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PDF LM2990S-12 Data sheet ( Hoja de datos )
| Número de pieza | LM2990S-12 | |
| Descripción | Negative Low Dropout Regulator | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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June 1999
LM2990
Negative Low Dropout Regulator
General Description
The LM2990 is a three-terminal, low dropout, 1 ampere
negative voltage regulator available with fixed output volt-
ages of −5, −5.2, −12, and −15V.
The LM2990 uses new circuit design techniques to provide
low dropout and low quiescent current. The dropout voltage
at 1A load current is typically 0.6V and a guaranteed
worst-case maximum of 1V over the entire operating tem-
perature range. The quiescent current is typically 1 mA with
1A load current and an input-output voltage differential
greater than 3V. A unique circuit design of the internal bias
supply limits the quiescent current to only 9 mA (typical)
when the regulator is in the dropout mode (VOUT − VIN ≤ 3V).
Output voltage accuracy is guaranteed to ±5% over load,
and temperature extremes.
The LM2990 is short-circuit proof, and thermal shutdown in-
cludes hysteresis to enhance the reliability of the device
when overloaded for an extended period of time. The
LM2990 is available in a 3-lead TO-220 package and is rated
for operation over the automotive temperature range of
−40˚C to +125˚C.
Features
n 5% output accuracy over entire operating range
n Output current in excess of 1A
n Dropout voltage typically 0.6V at 1A load
n Low quiescent current
n Internal short circuit current limit
n Internal thermal shutdown with hysteresis
n Functional complement to the LM2940 series
Applications
n Post switcher regulator
n Local, on-card, regulation
n Battery operated equipment
Typical Application
DS010801-1
*Required if the regulator is located further than 6 inches from the power supply filter capacitors. A 1 µF solid tantalum or a 10 µF aluminum electrolytic
capacitor is recommended.
**Required for stability. Must be at least a 10 µF aluminum electrolytic or a 1 µF solid tantalum to maintain stability. May be increased without bound to
maintain regulation during transients. Locate the capacitor as close as possible to the regulator. The equivalent series resistance (ESR) is critical, and
should be less than 10Ω over the same operating temperature range as the regulator.
Ordering Information and Connection Diagrams
Temperature
Range
−40˚C to
+125˚C
−55˚C to
+125˚C
-5.0
LM2990T-5.0
LM2990S-5.0
LM2990J-5.0-QML
5962-9571101QEA
LM2990WG5.0-QML
5962-9571101QXA
Output Voltage
-5.2 -12
LM2990T-5.2
LM2990T-12
LM2990S-12
LM2990J-12-QML
5962-9571001QEA
-15
LM2990T-15
LM2990S-15
LM2990J-15-QML
5962-9570901QEA
Package
TO-220
TO-263
J16A
WG16A
© 1999 National Semiconductor Corporation DS010801
www.national.com
1 page  
Typical Performance Characteristics
Dropout Voltage
Normalized Output Voltage
LM2990-5.0 and LM2990-5.2
Quiescent Current
DS010801-14
LM2990-12
Quiescent Current
LM2990-15
Quiescent Current
DS010801-15
DS010801-16
LM2990-5 and LM2990-5.2
Low Voltage Behavior
DS010801-17
LM2990-5 and LM2990-5.2
Line Transient Response
DS010801-18
LM2990-5 and LM2990-5.2
Load Transient Response
DS010801-19
LM2990-12 and LM2990-15
Low Voltage Behavior
DS010801-20
LM2990-12 and LM2990-15
Line Transient Response
DS010801-21
LM2990-12 and LM2990-15
Load Transient Response
DS010801-22
DS010801-23
5
DS010801-24
www.national.com
5 Page 
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
16–Lead Ceramic Dual–in–Line Package
LM2990J-5.0-QML (5962-9571101QEA), LM2990J-12-QML (5962-9571001QEA), or LM2990J-15-QML (5962-9570901QEA),
NS Package Number J16A
16–Lead Ceramic Surface–Mount Package
LM2990WG5.0-QML (5962-9571101QXA)
NS Package Number WG16A
11
www.national.com
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LM2990S-12.PDF ] | |
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