 power packages.
Features
nInput-output differential less than 0.6V
nOutput current in excess of 150 mA
nReverse battery protection
n40V load dump protection
nInternal short circuit current limit
nInternal thermal overload protection
nMirror-image insertion protection
nP
+
Product Enhancement tested
Voltage Range
jLM2930T-5.0: 5V
jLM2930T-8.0: 8V
jLM2930S-5.0: 5V
jLM2930S-8.0: 8V
Connection Diagram
(TO-220)
Plastic Package
00553901
Front View
Order Number LM2930T-5.0 or LM2930T-8.0
See NS Package Number T03B
(TO-263)
Plastic Surface-Mount Package
00553907
Top View
00553908
Side View
Order Number LM2930S-5.0 or LM2930S-8.0
See NS Package Number TS3B
June 2005
LM2930 3-Terminal Positive Regulator
© 2005 National Semiconductor Corporation DS005539 www.national.com
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Input Voltage
Operating Range 26V
Overvoltage Protection 40V
Reverse Voltage (100 ms) −12V
Reverse Voltage (DC) −6V
Internal Power Dissipation (Note 2) Internally Limited
Operating Temperature Range −40˚C to +85˚C
Maximum Junction Temperature 125˚C
Storage Temperature Range −65˚C to +150˚C
Lead Temp. (Soldering, 10 seconds) 230˚C
Electrical Characteristics (Note 3)
LM2930-5.0 V
IN
=14V, I
O
=150 mA, T
j
=25˚C (Note 6), C2=10 µF, unless otherwise specified
Tested Design
Parameter Conditions Typ Limit Limit Unit
(Note 4) (Note 5)
Output Voltage 5 5.3 V
MAX
4.7 V
MIN
6V≤V
IN
≤26V, 5 mA≤I
O
≤150 mA 5.5 V
MAX
−40˚C≤T
J
≤125˚C 4.5 V
MIN
Line Regulation 9V≤V
IN
≤16V, I
O
=5 mA 7 25 mV
MAX
6V≤V
IN
≤26V, I
O
=5 mA 30 80 mV
MAX
Load Regulation 5 mA≤I
O
≤150 mA 14 50 mV
MAX
Output Impedance 100 mA
DC
&10mA
rms
, 100 Hz−10 kHz 200 mΩ
Quiescent Current I
O
=10 mA 4 7 mA
MAX
I
O
=150 mA 18 40 mA
MAX
Output Noise Voltage 10 Hz−100 kHz 140 µV
rms
Long Term Stability 20 mV/1000 hr
Ripple Rejection f
O
=120 Hz 56 dB
Current Limit 400 700 mA
MAX
150 mA
MIN
Dropout Voltage I
O
=150 mA 0.32 0.6 V
MAX
Output Voltage Under −12V≤V
IN
≤40V, R
L
=100Ω5.5 V
MAX
Transient Conditions −0.3 V
MIN
Electrical Characteristics (Note 3)
LM2930-8.0 (V
IN
=14V, I
O
=150 mA, T
j
=25˚C (Note 6), C2=10 µF, unless otherwise specified)
Tested Design
Parameter Conditions Typ Limit Limit Unit
(Note 4) (Note 5)
Output Voltage 8 8.5 V
MAX
7.5 V
MIN
9.4V≤V
IN
≤26V, 5 mA≤I
O
≤150 mA, 8.8 V
MAX
−40˚C≤T
J
≤125˚C 7.2 V
MIN
Line Regulation 9.4V≤V
IN
≤16V, I
O
=5 mA 12 50 mV
MAX
9.4V≤V
IN
≤26V, I
O
=5 mA 50 100 mV
MAX
Load Regulation 5 mA≤I
O
≤150 mA 25 50 mV
MAX
Output Impedance 100 mA
DC
&10mA
rms
, 100 Hz−10 kHz 300 mΩ
Quiescent Current I
O
=10 mA 4 7 mA
MAX
I
O
=150 mA 18 40 mA
MAX
Output Noise Voltage 10 Hz−100 kHz 170 µV
rms
Long Term Stability 30 mV/1000 hr
Ripple Rejection f
O
=120 Hz 52 dB
LM2930
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Electrical Characteristics (Note 3) (Continued)
LM2930-8.0 (V
IN
=14V, I
O
=150 mA, T
j
=25˚C (Note 6), C2=10 µF, unless otherwise specified)
Tested Design
Parameter Conditions Typ Limit Limit Unit
(Note 4) (Note 5)
Current Limit 400 700 mA
MAX
150 mA
MIN
Dropout Voltage I
O
=150 mA 0.32 0.6 V
MAX
Output Voltage Under −12V≤V
IN
≤40V, R
L
=100Ω8.8 V
MAX
Transient Conditions −0.3 V
MIN
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. Electrical Characteristics state DC and AC electrical specifications under particular test conditions which
guarantee specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not guaranteed for parameters where no limit
is given, however, the typical value is a good indication of device performance.
