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LM320 Datasheet Preview

LM320 Datasheet

3-Terminal Negative Regulators

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LM120, LM320-N
www.ti.com
SNVS756C – APRIL 1998 – REVISED APRIL 2013
LM120/LM320-N Series 3-Terminal Negative Regulators
Check for Samples: LM120, LM320-N
FEATURES
1
2 Preset Output Voltage Error Less than ±3%
• Preset Current Limit
• Internal Thermal Shutdown
• Operates with Input-Output Voltage Differential
down to 1V
• Excellent Ripple Rejection
• Low Temperature Drift
• Easily Adjustable to Higher Output Voltage
DESCRIPTION
The LM120 series are three-terminal negative
regulators with a fixed output voltage of 5V, 12V,
and 15V, and up to 1.5A load current capability.
Where other voltages are required, the LM137 and
LM137HV series provide an output voltage range of
1.2V to 47V.
The LM120 need only one external component—a
compensation capacitor at the output, making them
easy to apply. Worst case specifications on output
voltage deviation due to any combination of line, load
or temperature variation assure satisfactory system
operation.
Exceptional effort has been made to make the LM120
Series immune to overload conditions. The regulators
have current limiting which is independent of
temperature, combined with thermal overload
protection. Internal current limiting protects against
momentary faults while thermal shutdown prevents
junction temperatures from exceeding safe limits
during prolonged overloads.
Although primarily intended for fixed output voltage
applications, the LM120 Series may be programmed
for higher output voltages with a simple resistive
divider. The low quiescent drain current of the
devices allows this technique to be used with good
regulation.
Table 1. LM120 Series Packages and Power
Capability
Device
Package
Rated Power
Dissipation
LM120/LM320-
N
LM320-N
TO-3 (NDS)
TO (NDT)
TO-220 (NDE)
20W
2W
15W
Design
Load
Current
1.5A
0.5A
1.5A
Typical Applications
Figure 1. Dual Trimmed Supply
*Required if regulator is separated from
filter capacitor by more than 3 inches. For
value given, capacitor must be solid
tantalum. 25 μF aluminum electrolytic may
be substituted.
†Required for stability. For value given,
capacitor must be solid tantalum. 25 μF
aluminum electrolytic may be substituted.
Values given may be increased without
limit.
For output capacitance in excess of 100
μF, a high current diode from input to
output (1N4001, etc.) will protect the
regulator from momentary input shorts.
Figure 2. Fixed Regulator
1
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.
2
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.
Copyright © 1998–2013, Texas Instruments Incorporated




etcTI

LM320 Datasheet Preview

LM320 Datasheet

3-Terminal Negative Regulators

No Preview Available !

LM120, LM320-N
SNVS756C – APRIL 1998 – 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.
ABSOLUTE MAXIMUM RATINGS5 VOLT REGULATORS(1)(2)(3)
Power Dissipation
Input Voltage
Input-Output Voltage Differential
Junction Temperatures
Storage Temperature Range
Lead Temperature
(Soldering, 10 sec.)
Plastic
Internally Limited
25V
25V
(4)
65°C to +150°C
300°C
260°C
(1) Refer to RETS120-5H drawing for LM120H-5.0 or RETS120-5K drawing for LM120-5K military specifications.
(2) For 5V 3 amp regulators, see LM145 data sheet.
(3) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and
specifications.
(4) This specification applies over 55°C TJ +150°C for the LM120 and 0°C TJ +125°C for the LM320-N.
LM120K-5.0 AND LM320K-5.0 ELECTRICAL CHARACTERISTICS(1)
Order Numbers
Metal Can Package
LM120K-5.0
(TO-3)
LM320K-5.0
(TO-3)
Parameter
Design Output Current (ID)
Device Dissipation (PD)
Conditions (2)
1.5A
20W
Min Typ Max Min Typ Max
Output Voltage
Line Regulation
Input Voltage
TJ = 25°C, VIN =10V,
ILOAD = 5 mA
TJ = 25°C, ILOAD = 5 mA,
VMIN VIN VMAX
5.1 5 4.9 5.2 5 4.8
10 25
10 40
25 7 25 7
Ripple Rejection
f = 120 Hz
54 64
54 64
Load Regulation,
(3)
Output Voltage,
(2)
Quiescent Current
Quiescent Current
Change
Output Noise Voltage
Long Term Stability
TJ = 25°C, VIN = 10V,
5 mA ILOAD ID
7.5V VIN VMAX,
5 mA ILOAD ID, P PD
VMIN VIN VMAX
TJ = 25°C
VMIN VIN VMAX
5 mA ILOAD ID
TA = 25°C, CL = 1 μF, IL = 5 mA,
VIN = 10V, 10 Hz f 100 kHz
50 75
60 100
5.20
4.80 5.25
4.75
12
12
0.1 0.4
0.1 0.4
150
0.1 0.4
0.1 0.4
150
5 50
5 50
Thermal Resistance
Junction to Case
33
Junction to Ambient
35 35
Units
V
mV
V
dB
mV
V
mA
mA
mA
μV
mV
°C/W
°C/W
(1) For 5V 3 amp regulators, see LM145 data sheet.
(2) This specification applies over 55°C TJ +150°C for the LM120 and 0°C TJ +125°C for the LM320-N.
(3) Regulation is measured at constant junction temperature. Changes in output voltage due to heating effects must be taken into account
separately. To ensure constant junction temperature, low duty cycle, pulse testing is used. The LM120/LM320-N series does have low
thermal feedback, improving line and load regulation. On all other tests, even though power dissipation is internally limited, electrical
specifications apply only up to PD.
2 Submit Documentation Feedback
Copyright © 1998–2013, Texas Instruments Incorporated
Product Folder Links: LM120 LM320-N


Part Number LM320
Description 3-Terminal Negative Regulators
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