The LM2679 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 5-A 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 3.3 V, 5 V, and 12 V 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
(260 kHz) allows the use of physically smaller sized components. A family of standard
inductors for use with the LM2679 are available from several manufacturers to greatly simplify the
Other features include the ability to reduce the input surge current at power on by
adding a soft-start timing capacitor to gradually turn on the regulator. The LM2679 series also has
built-in thermal shutdown and resistor programmable current limit of the power MOSFET switch to
protect the device and load circuitry under fault conditions. The output voltage is specified to a
±2% tolerance. The clock frequency is controlled to within a ±11% tolerance.
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