LM2990_15 Datasheet, PDF (1/24 Pages) Texas Instruments – LM2990 Negative Low-Dropout Regulator

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LM2990
SNVS093G – JUNE 1999 – REVISED MAY 2015
LM2990 Negative Low-Dropout Regulator
1 Features
•1 Input Voltage: –26 V to –6 V
• Fixed Output Voltages: −5 V, −5.2 V, −12 V, and
−15 V
• 5% Output Accuracy over Entire Operating Range
• Output Current in Excess of 1 A
• Dropout Voltage Typically 0.6 V at 1-A Load
• Low Quiescent Current
• Internal Short-Circuit Current Limit
• Internal Thermal Shutdown with Hysteresis
• Functional Complement to the LM2940 Series
2 Applications
• Post Switcher Regulator
• Local, On-Card Regulation
• Battery Operated Equipment
space
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Typical Application
3 Description
The LM2990 is a three-terminal, low-dropout, 1-A
negative voltage regulator available with fixed output
voltages of −5 V, −5.2 V, −12 V, and −15 V.
The LM2990 uses circuit design techniques to
provide low-dropout and low-quiescent current. The
dropout voltage at 1-A load current is typically 0.6 V
and an ensured worst-case maximum of 1 V over the
entire operating temperature range. The quiescent
current is typically 1 mA with 1-A load current and an
input-output voltage differential greater than 3 V. 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 (V_OUT − V_IN ≤ 3 V).
Output voltage accuracy is ensured to ±5% over load
and temperature extremes.
The LM2990 also implements short-circuit proof, and
thermal shutdown includes hysteresis to enhance the
reliability of the device when overloaded for an
extended period of time.
All these features make the LM2990 an ideal
negative power supply suited for dual supply
systems. The device may also be used as fixed or
adjustable current sink load.
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.
* and **: 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
10 Ω over the same operating temperature
range as the regulator.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM2990
DDPAK/TO-263 (3)
TO-220 (3)
10.20 mm x 9.00 mm
14.99 mm x 10.16 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
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.