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Part: LM2672LDX-5.0
Category:
Power Management
-> Regulators
-> Switching Regulators
Description: LM2672 - Simple Switcher Power Converter High Efficiency 1A Step-down Voltage Regulator With Features, Package: Llp, Pin Nb=16
Company: National Semiconductor Corporation
Datasheet: Download LM2672LDX-5.0 datasheet File size : 355 kB
Request For quote: Find where to buy LM2672LDX-5.0
Datasheet text preview:
LM2672 SIMPLE SWITCHER Power Converter High Efficiency 1A Step-Down Voltage Regulator with Features
April 2003
LM2672 SIMPLE SWITCHER ® Power Converter High Efficiency 1A Step-Down Voltage Regulator with Features
General Description
The LM2672 series of regulators are monolithic integrated circuits built with a LMDMOS process. These regulators provide all the active functions for a step-down (buck) switching regulator, capable of driving a 1A load current with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5.0V, 12V, and an adjustable output version. Requiring a minimum number of external components, these regulators are simple to use and include patented internal frequency compensation (Patent Nos. 5,382,918 and 5,514,947), fixed frequency oscillator, external shutdown, soft-start, and frequency synchronization. The LM2672 series operates at a switching frequency of 260 kHz, thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Because of its very high efficiency ( > 90%), the copper traces on the printed circuit board are the only heat sinking needed. A family of standard inductors for use with the LM2672 are available from several different manufacturers. This feature greatly simplifies the design of switch-mode power supplies using these advanced ICs. Also included in the datasheet are selector guides for diodes and capacitors designed to work in switch-mode power supplies. Other features include a guaranteed ± 1.5% tolerance on output voltage within specified input voltages and output load conditions, and ± 10% on the oscillator frequency. External shutdown is included, featuring typically 50 µA stand-by current. The output switch includes current limiting, as well as thermal shutdown for full protection under fault conditions. To simplify the LM2672 buck regulator design procedure, there exists computer design software, LM267X Made Simple version 6.0.
Features
n Efficiency up to 96% n Available in SO-8, 8-pin DIP and LLP packages n Computer Design Software LM267X Made Simple version 6.0 n Simple and easy to design with n Requires only 5 external components n Uses readily available standard inductors n 3.3V, 5.0V, 12V, and adjustable output versions n Adjustable version output voltage range: 1.21V to 37V n ± 1.5% max output voltage tolerance over line and load conditions n Guaranteed 1A output load current n 0.25 DMOS Output Switch n Wide input voltage range: 8V to 40V n 260 kHz fixed frequency internal oscillator n TTL shutdown capability, low power standby mode n Soft-start and frequency synchronization n Thermal shutdown and current limit protection
Typical Applications
n Simple High Efficiency ( > 90%) Step-Down (Buck) Regulator n Efficient Pre-Regulator for Linear Regulators
Typical Application
Versions)
(Fixed Output Voltage
01293401
SIMPLE SWITCHER ® is a registered trademark of National Semiconductor Corporation. Windows ® is a registered trademark of Microsoft Corporation.
