LM2991S National Semiconductor, LM2991S Datasheet
LM2991S
Specifications of LM2991S
Available stocks
Related parts for LM2991S
LM2991S 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
... Ceramic, Surface-Mount See NS Package Number WG16A NSC Package TS5B TS5B T05A T05D J16A J16A WG16A 2 1126002 Front View 1126030 Top View Package Marking Supplied As LM2991S Rail of 45 LM2991S Reel of 500 LM2991T Rail of 45 LM2991T Rail of 45 5962-9650501QEA - 5962-9650501VEA - 5962-9650501QXA Tray of 42 ...
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 ...