LM79L05AC is OBSOLETE
LM79L05, LM79L12, LM79L12AC
LM79L15, LM79L15AC
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SNOSBR8K – JULY 1999 – REVISED APRIL 2013
LM79LXXAC Series 3-Terminal Negative Regulators
Check for Samples:
LM79L05, LM79L12, LM79L12AC, LM79L15, LM79L15AC
1
FEATURES
•
Preset Output Voltage Error is Less than ±5%
Over Load, Line and Temperature
Specified at an Output Current of 100mA
Easily Compensated with a Small 0.1μF Output
Capacitor
Internal Short-Circuit, Thermal and Safe
Operating Area Protection
Easily Adjustable to Higher Output Voltages
Maximum Line Regulation Less than 0.07%
V
OUT
/V
Maximum Load Regulation Less than 0.01%
V
OUT
/mA
See AN-1112 (SNVA009) for DSBGA
Considerations
DESCRIPTION
The LM79LXXAC series of 3-terminal negative
voltage regulators features fixed output voltages of
−5V, −12V,
and
−15V
with output current capabilities
in excess of 100mA. These devices were designed
using the latest computer techniques for optimizing
the packaged IC thermal/electrical performance. The
LM79LXXAC series, when combined with a minimum
output capacitor of 0.1μF, exhibits an excellent
transient response, a maximum line regulation of
0.07% V
O
/V, and a maximum load regulation of
0.01% V
O
/mA.
The LM79LXXAC series also includes, as self-
protection circuitry: safe operating area circuitry for
output transistor power dissipation limiting, a
temperature independent short circuit current limit for
peak output current limiting, and a thermal shutdown
circuit to prevent excessive junction temperature.
Although designed primarily as fixed voltage
regulators, these devices may be combined with
simple external circuitry for boosted and/or adjustable
voltages and currents. The LM79LXXAC series is
available in the 3-lead TO package, the 8-lead SOIC
package, and the 6-Bump DSBGA package.
For output voltages other than the pre-set -5V, -12V
and -15V, the LM137L series provides an adjustable
output voltage range from -1.2V to -47V.
2
•
•
•
•
•
•
•
Typical Applications
*Required if the regulator is located far from the power supply filter.
A 1μF aluminum electrolytic may be substituted.
**Required for stability. A 1μF aluminum electrolytic may be
substituted.
−V
0
=
−5V −
(5V/R1 + I
Q
) • R2,
5V/R1 > 3 I
Q
Figure 1. Fixed Output Regulator
Figure 2. Adjustable Output Regulator
1
2
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
Copyright © 1999–2013, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
LM79L05AC is OBSOLETE
LM79L05, LM79L12, LM79L12AC
LM79L15, LM79L15AC
SNOSBR8K – JULY 1999 – REVISED APRIL 2013
www.ti.com
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
Connection Diagram
-V
OUT
-V
IN
-V
IN
NC
1
2
3
4
8
7
6
5
NC
-V
IN
-V
IN
GND
Pins labeled 'NC' on LM79LXXACM 8-Lead SOIC (pin 4 and pin 8) are Open, no internal connection.
Figure 3. 8-Lead SOIC Narrow (D)
Top View
Figure 4. 3–Lead TO-226 (LP)
Bottom View
LM79LXXACM
GND
A2
B2
A1
B1
GND
-V
OUT
-V
IN
C2
C1
-V
OUT
-V
IN
Figure 5. 6-Bump DSBGA
Top View (Bump Side Down)
2
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Copyright © 1999–2013, Texas Instruments Incorporated
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LM79L05AC is OBSOLETE
LM79L05, LM79L12, LM79L12AC
LM79L15, LM79L15AC
www.ti.com
SNOSBR8K – JULY 1999 – REVISED APRIL 2013
Absolute Maximum Ratings
(1) (2)
Input Voltage
V
O
=
−5V, −12V, −15V
Internal Power Dissipation
(3)
−35V
Internally Limited
0°C to +70°C
+125°C
−55°C
to +150°C
260°C
Operating Temperature Range
Maximum Junction Temperature
Storage Temperature Range
Lead Temperature
(Soldering, 10 sec.)
(1)
(2)
(3)
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for
which the device is functional.
If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and
specifications.
