LM2671MX-ADJ/NOPB National Semiconductor, LM2671MX-ADJ/NOPB Datasheet
LM2671MX-ADJ/NOPB
Specifications of LM2671MX-ADJ/NOPB
*LM2671MX-ADJ/NOPB
LM2671MX-ADJ
Available stocks
Related parts for LM2671MX-ADJ/NOPB
LM2671MX-ADJ/NOPB Summary of contents
Page 1
... The output switch includes current limiting, as well as thermal shutdown for full protection under fault conditions. Typical Application (Fixed Output Voltage Versions) SIMPLE SWITCHER ® registered trademark of National Semiconductor Corporation Windows ® registered trademark of Microsoft Corporation. © 2007 National Semiconductor Corporation ® ...
Page 2
... Package Marking LM2671LD-12 LM2671LDX-12 LM2671LD-3.3 LM2671LDX-3.3 LM2671LD-5.0 LM2671LDX-5.0 LM2671LD-ADJ LM2671LDX-ADJ LM2671M-12 LM2671MX-12 LM2671M-3.3 LM2671MX-3.3 LM2671M-5.0 LM2671MX-5.0 LM2671M-ADJ 2671M-ADJ LM2671MX-ADJ 2671M-ADJ LM2671N-12 LM2671N-12 LM2671N-3.3 LM2671N-3.3 LM2671N-5.0 LM2671N-5.0 LM2671N-ADJ LM2671N-ADJ 2 8-Lead Package Top View 10004202 SO-8/DIP Package Supplied as: S0005B 1000 Units on Tape and Reel ...
Page 3
... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage ON/OFF Pin Voltage Switch Voltage to Ground Boost Pin Voltage Feedback Pin Voltage ESD Susceptibility Human Body Model (Note 2) Power Dissipation ...
Page 4
Symbol Parameter V Feedback Voltage V = 6.5V to 40V Programmed for 5V OUT (see Circuit of Figure 3) η Efficiency V = 12V All Output Voltage Versions Specifications with standard type face are ...
Page 5
Typical Performance Characteristics Normalized Output Voltage Efficiency Switch Current Limit 10004203 10004205 10004207 5 Line Regulation 10004204 Drain-to-Source Resistance 10004206 Operating Quiescent Current 10004208 www.national.com ...
Page 6
Standby Quiescent Current ON/OFF Pin Current (Sourcing) Feedback Pin Bias Current www.national.com 10004209 10004211 10004213 6 ON/OFF Threshold Voltage 10004210 Switching Frequency 10004212 Peak Switch Current 10004214 ...
Page 7
Dropout Voltage—3.3V Option Block Diagram * Patent Number 5,514,947 † Patent Number 5,382,918 Dropout Voltage—5.0V Option 10004215 FIGURE 1. 7 10004216 10004217 www.national.com ...
Page 8
Typical Performance Characteristics Continuous Mode Switching Waveforms V = 20V 5V OUT L = 100 μ 100 μF, C OUT A: V Pin Voltage, 10 V/div Inductor Current, 0.2 A/div C: Output ...
Page 9
Test Circuit and Layout Guidelines - 22 μF, 50V Tantalum, Sprague “199D Series” μF, 25V Tantalum, Sprague “595D Series” C OUT D1 - 3.3A, 50V Schottky Rectifier, IR 30WQ05F μH Sumida #RCR110D-680L - ...
Page 10
LM2671 Series Buck Regulator Design Procedure (Fixed Output) PROCEDURE (Fixed Output Voltage Version) To simplify the buck regulator design procedure, National Semiconductor is making available computer design software to be used with the SIMPLE SWITCHER line of switching regulators. LM267X ...
Page 11
PROCEDURE (Fixed Output Voltage Version) The capacitor list contains through-hole electrolytic capacitors from four different capacitor manufacturers and surface mount tantalum capacitors from two different capacitor manufacturers recommended that both the manufacturers and the manufacturer's series that are ...
