| Part Number(s) (NSID) |
Top View | Type | Pins | MSL Rating | Peak Reflow | RoHS Status |
CAD Symbols | Models | Package Marking Format |
|---|---|---|---|---|---|---|---|---|---|
| LM2671LD-ADJ/NOPB LM2671LD-ADJ |
 |
LLP | 16 | 3 1 |
260 235 |
Detail | Download | N/A |
NS UZXYTT S0008B |
| LM2671M-12/NOPB LM2671M-12 |
 |
SOIC NARROW | 8 | 1 1 |
260 235 |
Detail | Download | N/A |
NSZXTT 2671 M-12 |
| LM2671M-3.3/NOPB LM2671M-3.3 |
|
SOIC NARROW | 8 | 1 1 |
260 235 |
Detail | Download | N/A |
NSZXTT 2671 M3.3 |
| LM2671M-5.0/NOPB LM2671M-5.0 |
|
SOIC NARROW | 8 | 1 1 |
260 235 |
Detail | Download | N/A |
NSZXTT 2671 M5.0 |
| LM2671M-ADJ/NOPB LM2671M-ADJ |
|
SOIC NARROW | 8 | 1 1 |
260 235 |
Detail | Download | N/A |
NSZXTT 2671 MADJ |
| LM2671MX-12/NOPB LM2671MX-12 |
|
SOIC NARROW | 8 | 1 1 |
260 235 |
Detail | Download | N/A |
NSZXTT 2671 M-12 |
| LM2671MX-3.3/NOPB |
|
SOIC NARROW | 8 | 1 | 260 | Detail | Download | N/A |
NSZXTT 2671 M3.3 |
| LM2671MX-5.0/NOPB LM2671MX-5.0 |
|
SOIC NARROW | 8 | 1 1 |
260 235 |
Detail | Download | N/A |
NSZXTT 2671 M5.0 |
| LM2671MX-ADJ/NOPB LM2671MX-ADJ |
|
SOIC NARROW | 8 | 1 1 |
260 235 |
Detail | Download | N/A |
NSZXTT 2671 MADJ |
| LM2671N-12/NOPB LM2671N-12 |
 |
MDIP | 8 | 1 1 |
NA NA |
Detail | Download | N/A |
NSUZXYTTE# LM2671 N-12 |
| LM2671N-3.3/NOPB LM2671N-3.3 |
|
MDIP | 8 | 1 1 |
NA NA |
Detail | Download | N/A |
NSUZXYTTE# LM2671 N-3.3 |
| LM2671N-5.0/NOPB LM2671N-5.0 |
|
MDIP | 8 | 1 1 |
NA NA |
Detail | Download | N/A |
NSUZXYTTE# LM2671 N-5.0 |
| LM2671N-ADJ/NOPB LM2671N-ADJ |
|
MDIP | 8 | 1 1 |
NA NA |
Detail | Download | N/A |
NSUZXYTTE# LM2671 N-ADJ |
PDF
Description
The LM2671 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 500mA 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 LM2671 series operates at a switching frequency of
A family of standard inductors for use with the LM2671 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 LM2671 buck regulator design procedure, there exists computer design software,
| • | Simple High Efficiency (>90%) Step-Down (Buck) Regulator |
| • | Efficient Pre-Regulator for Linear Regulators |
| • | Efficiency up to 96% |
| • | Available in SO-8, 8-pin DIP and LLP packages |
| • | Computer Design Software |
| • | 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 |
| • | 0.25Ω DMOS Output Switch |
| • | Wide input voltage range: 8V to 40V |
| • | 260 kHz fixed frequency internal oscillator |
| • | TTL shutdown capability, low power standby mode |
| • | Soft-start and frequency synchronization |
| • | 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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