NSC LM79M05CP, LM79M05CMWC, LM79M05CMDC, LM79M05CH Datasheet
LM79MXX Series
3-Terminal Negative Regulators
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 compensation capacitor at the output. The LM79MXX series is packaged in the TO-220 power package, and is capable of supplying 0.5A of output current.
These regulators employ internal current limiting, safe area
protection, and thermal shutdown for protection against virtually all overload conditions.
Low ground pin current of the LM79MXX series allows output voltage to be easily boosted above the preset value with
a resistor divider.Thelowquiescentcurrent of these devices
with a specified maximum change with line and load ensures
good regulation in the voltage boosted mode.
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
n 0.5A output current
n 4% tolerance on preset output voltage
Connection Diagram
TO-220 Plastic Package (T)
DS010483-7
Front View
Order Number LM79M05CT, LM79M12CT or LM79M15CT
See NS Package Number T03B
September 2001
LM79MXX Series 3-Terminal Negative Regulators
© 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.
Input Voltage
V
O
= −5V −25V
V
O
= −12V, −15V −35V
Input/Output Differential
V
O
= −5V
V
O
= −12V, −15V
25V
30V
Power Dissipation (Note 2) Internally Limited
Operating Junction
Temperature Range 0˚C to +125˚C
Storage Temperature Range −65˚C to +150˚C
Lead Temperature
(Soldering, 10 sec.) 230˚C
ESD Susceptibility TBD
Electrical Characteristics LM79M05C
Conditions unless otherwise noted: I
OUT
= 350mA, CIN= 2.2µF, C
OUT
= 1µF, 0˚C ≤ TJ≤ +125˚C
Part Number LM79M05C
Output Voltage −5V Units
Input Voltage (Unless Otherwise Specified) −10V
Symbol Parameter Conditions Min Typ Max
V
O
Output Voltage TJ= 25˚C −4.8 −5.0 −5.2 V
5mA ≤ I
OUT
≤ 350mA −4.75 −5.25 V
(−25 ≤ V
IN
≤ −7)
∆V
O
Line Regulation TJ= 25˚C (Note 3) 8 50 mV
(−25 ≤ V
IN
≤ −7)
230mV
(−18 ≤ V
IN
≤ −8)
∆V
O
Load Regulation TJ= 25˚C, (Note 3) 30 100 mV
5mA ≤ I
OUT
≤ 0.5A
I
Q
Quiescent Current TJ= 25˚C 1 2 mA
∆I
Q
Quiescent Current With Input Voltage 0.4 mA
Change (−25 ≤ V
IN
≤ −8)
With Load,
5mA ≤ I
OUT
≤ 350mA 0.4 mA
V
n
Output Noise Voltage TA= 25˚C, 150 µV
10Hz ≤ f ≤ 100Hz
Ripple Rejection f = 120Hz 54 66 dB
(−18 ≤ V
IN
≤ −8)
Dropout Voltage T
J
= 25˚C, I
OUT
= 0.5A 1.1 V
I
OMAX
Peak Output Current TJ= 25˚C 800 mA
Average Temperature I
OUT
= 5mA,
Coefficient of 0˚C ≤ T
J
≤ 100˚C −0.4 mV/˚C
Output Voltage
LM79MXX Series
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Electrical Characteristics LM79M12C, LM79M15C
Conditions unless otherwise noted: I
OUT
= 350mA, CIN= 2.2µF, C
OUT
= 1 µF, 0˚C ≤ TJ≤ +125˚C
Part Number LM79M12C LM79M15C
Output Voltage −12V −15V Units
Input Voltage (Unless Otherwise Specified) −19V −23V
Symbol Parameter Conditions Min Typ Max Min Typ Max
V
O
Output Voltage TJ= 25˚C −11.5 −12.0 −12.5 −14.4 −15.0 −15.6 V
5mA≤I
OUT
≤ 350mA −11.4 −12.6 −14.25 −15.75 V
(−27 ≤ V
IN
≤ −14.5) (−30 ≤ VIN≤ −10.5)
∆V
O
Line Regulation TJ= 25˚C (Note 3) 5 80 5 80 mV
(−30 ≤ V
IN
≤ −14.5) (−30 ≤ VIN≤−17.5)
3 50 3 50 mV
(−25 ≤ V
IN
≤ − 15) (−28 ≤ VIN≤ −18)
∆V
O
Load Regulation TJ= 25˚C, (Note 3) 30 240 30 240 mV
5mA ≤ I
OUT
≤ 0.5A
I
Q
Quiescent Current TJ= 25˚C 1.5 3 1.5 3 mA
∆I
Q
Quiescent Current With Input Voltage 0.4 0.4 mA
Change (−30 ≤ V
IN
≤ −14.5) (−30 ≤ VIN≤ −27)
With Load,
5mA ≤ I
OUT
≤ 350mA 0.4 0.4 mA
V
n
Output Noise TA= 25˚C, 400 400 µV
Voltage 10Hz ≤ f ≤ 100Hz
Ripple Rejection f = 120Hz 54 70 54 70 dB
(−25 ≤ V
IN
≤ −15) (−30 ≤ VIN≤ −17.5)
Dropout Voltage T
J
= 25˚C, I
OUT
= 0.5A 1.1 1.1 V
I
OMAX
Peak Output
Current
TJ= 25˚C 800 800 mA
Average Temperature I
OUT
= 5mA,
Coefficient of 0˚C ≤ T
J
≤ 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 ata constant junction temperature bypulse testing with a lowduty cycle. Changes in output voltage due to heating effectsmust be
taken into account.
Typical Performance Characteristics
Output Voltage vs. Temperature
DS010483-11
Ripple Rejection
DS010483-12
LM79MXX Series
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