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LM2990 Scheda tecnica(PDF) 1 Page - Texas Instruments

Il numero della parte LM2990
Spiegazioni elettronici  LM2990 Negative Low-Dropout Regulator
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LM2990 Scheda tecnica(HTML) 1 Page - Texas Instruments

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LM2990
SNVS093G – JUNE 1999 – REVISED MAY 2015
LM2990 Negative Low-Dropout Regulator
1 Features
3 Description
The LM2990 is a three-terminal, low-dropout, 1-A
1
Input Voltage: –26 V to –6 V
negative voltage regulator available with fixed output
Fixed Output Voltages:
−5 V, −5.2 V, −12 V, and
voltages of
−5 V, −5.2 V, −12 V, and −15 V.
−15 V
The LM2990 uses circuit design techniques to
5% Output Accuracy over Entire Operating Range
provide low-dropout and low-quiescent current. The
Output Current in Excess of 1 A
dropout voltage at 1-A load current is typically 0.6 V
Dropout Voltage Typically 0.6 V at 1-A Load
and an ensured worst-case maximum of 1 V over the
entire operating temperature range. The quiescent
Low Quiescent Current
current is typically 1 mA with 1-A load current and an
Internal Short-Circuit Current Limit
input-output voltage differential greater than 3 V. A
Internal Thermal Shutdown with Hysteresis
unique circuit design of the internal bias supply limits
the quiescent current to only 9 mA (typical) when the
Functional Complement to the LM2940 Series
regulator is in the dropout mode (VOUT − VIN ≤ 3 V).
Output voltage accuracy is ensured to ±5% over load
2 Applications
and temperature extremes.
Post Switcher Regulator
The LM2990 also implements short-circuit proof, and
Local, On-Card Regulation
thermal shutdown includes hysteresis to enhance the
Battery Operated Equipment
reliability of the device when overloaded for an
extended period of time.
space
space
All these features make the LM2990 an ideal
negative
power
supply
suited
for
dual
supply
space
systems. The device may also be used as fixed or
adjustable current sink load.
Typical Application
The LM2990 is available in two 3-pin packages and is
rated for operation over the junction temperature
range of
−40°C to 125°C.
Device Information(1)
* and **: Required for stability. Must be at
PART NUMBER
PACKAGE
BODY SIZE (NOM)
least a 10-
μF aluminum electrolytic or a 1-
DDPAK/TO-263 (3)
10.20 mm x 9.00 mm
μF solid tantalum to maintain stability. May
LM2990
TO-220 (3)
14.99 mm x 10.16 mm
be increased without bound to maintain
regulation during transients. Locate the
(1) For all available packages, see the orderable addendum at
capacitor as close as possible to the
the end of the datasheet.
regulator. The equivalent series resistance
(ESR) is critical, and should be less than
10
Ω over the same operating temperature
range as the regulator.
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.


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