LM2678S-ADJ/NOPB

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Texas Instruments

8V TO 40V, 5A SIMPLE SWITCHER® BUCK CONVERTER WITH HIGH EFFICIENCY

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LM2678S-ADJ/NOPB

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Texas Instruments

8V TO 40V, 5A SIMPLE SWITCHER® BUCK CONVERTER WITH HIGH EFFICIENCY

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Description Specifications Series Pricing CAD Documents

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.

Technical Specifications

Parameters and characteristics for this part

Specification	LM2678S-ADJ/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	Adjustable
Package Leads	7 Leads
Package Name	TO-263 (DDPAK-7), D2PAK
Synchronous Rectifier	No
Topology	Buck
Voltage - Input (Max)	40 V
Voltage - Input (Min)	8 V
Voltage - Output (Max)	37 V
Voltage - Output (Min/Fixed)	1.21 V

LM2678 Series

Part	Voltage - Input (Max)	Synchronous Rectifier	Output Configuration	Operating Temperature (Max)	Operating Temperature (Min)	Number of Outputs	Function	Frequency - Switching	Output Type	Package / Case	Voltage - Output (Min/Fixed)	Package Width	Package Name	Package Length	Voltage - Input (Min)	Mounting Type	Current - Output	Topology	Package Leads	Voltage - Output (Max)
Texas Instruments LM2678SDX-3.3/NOPB	40 V	No	Positive	125 °C	-40 °C	1	Step-Down	260 kHz	Fixed	14-VDFN Exposed Pad	3.3 V	6 mm	14-VSON	5 mm	8 V	Surface Mount	5 A	Buck
Texas Instruments LM2678SX-3.3/NOPB	40 V	No	Positive	125 °C	-40 °C	1	Step-Down	260 kHz	Fixed		3.3 V		D2PAK TO-263 (DDPAK-7)		8 V	Surface Mount	5 A	Buck	7 Leads
Texas Instruments LM2678S-3.3	40 V	No	Positive	125 °C	-40 °C	1	Step-Down	260 kHz	Fixed		3.3 V		D2PAK DDPAK/TO-263-7 TO-263 (DDPAK-7)		8 V	Surface Mount	5 A	Buck	7 Leads
Texas Instruments LM2678T-12/NOPB	40 V	No	Positive	125 °C	-40 °C	1	Step-Down	260 kHz	Fixed	TO-220-7 Formed Leads	12 V		TO-220-7		15 V	Through Hole	5 A	Buck
Texas Instruments LM2678SX-ADJ/NOPB	40 V	No	Positive	125 °C	-40 °C	1	Step-Down	260 kHz	Adjustable		1.21 V		D2PAK TO-263 (DDPAK-7)		8 V	Surface Mount	5 A	Buck	7 Leads	37 V
Texas Instruments LM2678T-ADJ	40 V	No	Positive	125 °C	-40 °C	1	Step-Down	260 kHz	Adjustable	TO-220-7 Formed Leads	1.21 V		TO-220-7		8 V	Through Hole	5 A	Buck		37 V
Texas Instruments LM2678T-ADJ/NOPB	40 V	No	Positive	125 °C	-40 °C	1	Step-Down	260 kHz	Adjustable	TO-220-7 Formed Leads	1.21 V		TO-220-7		8 V	Through Hole	5 A	Buck		37 V
Texas Instruments LM2678SDX-ADJ/NOPB	40 V	No	Positive	125 °C	-40 °C	1	Step-Down	260 kHz	Adjustable	14-VDFN Exposed Pad	1.21 V	6 mm	14-VSON	5 mm	8 V	Surface Mount	5 A	Buck		37 V
Texas Instruments LM2678SX-12/NOPB	40 V	No	Positive	125 °C	-40 °C	1	Step-Down	260 kHz	Fixed		12 V		D2PAK TO-263 (DDPAK-7)		15 V	Surface Mount	5 A	Buck	7 Leads
Texas Instruments LM2678T-5.0	40 V	No	Positive	125 °C	-40 °C	1	Step-Down	260 kHz	Fixed	TO-220-7 Formed Leads	5 V		TO-220-7		8 V	Through Hole	5 A	Buck