| Part Number(s) (NSID) |
Top View | Type | Pins | MSL Rating | Peak Reflow | RoHS Status |
CAD Symbols | Models | Package Marking Format |
|---|---|---|---|---|---|---|---|---|---|
| LM2674LD-3.3/NOPB LM2674LD-3.3 |
 |
LLP | 16 | 3 1 |
260 235 |
Detail | Download | N/A |
NS UZXYTT S000AB |
| LM2674LD-ADJ/NOPB LM2674LD-ADJ |
|
LLP | 16 | 3 1 |
260 235 |
Detail | Download | N/A |
NS UZXYTT S000CB |
| LM2674LDX-5.0/NOPB LM2674LDX-5.0 |
|
LLP | 16 | 3 1 |
260 235 |
Detail | Download | N/A |
NS UZXYTT S000BB |
| LM2674M-12/NOPB LM2674M-12 |
 |
SOIC NARROW | 8 | 1 1 |
260 235 |
Detail | Download | N/A |
NSZXTT 2674 M-12 |
| LM2674M-3.3/NOPB LM2674M-3.3 |
|
SOIC NARROW | 8 | 1 1 |
260 235 |
Detail | Download | N/A |
NSZXTT 2674 M3.3 |
| LM2674M-5.0/NOPB LM2674M-5.0 |
|
SOIC NARROW | 8 | 1 1 |
260 235 |
Detail | Download | N/A |
NSZXTT 2674 M5.0 |
| LM2674M-ADJ/NOPB LM2674M-ADJ |
|
SOIC NARROW | 8 | 1 1 |
260 235 |
Detail | Download | N/A |
NSZXTT 2674 MADJ |
| LM2674MX-12/NOPB LM2674MX-12 |
|
SOIC NARROW | 8 | 1 1 |
260 235 |
Detail | Download | N/A |
NSZXTT 2674 M-12 |
| LM2674MX-3.3/NOPB LM2674MX-3.3 |
|
SOIC NARROW | 8 | 1 1 |
260 235 |
Detail | Download | N/A |
NSZXTT 2674 M3.3 |
| LM2674MX-5.0/NOPB LM2674MX-5.0 |
|
SOIC NARROW | 8 | 1 1 |
260 235 |
Detail | Download | N/A |
NSZXTT 2674 M5.0 |
| LM2674MX-ADJ/NOPB LM2674MX-ADJ |
|
SOIC NARROW | 8 | 1 1 |
260 235 |
Detail | Download | N/A |
NSZXTT 2674 MADJ |
| LM2674N-12/NOPB LM2674N-12 |
 |
MDIP | 8 | 1 1 |
NA NA |
Detail | Download | N/A |
NSUZXYTTE# LM2674 N-12 |
| LM2674N-3.3/NOPB LM2674N-3.3 |
|
MDIP | 8 | 1 1 |
NA NA |
Detail | Download | N/A |
NSUZXYTTE# LM2674 N-3.3 |
| LM2674N-5.0/NOPB LM2674N-5.0 |
|
MDIP | 8 | 1 1 |
NA NA |
Detail | Download | N/A |
NSUZXYTTE# LM2674 N-5.0 |
| LM2674N-ADJ/NOPB LM2674N-ADJ |
|
MDIP | 8 | 1 1 |
NA NA |
Detail | Download | N/A |
NSUZXYTTE# LM2674 N-ADJ |
PDF
Description
The LM2674 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 500 mA 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) and a fixed frequency oscillator.
The LM2674 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 LM2674 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 LM2674 buck regulator design procedure, there exists computer design software, LM267X Made Simple (version 6.0).
| • | Simple High Efficiency (>90%) Step-Down (Buck) Regulator |
| • | Efficient Pre-Regulator for Linear Regulators |
| • | Positive-to-Negative Converter |
| • | Efficiency up to 96% |
| • | Available in SO-8, 8-pin DIP and LLP packages |
| • | Computer Design Software LM267X Made Simple (version 6.0) |
| • | Simple and easy to design with |
| • | Requires only 5 external components |
| • | Uses readily available standard inductors |
| • | 3.3V, 5.0V, 12V, and adjustable output versions |
| • | Adjustable version output voltage range: 1.21V to 37V |
| • | ±1.5% max output voltage tolerance over line and load conditions |
| • | Guaranteed 500mA output load current |
| • | 0.25 DMOS Output Switch |
| • | Wide input voltage range: 8V to 40V |
| • | 260 kHz fixed frequency internal oscillator |
| • | TTL shutdown capability, low power standby mode |
| • | Thermal shutdown and current limit protection |
Diagrams
Typical Application
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Block Diagram
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Typical Performance 
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