LM320L/LM79LXXAC Series
3-Terminal Negative Regulators
General Description
The LM320L/LM79LXXAC dual marked 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,
even when combined with a minimum output compensation
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 LM320L/LM79LXXAC series also includes, as self-
protection circuitry: safe operating area circuitry for output
transistor power dissipation limiting, a temperature indepen-
dent 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-92 package, 8-lead SOIC package, and the 6-Bump
micro SMD package. The LM320L series is available in the
3-lead TO-92 package.
For output voltage other than −5V, −12V and −15V, the
LM137L series provides an output voltage range from 1.2V
to 47V.
Features
nPreset output voltage error is less than ±5% overload,
line and temperature
nSpecified at an output current of 100mA
nEasily compensated with a small 0.1µF output
capacitor
nInternal short-circuit, thermal and safe operating area
protection
nEasily adjustable to higher output voltages
nMaximum line regulation less than 0.07% V
OUT
/V
nMaximum load regulation less than 0.01% V
OUT
/mA
nSee AN-1112 for micro SMD considerations
Typical Applications
Fixed Output Regulator
00774801
*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.
Adjustable Output Regulator
00774803
−V0= −5V − (5V/R1 + IQ)•R2,
5V/R1 >3I
Q
Connection Diagrams
6-Bump micro SMD
00774820
Bump Side Down
TO-92 Plastic Package (Z)
00774802
Bottom View
March 2006
LM320L/LM79LXXAC Series 3-Terminal Negative Regulators
© 2006 National Semiconductor Corporation DS007748 www.national.com
Connection Diagrams (Continued)
SO-8 Plastic (Narrow Body)
00774804
Top View
Ordering Information
Package Part Number Package Marking Transport Media NSC Drawing
8-Lead SOIC LM79L05ACM LM79L05ACM 95 Units/Rail M08A
LM79L05ACMX 2.5k Units Tape and Reel
LM79L12ACM LM79L12ACM 95 Units/Rail
LM79L12ACMX 2.5k Units Tape and Reel
LM79L15ACM LM79L15ACM 95 Units/Rail
LM79L15ACMX 2.5k Units Tape and Reel
3-Pin TO-92 LM79L05ACZ 320L79L05 1800 Units Per Box Z03A
LM79L12ACZ 320L79L12 1800 Units Per Box
LM79L15ACZ 320L79L15 1800 Units Per Box
6-Bump
micro SMD
LM79L15ACTL XTPB 250 Units Tape and Reel TLA06AMA
LM79L05ACTLX 3k Units Tape and Reel
LM320L/LM79LXXAC
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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
V
O
= −5V, −12V, −15V −35V
Internal Power Dissipation (Note 2) Internally Limited
Operating Temperature Range 0˚C to +70˚C
Maximum Junction Temperature +125˚C
Storage Temperature Range −55˚C to +150˚C
Lead Temperature
(Soldering, 10 sec.) 260˚C
Electrical Characteristics (Note 3)
T
A
= 0˚C to +70˚C unless otherwise noted.