Thermal resistance of TO-226 (LP) package is 60°C/W
θ
JC
, 232°C/W
θ
JA
at still air, and 88°C/W at 400 ft/min of air. The
θ
JA
of the
LM78LXX in the 6-Bump DSBGA package is 114°C/W when mounted on a 4-Layer JEDEC test board (JESD 51-7). The
θ
JA
of the
LM78LXX in the SOIC-8 (D) package is 180°C/W in still air. The maximum junction temperature shall not exceed 125°C on electrical
parameters.
(1)
Electrical Characteristics
Output Voltage
T
A
= 0°C to +70°C unless otherwise noted.
−5V
−10V
Min
−5.2
−5.25
Typ
−5
Max
−4.8
−4.75
Min
−12.5
−12.6
−12V
−17V
Typ
−12
Max
−11.5
−11.4
Min
−15.6
−15.7
5
−15.7
5
−15V
−20V
Typ
−15
Max
−14.4
−14.25
V
Units
Input Voltage (unless otherwise noted)
Symbol
Parameter
Conditions
T
J
= 25°C, I
O
= 100mA
1mA
≤
I
O
≤
100mA
V
O
Output
Voltage
V
MIN
≤
V
IN
≤
V
MAX
1mA
≤
I
O
≤
40mA
V
MIN
≤
V
IN
≤
V
MAX
T
J
= 25°C, I
O
= 100mA
ΔV
O
Line
Regulation
V
MIN
≤
V
IN
≤
V
MAX
T
J
= 25°C, I
O
= 40mA
V
MIN
≤
V
IN
≤
V
MAX
ΔV
O
ΔV
O
I
Q
Load
Regulation
Long Term
Stability
Quiescent
Current
Quiescent
Current
Change
Output Noise
Voltage
Ripple
Rejection
Input Voltage
Required to
Maintain Line
Regulation
(1)
T
J
= 25°C
1mA
≤
I
O
≤
100mA
I
O
= 100mA
I
O
= 100mA
1mA
≤
I
O
≤
100mA
ΔI
Q
1mA
≤
I
O
≤
40mA
I
O
= 100mA
V
MIN
≤
V
IN
≤
V
MAX
V
n
ΔV
IN
/ΔV
O
T
J
= 25°C, I
O
= 100mA
f = 10Hz
−
10kHz
T
J
= 25°C, I
O
= 100mA
f = 120Hz
T
J
= 25°C, I
O
= 100mA
I
O
= 40mA
50
−7.3
−7.0
20
2
6
0.3
0.1
0.25
(−20
≤
V
IN
≤ −7.5)
40
52
−14.6
−14.5
(−27
≤
V
IN
≤ −14.8)
96
50
−17.7
−17.5
48
2
6
0.3
0.1
0.25
(−30
≤
V
IN
≤ −18)
120
60
2
6
0.3
0.1
0.25
mA
mA
V
μV
dB
V
V
mV/kh
rs
mA
(−20
≤
V
IN
≤ −7)
50
(−20
≤
V
IN
≤ −7.5)
−5.25
(−20
≤
V
IN
≤ −7)
60
(−20
≤
V
IN
≤ −7.3)
60
−4.75
(−27
≤
V
IN
≤ −14.8)
−12.6
−11.4
(−30
≤
V
IN
≤ −18)
−14.25
(−27
≤
V
IN
≤ −14.5)
45
(−27
≤
V
IN
≤ −14.6)
45
(−27
≤
V
IN
≤ −14.5)
100
(−30
≤
V
IN
≤ −17.5)
45
(−30
≤
V
IN
≤ −17.7)
45
(−30
≤
V
IN
≤ −17.5)
125
mV
V
mV
V
mV
To ensure constant junction temperature, low duty cycle pulse testing is used.
Copyright © 1999–2013, Texas Instruments Incorporated
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LM79L05AC is OBSOLETE
LM79L05, LM79L12, LM79L12AC
LM79L15, LM79L15AC
SNOSBR8K – JULY 1999 – REVISED APRIL 2013
www.ti.com
Typical Performance Characteristics
Maximum Average Power Dissipation (TO-226)
Peak Output Current
Figure 6.
Short Circuit Output Current
Figure 7.
Dropout Voltage
Figure 8.
Figure 9.
Output Voltage vs. Temperature
(Normalized to 1V @ 25°C)
Ripple Rejection
Figure 10.
Figure 11.
4
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Copyright © 1999–2013, Texas Instruments Incorporated
Product Folder Links:
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