Positive Regulators. LM340A Datasheet

LM340A Datasheet PDF, Equivalent


Part Number

LM340A

Description

Series 3-Terminal Positive Regulators

Manufacture

National Semiconductor

Total Page 15 Pages
PDF Download
Download LM340A Datasheet PDF


LM340A Datasheet
May 1999
LM140/LM340A/LM340/LM7800C
Series 3-Terminal Positive Regulators
General Description
The LM140/LM340A/LM340/LM7800C monolithic 3-terminal
positive voltage regulators employ internal current-limiting,
thermal shutdown and safe-area compensation, making
them essentially indestructible. If adequate heat sinking is
provided, they can deliver over 1.0A output current. They are
intended as fixed voltage regulators in a wide range of appli-
cations including local (on-card) regulation for elimination of
noise and distribution problems associated with single-point
regulation. In addition to use as fixed voltage regulators,
these devices can be used with external components to ob-
tain adjustable output voltages and currents.
Considerable effort was expended to make the entire series
of regulators easy to use and minimize the number of exter-
nal components. It is not necessary to bypass the output, al-
though this does improve transient response. Input bypass-
ing is needed only if the regulator is located far from the filter
capacitor of the power supply.
The 5V, 12V, and 15V regulator options are available in the
steel TO-3 power package. The LM340A/LM340/LM7800C
series is available in the TO-220 plastic power package, and
the LM340-5.0 is available in the SOT-223 package, as well
as the LM340-5.0 and LM340-12 in the surface-mount
TO-263 package.
Features
n Complete specifications at 1A load
n Output voltage tolerances of ±2% at Tj = 25˚C and ±4%
over the temperature range (LM140A/LM340A)
n Line regulation of 0.01% of VOUT/V of VIN at 1A load
(LM140A/LM340A)
n Load regulation of 0.3% of VOUT/A (LM140A/LM340A)
n Internal thermal overload protection
n Internal short-circuit current limit
n Output transistor safe area protection
n P+ Product Enhancement tested
Device
Output
Voltages
LM140
5, 12,
15
LM340A/LM340 5, 12,
15
LM7800C
5, 8, 12,
15
Packages
TO-3 (K)
TO-3 (K), TO-220 (T),
SOT-223 (MP), TO-263 (S)
(5V and 12V only)
TO-220 (T)
Typical Applications
Fixed Output Regulator
Adjustable Output Regulator
DS007781-1
*Required if the regulator is located far from the power supply filter.
**Although no output capacitor is needed for stability, it does help transient
response. (If needed, use 0.1 µF, ceramic disc).
Current Regulator
DS007781-2
VOUT = 5V + (5V/R1 + IQ) R2 5V/R1 > 3 IQ,
load regulation (Lr) [(R1 + R2)/R1] (Lr of LM340-5).
Comparison between SOT-223 and D-Pak (TO-252)
Packages
DS007781-3
IQ = 1.3 mA over line and load changes.
DS007781-38
Scale 1:1
© 1999 National Semiconductor Corporation DS007781
www.national.com

