LM79M15CMDC [TI]
IC,VOLT REGULATOR,FIXED,-15V,BIPOLAR,DIE;
| 型号： | LM79M15CMDC |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | IC,VOLT REGULATOR,FIXED,-15V,BIPOLAR,DIE |
| 文件： | 总9页 (文件大小：238K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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September 2001
LM79MXX Series
3-Terminal Negative Regulators
a resistor divider. The low quiescent current of these devices
with a specified maximum change with line and load ensures
good regulation in the voltage boosted mode.
General Description
The LM79MXX series of 3-terminal regulators is available
with fixed output voltages of −5V, −12V, and −15V. These
devices need only one external component—a compensa-
tion capacitor at the output. The LM79MXX series is pack-
aged in the TO-220 power package, and is capable of sup-
plying 0.5A of output current.
For output voltage other than −5V, −12V, and −15V the
LM137 series provides an output voltage range from −1.2V
to −57V.
Features
n Thermal, short circuit and safe area protection
n High ripple rejection
These regulators employ internal current limiting, safe area
protection, and thermal shutdown for protection against vir-
tually all overload conditions.
n 0.5A output current
n 4% tolerance on preset output voltage
Low ground pin current of the LM79MXX series allows out-
put voltage to be easily boosted above the preset value with
Connection Diagram
TO-220 Plastic Package (T)
DS010483-7
Front View
Order Number LM79M05CT, LM79M12CT or LM79M15CT
See NS Package Number T03B
© 2001 National Semiconductor Corporation
DS010483
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.
Power Dissipation (Note 2)
Internally Limited
Operating Junction
Temperature Range
0˚C to +125˚C
Input Voltage
Storage Temperature Range
−65˚C to +150˚C
VO = −5V
−25V
−35V
Lead Temperature
(Soldering, 10 sec.)
VO = −12V, −15V
230˚C
TBD
Input/Output Differential
VO = −5V
VO = −12V, −15V
ESD Susceptibility
25V
30V
Electrical Characteristics LM79M05C
Conditions unless otherwise noted: IOUT = 350mA, CIN = 2.2µF, COUT = 1µF, 0˚C ≤ TJ ≤ +125˚C
Part Number
LM79M05C
Output Voltage
−5V
−10V
Typ
Units
Input Voltage (Unless Otherwise Specified)
Symbol
Parameter
Output Voltage
Conditions
TJ = 25˚C
Min
−4.8
Max
VO
−5.0
−5.2
V
V
5mA ≤ IOUT ≤ 350mA
−4.75
−5.25
(−25 ≤ VIN ≤ −7)
∆VO
∆VO
Line Regulation
TJ = 25˚C (Note 3)
8
50
30
mV
mV
mV
(−25 ≤ VIN ≤ −7)
2
(−18 ≤ VIN ≤ − 8)
30
Load Regulation
TJ = 25˚C, (Note 3)
5mA ≤ IOUT ≤ 0.5A
TJ = 25˚C
100
IQ
Quiescent Current
Quiescent Current
Change
1
2
mA
mA
∆IQ
With Input Voltage
0.4
(−25 ≤ VIN ≤ −8)
With Load,
5mA ≤ IOUT ≤ 350mA
TA = 25˚C,
0.4
mA
µV
Vn
Output Noise Voltage
Ripple Rejection
150
10Hz ≤ f ≤ 100Hz
f = 120Hz
54
66
dB
(−18 ≤ VIN ≤ −8)
Dropout Voltage
Peak Output Current
Average Temperature
Coefficient of
TJ = 25˚C, IOUT = 0.5A
TJ = 25˚C
1.1
V
IOMAX
800
mA
IOUT = 5mA,
0˚C ≤ TJ ≤ 100˚C
−0.4
mV/˚C
Output Voltage
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2
Electrical Characteristics LM79M12C, LM79M15C
Conditions unless otherwise noted: IOUT = 350mA, CIN = 2.2µF, COUT = 1 µF, 0˚C ≤ TJ ≤ +125˚C
Part Number
LM79M12C
−12V
LM79M15C
−15V
Output Voltage
Units
Input Voltage (Unless Otherwise Specified)
−19V
−23V
Symbol
Parameter
Conditions
TJ = 25˚C
Min
Typ
Max
−12.5
−12.6
Min
Typ
Max
−15.6
−15.75
VO
Output Voltage
−11.5
−11.4
−12.0
−14.4
−14.25
−15.0
V
V
5 mA ≤ IOUT ≤ 350mA
(−27 ≤ VIN ≤ −14.5)
(−30 ≤ VIN ≤ −10.5)
∆VO
∆VO
Line Regulation
TJ = 25˚C (Note 3)
5
80
5
80
mV
mV
mV
(−30 ≤ VIN ≤ −14.5)
(−30 ≤ VIN ≤−17.5)
3
50
3
50
(−25 ≤ VIN ≤ − 15)
(−28 ≤ VIN ≤ −18)
Load Regulation
TJ = 25˚C, (Note 3)
5mA ≤ IOUT ≤ 0.5A
TJ = 25˚C
30
240
30
240
IQ
Quiescent Current
Quiescent Current
Change
1.5
3
1.5
3
mA
mA
∆IQ
With Input Voltage
0.4
0.4
(−30 ≤ VIN ≤ −14.5)
(−30 ≤ VIN ≤ −27)
With Load,
5mA ≤ IOUT ≤ 350mA
TA = 25˚C,
0.4
0.4
mA
µV
Vn
Output Noise
Voltage
400
400
70
10Hz ≤ f ≤ 100Hz
f = 120Hz
Ripple Rejection
54
70
54
dB
(−25 ≤ VIN ≤ −15)
(−30 ≤ VIN ≤ −17.5)
Dropout Voltage
TJ = 25˚C, IOUT = 0.5A
TJ = 25˚C
1.1
1.1
V
IOMAX
Peak Output
Current
800
800
mA
Average Temperature IOUT = 5mA,
Coefficient of
0˚C ≤ TJ ≤ 100˚C
−0.8
−1.0
mV/˚C
Output Voltage
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics.
