LM2991T/NOPB National Semiconductor, LM2991T/NOPB Datasheet
LM2991T/NOPB
Manufacturer Part Number
LM2991T/NOPB
Description
IC REG NEG LDO ADJ V 1A TO-220
Manufacturer
National Semiconductor
Type
Voltage Regulatorr
Specifications of LM2991T/NOPB
Regulator Topology
Negative Adjustable
Voltage - Output
-3 ~ -24 V
Voltage - Input
0.3 ~ -26 V
Voltage - Dropout (typical)
0.6V @ 1A
Number Of Regulators
1
Current - Output
1A
Current - Limit (min)
1.5A
Operating Temperature
-40°C ~ 125°C
Mounting Type
Through Hole
Package / Case
TO-220-5 (Straight Leads)
Current, Output
2 A
Current, Supply
0.7 mA
Package Type
TO-220
Regulation, Line
0.004 %/V
Regulation, Load
0.04 %
Regulator Type
Negative Voltage Out
Temperature, Operating, Range
-40 to +125 °C
Voltage, Dropout
0.1 V
Voltage, Input
-26 V
Voltage, Noise
200 μV
Voltage, Output
-2 to -25 V
Voltage, Supply, Rejection Ratio
60 dB
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
*LM2991T
*LM2991T/NOPB
LM2991T
*LM2991T/NOPB
LM2991T
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LM2991T/NOPB
Manufacturer:
TI
Quantity:
50
LM2991
Negative Low Dropout Adjustable Regulator
General Description
The LM2991 is a low dropout adjustable negative regulator
with a output voltage range between −3V to −24V. The
LM2991 provides up to 1A of load current and features a On
/Off pin for remote shutdown capability.
The LM2991 uses new circuit design techniques to provide a
low dropout voltage, low quiescent current and low tempera-
ture coefficient precision reference. The dropout voltage at
1A load current is typically 0.6V and a guaranteed
worst-case maximum of 1V over the entire operating tem-
perature range. The quiescent current is typically 1 mA with
a 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 (V
The LM2991 is short-circuit proof, and thermal shutdown in-
cludes hysteresis to enhance the reliability of the device
when inadvertently overloaded for extended periods. The
LM2991 is available in 5-lead TO-220 and TO-263 packages
and is rated for operation over the automotive temperature
range of −40˚C to +125˚C. Mil-Aero versions are also avail-
able.
Typical Application
V
*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.
*
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
*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
OUT
= V
REF
(1 + R2/R1)
over the same operating temperature range as the regulator.
OUT
− V
IN
3V).
Features
n Output voltage adjustable from −3V to −24V, typically
n Output current in excess of 1A
n Dropout voltage typically 0.6V at 1A load
n Low quiescent current
n Internal short circuit current limit
n Internal thermal shutdown with hysteresis
n TTL, CMOS compatible ON/OFF switch
n Functional complement to the LM2941 series
Applications
n Post switcher regulator
n Local, on-card, regulation
n Battery operated equipment
−2V to −25V
DS011260-1
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LM2991T/NOPB Summary of contents
Page 1
LM2991 Negative Low Dropout Adjustable Regulator General Description The LM2991 is a low dropout adjustable negative regulator with a output voltage range between −3V to −24V. The LM2991 provides load current and features a On /Off ...
Page 2
... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Input Voltage ESD Susceptibility (Note 2) Power Dissipation (Note 3) Junction Temperature (T ) Jmax Electrical Characteristics V = −10V −3V 1A µ 2.7k the entire operating junction temperature range. ...
Page 3
Physical Dimensions inches (millimeters) unless otherwise noted 5-Lead T0-220, Straight Leads (T) Order Number LM2991T NS Package Number T05A 5-Lead T0-220, Bent, Staggered Leads (T) Order Number LM2991T Flow LBO3 NS Package Number T05D 9 ...