LM2676 Adjustable Step-Down Voltage Regulator

The LM2676 series of regulators are monolithic integrated circuits that provide all of the active functions for a step-down (buck) switching regulator capable of driving up to 3A  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 LM2676 is available from several
manufacturers to greatly simplify the design process. The LM2676 series 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 output voltage is guaranteed to a ±2% tolerance. The clock frequency is controlled to within a ±11% tolerance.

Features:-

•  Efficiency up to 94%.
•  Simple and easy to design with (using off-the-shelf external components).
•  150 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.
•  260 KHz 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.