Specification	LM2670S-3.3/NOPB

Current - Output	3 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	D2PAK (7 Leads + Tab), TO-263-8, TO-263CA
Supplier Device Package	TO-263 (DDPAK-7)
Synchronous Rectifier	False
Topology	Buck
Voltage - Input (Min) [Min]	8 V
Voltage - Output (Min/Fixed)	3.3 V

LM2670 Series

SIMPLE SWITCHER High Efficiency 3A Step-Down Voltage Regulator with Sync

Part	Output Configuration	Current - Output	Voltage - Output (Max)	Operating Temperature [Min]	Operating Temperature [Max]	Voltage - Input (Min) [Min]	Frequency - Switching	Supplier Device Package	Mounting Type	Output Type	Package / Case	Topology	Function	Number of Outputs	Voltage - Output (Min/Fixed)	Output Type
Texas Instruments LM2670SX-ADJ	Positive	3 A	37 V	-40 °C	125 ¯C	8 V	260 kHz	TO-263 (DDPAK-7)	Surface Mount	Adjustable	D2PAK (7 Leads + Tab) TO-263-8 TO-263CA	Buck	Step-Down	1	1.2 V
Texas Instruments LM2670SX-5.0	Positive	3 A		-40 °C	125 ¯C	8 V	260 kHz	TO-263 (DDPAK-7)	Surface Mount		D2PAK (7 Leads + Tab) TO-263-8 TO-263CA	Buck	Step-Down	1	5 V	1.81 mOhm
Texas Instruments LM2670SD-3.3	Positive	3 A		-40 °C	125 ¯C	8 V	260 kHz	14-VSON (5x6)	Surface Mount		14-VDFN Exposed Pad	Buck	Step-Down	1	3.3 V	1.81 mOhm
Texas Instruments LM2670S-ADJ	Positive	3 A	37 V	-40 °C	125 ¯C	8 V	260 kHz	TO-263 (DDPAK-7)	Surface Mount	Adjustable	D2PAK (7 Leads + Tab) TO-263-8 TO-263CA	Buck	Step-Down	1	1.2 V
Texas Instruments LM2670T-5.0/NOPB	Positive	3 A		-40 °C	125 ¯C	8 V	260 kHz	TO-220-7	Through Hole		TO-220-7 Formed Leads	Buck	Step-Down	1	5 V	1.81 mOhm
Texas Instruments LM2670SDX-ADJ/NOPB	Positive	3 A	37 V	-40 °C	125 ¯C	8 V	260 kHz	14-VSON (5x6)	Surface Mount	Adjustable	14-VDFN Exposed Pad	Buck	Step-Down	1	1.2 V
Texas Instruments LM2670T-ADJ	Positive	3 A	37 V	-40 °C	125 ¯C	8 V	260 kHz	TO-220-7	Through Hole	Adjustable	TO-220-7 Formed Leads	Buck	Step-Down	1	1.2 V
Texas Instruments LM2670T-5.0	Positive	3 A		-40 °C	125 ¯C	8 V	260 kHz	TO-220-7	Through Hole		TO-220-7 Formed Leads	Buck	Step-Down	1	5 V	1.81 mOhm
Texas Instruments LM2670SX-12	Positive	3 A		-40 °C	125 ¯C	8 V	260 kHz	TO-263 (DDPAK-7)	Surface Mount		D2PAK (7 Leads + Tab) TO-263-8 TO-263CA	Buck	Step-Down	1	12 V	1.81 mOhm
Texas Instruments LM2670S-3.3/NOPB	Positive	3 A		-40 °C	125 ¯C	8 V	260 kHz	TO-263 (DDPAK-7)	Surface Mount		D2PAK (7 Leads + Tab) TO-263-8 TO-263CA	Buck	Step-Down	1	3.3 V	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	Tube	1	$ 6.54
		10	$ 5.87
		45	$ 5.55
		135	$ 4.81
		270	$ 4.56
		540	$ 4.09
		1035	$ 3.45
		2520	$ 3.28
Newark	Each	1	$ 7.39
		10	$ 6.96
		25	$ 6.58
		90	$ 6.29
		135	$ 6.03
		270	$ 5.73
		540	$ 5.63
Texas Instruments	TUBE	1	$ 4.49
		100	$ 3.66
		250	$ 2.88
		1000	$ 2.44

Description

General part information

LM2670 Series

The LM2670 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 3-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 output version.

The SIMPLE SWITCHER®concept provides for a complete design using a minimum number of external components. The switching clock frequency can be provided by an internal fixed frequency oscillator (260 kHz) or from an externally provided clock in the range of 280 kHz to 400 kHz which allows the use of physically smaller sized components. A family of standard inductors for use with the LM2670 are available from several manufacturers to greatly simplify the design process. The external sync clock provides direct and precise control of the output ripple frequency for consistent filtering or frequency spectrum positioning.

The LM2670 series also has built-in thermal shutdown, current limiting and an ON/OFF control input that can power down the regulator to a low 50-µA quiescent current standby condition. The output voltage is ensured to a ±2% tolerance.

Documents

Technical documentation and resources

LM2670S-3.3/NOPB

Deep-Dive with AI

LM2670S-3.3/NOPB

Deep-Dive with AI

Technical Specifications

LM2670 Series

Pricing

Description

LM2670 Series

Documents

Product Change Notice EN

Semiconductor and IC Package Thermal Metrics (Rev. D)

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

Simple Techniques Minimize Cross-Coupling in Distributed Power Systems

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

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

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

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

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

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

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

Input and Output Capacitor Selection

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

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

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

LM2670 SIMPLE SWITCHER® High Efficiency 3-A Step-Down Voltage Regulator With Sync datasheet (Rev. K)

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

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

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