LM340A Datasheet
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
(Note 5)
DC Input Voltage
All Devices except
LM7824/LM7824C
LM7824/LM7824C
Internal Power Dissipation (Note 2)
Maximum Junction Temperature
Storage Temperature Range
35V
40V
Internally Limited
150˚C
−65˚C to +150˚C
Lead Temperature (Soldering, 10 sec.)
TO-3 Package (K)
TO-220 Package (T), TO-263
Package (S)
ESD Susceptibility (Note 3)
300˚C
230˚C
2 kV
Operating Conditions (Note 1)
Temperature Range (TA) (Note 2)
LM140A, LM140
LM340A, LM340, LM7805C,
LM7812C, LM7815C, LM7808C
−55˚C to +125˚C
0˚C to +125˚C
LM340A
Electrical Characteristics
IOUT= 1A, −55˚C TJ+150˚C (LM140A), or 0˚C TJ+ 125˚C (LM340A) unless otherwise specified (Note 4)
Output Voltage
5V 12V
15V
Symbol
Input Voltage (unless otherwise noted)
10V 19V
23V
Parameter
Conditions
Min Typ Max Min Typ Max Min Typ Max
VO Output Voltage
VO Line Regulation
TJ = 25˚C
PD 15W, 5 mA IO 1A
VMIN VIN VMAX
IO = 500 mA
VIN
TJ = 25˚C
VIN
TJ = 25˚C
Over Temperature
4.9 5 5.1 11.75 12 12.25
4.8
5.2 11.5
12.5
(7.5 VIN 20) (14.8 VIN 27)
10 18
(7.5 VIN 20) (14.8 VIN 27)
3 10
4 18
(7.5 VIN 20) (14.5 VIN 27)
49
12 30
14.7 15 15.3
14.4 15.6
(17.9 VIN 30)
22
(17.9 VIN 30)
4 22
(17.5 VIN 30)
10
30
VO Load Regulation
VIN
TJ = 25˚C
5 mA IO 1.5A
250 mA IO 750 mA
Over Temperature,
(8 VIN 12)
10 25
15
25
(16 VIN 22)
12 32
19
60
(20 VIN 26)
12 35
21
75
5 mA IO 1A
IQ
Quiescent Current
TJ = 25˚C
Over Temperature
66
6.5 6.5
6
6.5
IQ
Quiescent Current
5 mA IO 1A
Change
TJ = 25˚C, IO = 1A
VMIN VIN VMAX
IO = 500 mA
VMIN VIN VMAX
VN Output Noise Voltage TA = 25˚C, 10 Hz f 100 kHz
Ripple Rejection
TJ = 25˚C, f = 120 Hz, IO = 1A
or f = 120 Hz, IO = 500 mA,
Over Temperature,
0.5
0.8
(7.5 VIN 20)
0.8
(8 VIN 25)
40
68 80
68
0.5
0.8
(14.8 VIN 27)
0.8
(15 VIN 30)
75
61 72
61
0.5
0.8
(17.9 VIN 30)
0.8
(17.9 VIN 30)
90
60 70
60
VMIN VIN VMAX
RO Dropout Voltage TJ = 25˚C, IO = 1A
Output Resistance
f = 1 kHz
(8 VIN 18)
2.0
8
(15 VIN 25)
2.0
18
(18.5 VIN 28.5)
2.0
19
Short-Circuit Current
TJ = 25˚C
Peak Output Current
TJ = 25˚C
Average TC of VO
Min, TJ = 0˚C, IO = 5 mA
VIN Input Voltage
TJ = 25˚C
Required to Maintain
2.1
2.4
−0.6
7.5
1.5
2.4
−1.5
14.5
1.2
2.4
−1.8
17.5
Line Regulation
Units
V
V
V
mV
V
mV
V
mV
mV
V
mV
mV
mV
mA
mA
mA
mA
V
mA
V
µV
dB
dB
V
V
m
A
A
mV/˚C
V
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2


Features Datasheet pdf LM140/LM340A/LM340/LM7800C Series 3-Term inal Positive Regulators May 1999 LM1 40/LM340A/LM340/LM7800C Series 3-Termin al Positive Regulators General Descript ion The LM140/LM340A/LM340/LM7800C mono lithic 3-terminal positive voltage regu lators employ internal current-limiting , thermal shutdown and safe-area compen sation, making them essentially indestr uctible. If adequate heat sinking is pr ovided, they can deliver over 1.0A outp ut current. They are intended as fixed voltage regulators in a wide range of a pplications including local (on-card) r egulation for elimination of noise and distribution problems associated with s ingle-point regulation. In addition to use as fixed voltage regulators, these devices can be used with external compo nents to obtain adjustable output volta ges and currents. Considerable effort w as expended to make the entire series o f regulators easy to use and minimize t he number of external components. It is not necessary to bypass the output, although this does improve.
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