Product Summary

The LM2678S-ADJ is a High Efficiency 5A Step-Down Voltage Regulator. It provides 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. The LM2678S-ADJ also has built in thermal shutdown, current limiting and an ON/OFF control input that can power down the regulator to a low 50μA quiescent current standby condition. The applications of the LM2678S-ADJ are Simple to design, high efficiency (＞90%) step-down switching regulators, Efficient system pre-regulator for linear voltage regulators, Battery chargers.

Parametrics

LM2678S-ADJ absolute maximum ratings: (1)Input Supply Voltage:45V; (2)ON/OFF Pin Voltage:-0.1V to 6V; (3)Switch Voltage to Ground:-1V to VIN; (4)Boost Pin Voltage:VSW +8V; (5)Feedback Pin Voltage:-0.3V to 14V; (6)Power Dissipation:Internally Limited; (7)ESD:2 kV; (8)Storage Temperature Range:-65℃ to 150℃.

Features

LM2678S-ADJ features: (1)Efficiency up to 92%; (2)Simple and easy to design with (using off-the-shelf external components); (3)120 mΩ DMOS output switch; (4)3.3V, 5V and 12V fixed output and adjustable (1.2V to 37V) versions; (5)50μA standby current when switched OFF; (6)±2% maximum output tolerance over full line and load conditions; (7)Wide input voltage range: 8V to 40V; (8)260 KHz fixed frequency internal oscillator; (9)-40 to +125℃ operating junction temperature range.

Diagrams

LM2678S-ADJ pin configuration

Image Part No Mfg Description Data Sheet Download Pricing
(USD)		 Quantity
LM2678S-ADJ
LM2678S-ADJ
National Semiconductor (TI)
Switching Converters, Regulators & Controllers
Data Sheet
0-135: $3.29
135-270: $3.03
270-540: $2.76
540-1035: $2.32
LM2678S-ADJ/NOPB
LM2678S-ADJ/NOPB
National Semiconductor (TI)
Switching Converters, Regulators & Controllers HIGH EFF 5A STEP- DOWN VLTG REG
Data Sheet
0-1: $4.45
1-25: $3.65
25-100: $3.29
100-250: $3.03