Data Sheet

ManualsBrandsUnbranded ManualsActive ComponentsLM7912CT/NOPB PMIC - LDO voltage regulator Negative, fixed TO 220 3

Table Of Contents

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

Connection Diagram

• Thermal, Short Circuit and Safe Area

Protection

• High Ripple Rejection

• 1.5A Output Current

• 4% Tolerance on Preset Output Voltage

space

DESCRIPTION

Figure 1. TO-220 Package

The LM79XX series of 3-terminal regulators is

Front View

available with fixed output voltages of −5V, −12V, and

See Package Number NDE0003B

−15V. These devices need only one external

component—a compensation capacitor at the output.

The LM79XX series is packaged in the TO-220 power

Typical Applications

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

*Required if regulator is separated from

current drain of these devices with a specified

filter capacitor by more than 3″. For value

maximum change with line and load ensures good

given, capacitor must be solid tantalum.

regulation in the voltage boosted mode.

25μF aluminum electrolytic may be

substituted.

For applications requiring other voltages, see LM137

†Required for stability. For value given,

datasheet.

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

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.

2All trademarks are the property of their respective owners.

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.

Summary of content (13 pages)

PAGE 1
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 DESCRIPTION The LM79XX series of 3-terminal regulators is available with fixed output voltages of −5V, −12V, and −15V.
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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.
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LM7905, LM7912, LM7915 www.ti.com SNOSBQ7C – JUNE 1999 – REVISED MAY 2013 ELECTRICAL CHARACTERISTICS Conditions unless otherwise noted: IOUT = 500mA, CIN = 2.2μF, COUT = 1μF, 0°C ≤ TJ ≤ +125°C, Power Dissipation ≤ 1.5W. Part Number LM7912C LM7915C Output Voltage −12V −15V Input Voltage (unless otherwise specified) −19V Symbol VO Parameter Output Voltage Conditions ΔVO Line Regulation Load Regulation Typ Max Min Typ Max TJ = 25°C −11.5 −12.0 −12.5 −14.4 −15.0 −15.
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LM7905, LM7912, LM7915 SNOSBQ7C – JUNE 1999 – REVISED MAY 2013 www.ti.com DESIGN CONSIDERATIONS The LM79XX fixed voltage regulator series has thermal overload protection from excessive power dissipation, internal short circuit protection which limits the circuit's maximum current, and output transistor safe-area compensation for reducing the output current as the voltage across the pass transistor is increased.
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LM7905, LM7912, LM7915 www.ti.com SNOSBQ7C – JUNE 1999 – REVISED MAY 2013 Load and line regulation < 0.01% temperature stability ≤ 0.2% †Determine Zener current ††Solid tantalum *Select resistors to set output voltage. 2 ppm/°C tracking suggested Figure 3. High Stability 1 Amp Regulator Figure 4. Current Source *Lamp brightness increase until iI= iQ (≈ 1 mA) + 5V/R1. †Necessary only if raw supply filter capacitor is more that 2″ from LM7905CT Figure 5.
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LM7905, LM7912, LM7915 SNOSBQ7C – JUNE 1999 – REVISED MAY 2013 www.ti.com *Lamp brightness increases until ii = 5V/R1 (Ii can be set as low as 1 μA) †Necessary only if raw supply filter capacitor is more that 2″ from LM7905 Figure 6. High-Sensitivity Light Controller *Improves transient response and ripple rejection. Do not increase beyond 50 μF. Select R2 as follows: LM7905CT 300Ω LM7912CT 750Ω LM7915CT 1k Figure 7.
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LM7905, LM7912, LM7915 www.ti.com SNOSBQ7C – JUNE 1999 – REVISED MAY 2013 (-15) (+15) Load Regulation at ΔIL = 1A 40mV 2mV Output Ripple, CIN = 3000µF, IL = 1A 100 µVms 100 µVms Temperature Stability 50mV 50mV Output Noise 10Hz ≤ f ≤ 10kHz 150 µVms 150 µVms *Resistor tolerance of R4 and R5 determine matching of (+) and (−) outputs. **Necessary only if raw supply filter capacitors are more than 3″ from regulators. Figure 8. ±15V, 1 Amp Tracking Regulators Figure 9.
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LM7905, LM7912, LM7915 SNOSBQ7C – JUNE 1999 – REVISED MAY 2013 www.ti.com Schematic Diagrams Figure 10. −5V Figure 11.
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LM7905, LM7912, LM7915 www.ti.com SNOSBQ7C – JUNE 1999 – REVISED MAY 2013 REVISION HISTORY Changes from Revision B (May 2013) to Revision C • Page Changed layout of National Data Sheet to TI format. ...........................................................................................................
PAGE 10
PACKAGE OPTION ADDENDUM www.ti.
PAGE 11
PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 (6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish value exceeds the maximum column width. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided.
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MECHANICAL DATA NDE0003B www.ti.
PAGE 13
IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.