Texas Instruments uA 7905 C INSTALLATION INSTRUCTIONS
VO(nom)
0°C to 125°C
www.DataSheet4U.com
µA7900 SERIES
NEGATIVE-VOLTAGE REGULATORS
SLVS058A – JUNE 1976 – REVISED OCTOBER 1996
D
3-Terminal Regulators
D
Output Current Up to 1.5 A
D
No External Components
D
Internal Thermal Overload Protection
D
High-Power Dissipation Capability
D
Internal Short-Circuit Current Limiting
D
Output Transistor Safe-Area Compensation
D
Essentially Equivalent to National LM320
Series
description
This series of fixed-negative-voltage monolithic
integrated-circuit voltage regulators is designed
to complement Series µA7800 in a wide range of
applications. These applications include on-card
regulation for elimination of noise and distribution
problems associated with single-point regulation.
Each of these regulators can deliver up to 1.5 A of
output current. The internal current limiting and
thermal shutdown features of these regulators
make them essentially immune to overload. In
addition to use as fixed-voltage regulators, these
devices can be used with external components to
obtain adjustable output voltages and currents
and also as the power pass element in precision
regulators.
KC PACKAGE
(TOP VIEW)
OUTPUT
INPUT
COMMON
The input terminal is in electrical
contact with the mounting base
TO–220AB
O
I
KTE PACKAGE
(TOP VIEW)
OUTPUT
INPUT
COMMON
The input terminal is in electrical contact with the mounting base.
C
T
A
°
†
The KTE package is also available taped and reeled.
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.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
°
(V)
–5 µA7905CKC µA7905CKTE µA7905Y
–5.2 µA7952CKC µA7952CKTE µA7952Y
–6 µA7906CKC µA7906CKTE µA7906Y
–8 µA7908CKC µA7908CKTE µA7908Y
–12 µA7912CKC µA7912CKTE µA7912Y
–15 µA7915CKC µA7915CKTE µA7915Y
–18 µA7918CKC µA7918CKTE µA7918Y
–24 µA7924CKC µA7924CKTE µA7924Y
AVAILABLE OPTIONS
PACKAGED DEVICES
HEAT-SINK MOUNTED
(KC)
HEAT-SINK MOUNTED
(KTE)
Copyright 1996, Texas Instruments Incorporated
O
I
C
CHIP
†
FORM
(Y)
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
1
µA7900 SERIES
www.DataSheet4U.com
NEGATIVE-VOLTAGE REGULATORS
SLVS058A – JUNE 1976 – REVISED OCTOBER 1996
schematic
5 V to 8 V
12 V to 18 V
COMMON
5 kΩ
OUTPUT
6.2 V
20 kΩ
0.2 kΩ
INPUT
All component values are nominal.
INPUT
absolute maximum ratings over operating temperature range (unless otherwise noted)
Input voltage, VI: µA7924C –40 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
All others –35 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous total power dissipation at (or below):T
Operating free-air, T
Storage temperature range, T
, case, TC, or virtual junction, TJ, temperature range 0 to 150°C. . . . . . . . . . . . . . . . . . .
A
–65 to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
stg
Lead temperature 3.2 mm (1/8 inch) from case for 10 seconds 260°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
NOTE 1: For operation above 25°C free-air or 90°C case temperature, refer to Figures 1 and 2. T o avoid exceeding the design maximum virtual
junction temperature, these ratings should not be exceeded. Due to variations in individual device electrical characteristics and thermal
resistance, the built-in thermal overload protection may be activated at power levels slightly above or below the rated dissipation.
DISSIPATION RATING TABLE — FREE-AIR TEMPERATURE
PACKAGE
KC 2000 mW 16.0 mW/°C 1280 mW 720 mW 400 mW
KTE 1900 mW 15.2 mW/°C 1216 mW 684 mW 380 mW
TA ≤ 25°C
POWER RATING
DERATING FACTOR
ABOVE TA = 25°C
DISSIPATION RATING TABLE — CASE TEMPERATURE
= 25°C (see Note 1) See Dissipation Rating Tables. . .
A
T
= 90°C (see Note 1) See Dissipation Rating Tables. . .
C
TA = 70°C
POWER RATING
POWER RATING
TA = 105°C
TA = 125°C
POWER RATING
2
PACKAGE
KC 15000 mW 250.0 mW/°C 6250 mW
KTE 14300 mW 238.0 mW/°C 5970 mW
TC ≤ 90°C
POWER RATING
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
DERATING FACTOR
ABOVE TC = 90°C
TA = 125°C
POWER RATING
Input voltage, V
V
www.DataSheet4U.com
µA7900 SERIES
NEGATIVE-VOLTAGE REGULATORS
SLVS058A – JUNE 1976 – REVISED OCTOBER 1996
FREE-AIR TEMPERATURE
DISSIPATATION DERATING CURVE
2000
1800
1600
1400
1200
1000
800
600
400
200
Maximum Continuous Dissipation – mW
Derating factor = 16 mW/°C
R
≈ 62.5°C/W
θJA
0
25
50 75 100 125 150
TA – Free-Air Temperature – ° C
Figure 1 Figure 2
recommended operating conditions
p
Output current, I
Operating virtual junction temperature, T
I
O
J
CASE TEMPERATURE
DISSIPATION DERATING CURVE
16
14
12
10
8
6
4
Maximum Continuous Dissipation – W
Derating factor = 0.25 W/°C
2
above 90°C
R
≈ 4°C/W
θJA
0
25 50 75 100
TC – Case Temperature – °C
µA7905C –7 –25
µA7952C –7.2 –25
µA7906C –8 –25
µA7908C –10.5 –25
µA7912C –14.5 –30
µA7915C –17.5 –30
µA7918C –21 –33
µA7924C –27 –28
125 150
MIN MAX UNIT
1.5 A
0 125 °C
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
3
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