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LM2674 Datasheet PDF

Part Series:LM2674 Series
Description:SIMPLE SWITCHER® Power Converter High Efficiency 500mA Step-Down Voltage Regulator
Document:LM2674M-12/NOPB Datasheet PDF (36 Pages)

LM2674 Datasheet PDF

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Conv DC-DC 8V to 40V Step Down Single-Out 3.3V 0.5A 8Pin SOIC T/R
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Conv DC-DC 8V to 40V Step Down Single-Out 5V 0.5A 8Pin PDIP Tube
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Conv DC-DC 8V to 40V Step Down Single-Out 5V 0.5A 8Pin SOIC Tube
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Conv DC-DC 8V to 40V Step Down Single-Out 5V 0.5A 8Pin SOIC Tube
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Conv DC-DC 8V to 40V Step Down Single-Out 1.21V to 37V 0.5A 8Pin PDIP Tube
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Conv DC-DC 8V to 40V Step Down Single-Out 12V 0.5A 8Pin SOIC T/R
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Conv DC-DC 8V to 40V Step Down Single-Out 12V 0.5A 8Pin SOIC Tube
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Conv DC-DC 8V to 40V Step Down Single-Out 1.21V to 37V 0.5A 16Pin WSON EP T/R
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LM2674 - TI Function Overview

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 3.3 V, 5 V, 12 V, and an adjustable output version.
Requiring a minimum number of external components, these regulators are simple to use and include patented internal frequency compensation and a fixed frequency oscillator.
The LM2674 series operates at a switching frequency of 260 kHz, thus allowing smaller sized filter components than what is required 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 required.
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 data sheet are selector guides for diodes and capacitors designed to work in switch-mode power supplies.
Other features include an ensured ±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 standby current. The output switch includes current limiting, as well as thermal shutdown for full protection under fault conditions.
Efficiency up to 96%
Available in 8-Pin SOIC, PDIP, and 16-Pin WSON
Packages
Simple and Easy to Design With
Requires Only 5 External Components
Uses Readily Available Standard Inductors
3-V, 5-V, 12-V, and Adjustable Output Versions
Adjustable Version Output Voltage Range: 1.21 V
to 37 V
±1.5% Maximum Output Voltage Tolerance Over
Line and Load Conditions
Ensured 500-mA Output Load Current
0.25-Ω DMOS Output Switch
Wide Input Voltage Range: 8 V to 40 V
260-kHz Fixed Frequency Internal Oscillator
TTL Shutdown Capability, Low Power Standby
Mode
Thermal Shutdown and Current Limit Protection
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