Specification	LM2679SDX-3.3/NOPB

Current - Output	5 A
Frequency - Switching	260 kHz
Function	Step-Down
Mounting Type	Surface Mount
Number of Outputs	1
Operating Temperature [Max]	125 ¯C
Operating Temperature [Min]	-40 °C
Output Configuration	Positive
Output Type	1.81 mOhm
Package / Case	14-VDFN Exposed Pad
Supplier Device Package	14-VSON (6x5)
Synchronous Rectifier	False
Topology	Buck
Voltage - Input (Min) [Min]	8 V
Voltage - Output (Min/Fixed)	3.3 V

LM2679 Series

SIMPLE SWITCHER® 8V to 40V, 5A Step-Down DC/DC Switching Regulator with Adjustable Current Limit

Part	Output Configuration	Number of Outputs	Package / Case	Operating Temperature [Min]	Operating Temperature [Max]	Mounting Type	Topology	Function	Current - Output	Voltage - Input (Min) [Min]	Voltage - Output (Min/Fixed)	Frequency - Switching	Supplier Device Package	Output Type	Output Type	Voltage - Output (Max)
Texas Instruments LM2679SD-3.3	Positive	1	14-VDFN Exposed Pad	-40 °C	125 ¯C	Surface Mount	Buck	Step-Down	5 A	8 V	3.3 V	260 kHz	14-VSON (5x6)	1.81 mOhm
Texas Instruments LM2679SD-3.3/NOPB	Positive	1	14-VDFN Exposed Pad	-40 °C	125 ¯C	Surface Mount	Buck	Step-Down	5 A	8 V	3.3 V	260 kHz	14-VSON (5x6)	1.81 mOhm
Texas Instruments LM2679SX-ADJ	Positive	1	D2PAK (7 Leads + Tab) TO-263-8 TO-263CA	-40 °C	125 ¯C	Surface Mount	Buck	Step-Down	5 A	8 V	1.21 V	260 kHz	TO-263 (DDPAK-7)		Adjustable	37 V
Texas Instruments LM2679SDX-ADJ	Positive	1	14-VDFN Exposed Pad	-40 °C	125 ¯C	Surface Mount	Buck	Step-Down	5 A	8 V	1.21 V	260 kHz	14-VSON (5x6)		Adjustable	37 V
Texas Instruments LM2679SDX-3.3/NOPB	Positive	1	14-VDFN Exposed Pad	-40 °C	125 ¯C	Surface Mount	Buck	Step-Down	5 A	8 V	3.3 V	260 kHz	14-VSON (6x5)	1.81 mOhm
Texas Instruments LM2679T-3.3	Positive	1	TO-220-7 Formed Leads	-40 °C	125 ¯C	Through Hole	Buck	Step-Down	5 A	8 V	3.3 V	260 kHz	TO-220-7	1.81 mOhm
Texas Instruments LM2679S-12	Positive	1	D2PAK (7 Leads + Tab) TO-263-8 TO-263CA	-40 °C	125 ¯C	Surface Mount	Buck	Step-Down	5 A	8 V	12 V	260 kHz	TO-263 (DDPAK-7)	1.81 mOhm
Texas Instruments LM2679SX-3.3/NOPB	Positive	1	D2PAK (7 Leads + Tab) TO-263-8 TO-263CA	-40 °C	125 ¯C	Surface Mount	Buck	Step-Down	5 A	8 V	3.3 V	260 kHz	TO-263 (DDPAK-7)	1.81 mOhm
Texas Instruments LM2679SX-3.3	Positive	1	D2PAK (7 Leads + Tab) TO-263-8 TO-263CA	-40 °C	125 ¯C	Surface Mount	Buck	Step-Down	5 A	8 V	3.3 V	260 kHz	TO-263 (DDPAK-7)	1.81 mOhm
Texas Instruments LM2679SDX-3.3	Positive	1	14-VDFN Exposed Pad	-40 °C	125 ¯C	Surface Mount	Buck	Step-Down	5 A	8 V	3.3 V	260 kHz	14-VSON (5x6)	1.81 mOhm

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$

Digikey	Tape & Reel (TR)	2500	$ 3.32
Texas Instruments	LARGE T&R	1	$ 4.66
		100	$ 3.80
		250	$ 2.98
		1000	$ 2.53

Description

General part information

LM2679 Series

The LM2679 series of regulators are monolithic integrated circuits which provide all of the active functions for a step-down (buck) switching regulator capable of driving up to 5-A loads with excellent line and load regulation characteristics. High efficiency (>90%) is obtained through the use of a low ON-resistance DMOS power switch. The series consists of fixed output voltages of 3.3 V, 5 V, and 12 V and an adjustable output version.

The SIMPLE SWITCHER®concept provides for a complete design using a minimum number of external components. A high fixed frequency oscillator (260 kHz) allows the use of physically smaller sized components. A family of standard inductors for use with the LM2679 are available from several manufacturers to greatly simplify the design process.

Other features include the ability to reduce the input surge current at power on by adding a soft-start timing capacitor to gradually turn on the regulator. The LM2679 series also has built-in thermal shutdown and resistor programmable current limit of the power MOSFET switch to protect the device and load circuitry under fault conditions. The output voltage is specified to a ±2% tolerance. The clock frequency is controlled to within a ±11% tolerance.

Documents

Technical documentation and resources

LM2679SDX-3.3/NOPB

Deep-Dive with AI

LM2679SDX-3.3/NOPB

Deep-Dive with AI

Technical Specifications

LM2679 Series

Pricing

Description

LM2679 Series

Documents

Datasheet

DC/DC converter datasheets – System losses demystified

AN-1149 Layout Guidelines for Switching Power Supplies (Rev. C)

AN-2162 Simple Success With Conducted EMI From DC-DC Converters (Rev. C)

AN-1889 How to Measure the Loop Transfer Function of Power Supplies (Rev. A)

AN-1197 Selecting Inductors for Buck Converters (Rev. B)

AN-1520 A Guide to Board Layout for Best Thermal Resistance for Exposed Packages (Rev. B)

AN-1Positive-to-Negative Buck-Boost Converter Using LM267x SIMPLE SWITCHER (Rev. E)

DC/DC converter datasheets – System efficiency demystified

AN-1229 SIMPLE SWITCHER PCB Layout Guidelines (Rev. C)

AN-643 EMI/RFI Board Design (Rev. B)

Low EMI Layout Made SIMPLE With LM43600/1/2/3 and LM46000/1/2 (Rev. A)

Quantifying the value of wide VIN

AN-1135 LM267X 3A, 5A Evaluation Boards (Rev. D)

AN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A)

Semiconductor and IC Package Thermal Metrics (Rev. D)

AN-1246 Stresses in Wide Input DC-DC Converters (Rev. C)

Input and Output Capacitor Selection

Simple Techniques Minimize Cross-Coupling in Distributed Power Systems

AN-1566 Techniques for Thermal Analysis of Switching Power Supply Designs (Rev. A)

AN-1187 Leadless Leadframe Package (LLP) (Rev. R)

LM2679 Series