December 8, 2010
LM2990QML
Negative Low Dropout Regulator
General Description
Features
The LM2990 is a three-terminal, low dropout, 1 ampere neg-
ative voltage regulator available with a fixed output voltage of
−5V.
5% output accuracy over entire operating range
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Output current in excess of 1A
Dropout voltage typically 0.6V at 1A load
Low quiescent current
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 temperature
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 ac-
curacy is guaranteed to ±5% over load, and temperature
extremes.
Internal short circuit current limit
Internal thermal shutdown with hysteresis
Functional complement to the LM2940 series
Applications
Post switcher regulator
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Local, on-card, regulation
Battery operated equipment
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.
Ordering Information
NS Part Number
LM2990-5.0 MD8
LM2990-5.0 MW8
SMD Part Number
NS Package Number
(Note 1)
Package Description
Bare Die
(Note 1)
Bare Die
Note 1: FOR ADDITIONAL DIE INFORMATION, PLEASE VISIT THE HI REL WEB SITE AT: www.national.com/analog/space/level_die
16-Lead Ceramic Dual-in-Line Package
20158633
Top View
See NS Package Number J16A
© 2010 National Semiconductor Corporation
201586
www.national.com
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