Note 2: Thermal resistance without a heat sink for junction to case temperature is 3˚C/W and for case to ambient temperature is 50˚C/W for the TO-220, 73˚C/W
for the TO-263. If the TO-263 package is used, the thermal resistance can be reduced by increasing the P.C. board copper area thermally connected to the package.
Using 0.5 square inches of copper area, θJA is 50˚C/W; with 1 square inch of copper area, θJA is 37˚C/W; and with 1.6 or more square inches of copper area, θJA
is 32˚C/W.
Note 3: All characteristics are measured with a capacitor across the input of 0.1 µF and a capacitor across the output of 10 µF. All characteristics except noise
voltage and ripple rejection ratio are measured using pulse techniques (tW≤10 ms, duty cycle≤5%). Output voltage changes due to changes in internal temperature
must be taken into account separately.
Note 4: Guaranteed and 100% production tested.
Note 5: Guaranteed (but not 100% production tested) over the operating temperature and input current ranges. These limits are not used to calculate outgoing
quality levels.
Note 6: To ensure constant junction temperature, low duty cycle pulse testing is used.
Typical Application
00553905
*Required if regulator is located far from power supply filter.
**COUT must be at least 10 µF to maintain stability. May be increased without bound to maintain regulation during transients. Locate as close as possible to the
regulator. This capacitor must be rated over the same operating temperature range as the regulator. The equivalent series resistance (ESR) of this capacitor
should be less than 1Ωover the expected operating temperature range.
Typical Performance Characteristics
Output Impedance Overvoltage Supply Current
00553911 00553912
LM2930
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Typical Performance Characteristics (Continued)
Reverse Supply Current
Output at Reverse
Supply
00553913 00553914
Output at Overvoltage
Output Voltage (Normalized
to 1V at T
j
=25˚C)
00553915 00553916
Dropout Voltage Dropout Voltage
00553917 00553918
LM2930
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Typical Performance Characteristics (Continued)
Low Voltage Behavior High Voltage Behavior
00553919 00553920
Line Transient Response Load Transient Response
00553921 00553922
Peak Output Current Quiescent Current
00553923 00553924
LM2930
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Typical Performance Characteristics (Continued)
Quiescent Current Quiescent Current
00553925 00553926
Ripple Rejection Ripple Rejection
00553927 00553928
Definition of Terms
Dropout Voltage: The input-output voltage differential at
which the circuit ceases to regulate against further reduction
in input voltage. Measured when the output voltage has
dropped 100 mV from the nominal value obtained at 14V
input, dropout voltage is dependent upon load current and
junction temperature.
Input Voltage: The DC voltage applied to the input terminals
with respect to ground.
Input-Output Differential: The voltage difference between
the unregulated input voltage and the regulated output volt-
age for which the regulator will operate.
Line Regulation: The change in output voltage for a change
in the input voltage. The measurement is made under con-
ditions of low dissipation or by using pulse techniques such
that the average chip temperature is not significantly af-
fected.
Load Regulation: The change in output voltage for a
change in load current at constant chip temperature.
Long Term Stability: Output voltage stability under accel-
erated life-test conditions after 1000 hours with maximum
rated voltage and junction temperature.
Output Noise Voltage: The rms AC voltage at the output,
with constant load and no input ripple, measured over a
specified frequency range.
Quiescent Current: That part of the positive input current
that does not contribute to the positive load current. The
regulator ground lead current.
Ripple Rejection: The ratio of the peak-to-peak input ripple
voltage to the peak-to-peak output ripple voltage.
Temperature Stability of V
O
:The percentage change in
output voltage for a thermal variation from room temperature
to either temperature extreme.
LM2930
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Schematic Diagram
00553910
LM2930
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Physical Dimensions inches (millimeters)
unless otherwise noted
TO-220 3-Lead Molded Package
Order Number LM2930T-5.0 or LM2930T-8.0
NS Package Number T03B
LM2930
www.national.com9
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
TO-263 3-Lead Plastic Surface Mount Package
Order Number LM2930S-5.0 or LM2930S-8.0
NS Package Number TS3B
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.national.com
LM2930 3-Terminal Positive Regulator
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