LM2991S/NOPB National Semiconductor, LM2991S/NOPB Datasheet

LM2991S/NOPB

Manufacturer Part Number

LM2991S/NOPB

Description

IC REG NEG LDO ADJ V 1A TO-263-5

Manufacturer

National Semiconductor

Datasheet

1.LM2991TNOPB.pdf (14 pages)

Specifications of LM2991S/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

Current - Output

Current - Limit (min)

1.5A

Operating Temperature

-40°C ~ 125°C

Mounting Type

Surface Mount

Package / Case

TO-263-5, DÂ²Pak (5 leads + Tab), TO-263BA

Number Of Outputs

Polarity

Negative

Input Voltage Max

0.3 V

Output Voltage

- 3 V to - 24 V

Output Type

Adjustable

Dropout Voltage (max)

0.2 V at 100 mA

Output Current

1 A

Line Regulation

0.04 %/V

Load Regulation

0.4 %

Maximum Operating Temperature

+ 125 C

Mounting Style

SMD/SMT

Minimum Operating Temperature

- 40 C

Reference Voltage

- 1.186 V

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Other names

*LM2991S
*LM2991S/NOPB
LM2991S

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Amily Shenzhen XNWY Technology Co., Ltd

Part Number:

LM2991S/NOPB

Current page: 1 of 14
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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

*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

≤

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 18, 2010

Related parts for LM2991S/NOPB

LM2991S/NOPB 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. © 2010 National Semiconductor Corporation LM2991 Features ■ ...

Page 2

Connection Diagrams Front View TO-220, 5-Lead, Straight See NS Package Number T05A Top View 16-Lead, Ceramic, Dual-in-Line See NS Package Number J16A Ordering Information Order Number Package Type LM2991S 5-Lead TO-263 LM2991SX 5-Lead TO-263 LM2991T 5-Pin TO-220 LM2991T / LB03 ...

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) Electrical Characteristics = 47 μ 2.7 kΩ −10V −3V 1A entire operating junction temperature range. Parameter ≤ ...

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 5-Lead T0-220, Bent, Staggered Leads (T) Order Number LM2991T Flow LBO3 NS Package Number T05D 10 ...

Page 11

TO-263 5-Lead Plastic Surface Mount Package Ordering Number LM2991S NS Package Number TS5B 16-Lead Ceramic Dual-in-Line Package Order Number LM2991J-QMLV 5962-9650501VEA Order Number LM2991J-QML 5962-9650501QEA NS Package Number J16A 11 www.national.com ...

Page 12

Ceramic Surface-Mount Package Order Number LM2991WG-QML 5962-9650501QXA NS Package Number WG16A 12 ...

Page 13

Notes 13 www.national.com ...

Page 14

... 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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