Page 12
PROCEDURE (Fixed Output Voltage Version) 5. Boost Capacitor ( This capacitor develops the necessary voltage to turn the switch gate on fully. All applications should use a 0.01 μF, 50V ceramic capacitor. 6. Soft-Start Capacitor (C - optional) ...
Page 13
INDUCTOR VALUE SELECTION GUIDES (For Continuous Mode Operation) FIGURE 4. LM2671-3.3 FIGURE 5. LM2671-5.0 Schott Inducta Ind. Current nce Ref. Through (A) Desg. (μH) Hole L2 150 0.21 67143920 67144290 RL-5470-4 L3 100 0.26 67143930 67144300 RL-5470 0.32 ...
Page 14
Coilcraft Inc. Coilcraft Inc., Europe Pulse Engineering Inc. Pulse Engineering Inc., Europe Renco Electronics Inc. Schott Corp. Output Inductance Voltage Sprague (μH) (V) 594D Series (μF/V) 22 120/6.3 33 120/6.3 47 68/10 3.3 68 120/6.3 100 120/6.3 150 120/6.3 22 ...
Page 15
FAX (845) 448-1943 Sprague/Vishay Phone (207) 324-4140 FAX (207) 324-7223 Phone (619) 661-6322 Sanyo Corp. FAX (619) 661-1055 FIGURE 11. Capacitor Manufacturers' Phone Numbers 1A Diodes V Surface Through Surface R Mount Hole Mount 20V SK12 1N5817 SK32 B120 SR102 ...
Page 16
FIGURE 14. RMS Current Ratings for Low ESR Electrolytic Capacitors (Typical) AVX TPS Recommended Application Voltage +85°C Rating 3 Sprague 594D Recommended Application Voltage +85°C Rating 2.5 3.3 FIGURE 15. Recommended Application Voltage for AVX TPS ...
Page 17
PROCEDURE (Adjustable Output Voltage Version) where V = 1.21V REF Select a value for R between 240Ω and 1.5 kΩ. The lower resistor 1 values minimize noise pickup in the sensitive feedback pin. (For the lowest temperature coefficient and the ...
Page 18
PROCEDURE (Adjustable Output Voltage Version) 4. Catch Diode Selection (D1 normal operation, the average current of the catch diode is the load current times the catch diode duty cycle, 1 the switch duty cycle, which is ...
Page 19
Case Output Style (Note 7) Voltage (V) SM and TH 3.75–5.0 SM and TH 5.0–6.25 SM and TH 6.25–7.5 SM and TH 7.5–10.0 SM and TH 10.0–12.5 SM and TH 12.5–15.0 SM and TH 15.0–20.0 SM and TH 20.0–30.0 TH ...
Page 20
Application Information TYPICAL SURFACE MOUNT PC BOARD LAYOUT, FIXED OUTPUT (4X SIZE μF, 25V, Solid Tantalum Sprague, “594D series” μF, 10V, Solid Tantalum Sprague, “594D series” C OUT D1 - 1A, 40V Schottky Rectifier, ...
Page 21
LLP PACKAGE DEVICES The LM2671 is offered in the 16 lead LLP surface mount package to allow for increased power dissipation compared to the SO-8 and DIP. The Die Attach Pad (DAP) can and should be connected to PCB Ground ...
Page 22
Physical Dimensions 8-Lead (0.150 Wide) Molded Small Outline Package, JEDEC www.national.com inches (millimeters) unless otherwise noted Order Number LM2671M-3.3, LM2671M-5.0, LM2671M-12 or LM2671M-ADJ NS Package Number M08A 22 ...
Page 23
Wide) Molded Dual-In-Line Package Order Number LM2671N-3.3, LM2671N-5.0, LM2671N-12 or LM2671N-ADJ NS Package Number N08E 16-Lead LLP Surface Mount Package NS Package Number LDA16A 23 www.national.com ...
Page 24
... National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other brand or product names may be trademarks or registered trademarks of their respective holders. ...