Output Voltage −5V −12V −15V
Input Voltage (unless otherwise noted) −10V −17V −20V Units
Symbol Parameter Conditions Min Typ Max Min Typ Max Min Typ Max
V
O
Output
Voltage
T
J
= 25˚C, I
O
= 100mA −5.2 −5 −4.8 −12.5 −12 −11.5 −15.6 −15 −14.4
1mA ≤I
O
≤100mA −5.25 −4.75 −12.6 −11.4 −15.75 −14.25
V
MIN
≤V
IN
≤V
MAX
(−20 ≤V
IN
≤−7.5) (−27 ≤V
IN
≤−14.8) (−30 ≤V
IN
≤−18) V
1mA ≤I
O
≤40mA −5.25 −4.75 −12.6 −11.4 −15.75 −14.25
V
MIN
≤V
IN
≤V
MAX
(−20 ≤V
IN
≤−7) (−27 ≤V
IN
≤−14.5) (−30 ≤V
IN
≤−17.5)
∆V
O
Line
Regulation
T
J
= 25˚C, I
O
= 100mA 60 45 45 mV
V
MIN
≤V
IN
≤V
MAX
(−20 ≤V
IN
≤−7.3) (−27 ≤V
IN
≤−14.6) (−30 ≤V
IN
≤−17.7) V
T
J
= 25˚C, I
O
= 40mA 60 45 45 mV
V
MIN
≤V
IN
≤V
MAX
(−20 ≤V
IN
≤−7) (−27 ≤V
IN
≤−14.5) (−30 ≤V
IN
≤−17.5) V
∆V
O
Load
Regulation
T
J
= 25˚C 50 100 125 mV
1mA ≤I
O
≤100mA
∆V
O
Long Term
Stability
I
O
= 100mA 20 48 60 mV/khrs
I
Q
Quiescent
Current
I
O
= 100mA 2 6 2 6 2 6 mA
∆I
Q
Quiescent
Current
1mA ≤I
O
≤100mA 0.3 0.3 0.3
Change 1mA ≤I
O
≤40mA 0.1 0.1 0.1 mA
I
O
= 100mA 0.25 0.25 0.25 mA
V
MIN
≤V
IN
≤V
MAX
(−20 ≤V
IN
≤−7.5) (−27 ≤V
IN
≤−14.8) (−30 ≤V
IN
≤−18) V
V
n
Output Noise
Voltage
T
J
= 25˚C, I
O
= 100mA 40 96 120 µV
f = 10Hz − 10kHz
Ripple
Rejection
T
J
= 25˚C, I
O
= 100mA 50 52 50 dB
f = 120Hz
Input Voltage T
J
= 25˚C, I
O
= 100mA −7.3 −14.6 −17.7 V
Required to I
O
= 40mA −7.0 −14.5 −17.5 V
Maintain Line
Regulation
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.
Note 2: Thermal resistance of Z package is 60˚C/W θJC, 232˚C/W θJA at still air, and 88˚C/W at 400 ft/min of air. The M package θJA is 180˚C/W in still air. The
maximum junction temperature shall not exceed 125˚C on electrical parameters.
Note 3: To ensure constant junction temperature, low duty cycle pulse testing is used.
LM320L/LM79LXXAC
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Typical Performance Characteristics
Maximum Average Power Dissipation (TO-92) Peak Output Current
00774811 00774812
Short Circuit Output Current Dropout Voltage
00774813 00774814
Ripple Rejection
Output Voltage vs. Temperature
(Normalized to 1V @25˚C)
00774815 00774816
LM320L/LM79LXXAC
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Typical Performance Characteristics (Continued)
Quiescent Current Output Impedance
00774817 00774818
Typical Applications
±15V, 100mA Dual Power Supply
00774806
LM320L/LM79LXXAC
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Schematic Diagrams
−5V
00774809
−12V and −15V
00774810
LM320L/LM79LXXAC
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Physical Dimensions inches (millimeters) unless otherwise noted
SOIC Package (M)
NS Package Number M08A
Molded Offset TO-92 (Z)
NS Package Number Z03A
LM320L/LM79LXXAC
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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
NOTES: UNLESS OTHERWISE SPECIFIED
1. EPOXY COATING.
2. 63Sn/67Pb EUTECTIC BUMP.
3. RECOMMEND NON-SOLDER MASK DEFINED LANDING PAD.
4. PIN A1 ESTABLISHED BY LOWER LEFT CORNER WITH RESPECT TO TEXT ORIENTATION.
5. XXX IN DRAWING NUMBER REPRESENTS PACKAGE SIZE VARIATION WHERE X1 IS PACKAGE WIDTH, X2 IS PACKAGE LENGTH AND X3 IS
PACKAGE HEIGHT.
6. REFERENCE JEEC REGISTRATION MO-211, VARIATION BC.
6-Bump micro SMD
NS Package Number TLA06AMA
X
1
= 1006µm X
2
= 1793µm X
3
= 600µm
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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LM320L/LM79LXXAC Series 3-Terminal Negative Regulators
