LM2678S-12 Datasheet PDF - National

●General 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 characteris tics. 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.

●Features

●Efficiency up to 92%

●Simple and easy to design with (using off-the-shelf external components)

●120 mΩ DMOS output switch

●3.3V, 5V and 12V fixed output and adjustable (1.2V to 37V ) versions

●50µA standby current when switched OFF

●±2% maximum output tolerance over full line and load conditions

●Wide input voltage range: 8V to 40V

●260KHz fixed frequency internal oscillator

●−40 to +125˚C operating junction temperature range

●Applications

●Simple to design, high efficiency (>90%) step-down switching regulators

●Efficient system pre-regulator for linear voltage regulators

●Battery chargers