LM2991T National Semiconductor, LM2991T Datasheet

IC LINEAR VOLT REG, -2V TO -25V, TO220-5

LM2991T

Manufacturer Part Number
LM2991T
Description
IC LINEAR VOLT REG, -2V TO -25V, TO220-5
Manufacturer
National Semiconductor
Datasheet

Specifications of LM2991T

Primary Input Voltage
-26V
Dropout Voltage Vdo
600mV
No. Of Outputs
1
No. Of Pins
5
Output Current
1A
Operating Temperature Range
-40°C To +125°C
Voltage Regulator Type
Linear
Topology
LDO
Regulator Output Type
Adjustable
Polarity Type
Negative
Number Of Outputs
Single
Input Voltage (min)
-26V
Input Voltage (max)
0.3V
Output Voltage
-3 to -24V
Package Type
TO-220
Load Regulation
0.4%
Line Regulation
0.04%/V
Operating Temp Range
-40C to 125C
Operating Temperature Classification
Automotive
Dropout Voltage@current (max)
0.2@100mA/0.8@1A
Dropout Voltage@current (typ)
0.1@100mA/0.6@1A
Pin Count
5 +Tab
Mounting
Through Hole
Quiescent Current (max)
5mA
Rohs Compliant
Yes
Output Voltage Adjustable Range
-2V To -25V
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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© 2011 National Semiconductor Corporation
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 temperature 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 qui-
escent 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 available.
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.
**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 10Ω over the same operating temperature range as the regulator.
OUT
= V
REF
(1 + R2/R1)
OUT
− V
IN
3V).
11260
LM2991
Features
Applications
Output voltage adjustable from −3V to −24V, typically −2V
to −25V
Output current in excess of 1A
Dropout voltage typically 0.6V at 1A load
Low quiescent current
Internal short circuit current limit
Internal thermal shutdown with hysteresis
TTL, CMOS compatible ON/OFF switch
Functional complement to the LM2941 series
Post switcher regulator
Local, on-card, regulation
Battery operated equipment
1126001
www.national.com
May 4, 2011

Related parts for LM2991T

LM2991T Summary of contents

Page 1

... Must be at least a 10 μF aluminum electrolytic 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 10Ω over the same operating temperature range as the regulator. © 2011 National Semiconductor Corporation LM2991 Features ■ ...

Page 2

... TO-263 LM2991T 5-Pin TO-220 www.national.com 1126009 Front View TO-220, 5-Lead, Straight See NS Package Number T05A 1126011 Top View TO263, 5-Lead, Surface-Mount See NS Package TS5B NSC Package Package Marking TS5B TS5B T05A 2 Supplied As LM2991S Rail of 45 LM2991S Reel of 500 LM2991T Rail of 45 ...

Page 3

... 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) Storage Temperature Range Lead Temperature (Soldering, 10 sec.) Electrical Characteristics = 47 μ 2.7 kΩ −10V − ...

Page 4

Typical Performance Characteristics Dropout Voltage Output Voltage Quiescent Current www.national.com Normalized Output Voltage 1126013 Output Noise Voltage 1126015 Maximum Output Current 1126017 4 1126014 1126016 1126018 ...

Page 5

Line Transient Response 1126019 Maximum Output Current 1126021 Output Impedance 1126023 Load Transient Response Ripple Rejection ON /OFF Control Voltage 5 1126020 1126022 1126024 www.national.com ...

Page 6

Adjust Pin Current Maximum Power Dissipation (TO-220) www.national.com Low Voltage Behavior 1126025 Maximum Power Dissipation (TO-263) (See Note 3) 1126027 6 1126026 1126028 ...

Page 7

Application Hints EXTERNAL CAPACITORS Like any low-dropout regulator, external capacitors are re- quired to stabilize the control loop. These capacitors must be correctly selected for proper performance. INPUT CAPACITOR An input capacitor is required if the regulator is located more ...

Page 8

Typical Applications www.national.com FIGURE 2. Fully Isolated Post-Switcher Regulator FIGURE 3. Adjustable Current Sink 8 1126006 1126010 ...

Page 9

Equivalent Schematic 9 www.national.com ...

Page 10

... Physical Dimensions www.national.com inches (millimeters) unless otherwise noted 5-Lead T0-220, Straight Leads (T) Order Number LM2991T NS Package Number T05A TO-263 5-Lead Plastic Surface Mount Package Ordering Number LM2991S NS Package Number TS5B 10 ...

Page 11

Notes 11 www.national.com ...

Page 12

... For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock and Timing www.national.com/timing Data Converters www.national.com/adc Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www.national.com/ldo LED Lighting www ...

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