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LM7912 Datasheet Preview

LM7912 Datasheet

3-Terminal Negative Regulator

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LM7905, LM7912, LM7915
www.ti.com
SNOSBQ7C – JUNE 1999 – REVISED MAY 2013
LM79XX Series 3-Terminal Negative Regulators
Check for Samples: LM7905, LM7912, LM7915
FEATURES
1
2 Thermal, Short Circuit and Safe Area
Protection
• High Ripple Rejection
• 1.5A Output Current
• 4% Tolerance on Preset Output Voltage
space
Connection Diagram
DESCRIPTION
The LM79XX 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 LM79XX series is packaged in the TO-220 power
package and is capable of supplying 1.5A 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 LM79XX series allows
output voltage to be easily boosted above the preset
value with a resistor divider. The low quiescent
current drain of these devices with a specified
maximum change with line and load ensures good
regulation in the voltage boosted mode.
For applications requiring other voltages, see LM137
datasheet.
Figure 1. TO-220 Package
Front View
See Package Number NDE0003B
Typical Applications
*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.
†Required for stability. For value given,
capacitor must be solid tantalum. 25μF
aluminum electrolytic may be substituted.
Values given may be increased without
limit.
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.
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 © 1999–2013, Texas Instruments Incorporated




etcTI

LM7912 Datasheet Preview

LM7912 Datasheet

3-Terminal Negative Regulator

No Preview Available !

LM7905, LM7912, LM7915
SNOSBQ7C – JUNE 1999 – REVISED MAY 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 RATINGS(1)
Input Voltage
(Vo = 5V)
(Vo = 12V and 15V)
Input-Output Differential
(Vo = 5V)
(Vo = 12V and 15V)
Power Dissipation (2)
Operating Junction Temperature Range
Storage Temperature Range
Lead Temperature (Soldering, 10 sec.)
25V
35V
25V
30V
Internally Limited
0°C to +125°C
65°C to +150°C
230°C
(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 ensure Specific Performance limits. For ensured specifications and test
conditions, see the Electrical Characteristics.
(2) Refer to DESIGN CONSIDERATIONS for details.
ELECTRICAL CHARACTERISTICS
Conditions unless otherwise noted: IOUT = 500mA, CIN = 2.2μF, COUT = 1μF, 0°C TJ +125°C, Power Dissipation 1.5W.
Part Number
LM7905C
Units
Output Voltage
5V
Input Voltage (unless otherwise specified)
10V
Symbol
Parameter
Conditions
Min
Typ
Max
VO
Output Voltage
ΔVO
Line Regulation
TJ = 25°C
5mA IOUT 1A,
P 15W
TJ = 25°C, (1)
4.8
5.0
5.2
V
4.75
5.25
V
(20 VIN ≤ −7)
V
8
50
mV
(25 VIN ≤ −7)
V
2
15
mV
ΔVO
Load Regulation
IQ
Quiescent Current
ΔIQ
Quiescent Current
Change
Vn
Output Noise Voltage
Ripple Rejection
TJ = 25°C, (1)
5mA IOUT 1.5A
250mA IOUT 750mA
TJ = 25°C
With Line
With Load, 5mA IOUT 1A
TA = 25°C, 10Hz f 100Hz
f = 120Hz
(12 VIN ≤ −8)
V
15
100
mV
5
50
mV
1
2
mA
0.5
mA
(25 VIN ≤ −7)
V
0.5
mA
125
μV
54
66
dB
IOMAX
Dropout Voltage
Peak Output Current
Average Temperature
Coefficient of
Output Voltage
TJ = 25°C, IOUT = 1A
TJ = 25°C
IOUT = 5mA,
0 C TJ 100°C
(18 VIN ≤ −8)
1.1
2.2
0.4
V
V
A
mV/°C
(1) Regulation is measured 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.
2
Submit Documentation Feedback
Copyright © 1999–2013, Texas Instruments Incorporated
Product Folder Links: LM7905 LM7912 LM7915



Part Number LM7912
Description 3-Terminal Negative Regulator
Maker etcTI
Total Page 3 Pages
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LM7912 Datasheet PDF





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