Integrated Circuits (ICs)

LM2678SD-3.3

Obsolete

Texas Instruments

IC REG BUCK 3.3V 5A 14VSON

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Integrated Circuits (ICs)

LM2678SD-3.3

Obsolete

Texas Instruments

IC REG BUCK 3.3V 5A 14VSON

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DocumentsDatasheet

Specifications Series Pricing Description Documents

Technical Specifications

Parameters and characteristics for this part

Specification	LM2678SD-3.3

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 (5x6)
Synchronous Rectifier	False
Topology	Buck
Voltage - Input (Min) [Min]	8 V
Voltage - Output (Min/Fixed)	3.3 V

LM2678 Series

8V to 40V, 5A SIMPLE SWITCHER® buck converter with high efficiency

Part	Operating Temperature [Min]	Operating Temperature [Max]	Mounting Type	Frequency - Switching	Topology	Number of Outputs	Voltage - Input (Min) [Min]	Voltage - Output (Min/Fixed)	Current - Output	Function	Output Type	Package / Case	Output Configuration	Supplier Device Package	Voltage - Output (Max)	Output Type
Texas Instruments LM2678SDX-3.3/NOPB	-40 °C	125 ¯C	Surface Mount	260 kHz	Buck	1	8 V	3.3 V	5 A	Step-Down	1.81 mOhm	14-VDFN Exposed Pad	Positive	14-VSON (5x6)
Texas Instruments LM2678S-3.3	-40 °C	125 ¯C	Surface Mount	260 kHz	Buck	1	8 V	3.3 V	5 A	Step-Down	1.81 mOhm	D2PAK (7 Leads + Tab) TO-263-8 TO-263CA	Positive	TO-263 (DDPAK-7)
Texas Instruments LM2678T-12/NOPB	-40 °C	125 ¯C	Through Hole	260 kHz	Buck	1	15 V	12 V	5 A	Step-Down	1.81 mOhm	TO-220-7 Formed Leads	Positive	TO-220-7
Texas Instruments LM2678SX-ADJ/NOPB	-40 °C	125 ¯C	Surface Mount	260 kHz	Buck	1	8 V	1.21 V	5 A	Step-Down		D2PAK (7 Leads + Tab) TO-263-8 TO-263CA	Positive	TO-263 (DDPAK-7)	37 V	Adjustable
Texas Instruments LM2678T-ADJ	-40 °C	125 ¯C	Through Hole	260 kHz	Buck	1	8 V	1.21 V	5 A	Step-Down		TO-220-7 Formed Leads	Positive	TO-220-7	37 V	Adjustable
Texas Instruments LM2678T-ADJ/NOPB	-40 °C	125 ¯C	Through Hole	260 kHz	Buck	1	8 V	1.21 V	5 A	Step-Down		TO-220-7 Formed Leads	Positive	TO-220-7	37 V	Adjustable
Texas Instruments LM2678SDX-ADJ/NOPB	-40 °C	125 ¯C	Surface Mount	260 kHz	Buck	1	8 V	1.21 V	5 A	Step-Down		14-VDFN Exposed Pad	Positive	14-VSON (5x6)	37 V	Adjustable
Texas Instruments LM2678T-5.0	-40 °C	125 ¯C	Through Hole	260 kHz	Buck	1	8 V	5 V	5 A	Step-Down	1.81 mOhm	TO-220-7 Formed Leads	Positive	TO-220-7
Texas Instruments LM2678T-3.3	-40 °C	125 ¯C	Through Hole	260 kHz	Buck	1	8 V	3.3 V	5 A	Step-Down	1.81 mOhm	TO-220-7 Formed Leads	Positive	TO-220-7
Texas Instruments LM2678SD-3.3	-40 °C	125 ¯C	Surface Mount	260 kHz	Buck	1	8 V	3.3 V	5 A	Step-Down	1.81 mOhm	14-VDFN Exposed Pad	Positive	14-VSON (5x6)

Pricing

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

Distributor	Package	Quantity	$

Digikey	Cut Tape (CT)	1	$ 6.36
	Digi-Reel®	1	$ 6.36
	Tape & Reel (TR)	250	$ 4.44
		500	$ 3.98
		1250	$ 3.36
		2500	$ 3.19

Description

General part information

LM2678 Series

The LM2678 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 LM2678 are available from several manufacturers to greatly simplify the design process.

The LM2678 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. The clock frequency is controlled to within a ±11% tolerance.

Documents

Technical documentation and resources