LM2678T-ADJ SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator

Part Number(s) (NSID)	Top View	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM2678S-12/NOPB LM2678S-12		TO-263	7	3 3	245 235	Detail	Download	N/A	NSUZXYTTE# LM2678 S-12
LM2678S-3.3/NOPB LM2678S-3.3		TO-263	7	3 3	245 235	Detail	Download	N/A	NSUZXYTTE# LM2678 S-3.3
LM2678S-5.0/NOPB LM2678S-5.0		TO-263	7	3 3	245 235	Detail	Download	N/A	NSUZXYTTE# LM2678 S-5.0
LM2678S-ADJ/NOPB LM2678S-ADJ		TO-263	7	3 3	245 235	Detail	Download	N/A	NSUZXYTTE# LM2678 S-ADJ
LM2678SD-12/NOPB LM2678SD-12		LLP	14	1 1	260 260	Detail	Download	N/A	NS UZXYTT S0003BB
LM2678SD-3.3/NOPB LM2678SD-3.3		LLP	14	1 1	260 260	Detail	Download	N/A	NS UZXYTT S0003CB
LM2678SD-5.0/NOPB LM2678SD-5.0		LLP	14	1 1	260 260	Detail	Download	N/A	NS UZXYTT S0003DB
LM2678SD-ADJ/NOPB LM2678SD-ADJ		LLP	14	1 1	260 260	Detail	Download	N/A	NS UZXYTT S0003EB
LM2678SDX-12		LLP	14	1	260	Detail	Download	N/A	NS UZXYTT S0003BB
LM2678SDX-3.3		LLP	14	1	260	Detail	Download	N/A	NS UZXYTT S0003CB
LM2678SDX-5.0/NOPB LM2678SDX-5.0		LLP	14	1 1	260 260	Detail	Download	N/A	NS UZXYTT S0003DB
LM2678SDX-ADJ/NOPB LM2678SDX-ADJ		LLP	14	1 1	260 260	Detail	Download	N/A	NS UZXYTT S0003EB
LM2678SX-12/NOPB		TO-263	7	3	245	Detail	Download	N/A	NSUZXYTTE# LM2678 S-12
LM2678SX-3.3/NOPB LM2678SX-3.3		TO-263	7	3 3	245 235	Detail	Download	N/A	NSUZXYTTE# LM2678 S-3.3
LM2678SX-5.0/NOPB LM2678SX-5.0		TO-263	7	3 3	245 235	Detail	Download	N/A	NSUZXYTTE# LM2678 S-5.0
LM2678SX-ADJ/NOPB LM2678SX-ADJ		TO-263	7	3 3	245 235	Detail	Download	N/A	NSUZXYTTE# LM2678 S-ADJ
LM2678T-12/NOPB LM2678T-12		TO-220	7	1 1	NA NA	Detail	Download	N/A	NSUZXYTTE# LM2678 T-12
LM2678T-3.3/NOPB LM2678T-3.3		TO-220	7	1 1	NA NA	Detail	Download	N/A	NSUZXYTTE# LM2678 T-3.3
LM2678T-5.0/NOPB LM2678T-5.0		TO-220	7	1 1	NA NA	Detail	Download	N/A	NSUZXYTTE# LM2678 T-5.0
LM2678T-ADJ/NOPB LM2678T-ADJ		TO-220	7	1 1	NA NA	Detail	Download	N/A	NSUZXYTTE# LM2678 T-ADJ

Description

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 5A 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 3.3V, 5V and 12V 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 (260KHz) 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¦ÌA quiescent current standby condition. The output voltage is guaranteed to a ¡À2% tolerance. The clock frequency is controlled to within a ¡À11% tolerance.

Applications

Diagrams

Typical Application	Block Diagram
Typical Performance   source£ºShenZhen henlito electronic co.,ltd. web:www.henlito.com