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LM2930 3-Terminal Positive Regulator
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
n
Input-output differential less than 0.6V
n
Output current in excess of 150 mA
n
Reverse battery protection
n
40V load dump protection
n
Internal short circuit current limit
n
Internal thermal overload protection
n
Mirror-image insertion protection
n
P
+
Product Enhancement tested
Voltage Range
j
LM2930T-5.0:
5V
j
LM2930T-8.0:
8V
j
LM2930S-5.0:
5V
j
LM2930S-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-T
erminal
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
40C to +85C
Maximum Junction Temperature
125C
Storage Temperature Range
65C to +150C
Lead Temp. (Soldering, 10 seconds)
230C
Electrical Characteristics
(Note 3)
LM2930-5.0 V
IN
=14V, I
O
=150 mA, T
j
=25C (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 mAI
O
150 mA
5.5
V
MAX
40C
T
J
125C
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
& 10 mA
rms
, 100 Hz10 kHz
200
m Quiescent Current
I
O
=10 mA
4
7
mA
MAX
I
O
=150 mA
18
40
mA
MAX
Output Noise Voltage
10 Hz100 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
=100 5.5
V
MAX
Transient Conditions
0.3
V
MIN
Electrical Characteristics
(Note 3)
LM2930-8.0 (V
IN
=14V, I
O
=150 mA, T
j
=25C (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 mAI
O
150 mA,
8.8
V
MAX
40C
T
J
125C
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
& 10 mA
rms
, 100 Hz10 kHz
300
m Quiescent Current
I
O
=10 mA
4
7
mA
MAX
I
O
=150 mA
18
40
mA
MAX
Output Noise Voltage
10 Hz100 kHz
170
µV
rms
Long Term Stability
30
mV/1000 hr
Ripple Rejection
f
O
=120 Hz
52
dB
LM2930
www.national.com
2 Electrical Characteristics
(Note 3) (Continued)
LM2930-8.0 (V
IN
=14V, I
O
=150 mA, T
j
=25C (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
=100 8.8
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 3C/W and for case to ambient temperature is 50C/W for the TO-220, 73C/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, JA
is 50C/W; with 1 square inch of copper area, JA
is 37C/W; and with 1.6 or more square inches of copper area, JA
is 32C/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 (t
W
10 ms, duty cycle5%). 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.
**C
OUT
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 1
over the expected operating temperature range.
Typical Performance Characteristics
Output Impedance
Overvoltage Supply Current
00553911
00553912
LM2930
www.national.com
3 Typical Performance Characteristics
(Continued)
Reverse Supply Current
Output at Reverse
Supply
00553913
00553914
Output at Overvoltage
Output Voltage (Normalized
to 1V at T
j
=25C)
00553915
00553916
Dropout Voltage
Dropout Voltage
00553917
00553918
LM2930
www.national.com
4 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
www.national.com
5 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 r