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LM2991SX/NOPB |LM2991SXNOPBNSN/a3000avaiNegative Low Dropout Adjustable Regulator 5-DDPAK/TO-263 -40 to 125


LM2991SX/NOPB ,Negative Low Dropout Adjustable Regulator 5-DDPAK/TO-263 -40 to 125features a ON /OFF pin for remote• Dropout Voltage Typically 0.6 V at 1-A Loadshutdown capability.• ..
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LM2991SX/NOPB
Negative Low Dropout Adjustable Regulator
LM2991
GND
ADJ COUTUnregulated
Input
ON/OFF
CIN+
OUTIN Regulated
Input*
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LM2991

SNVS099I –MAY 1999–REVISED OCTOBER 2016
LM2991 Negative Low-Dropout Adjustable Regulator Features
Output Voltage Adjustable from−3Vto −24V,
Typically −2Vto −25V Output Currentin Excessof1A Dropout Voltage Typically 0.6Vat 1-A Load Low Quiescent Current Internal Short Circuit Current Limit Internal Thermal Shutdown With Hysteresis TTL, CMOS Compatible ON/OFF Switch Functional Complementto the LM2941 Series Applications Post Switcher Regulator Local, On-Card, Regulation Battery Operated Equipment Industrial Instrumentation Description
The LM2991isa low dropout adjustable negative
regulator witha output voltage range between−3Vto
−24 V. The LM2991 provides upto1A of load
current and featuresa ON /OFF pin for remote
shutdown capability.
The LM2991 uses new circuit design techniquesto
providea low dropout voltage, low quiescent current
and low temperature coefficient precision reference.
The dropout voltageat 1-A load currentis typically
0.6V and an ensured worst-case maximumof1V
over the entire operating temperature range. The
quiescent currentis typically1 mA witha 1-A load
current andan input-output voltage differential greater
than3V.A unique circuit designof the internal bias
supply limits the quiescent current to only9 mA
(typical) when the regulatorisin the dropout mode
(VOUT− VIN≤3 V).
The LM2991 is short-circuit proof, and thermal
shutdown includes hysteresis to enhance the
reliabilityof the device when inadvertently overloaded
for extended periods. The LM2991is availablein5-
lead TO-220 and DDPAK/TO-263 packages andis
rated for operation over the automotive temperature
rangeof −40°Cto +125°C. Mil-Aero versions are also
available.
Device Information(1)

(1) Forall available packages, see the orderable addendumat
the endofthe data sheet.
Typical Application
further than6 inches fromthe power supply capacitors. capacitoris recommended.
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