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LM2991T-NOPB Arkusz danych(PDF) 1 Page - Texas Instruments

Numer części LM2991T-NOPB
Szczegółowy opis  LM2991 Negative Low Dropout Adjustable Regulator
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Strona internetowa  http://www.ti.com
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LM2991T-NOPB Arkusz danych(HTML) 1 Page - Texas Instruments

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LM2991
www.ti.com
SNVS099H – MAY 1999 – REVISED JUNE 2013
LM2991 Negative Low Dropout Adjustable Regulator
Check for Samples: LM2991
1
FEATURES
DESCRIPTION
The LM2991 is a low dropout adjustable negative
2
Output Voltage Adjustable from
−3V to −24V,
regulator with a output voltage range between
−3V to
Typically
−2V to −25V
−24V. The LM2991 provides up to 1A of load current
Output Current in Excess of 1A
and features a On /Off pin for remote shutdown
Dropout Voltage Typically 0.6V at 1A Load
capability.
Low Quiescent Current
The LM2991 uses new circuit design techniques to
provide a low dropout voltage, low quiescent current
Internal Short Circuit Current Limit
and low temperature coefficient precision reference.
Internal Thermal Shutdown with Hysteresis
The dropout voltage at 1A load current is typically
TTL, CMOS Compatible ON/OFF Switch
0.6V and an ensured worst-case maximum of 1V
Functional Complement to the LM2941 Series
over the entire operating temperature range. The
quiescent current is typically 1 mA with a 1A load
current and an input-output voltage differential greater
APPLICATIONS
than 3V. A unique circuit design of the internal bias
Post Switcher Regulator
supply limits the quiescent current to only 9 mA
Local, On-Card, Regulation
(typical) when the regulator is in the dropout mode
(VOUT − VIN ≤ 3V).
Battery Operated Equipment
The LM2991 is short-circuit proof, and thermal
shutdown
includes
hysteresis
to
enhance
the
reliability of the device when inadvertently overloaded
for extended periods. The LM2991 is available in 5-
lead TO-220 and DDPAK/TO-263 packages and is
rated for operation over the automotive temperature
range of
−40°C to +125°C. Mil-Aero versions are also
available.
Typical Application
VOUT = VREF (1 + R2/R1)
*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 10
Ω over the same operating
temperature range as the regulator.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 1999–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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