Note 2: Refer to Typical Performance Characteristics and Design Considerations for details.
Note 3: Regulation is measued at a constant junction temperature by pulse testing with a low duty cycle. Changes in output voltage due to heating effects must be
taken into account.
Typical Performance Characteristics
Output Voltage vs. Temperature
Ripple Rejection
DS010483-11
DS010483-12
3
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Typical Performance Characteristics (Continued)
Output Impedance
Minimum Input-Output
Differential
DS010483-13
DS010483-14
Quiescent Current vs. Input Voltage
Quiescent Current vs. Load Current
DS010483-16
DS010483-15
Short-Circuit Current
Maximum Average Power
Dissipation (TO-220)
DS010483-17
DS010483-18
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4
Schematic Diagrams
−5V
DS010483-8
−12V and −15V
DS010483-9
5
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Design Considerations
Typical Applications
The LM79MXX fixed voltage regulator series have
thermal-overload protection from excessive power, internal
short-circuit protection which limits the circuit’s maximum
current, and output transistor safe-area compensation for
reducing the output current as the voltage across the pass
transistor is increased.
Bypass capacitors are necessary for stable operation of the
LM79MXX series of regulators over the input voltage and
output current ranges. Output bypass capacitors will improve
the transient response of the regulator.
The bypass capacitors (2.2µF on the input, 1.0µF on the
output), should be ceramic or solid tantalum which have
good high frequency characteristics. If aluminum electrolyt-
ics are used, their values should be 10µF or larger. The
bypass capacitors should be mounted with the shortest
leads, and if possible, directly across the regulator terminals.
Although the internal power dissipation is limited, the junc-
tion temperature must be kept below the maximum specified
temperature in order to meet data sheet specifications. To
calculate the maximum junction temperature or heat sink
required, the following thermal resistance values should be
used:
Fixed Regulator
Package
θJC
(˚C/W)
3
θJA
(˚C/W)
40
TO-220
DS010483-2
*
Required if regulator is separated from filter capacitor by more than 3".
For value given, capacitor must be solid tantalum. 25µF aluminum
electrolytic may be substituted.
(1)
†
Required for stability. For value given, capacitor must be solid tantalum.
25µF aluminum electrolytic may be substituted. Values given may be
increased without limit.
θCA = θCS+θSA
Solving for TJ:
For output capacitance in excess of 100µF, a high current diode from input
to output (1N4001, etc.) will protect the regulator from momentary input
shorts.
TJ = TA+ PD (θJC+θCA) or
= TA=+ PDθJA(Without a Heat Sink)
Where
Variable Output
TJ
= Junction Temperature
= Ambient Temperature
TA
PD = Power Dissipation
θJC = Junction-to-Case Thermal Resistance
θCA = Case-to-Ambient Thermal Resistance
θCS = Case-to-Heat Sink Thermal Resistance
θSA = Heat Sink-to-Ambient Thermal Resistance
θJA = Junction-to-Ambient Thermal Resistance
DS010483-3
*Improves transient response and ripple rejection.
Do not increase beyond 50µF.
Select R2 as follows:
LM79M05C
LM79M12C
LM79M15C
300Ω
750Ω
1k
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6
Typical Applications (Continued)
±
15V, 1 Amp Tracking Regulators
DS010483-1
*
Resistor tolerance of R4 and R5 determine matching of (+) and (−) outputs.
**
Necessary only if raw supply filter capacitors are more than 3" from regulators.
Performance (Typical)
(−15)
40mV
(+15)
2 mV
Load Regulation at 0.5A
Output Ripple, CIN = 3000µF, IL = 0.5A
Temperature Stability
100 µVrms
50mV
100 µVrms
50mV
Output Noise 10Hz ≤ f ≤ 10kHz
150 µVrms
150 µVrms
Dual Trimmed Supply
DS010483-4
7
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Physical Dimensions inches (millimeters) unless otherwise noted
TO-220 Plastic Package (T)
Order Number LM79M05CT, LM79M12CT or LM79M15CT
NS Package Number T03B
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 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.
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