© 2003 National Semiconductor Corporation
DS012934
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LM2672
Connection Diagrams
16-Lead LLP Surface Mount Package Top View 8-Lead Package Top View
01293402
SO-8/DIP Package See NSC Package Drawing Number MO8A/N08E
01293441
LLP Package See NSC Package Drawing Number LDA16A TABLE 1. Package Marking and Ordering Information Output Voltage 16 Lead LLP 12 12 3.3 3.3 5.0 5.0 ADJ ADJ SO-8 12 12 3.3 3.3 5.0 5.0 ADJ ADJ DIP 12 3.3 5.0 ADJ LM2672N-12 LM2672N-3.3 LM2672N-5.0 LM2672N-ADJ LM2672N-12 LM2672N-3.3 LM2672N-5.0 LM2672N-ADJ Shipped in Anti-Static Rails Shipped in Anti-Static Rails Shipped in Anti-Static Rails Shipped in Anti-Static Rails LM2672M-12 LM2672MX-12 LM2672M-3.3 LM2672MX-3.3 LM2672M-5.0 LM2672MX-5.0 LM2672M-ADJ LM2672MX-ADJ 2672M-12 2672M-12 2672M-3.3 2672M-3.3 2672M-5.0 2672M-5.0 2672M-ADJ 2672M-ADJ Shipped in Anti-Static Rails 2500 Units on Tape and Reel Shipped in Anti-Static Rails 2500 Units on Tape and Reel Shipped in Anti-Static Rails 2500 Units on Tape and Reel Shipped in Anti-Static Rails 2500 Units on Tape and Reel LM2672LD-12 LM2672LDX-12 LM2672LD-3.3 LM2672LDX-3.3 LM2672LD-5.0 LM2672LDX-5.0 LM2672LD-ADJ LM2672LDX-ADJ S0001B S0001B S0002B S0002B S0003B S0003B S0004B S0004B 1000 Units on Tape and Reel 4500 Units on Tape and Reel 1000 Units on Tape and Reel 4500 Units on Tape and Reel 1000 Units on Tape and Reel 4500 Units on Tape and Reel 1000 Units on Tape and Reel 4500 Units on Tape and Reel Order Information Package Marking Supplied as:
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LM2672
Absolute Maximum Ratings
(Note 1)
Lead Temperature M Package Vapor Phase (60s) Infrared (15s) N Package (Soldering, 10s) LLP Package (see AN-1187) Maximum Junction Temperature +150°C +215°C +220°C +260°C
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 Storage Temperature Range 2 kV Internally Limited -65°C to +150°C 45V -0.1V VSH 6V -1V VSW + 8V -0.3V VFB 14V
Operating Ratings
Supply Voltage Temperature Range 6.5V to 40V -40°C TJ +125°C
Electrical Characteristics LM2672-3.3 Specifications with standard type face are for TJ = 25°C, and those in bold type face apply over full
Operating Temperature Range. Symbol Parameter Conditions Typical (Note 4) SYSTEM PARAMETERS Test Circuit Figure 2 (Note 3) VOUT VOUT Output Voltage Output Voltage Efficiency VIN = 8V to 40V, ILOAD = 20 mA to 1A VIN = 6.5V to 40V, ILOAD = 20 mA to 500 mA VIN = 12V, ILOAD = 1A 3.3 3.3 86 3.251/3.201 3.251/3.201 3.350/3.399 3.350/3.399 V V % Min (Note 5) Max (Note 5) Units
LM2672-5.0
Symbol Parameter Conditions Typical (Note 4) SYSTEM PARAMETERS Test Circuit Figure 2 (Note 3) VOUT VOUT Output Voltage Output Voltage Efficiency VIN = 8V to 40V, ILOAD = 20 mA to 1A VIN = 6.5V to 40V, ILOAD = 20 mA to 500 mA VIN = 12V, ILOAD = 1A 5.0 5.0 90 4.925/4.850 4.925/4.850 5.075/5.150 5.075/5.150 V V % Min (Note 5) Max (Note 5) Units
LM2672-12
Symbol Parameter Conditions Typical (Note 4) SYSTEM PARAMETERS Test Circuit Figure 2 (Note 3) VOUT Output Voltage Efficiency VIN = 15V to 40V, ILOAD = 20 mA to 1A VIN = 24V, ILOAD = 1A 12 94 11.82/11.64 12.18/12.36 V % Min (Note 5) Max (Note 5) Units
LM2672-ADJ
Symbol Parameter Conditions Typ (Note 4) SYSTEM PARAMETERS Test Circuit Figure 3 (Note 3) VFB Feedback Voltage VIN = 8V to 40V, ILOAD = 20 mA to 1A VOUT Programmed for 5V (see Circuit of Figure 3) VFB Feedback Voltage VIN = 6.5V to 40V, ILOAD = 20 mA to 500 mA VOUT Programmed for 5V (see Circuit of Figure 3)
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Min (Note 5)
Max (Note 5)
Units
1.210
1.192/1.174
1.228/1.246
V
1.210
1.192/1.174
1.228/1.246
V
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