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
